For the velocity-time graph shown, which statement describes what happens to the velocity between approximately 24 s and 25 s?
A) The lander's velocity increases away from the reference.
B) The lander's velocity decreases toward the reference.
C) The lander's velocity decreases away from the reference.
D) The lander's velocity increases toward the reference.
The statement that describes what happens in the graph is option (B).
The lander's velocity decreases toward the reference.
What is velocity time graph?Velocity time graph is a type of graph that describes the change in velocity with respect to time of motion of an object.
Below is the basic explanation of the behavior of the average velocity of the particle with time.
initially at 10 seconds, the average velocity of the particle was constant.above 10 seconds, the average velocity of the particle increases with increase in time of motion.above 15 seconds, the increase in the average velocity with time decreased. between 20 and 25 seconds, there was a decrease in the average velocity from about - 5 m/s to about -15 m/s.Thus, we can conclude that between 20 and 25 seconds in the velocity tike graph, the average velocity of the object decreased towards the reference point (reference velocity = - 40 m/s.).
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particle a has a mass m and a speed v, while particle b has a mass 2m and a speed 2v. what is the ratio of the kinetic energy of particle b to the kinetic energy of particle a?
The ratio of the kinetic energy of particle b of mass 2m and a speed 2v to the kinetic energy of particle a of mass m and a speed v is 8 : 1
K = 1 / 2 m v²
K = Kinetic energy
m = Mass
v = Velocity
Let kinetic energy of particle a be K1 and kinetic energy of particle b be K2.
For particle a,
K1 = 1 / 2 m v²
For particle b,
m = 2m
v = 2v
K2 = 1 / 2 ( 2 m ) ( 2 v )²
K2 = 4 m v²
The ratio of the kinetic energy of particle b to the kinetic energy of particle a,
K2 / K1 = ( 4 m v² ) / ( 1 / 2 m v² )
K2 / K1 = 8 / 1
Therefore, the ratio of kinetic energy of particle b to the kinetic energy of particle a is 8 : 1
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the idling engines of a landing turbojet produce forward thrust when operating in a normal manner, but they can produce reverse thrust if the jet is properly deflected. suppose that while the aircraft rolls down the runway at 150 km/h the idling engine consumes air at 50 kg/s and produces an exhaust velocity of 150 m/s.
Forward thrust has positive values and reverse thrust has negative values.
Thrust is a sudden push or pull in a certain direction.
a)
Flight speed u = 150 km/h
1 km/h = [tex]\frac{1}{3.6}[/tex] km/s
therefore, 150 km/h = 41.67 km / s
The thrust force represents the horizontal or x-component of momentum equation:
[tex]T = m_{exhaust} * U_{exhaust} - U_{flight}[/tex]
T = 50 * (150 - 41.67)
T = 5416.67 N
Therefore, the value of forward thrust is 5416.67 N.
b)
Now the exhaust velocity is now vertical due to reverse thrust application, then it has a zero horizontal component,
thus thrust equation is:
[tex]T = m_{exhaust} * U_{exhaust} - U_{flight}[/tex]
T = 50 * (0 - 41.67)
T = -2083.5 N
Therefore, the thrust force T is -2083.5 N in the reverse direction.
c)
Now the exhaust velocity and flight velocity is zero, then it has a zero horizontal component, thus thrust is also zero because[tex]U_{exhaust} = U_{flight} = 0\\[/tex]
T = 0
Therefore, there is no difference in two velocities in x direction.
The given question is incomplete, the complete question is,
"The idling engines of a landing turbojet produce forward thrust when operating in a normal manner, but they can produce reverse thrust if the jet is properly deflected. Suppose that while the aircraft rolls down the runway at 150 km/h the idling engine consumes air at 50 kg/s and produces an exhaust velocity of 150 m/s.
a. What is the forward thrust of this engine?
b. What are the magnitude and direction (i.e., forward or reverse) if the exhaust is deflected 90 degree without affecting the mass flow?
c. What are the magnitude and direction of the thrust (forward or reverse) after the plane has come to a stop, with 90 degree exhaust deflection and an airflow of 40 kg/s?"
