10^3 watt is the power of the heater,
power=work done/time
work done= mcΔt
m=1 kg
c=4.2 x 103 Jkg-¹ C-¹
Δt=75°C
work done= mcΔt
work done=1 x 4.2 x 10^3x 75
work done=3.15x10^5 joule
power=work done/time
power=3.15x10^5 joule/315 s
power= 10^3 watt
power is produced when a force causes a displacement. There is no connection between power and the amount of time this force takes to cause a displacement. The process's speed might range from being finished quickly to taking some time. For example, it takes an abnormally long time for a rock climber to elevate her body a few meters over the cliff's edge. A trail hiker, on the other hand, may swiftly lift her body a few meters if she selects the faster path up the mountain. Even though the two people put in the same amount of power , the hiker finishes the assignment far faster than the rock climber.
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the relative velocity of two cars is 50m/s when they move in opposite direction and 10m/s when they move in same direction. what is the speed of each car
The speed of the each of the car moving in the same direction with a relative velocity of 50 m/s is 30 m/s and 20 m/s respectively.
What is relative velocity?The relative velocity is defined as the velocity of an object with respect to another observer.
For both cars moving in the opposite direction,
R = Va+Vb.............. Equation 1Where:
R = Relative velocityVa = Velocity of the first carVb = Velocity of the second carFrom the question,
Given:
R = 50 m/sSubstitute into equation 1
50 = Va+Vb................ Equation 2Also, for both cars traveling in the same direction
R = Va-Vb.............. Equation 3Given:
R = 10 m/sSubstitute into equation 3
10 = Va-Vb............ Equation 4Solve equation 2 and 4 simultaneously,
Adding equation 2 and equation 4
50+10 = Va+Va+Vb-Vb60 = 2VaVa = 60/2Va = 30 m/sSubstituting the value of Va into equation 1
50 = 30+VbVb = 50-30Vb = 20 m/sHence, the speed of each car is 30 m/s and 20 m/s respectively.
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In addition to starch, plants also convert glucose into cellulose. Cellulose is used
to support and strengthen plants. Animals do not have cellulose for support.
Instead, animals have something else to provide support and protect the body.
Do you remember what this is?
Additionally, the conversion of glucose results in the creation of other chemical components that support the growth and reproduction of the plant.
What is Cellulose?A polysaccharide or complicated carbohydrate with at least 3,000 glucose molecules per gram, cellulose. The most prevalent of all naturally occurring organic substances, cellulose is the basic structural element of plant cell walls and compensates around 33% of all vegetable matter.
Despite not being able to be digested by humans, cellulose is a food supply for grazing animals because they can keep this in their digestive tracts long enough even for protozoans, which are found in the guts of insects like termite, to digest it.
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Explain how each of the three types of energy transfer occurs in the oven as the soup is cooked.
The three types of energy transfer occurs in the oven as the soup is cooked is mentioned above.
There are three types of thermal energy transfer. They are:
ConductionConvectionRadiationConduction is the heat transfer through physical touch. Convection is the heat transfer between fluid objects. Radiation is the transfer of heat energy by means of waves.
When the soup is cooked in the oven,
Conduction - When heat is transferred from utensil to soupConvection - When heat is transferred from lower layer of soup to other layers of soup Radiation - The oven provided heat energy by means of radiationTherefore, the three types of energy transfer occurs in the oven as the soup is cooked is mentioned above.
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satellites in near-earth orbit experience a very slight drag due to the extremely thin upper atmosphere. these satellites slowly but surely spiral inward, where they finally burn up as they reach the thicker lower levels of the atmosphere. the radius decreases so slowly that you can consider the satellite to have a circular orbit at all times.
Because it spirals inward, it slowly decreases its orbital radius. So so long as a satellite acts in a round orbit, it's velocity is inversely proportionate.