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a student sets up an experiment to determine the inertial mass of a cart. the student has access to the following measurement equipment: a spring scale, a meterstick, and a stopwatch. the student uses the spring scale to pull the cart starting from rest along a horizontal surface such that the reading on the spring scale is always constant. all frictional forces are negligible. in addition to the spring-scale reading, which two of the following quantities could the student measure with the available equipment and then use to determine the inertial mass of the cart? select two answers.
The youngster may calculate the total distance the cart has travelled using the metre rule by exerting a constant force.
He can calculate how long it took the cart to travel that distance using the stopwatch.
The equation of constant acceleration motion can be used to determine the acceleration of the cart during that motion if the distance travelled by the cart and the time it takes to travel that distance is known.
S = ut + 1/2at²
S = mileage travelled
a = the cart's acceleration, and
t represents the amount of time spent.
The formula for this law is F=ma, where F is the applied force, m is the object's inertial mass, and an is the object's acceleration.
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What is the pressure when 800N is applied to an area of 0.3m2 ?
Answer: [tex]2666.67 \text{ (or in 2 sigfigs, }2.7\times10^{3})[/tex]
Explanation: [tex]1\text{ }\dfrac{\text{N}}{\text{m}^2} = 1 \text{ Pa}\\\\P=\dfrac{F}{A}\\\\P=\dfrac{800\text{ N}}{0.3\text{ m}^2} = 2666.\overline6 \text{ N/m}^2 \approx 2666.67 \text{ Pa} \approx 2.7 \text{ kPa}[/tex]
Don't know if you need to convert to other units but typically in physics it's left as N/m^2 or Pa.
please help!! ill give brainlist its for my finals!
Give a real-world example of an energy transformation that uses two of the following forms of energy: chemical, mechanical, nuclear, gravitational, radiant, electrical, thermal (heat), and/or sound.
Answer:
candle for chemical energy.
Loudspeakers are the best example of electrical energy to sound energy conversion
Explanation:
two tugboats pull a disabled supertanker. each tug exerts a constant force of 2.20×106 n , one at an angle 19.0 ∘ west of north, and the other at an angle 19.0 ∘ east of north, as they pull the tanker a distance 0.890 km toward the north.
The amount of work the two tugboats completed on the supertanker W = 3.12 × 10^9 joules .
Work is a physics term used to describe the energy transfer that takes place when an object is moved over a distance by an external force, at least some . The component of the force acting along the path multiplied by the length of the path can be used to calculate work if the force is constant. Mathematically, this idea is expressed as W = fd, where W is the work and f is the force multiplied by d, the distance. Work is completed when the force is applied at an angle of with respect to the displacement. Performing work on a body involves moving it in its entirety from one location to another as well as other methods. However, the work is thought to be negative if the applied force is in opposition to the item's motion, indicating that energy is being pulled away from the object
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Consider the 636 N weight held by two cables shown below. The left-hand cable had tension T and makes an angle of θ with the wall. The right-hand cable had tension 890 N and makes an angle of 26◦ with the ceiling.
What is the angle θ which the left-hand cable makes with respect to the wall?
The angle θ which the left-hand cable makes with respect to the wall is 17⁰.
What is resultant force on the cables?The resultant force on the cables is determined by resolving the forces into x and y components as shown below.
y-component of the weight;
Wy = -636 N
y-component of the tension in the right cable;
Ty = 890 x sin(26)
Ty = 390.15 N
x-component of the tension in the right cable;
Tx = 890 x cos(26)
Tx = 799.93 N
y-component of the tension in the left cable;
Ty = T sinθ
x-component of the tension in the left cable;
Tx = -T cosθ
Sum of the forces in y-direction;
∑F_y = 0
T sinθ - 636 + 390.15 = 0
T sinθ - 245.85 = 0
T sinθ = 245.85 -------- (1)
Sum of the forces in x-direction;
∑Fx = 0
-T cosθ + 799.93 = 0
T cosθ = 799.93 -------- (2)
Divide equation (1) by (2)
T sinθ / T cosθ = 245.85/799.93
tanθ = 0.307
θ = arc tan(0.307)
θ = 17.1⁰ ≈ 17⁰
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Part A
Which yoga poses did you perform best? Which poses do you still need to improve on?
Answer:
Knees to Chest
Be consistent. Setting and committing to a regular practice of yoga is absolutely essential if you want to make improvements. ..
Answer: Dog pose was really easy, but tree pose was really difficult because it was hard to balance.
when rebuilding her car’s engine, a physics major must exert 240 n of force to insert a dry steel piston into a steel cylinder. what is the magnitude of the normal force between the piston and cylinder in newtons if the coefficient of kinetic friction between the piston and cylinder is 0.3?
If the coefficient of kinetic friction between two sliding surfaces is μ and the normal force between them is N, then the kinetic friction between them is given by μ = F/N . Therefore N= 800.
Given
kinetic friction μ = 0.3
and kinetic friction μ = F/N
N = normal force
where F = frictional force
F = 240 n
N = F/μ
= 240 n/0.3
N = 800 n
There are two types of friction kinetic friction, also known as dynamical friction, and static friction. A force acting in opposition to the direction of a moving body on the surface is felt. The two materials' coefficient of kinetic friction will determine how much force is applied. Kinetic friction occurs whenever two surfaces slide past one another. The application of brakes to tyres, the movement of an object across the ground, such as a box, or the rubbing of sandpaper all cause kinetic friction. The coefficient of friction, which measures the relationship between the frictional force and the normal force, provides a good description of friction. It obstructs the motion of several different items.
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# 14 If you have a tire blowout when driving on the highway, you should not use your brakes until...
If you have a tire blowout when driving on the highway, you should not use your brakes until the vehicle has nearly rolled to a stop.
If you have a tire blowout when driving on the highway, you should not use your brakes until the vehicle has nearly rolled to a stop because at high speed the deviation is more.
Rolling is a type of motion that combines rotation and translation of that object with respect to a surface, such that, if ideal conditions exist, the two are in contact with each other without sliding. Rolling where there is no sliding is referred to as pure rolling.
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A 0.10kg mass is oscillating at a small angle from a light string with a period of 0.63s. What is the length of the pendulum?
Answer: 00.99m
Explanation:
because
Answer: 0.099
Explanation: Khan
What is the right option for this question?
(Question is attached below)
Use the simulation to complete the activity.
Force and Motion Basics (select Acceleration)
In one or two sentences, make a hypothesis about whether or not it is easier to start the box moving than to keep it moving on a rough surface. Then, explain how the simulation can be used to prove the hypothesis.
It is more difficult to get the object to move or keep moving on a rough surface.
What is friction?The term friction has to do with the opposition to the motion of an object. We know that friction could lead to a reduction in the speed of the object. If the surface is so rough, the motion an object would be difficult due to a greater resistive force that keeps the object from moving.
We can then see that it would be more difficult for the object to begin to move on the rough surface rather, motion could easily start and be sustained on quite a smooth surface as we can see.
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On a rough surface, it is more challenging to move or maintain the motion of the object due to friction between the object and the surface due to contact.
What is force?An object experiences a push or pull as a result of interacting with another object. Each object is subject to a force whenever two objects interact.
According to newton's law, an object tries to maintain its position whether it is at resting or it is in motion. If the body is at rest then it tries to maintain its rest position and if the body is in motion then again it tries to maintain its motion. So, if the box is at rest, it is difficult to move the box in starting because of inertia, but once it is in motion it is easy to keep on going with the flow.
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after struggling to solve a physics problem, you take a break for lunch. when you go back to work on the problem, the solution suddenly pops into your head. in this case you used to solve the problem.
You used insight in this situation to find a solution to which you struggling to solve.
On the three aspects of process, task, and phenomenology, there are various definitions of insight (Llinger and Knoblich, 2009). Process is concerned with the cognitive processes that result in clever answers. An analytical process emphasises a deliberate and systematic evaluation of the problem, emphasising logical deduction and strategic thinking, as opposed to descriptions of insightful problem solving processes that emphasise a sudden certainty of a correct response with little to no conscious access to the processing of the solution. It is widely recognised that it is difficult to measure a subjective experience like insight objectively (Llinger and Knoblich, 2009; Ash et al., 2009). In the past, researchers have made use of "classic insight problems," vague issues that Gestalt psychologists first utilised to induce feelings of insight upon realising the solution.