A satellite or synthetic satellite tv for pc is an object deliberately positioned into orbit in outer area. besides for passive satellites, most satellites have an energy technology system for device on board, including solar panels or radioisotope thermoelectric generators.
A satellite is a moon, planet or machine that orbits a planet or star. for example, Earth is a satellite because it orbits the sun. Likewise, the moon is a satellite tv for pc as it orbits Earth. commonly, the word satellite refers to a device this is released into space and movements around Earth or another frame in area.
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An amusement park ride goes a circle at 10m/s. If its centripetal acceleration is 5m/s^2, then how big is the radius of the circle?
The radius of the circle is equal to 20m if the centripetal acceleration is 5m/s².
What is centripetal acceleration?The centripetal force is perpendicular to the velocity in a circular motion. If the particles change their speeds in a circular motion then acceleration is produced and the acceleration from directing toward the center.
The mathematical Formula for the centripetal acceleration used:
a = v²/r
Where 'r' is the radius of the circle and a is the centripetal acceleration.
Given, the velocity of the ride, v = 10 m/s
The centripetal acceleration, a = 5 m/s²
The radius of the circle in which the ride is going on is :
r = v²/a
r = (10)²/5
r = 20 m
Therefore, the radius of the circle is equal to 20m.
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A cart has a net horizontal force acting on it to the right Jon says taht it must be moving to the right. jonne says no, it could be moving in either direction. Are either of these two correct? If so, explained and described the velocity and acceleration if any of the cart
Since the net force acts towards the right, the object would move towards the right and the acceleration would also be towards the right.
What is the net force?The term net force has to do with the actual force that acts on a body. We know that a force is a vector quantity and that a system of forces could act on an object.
When more than one force is acting on an object, it then follows that the object would remain at rest or in a state of uniform motion if the forces are balanced.
If the forces are not balanced, the object would move in the direction of the net force that acts on the body.
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What is the density of an object that has a mass of 30 kg and a volume of 0.5 m³?
The density of the object will be 60 kg/m³.
Density of any object is a derived quantity as it is obtained from mass and volume. But, it is not a derived unit. So, it is not a derived unit of measure.
Density of a substance is a physical intensive property. It can not be considered as an chemical property. We can measure the density of a substance without changing of its chemical composition or identities.
Density of a substance gives the idea whether the substance will sink or float. If the density of a substance is more as compared to the liquid, then it will sink. Otherwise it will float.
Density of an object is given by mass/volume.
Here,
mass = 30 kg
Volume = 0.5 m³
Density = 30/0.5 = 60 kg/m³
Therefore the density of an object having mass of 30 kg and volume of 0.5 m³ is given as 60 kg/m³.
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If you have an 18 Ohm light bulb connected to a 9. 0 V cell, what i the current in the circuit?
The current in the circuit is 0.5 A
what is current?
An electrical charge carrier flow known as current often involves electrons or atoms lacking in electrons. The capital letter I is a typical way to represent current.
I = V/R
I = 9/18
I = 0.5 A
Therefore, the current in the circuit is 0.5
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The circuit's current is 0.5 A.
What is current?
An electric current is a flow of charged particles, such as electrons or ions, across a conductor or space. It is calculated as the net rate of charge flow through a surface or into a control volume. Charge carriers are moving particles that can be one of numerous sorts depending on the conductor. Electrons flowing over a wire are frequently used as charge carriers in electric circuits. They can be either electrons or holes in semiconductors. Ions are the charge carriers in an electrolyte, whereas ions and electrons are the charge carriers in plasma, an ionised gas.
I = V/R
I = 9/18
I = 0.5 A
Therefore, the current in the circuit is 0.5
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a glider of mass 4.0 kg is placed on a horizontal air track and connected by a light, inextensible string over a frictionless pulley to a hanging 1.0 kg mass, both starting from rest. how long does it take the 1.0 kg mass to fall 1.0 m? (take g
It will take the 1.0 kg mass to fall 1.0 m is about 3.83seconds.