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As you drive, a passenger in your car records your speed at 10-second intervals. The passenger records the following data: {(0 s, 18 m/s), (10.0 s, 18 m/s), (20.0 s, 18 m/s),
(30.0 s, 18 m/s), (40.0 s, 18 m/s)}. Using a graph of the velocity as a function of time, determine your displacement between t = 10.0 s and t = 35.0 s.
The velocity as a function of time is 0, and displacement between t = 10.0 s and t = 35.0 s is 0.
How to find velocity and displacement?The vector quantity velocity (v), denoted by the equation v = s/t, quantifies displacement (or change in position, s), over change in time (t).
as S= 0, then
[tex]V_{total}[/tex] = [tex]\frac{ Final Speed - initial speed}{total_time }[/tex]
V=0.
Displacement is defined as the final position minus the starting position.
Displacement = Final distance- initial distance
S= 0
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the altitude of a satellite in an elliptical orbit around the earth is 2000 km at apogee and 500 km at perigee. determine a) the eccentricity of the orbit; b) the orbital speeds at perigee and apogee(km/s); and c) the period of the orbit(minutes).
a) The eccentricity of the orbit is 1.086. b) The orbital speeds at perigee and apogee is 5088 km/s. c) The period of the orbit is 8.516 minutes.
As a property, velocity is used to describe the characteristics of moving objects. It is the amount of movement of an object over a reasonably long period of time.
The satellite orbits the planet in an elliptical pattern. The semi-major axis and eccentricity of an elliptical orbit can be used to identify it.
The apogee distance (the distance between the satellite and the center of the Earth) and the perigee distance (the distance between the satellite and the edge of the planet) are, respectively, R a =R E +d a =6.3710 6 m+36010 3 m=6.7310 6 m.
R p = R E + d p =6.37 10 6 m + 180 10 3 m =6.55 10 6 m
R a =a(1+e) and R p =a(1e) are the relationships between the apogee and perigee distances and eccentricity e, respectively.
E is so little that the orbit is almost round.
The orbit would be a long, thin ellipse, on the other hand, if e is close to unity.
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a train slows down as it rounds a sharp horizontal turn, going from 90.0 km/h to 50.0 km/h in the 15.0 s it takes to round the bend. the radius of the curve is 150 m. compute the acceleration at the moment the train speed reaches 50.0 km/h. assume the train continues to slow down at this time at the same rate
The acceleration at the moment the train speed reaches 50.0 km/h is -0.74 m/s².
What is acceleration of an object?
The acceleration of an object is the change in the velocity of the object with time.
a = Δv/Δt
where;
Δv is change in velocity of the objectΔt is change in time of motion of the objecta = (vf - vi) / t
where;
vf is the final velocity of the train = 50 km/h = 13.89 m/svi is the initial velocity of the train = 90 km/h = 25 m/sSubstitute the given parameters and solve for the acceleration of the train.
a = (13.89 m/s - 25 m/s) / (15 s)
a = -0.74 m/s²
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COLOR BY NUMBER
NET FORCE
Date:
Per:
ī
Directions: Answer each question by circling the correct choice. After you have completed all of the
questions, color the picture using the assigned colors.
Question
Choice A
1. The sum of all forces acting on an
object is known as...
2. Which of the following is a
characteristic of a balanced force?
3. Which of the following is a
characteristic of an unbalanced force?
4. Which of the following represents
balanced forces?
5. Which of the following represents
unbalanced forces?
6.
7.
8.
9.
10.
10N
14
7N
7N
[orange]
Directions: Calculate the net force in the questions below.
120N
16N
3N 7
4N
4N
5N
14N
5N
50N
7N
applied force
[purple]
equal in size,
opposite in direction
[red]
equal in size,
opposite in direction
[sky blue]
7N
7N
12N to the left
[orange]
A) ON [red]
B) 7N, right
[purple]
7N
125N to the right
[green]
C) 28N, right
[green]
C) 2N, left
[blue]
[purple]
A) 2N, right
[red]
3N₁
7N to the left
[red-orange]
B) 12N, right
[purple]
Name:
Choice B
net force
[black]
causes a change
in the direction
of an object
[sky blue]
does not cause a
change in the motion
of an object
[green]
11N
[sky blue]
5N
[purple]
11N
SN
11N to the left
[yellow]
125N to the left
[sky blue]
21N to the right
[orange]
A) 45N, right [brown]
B) 35N, right [orange]
C) 40N, right [yellow]
B) Dog B [yellow]
C) Dog C[green]
Choice C
normal force
[green]
causes a change
in the motion of
an object
[orangel
causes a change
in the motion of
an object
[purple]
8N
4N
[orange]
2N 2N
[yellow]
21N to the left
[blue]
170N to the right
[pink]
11. Two students kick a soccer ball at the same time.
Student A kicks the ball with a force of 80N to the
right. Student B kicks the ball with a force of 45N to
the left. Calculate the net force.
1N to the left
[yellow-green
12. Three dogs are pulling on a stuffed animal. Dog
A pulls with a force of 150N to the north. Dog B pulls
with a force of 150N to the south. Dog C (a much
smaller dog) is pulling to the east with a force of
40N. Which dog will win the toy?
A) Dog A [red-orange]
Morpho Science
The net force exists 0 when the forces are in equilibrium. They have the same impact as if there were no forces at all.
What is meant by Net Force?Net Force, which is essentially the total of all the forces operating on an item, is the combination or consequence of those forces.
The total of all forces exerted on an object is known as the net force. A mass can accelerate due to net force. A body is subject to another force whether it is at rest or in motion. When there exists a lot of forces acting on a system, the term "net force" exists employed.
Equal in size and directed in the opposite direction, balanced forces are. When forces are evenly distributed, motion remains unchanged. One of your scenarios from the previous section involved pushing or pulling an object with the equal amount of force in opposite directions.
The complete question is:
Directions: Answer each question by circling the correct choice. After you have completed all of the questions, color the picture using the assigned colors.
Question
Choice A
1. The sum of all forces acting on an object is known as...
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while taking off from an aircraft carrier, a jet starting from rest accelerates uniformly to a final speed of 40. meters per second on a runway that is 70. meters long. what is the magnitude of the acceleration of the jet?
11.4m/s^2 is the magnitude of the acceleration of the jet while taking off from an aircraft carrier, a jet starting from rest accelerates uniformly to a final speed of 40. meters per second.
[tex]v^2-u^2=2as[/tex] in this
v = final velocity
u =initial velocity
a = acceleration
s =displacement
the data, we have got
u = 0 (it starts from rest)
v = 40 m/s (final velocity)
s = 70 m ( run-way length)
now, put in the equation
[tex]a=v-u/t=(40^2-0)/2(70)=11.4m/s^2[/tex]
When a point or object accelerates or decelerates, it is moving straight forward. Motion on a circle increases despite the same speed because the direction is always changing. All other movements accelerate as a result of these factors.
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a 0.11 kgkg steel ball is tied to the end of a string and then whirled in a vertical circle at a constant speed vv . the length of the string is 0.62 mm , and the tension in the string when the ball is at the top of the circle is 4.0 nn . what is vv ?
The speed of the ball during centripetal motion is 4.75 m/s.
We need to know about centripetal force to solve this problem. When an object moves in a circular motion, the object is experiencing centripetal force. The magnitude of centripetal force is
Fc = m . v²/R
where Fc is the centripetal force, m is mass, v is velocity and R is the radius.
From the question, we know that
m = 0.11 kg
F = 4 N
R = 0.62 m
The tension in the string is equal to centripetal force
T = Fc
4 = m . v²/R
4 = 0.11 . v² / 0.62
v² = 22.55
v = 4.75 m/s
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as additional resistors are connected in parallel to a constant voltage source, how is the power supplied by the source affected? as additional resistors are connected in parallel to a constant voltage source, how is the power supplied by the source affected? the effect on the power supplied by the source cannot be determined without knowing the voltage of the source. the power supplied by the source increases. the power supplied by the source decreases. the power supplied by the sources remains constant.
The equivalent resistance of a circuit reduces as more parallel resistors are added, but the circuit's overall current increases. Additional branches via which charge can flow are comparable to more resistors being added in parallel.
A circuit can have parallel or series connections connecting two or more electrical components. The circuit is referred to as a parallel circuit when all of the devices are linked utilizing parallel connections. Each device is located in a distinct branch of a parallel circuit. Branch lines indicate that there are numerous paths for charge to move via the external circuit.