What does physics define as a force?The push or pull on a massed object alters its velocity, which is the definition of force. An agent with the ability to change a body's resting or moving state is known as an external force. It has a magnitude and a direction.
Finding the force the rope in this situation applied to the 3 kg weight should be our first step.
Weight of 4kg mass = 4×9.8 = 39.2
Weight of 1kg mass = 1×9.8 = 9.8
The force acting upward on the 4kg mass will equal the weight of the 1kg mass. Thus the resultant force acting on the 4kg mass is:
Total force = 39.2 - 9.8 = 29.4 N (upwards)
Now find the acceleration:
F = m×a
29.4= 1×a
a = 29.4m/s²
We now apply the motion equation shown below to determine how long it takes to move one meter:
s = u × t + 1/2(a × t²)
1 = 0 × t +1/2(29.4 × t²)
t = 3.83seconds.
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What are the two key observational facts that led to widespread acceptance of the big bang model?.
The two key pieces of evidence that support the Big Bang theory are the cosmic background radiation and the observed helium content of the universe.
What is the Big Bang?
The big bang explains the way the universe began. It states that the universe began as just a single point, then expanded and stretched to grow as large as it is right now. The term “Big Bang” was coined by the British astronomer Fred Hoyle in 1949. Around 13.7 billion years ago, everything condensed in an infinitesimally small singularity, a point of infinite denseness and heat. Cosmic microwave background is the electromagnetic radiation which fills the universe that is a residual effect of the big bang 13.8 billion years ago.
The presence of hydrogen and helium helps scientists to universal expansion rate.
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you are the first astronaut to land on planet x. unfortunately you packed light, so all you have available is a pendulum (a mass attached to a string), as well as a stopwatch and a ruler. explain how you would measure the acceleration due to gravity on planet x.
Acceleration due to gravity states that when an object falls freely towards the surface of earth from a certain height, then there is a change in velocity which produces acceleration in the object which is known as acceleration due to gravity denoted by g.
The value of acceleration due to gravity is. g=9. 8m/s2.
How do you measure Acceleration due to gravity on planet X?
The given is a planet " X "The light is packedA pendulum is available with attached massa ruler is there like a metre scale and a stopwatchNeed to find the acceleration due to gravity on planet " X "Using equation T = 2 \pi ( L / g )1/2 T2 = 4 \pi2 ( L / g )g = 4 \pi2 L / T2 ------------------- 1Here we have a pendulum so using ruler we can measure the length = L and using pendulum's SHM trials count by stopwatch we can get time period " T " as whole we have here two quantities like L and T
Substituting in equation " 1 " we can find the gravity of the planet " X ".
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The height of the empire tate building i 318. 00 meter. If a tone i dropped from the top of the building ,what i the tone' velocity jut before it trike the ground?
Use the equation v = v0 + gt = 0 + 9.80665 * 8 to find the final free fall speed (right before impact with the ground), which is 78.45 m/s.
To determine the velocity at impact, multiply the time by the acceleration caused by gravity. If the object hits the ground after 9.9 seconds, its velocity is
=(1.01 s)*(9.8 m/s2),
=9.9 m/s.
Initial velocity plus two times the acceleration times the distance equals final velocity. V is the speed right before collision. Initial velocity, or u, is 0 mph.
Gravity's acceleration, a, is 9.81 m/s/s.
Therefore, from the moment the projectile is thrown, through its highest point, and until just before it hits the ground, its acceleration is equal to the acceleration caused by gravity, or 9.81 meters per second per second.
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if the race car has wings which increase the downward force by 4000 n, what is the maximum braking force?