A single resistor located in a single branch will be contacted by each charge moving through the external circuit's loop. A charge choose which branch it will take on its way back to the low potential terminal when it reaches the branching site or node.
It was made clear that increasing the number of resistors in a parallel circuit has the very surprising effect of reducing the total resistance. The addition of a second resistor in a different branch creates a second avenue for charge to travel through the circuit's primary area of resistance because there are numerous ways for it to do so.
By increasing the number of branches, the resistance will reduce, which will increase the pace at which charge flows (also known as the current).
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A 1500 kg car travels around a circular track at a constant speed. a) If the radius of the path is 200 m and the car is traveling at 45 m/s, how long does it take the car to do a lap around the track? b) What net force is acting on the car in the horizontal direction? c). What force keeps the car in a circular path? d). What is the coefficient of static friction between the car’s tires and the road?
a) The time taken is 4.44 s
b) The force that keeps it moving is 15188 N
c) The centripetal force is responsible for the motion in the circular path.
d) The coefficient of the friction is 1.03
What is the centripetal force?The centripetal force is the force that keep the object moving in a circular path. In this case, we need to find the how long does it take the car to do a lap around the track.
a) The time that is taken is the radio of the distance to the speed of the object. Thus the time that is taken = 200 m/45 m/s = 4.44 s
b) The net force that acts on the car as it is negotiating the circular path is given as; mv^2/r = 1500 * (45)^2/200
= 15188 N
c) The centripetal force keeps the car on the circular path
d) The coefficient of static friction is; 15188 N/1500 kg * 9.8 m/s^2
= 1.033
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A piston contain oxygen at 280k occupying a volume of 0.25m^3.the cylinder is compressed adiabtically to 0.14m^3 find the increase in tempratur of the gas
The gas's internal energy rises by 250 J when the value is positive. So, the increase in temperature of the gas is 250 J.
Any device addressing the relationship between heat and work must be designed with a working knowledge of thermodynamics. This method ignores actions that take place at the molecular level in favor of considering a particular amount of matter.
In macroscopic thermodynamics, the effects are based on observable, quantifiable quantities, and the attributes of the system are given to the system as a whole.
Work cannot "store" energy like the aforementioned forms can. It is merely a momentary manifestation process of energy transmission. Heat cannot transport energy either; it is merely a temporary manifestation process. Therefore, other types of energies in transition include heat and work.
by setting a limit, identifies the subject of the manifestation analysis. Either "a distinct collection of substance" or "a region in space" must be handled consistently.
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A ship sails due North at a speed of 20 m/s. A current in the water begins to move from East to
West. The speed of this current is 20 m/s.
What is the magnitude of the resultant velocity of the ship?
A- 28m/s
B- 40m/s
C- 0m/s
D- 20m/s
Answer:
Explanation:
Given:
V₁ = 20 m/s
V₂ = 20 m/s
____________
V - ?
V = √ (V₁² + V₂²) = √ ( 20² + 20²) = 20·√2 ≈ 28 m/s
The magnitude of the resultant velocity of the ship is 40m/s. The correct option is B.
What is velocity?The rate of change of displacement is known as velocity. The rate at which velocity changes is called acceleration.
Due to the fact that it includes both magnitude and direction, velocity is a vector quantity. As the rate at which velocity changes, acceleration is likewise a vector quantity.
The directional speed of an item in motion, as measured by a specific unit of time and observed from a certain point of reference, is what is referred to as velocity.
Here, it is given that,
Initial velocity = 20m/s
Final velocity = -20m/s, as current in the water begins to move from East to West.
We know that,
ΔV = Initial velocity - Final velocity
ΔV = 20 - (-20)
ΔV = 20+20
ΔV = 40m/s
Thus, the correct option is B.
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an unwary football player collides with a padded goalpost while running at a velocity of 5.10 m/s and comes to a full stop after compressing the padding and his body 0.600 m. (a) what is his acceleration (in m/s2)? (assume the initial direction of motion is the positive direction. indicate the direction with the sign of your answer.)
The acceleration of an unwary football player during uniform motion is 21.675 m/s² with a positive direction.
We need to know about the uniform motion to solve this problem. The uniform motion is an object's motion under acceleration. It should follow the rule
vt = vo + a . t
vt² = vo² + 2a . s
s = vo . t + 1/2 . a . t²
where vt is final velocity, vo is initial velocity, a is acceleration, t is time and s is displacement.
From the question above, we know that
vo = 5.1 m/s
s = 0.6 m
vt = 0 m/s
By substituting the given parameters, we can calculate the acceleration
vt² = vo² + 2a . s
0² = 5.1² + 2a . 0.6
1.2a = - 26.01
a = 21.675 m/s²
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an electric-powered snow-thrower machine throws snowballs 0.3 kg each at a speed of 7 m/s . the machine throws 2 snowballs per second. what is the average electric power consumption of such a machine? consider that its efficiency is 50 % .
The average electric power consumption of a machine is 29.4 watt.
What is Kinetic Energy?
Kinetic Energy is defined as the object which has because of its motion.
It is represented as
K = 1/2 mv²
where,
K = Kinetic Energy
m = mass
V = Velocity
Now by putting the value we get the kinetic energy as
K = 1/2 mv²
= 0.5 × 0.3 × (7)²
= 7.35 J
It is given in the question that the machine throws 2 snowballs per second.
Poutput = 2 × 7.35
= 14.7 J/s
= 14.7 watt
According to the question the efficiency is given as 50%. So average electric power is
Avg. Electric power = 2 × 14.7
= 29.4 watt
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(a) is it possible for the magnetic force on a charge moving in a magnetic field to be zero? (b) is it possible for the electric force on a charge moving in an electric field to be zero? (c) is it possible for the resultant of the electric and magnetic forces on a charge moving simultaneously through both fields to be zero?
a)It is possible for the magnetic force on a charge moving in a magnetic field to be zero. The force acting on the charge is zero when a charge is moving in the same or opposite direction of the magnetic field. When a is charge moving parallel in the same direction of the magnetic field, then the magnetic force is zero.
b)It is not possible for the electric force on a charge moving in an electric field to be zero. If there's a charged particle in a magnetic field, it's impossible for this force to become zero.
c)It is not possible for the resultant of the electric and magnetic forces on a charge moving simultaneously through both fields to be zero. The magnetic force can be zero but the electric force cannot be zero because it is not affected by the motion of the particles.
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65 POINTS PLEASE HELP NEED ASAP
A truck is pulling an 85-kg rock attached by a rope. The coefficient of friction between the rock and the ground is 0.32. The truck applies 295 N of force to the rock. Determine the net force and the acceleration.
Answer:
23.6
Explanation:
The net force applied on the truck is 267.8 N.
The acceleration of the truck is 3.15 m/s².
What is force?The definition of force in physics is: The push or pull on a massed object changes its velocity.
An external force is an agent that has the power to alter the resting or moving condition of a body. It has a direction and a magnitude.
A spring balance can be used to calculate the Force. The Newton is the SI unit of force.
Given parameters:
Force applied on the truck: F = 295 N.
Mass of the trick: m = 85 kg.
Weight of the truck: W = mg = 85 kg × 10 m/s² = 850 N.
The coefficient of friction between the rock and the ground is μ = 0.32.
Frictional resistance force applied on the truck: f = μ N = μW
= 0.32×85 N
= 27.2 N.
Hence, net force applied on the truck = F - f = 295 N - 27.2 N = 267.8 N.
Hence, acceleration of the truck is = 267.8 N/85 kg = 3.15 m/s².
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in what direction are the vibrations in a transverse wave relative to the direction of wave travel? what about in a longitudinal wave?
A transverse wave is a wave in which particles of the medium move in a direction perpendicular to the direction that the wave moves. and in a longitudinal wave particles are displaced parallel to the wave direction.
In a transverse wave, the displacement of the individual medium particles occurs in a direction that is perpendicular to the wave's direction of propagation. Imagine holding a slinky and moving your hand up and down, and the slinky follows. However, the actual wave itself travels from left to right.
Transverse waves are created when a medium's particle oscillations are perpendicular to the wave's direction of propagation. An ocean wave is a typical illustration of a transverse wave. The direction of the water molecules' motion in an ocean wave is vertical.
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