The maximum braking force that can be applied to the car having a mass of 500kg is 8820 N
F= μN ( μ= Coefficient of static friction and N= max normal reaction of the car)
= 1.8 X 500g= 1.8 X 500 X 9.8= 8820 N
Alternatively known as brake power, the braking force describes the total amount of force applied to a moving body that causes it to slow down or come to a stop. Breaking force is the minimum force, expressed in pounds, at which a chain, wire cable, webbing strap, or end device breaks when a continuously increasing force is applied to it. For this force to be calculated correctly, the vehicle's body must be moving at a known, constant speed. If the car's wheels are still turning while it is braking, static friction is at work; however, if the wheels are locked and sliding over the road, kinetic friction is at work. The breaking stress or ultimate tensile stress is the highest amount of stress a material can withstand before breaking.
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If Usain Bolt runs at a speed of 12 m/s for 100 seconds, how far did Usain Bolt run in meters
The distance covered by Usain Bolt in meters is 1200 meter.
Speed is defined as the distance travelled or covered in a particular time period. Speed is a scalar quantity as it does not specify the direction of motion, whereas velocity is the vector counterpart of speed as velocity specifies the direction of motion of the object or body or anything concerned with the motion.
Speed is given by the equation,
speed= distance traveled/time taken --- equation(1)
so we can calculate distance from equation(1) as ,
distance traveled= speed × time taken --- equation(2)
here,
speed is given as 12 m/s and time taken is given as 100 seconds
Therefore from equation(2)
distance traveled = 12m/s×100s=1200m
that is , the distance covered by Usain Bolt is 1200 meters.
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Can someone help me out here please
Students in a physical science class are measuring the velocity of a model car. Their data is shown in the table.
Based on the data table, what would the acceleration be at 3. 5 seconds?
The acceleration of the car at 3.5 seconds is determined as 10 m/s².
option (D) is the correct answer.
What is the acceleration of the car?The acceleration of the car is the change in velocity of the car with time.
Mathematically, acceleration is given as;
a = Δv/Δt
where;
Δv is the change in velocity of the carΔt is change in time of motion of the cara = (v - u) / (t₂ - t₁)
where;
v is the final velocityu is the initial velocityt₁ is the initial timet₂ is the final timea = (15 - 5) / (1.5 - 0.5)
a = 10 m/s²
The acceleration of the car at 3.5 seconds can be calculated by applying extrapolation method as shown below;
a = (v - u) / (t₂ - t₁)
where;
v is the final velocity at 3.5 seconds = 35 m/su is the initial velocity at 1.5 seconds = 15 m/st₁ is the initial time = 1.5 secondst₂ is the final time = 3.5 secondsa = (35 - 15) / (3.5 - 1.5)
a = (20) / (2)
a = 10 m/s²
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A cessna 172 plane that is used to transport up to four VIPs in 2km in the air. If the potential energy of the VIP plane with three VIP onboard is 800 J, what is the combined massof the cessna and passanger
The combined mass of the cessna plane and the passangers, with a potential energy of 800 J is 0.041 kg.
What is mass?Mass can be defined as the quantity of matter a body contains.
To calculate the combined mass of the cessna plane and passangers, we use the formula below
Formula:
P.E = Mgh......... Equation 1Where:
P.E = Potetial energy M = Combined mass of the cessna plane and the passangersg = Acceleration due to gravityh = Height.Make M the subject of the equation
M = P.E/gh............. Equation 2From the question,
Given:
P.E = 800 Jh = 2 km = 2000 mg = 9.8 m/s²Substitute these values into equation 2
M = (800)/(200×9.8)M = 0.041 kgHence, the combined mass of the cessna plane and the passangers is 0.041 kg.
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particle a and particle b, each of mass m, move along the x-axis exerting a force on each other. the potential energy of the system of two particles associated with the force is given by the equation u
The speed and direction of motion of particle B is 2v₀/3 m/s towards left.
Potential energy is stored electricity that relies upon the relative function of various elements of a device. Spring has more capacity energy when it's miles compressed or stretched. A metallic ball has greater potential energy raised above the ground than it has after falling to Earth.
Potential energy is the electricity held by using an object due to its function relative to other objects, stresses within itself, its electric-powered charge, or different factors.
K.E₁ + P.E₁ = K.E₂ + P.E₂
1/2Mv² + G/r² = 1/2Mv² + G/r²
1/2Mv² = 1/2mv²
v² = v²
Va = Vb
V = 2v₀/3 m/s towards left.
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Disclaimer:- your question is incomplete, please see below for the complete question.
Particle A and particle B, each of mass M, move along the x-axis exerting a force on each other. The potential energy of the system of two particles associated with the force is given by the equation U=G/r 2, where r is the distance between the two particles and G is a positive constant. The speed and direction of motion of particle B is?
A charming friend of yours who has been reading a little bit about astronomy accompanies you to the campus observatory and asks to see the kind of star that our sun will ultimately become, long, long after it has turned into a white dwarf. Why is the astronomer on duty going to have a bit of a problem satisfying her request?.
The astronomer on duty going to have a bit of a problem satisfying your astronomy reading friend's request because it becomes too cold and dark to emit visible light.
Long after a star turns into a white dwarf, it will become too cold due to no fusion of atoms happening in its core to provide any energy. The light emitted initially is due to the hotness before the fusion has stopped to take place.
The hotness eventually cools off due to surrounding temperature. As the temperature reduces the light emitted will also decrease. After it fully becomes cold it will stop emitting light and so it cannot be seen.
Therefore, the astronomer on duty going to have a bit of a problem satisfying your astronomy reading friend's request because it becomes too cold and dark to emit visible light.
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In a classic experiment, a ball (ball 1) is dropped from a specific height. At the same time, an identical ball (ball 2) is launched horizontally from the same height. Which ball hits the ground first?.
Answer:
Explanation:
The answer to the question related to the time for two balls to reach the ground is option C, the two balls will reach the ground at the same time because the horizontal and vertical planes of motion are independent of each other, and they are also released from the same height.
When a ball is dropped, knowing the height we could find the time with the following equation:
(1)
Where:
: is the final height
: is the initial height
: is the initial speed of the ball in the vertical direction = 0 (it is dropped)
g: is the acceleration due to gravity
When the ball is launched horizontally from the same height, we could find the time with equation (1) since the acceleration in the horizontal direction is zero and the initial velocity in the vertical direction is also zero.
The horizontal motion is related to the equation:
(2)
We can notice in both cases that the ball is accelerated only by gravity.
Let's evaluate each statement
A) This statement is incorrect because the path is the same for both cases. The ball is dropped and launched from the same height.
B) This statement is also incorrect. The velocity of the dropped ball is the same as the velocity of the launched ball because the ball is accelerated only by gravity.
C) This statement is correct. We can see that we would get the same time in equation (1) since , , and is the same for the dropped ball and the launched ball.
D) This statement is incorrect. The nature of motion is related to a freefall motion in both cases.
Therefore, the answer is option C.
how could you generate a larger emf with the bar magnet? 2. you should have observed that the voltage peaked in one direction for moving the magnet in and peaked in the other direction for moving the magnet out. why is this? 3. by inducing positive and negative voltage peaks in your coil, determine the
To generate a larger emf with the bar magnet one should move the magnet faster through the coil and add more turns to the coil.
What is Emf?An energy transfer to an electric circuit per unit of electric charge, expressed in volts, is known as electromotive force in electromagnetism and electronics. Electrical transducers are devices that create an emf by transforming non-electrical energy into electrical energy.
What is a Bar magnet?A rectangular section of an object with permanent magnetic qualities that is formed of ferromagnetic material is known as a bar magnet.
A shift in magnetic flux is an induced EMF's most fundamental cause. Placing a coil that is constantly moving and conducting current in a magnetic field that is static and stable. EMF will be produced as a result of the area vector changing as a result of this.
You should have observed that the voltage peaked in one direction for moving the magnet in hand peaked in the other direction for moving the magnet out this is because according to Faraday's Law, a voltage is produced in a coil of wire when a magnet is moved inside of it, altering the magnetic field and magnetic flux through the coil. The galvanometer deflects to the left in the example below as the magnet is moved inside the coil in response to the growing field.
Hence, To generate a larger emf with the bar magnet one should move the magnet faster through the coil and add more turns to the coil.
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Fill in the blank question.
Your sibling drops your house keys down to you from the second-floor window, as shown in the image. What is the velocity of the keys when you catch them?
If a steady magnetic field exerts a force on a moving charge, that force is directed.
The force exerted by a magnetic field on a moving charge is called the Lorentz force. It is directed perpendicular to both the velocity of the charge and the magnetic field.
The magnitude of the force is given by the equation:
F = qvB
Where:
F is the magnitude of the force (N)
q is the charge of the particle (C)
v is the velocity of the particle (m/s)
B is the strength of the magnetic field (T)
The force acts to deflect the charge from its path. The amount of deflection depends on the strength of the magnetic field and the velocity of the charge. If the magnetic field is strong, the charge will be deflected more. If the velocity is high, the charge will be deflected more.
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The lower the ph value the larger the concentration of hydrogen ions
The lower the ph value the larger the concentration of hydrogen ions.
What is ph value?In chemistry, pH, historically denoting "potential of hydrogen", is a scale used to specify the acidity or basicity of an aqueous solution. Acidic solutions are measured to have lower pH values than basic or alkaline solutions.
A pH of 7 is neutral. A decrease in pH below 7 shows an increase in acidity (hydrogen ions), while an increase in pH above 7 shows an increase in alkalinity (hydroxyl ions). Each pH unit represents a 10-fold change in concentration.
The lower the ph value the larger the concentration of hydrogen ions.
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based on coulomb's law of electrostatic attraction of oppositely-charged species, which of the following chlorine-containing compounds would be predicted to have the greatest (most exothermic) lattice energy? group of answer choices
The Correct option is (c) .
NaCl , has the largest (most exothermic) lattice energy by applying Coulomb's law.
Using Columbus' law of electrostatics, we have
F = q₁× q₂ / r²
where F ---> attraction between oppositely charged particles
lattice energy: strength of bond between oppositely charged ions , depends on the distance between the centers of ions when they are packed into a crystal, and the bond strength can be determined by the lattice energy.
We need to know how the lattice energy is affected by the properties of the ions. The increase in lattice energy is two properties we usually focus on. As the ion charge increases, the lattice energy increases. Reducing the size of the ions increases the lattice energy. As the ion becomes smaller, the lattice energy increases. They are all ions. Cations have the same charge as all other cations. We can see the size of the ion. The smallest cation is the one Sodiam from other cations.
Hence, NaCl have largest lattice energy.
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Complete Question
Based on Coulomb's Law of electrostatic attraction of oppositely- charged species, which of the following chlorine-containing compounds would be predicted to have the greatest (most exothernic) lattice energy? a)KCI
b)CaCl₂
c) NaCl
d)MgCl₂
a plano-convex lens is formed of one plane surface and one convex surface. the convex surface has radius |75cm|. the lens is formed of a material with index of refraction 1.6. what is the focal length of the lens?
The focal length of the lens is 100 cm.
What is focal length?Focal length ( f ) is the distance from the lens or mirror to the focal point ( F ). This is the distance from the lens or mirror that parallel rays meet. Focal length of concave lens, convex lens and concave mirror.The focal length of a lens is the distance between the lens and the image sensor when the subject is in focus, usually expressed in millimeters.For zoom lenses, both minimum and maximum focal lengths are specified (e.g. 18-55 mm). For a thin lens in air, the focal length is the distance from the center of the lens to the prime focus (or focal point) of the lens.For a converging lens (such as a convex lens), the focal length is positive and is the distance at which a parallel beam of light is focused to a single point.To learn more about focal length from the given link:
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in the process of delivering mail, a postal worker walks 161 m, due east from his truck. he then turns around and walks 194 m, due west from his truck. what is the worker's displacement relative to his truck?
33 m, due west, is the worker's displacement from his truck.
The meaning of displacementThe state of being displaced: the action or process of displacing. a storm that forced thousands of people to evacuate. Physics: the volume and weight of a fluid, such as water, that is moved by a floating object, such as a ship, of equivalent weight (see move sense 2a).
What else can displacement be called?Replace, supersede, & supplant are some typical synonyms for the word "displace." Displace indicates an ousting and dislodging even if all of these terms imply "to put out of a customary or proper place and into the position of another." Thousands had been displaced by war.
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the process of the blood flow as it enters the heart until it leaves the heart 150 words
A clerk at a hardware store performed the activities in the list.
Activities
1. Pushed a 300 N box for 5 m across a floor using 110 N of force
2. Lifted a 490 N box of tools from the floor to a shelf 1.5 m high
3. Held a 50 N clay pot for 4 minutes for a customer while the customer did more
shopping
Which statement best describes the amount of work performed for the three activities?
O Activity 1 was the only activity that required work.
O Activity 2 required the most work.
O Activity 1 required the same amount of work as Activity 3.
Activity 3 required more work than Activity 1, but Activity 3 did not require more work than Activity 2.
Activity 1 and Activity 3 both needed extra work than Activity 2, while Activity 3 did not.
What is a job?When an object is displaced over a distance by such an external force, at least a portion of that force must be supplied in the directions of a displacement. This is known as work in physics. The quantity of force required to move a thing a specific distance is referred to as the work done.
Which three forms of job are there?Three categories can be used to classify the type of labor performed. Positive work, negative work, and zero work are the three types. The angle among force and displacement determines the kind of work that is done. Positive work occurs when a force is applied and an object is moved in that direction.
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a 1140-kg van, stopped at a traffic light, is hit directly in the rear by a 745-kg car traveling with a velocity of 1.77 m/s. assume that the transmission of the van is in neutral, the brakes are not being applied, and the collision is elastic. what is the final velocity of (a) the car and (b) the van?
Applying the conservation of momentum law we find the final velocity of
a) the car = 0.37 m/s in the opposite direction.
b) the van = 1.39 m/s
Define elastic collision between particles?
An elastic collision is defined as the collision which when happens between bodies there is no net loss of kinetic energy in the system. In elastic collisions, both kinetic energy and momentum of the bodies are conserved.The given informations in the question are-
Mass of van = mv = 1140 kg
Mass of car = mc = 745 kg
Initial velocity of car = v1_i = 2.25 m/s
Applying conservation of momentum, the final velocity of the car is found out using the formula,
v1_f = (mc - mv) x v1_i / (mc + mv)
Putting the values we get,
v1_f = (745 - 1140) x 1.77 / (745 + 1140)
= - 395 x 1.77 / 1885
= - 0.37 m/s
The negative sign indicates that after collision it is moving in the opposite direction to its initial speed.
The final velocity of the van, is found out using the formula,
v2_f = 2 x mc x v1_i / (mv +mc)
Putting the values we get,
v2_f = 2 x 745 x 1.77 / (745 + 1140)
= 1.39 m/s
Hence, the final velocity of
a) the car = 0.37 m/s in the opposite direction.
b) the van = 1.39 m/s
To learn more about elastic collision from the given link
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point p is 5 cm above the wire as you look straight down at it. in which direction is the magnetic field at p?
Answer:
If you wrap your right hand around the wire with your thumb in the direction of the conventional current (+ to -), your fingers will point in the direction of the magnetic field.
Note - The conventional current goes from a battery's plus terminal to its negative terminal in the external circuit. (the actual direction of the electrons travel from - to + in the external circuit)