The potential energy of the coin is mathematically given as
P.E=26.99949J
Potential energy of coinQuestion Parameters:
A circus performer walks a tightrope 315 m above the ground.
(m = 0.015 kg) have when its speed is 60.0m/s
Generally the equation for the Newtons equation is mathematically given as
v 2 - u 2 =2aS
Therefore
S = [ v 2 - u2 ] / 2a
S = [ 60-0 ] / 2*9.8
S= 183.67 m
Therefore,P.E
P.E=mgh
hence
P.E=0.015*9.8*183.67
P.E=26.99949J
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the 20 kg at angle of 53⁰ in an inclined plane is realsed from rest the coefficient of friction bn the block and the inclined plane are ųs=0.3 and ųk=0.2
A) would the block move
B) if it moves what is its speed after it has descended a distance of 5m down the plane
Given :-
A 20kg block at an angle 53⁰ in an inclined plane is released from rest .[tex]\mu_s = 0.3 \ \& \ \mu_k = 0.2[/tex]To Find :-
Would the block move ?If it moves what is its speed after it has descended a distance of 5m down the plane .Solution :-
For figure refer to attachment .
So the block will move if the angle of the inclined plane is greater than the angle of repose . We can find it as ,
[tex]\longrightarrow \theta_{repose}= tan^{-1}(\mu_s)[/tex]
Substitute ,
[tex] \longrightarrow \theta_{repose}= tan^{-1}( 0.2)[/tex]
Solve ,
[tex]\longrightarrow\underline{\underline{\theta_{repose}= 16.6^o }}[/tex]
Hence ,
[tex]\longrightarrow\theta_{plane}>\theta_{repose}[/tex]
Hence the block will slide down .
Now assuming that block is released from the reset , it's initial velocity will be 0m/s .
And the net force will be ,
[tex]\longrightarrow F_n = mgsin53^o - \mu_k N [/tex]
Substitute, N = mgcos53⁰ ( see attachment)
[tex] \longrightarrow ma_n = mgsin53^o - \mu_k mgcos53^o [/tex]
Take m as common,
[tex] \longrightarrow\cancel{m }(a_n) = \cancel{m}( gsin53^o - \mu gcos53^o)[/tex]
Simplify ,
[tex] \longrightarrow a_n = gsin53^o - \mu_k g cos53^o[/tex]
Substitute the values of sin , cos and g ,
[tex] \longrightarrow a_n = 10( 0.79 - 0.2 (0.6)) [/tex]
Simplify ,
[tex] \longrightarrow a_n = 10 ( 0.79 - 0.12 ) \\\\ \longrightarrow a_n = 10 (0.67)\\\\ \longrightarrow \underline{\underline{a_n = 6.7 m/s^2}}[/tex]
Now using the Third equation of motion namely,
[tex] \longrightarrow2as = v^2-u^2[/tex]
Substituting the respective values,
[tex] \longrightarrow2(6.7)(5) = v^2-(0)^2 [/tex]
Simplify and solve for v ,
[tex] \longrightarrow v^2 = 67 m/s\\\\\longrightarrow v =\sqrt{67} m/s \\\\\longrightarrow\underline{\underline{ v = 8.18 m/s }} [/tex]
Hence the velocity after covering 5m is 8.18 m/s .
Explain how your car's inertia affects how quickly it starts up from rest or comes
to a stop
Inertia is the tendency of an object to stay in the current state. Hence, the stationary car has a tendency to continue in the state of rest. Quick starts up will make it move backward or if stop quickly while moving, it goes forward.
What is inertia ?According to Newton's first law of motion, an objects tends to continue in its state of motion or rest until an external force acting on it. This tendency of the objects is called inertia.
The impacts of inertia can be well explained based on on real life examples. If we might had the experience of moving to front in a vehicle which suddenly breakes. It is the tendency of the vehicle to stay in motion.
Similarly the car when started from rest initially tends to stay at rest and that's why we feel it moves back ward. Similarly the car will move forward when it is suddenly stops.
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Can an object have a speed of zero while it has an acceleration that is not
zero?
What is the working principle of thermometer?
A car accelerates at a rate of 3.0
m/s2 after stopping at a red light. If
the mass of the car is 3000 kg, what
force does its engine exert?
The force of the car's engine exerts is 6000 N.
To find the force, the given values are,
acceleration, a = 3 m/s².
mass = 3000 kg
What is Newton's second law?Newton's second law is a quantitative description of the changes that a force can produce on the motion of a body. According to Newton's second law of motion, the acceleration of a body is directly proportional to the force acting on the body and inversely proportional to its mass. The formula for the Newton's second law isAcceleration, a = Force F/ Mass m
From which we get the formula
Force F = Mass m × Acceleration a
Where, mass is kg and acceleration is m/s².
The unit of force is kgm/s² or N.where kg is kilogram-meter per second square or Newton.
Substituting the Equation in:
F = ma
= 3000kg x 2m/s²
= 6000kgm/s²
F = 6000 N.
So, the Force of the car engine exerted is 6000 N.
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Why does the moon turn red during a lunar eclipse?.
Answer:
The moon is turning red because being that the moon doesn't have any light of it's own, the Earth moves between the Sun and the moon, disrupting the light supply for the Moon.
How much acceleration will an object with a mass of 1,525 kg have if a force of 200 N is applied? Show
your work for full credit.
Answer:7.625m/s2
Explanation: M=1525
N=200
F=M*a
200=1525*a
a=1525/200
a=7.625m/s2
Globally, the winter of 2014–15 was the warmest winter on record at that time, but it sure didn’t seem that way for most of the eastern United States. This region experienced record-low temperatures and extreme snowfall, especially in the northern and coastal areas. During this period of extreme cold and snow, it was not uncommon to see comments on social media disputing climate change. For example, some commenters took pictures of huge piles of snow and added comments such as, "This doesn’t look like global warming."
Do these commenters have a point? Should extreme snowfall over the course of a season cast doubt on the theory of global climate change? Make a scientific argument explaining why you agree or disagree with these commenters.
Answer:
I need help on this to omg
Explanation:
Which has more momentum: a 20,000 kg cement truck traveling at 5 m/s or a 1000 kg race car traveling at 90 m/s
Hi there!
Recall the equation for momentum:
[tex]\large\boxed{p = mv}[/tex]
p = linear momentum (kgm/s)
m = mass (kg)
v = velocity (m/s)
We can calculate each object's momentum and compare.
Cement truck:
[tex]p = 20000 \cdot 5 = 100000kg\frac{m}{s}[/tex]
Race car:
[tex]p = 1000 \cdot 90 = 90000 kg\frac{m}{s}}[/tex]
Since 100,000 > 90,000, the cement truck has the greater momentum.
Calculate the minimum height that 7.0 kg of water must fall to gain 1300 J of kinetic energy.
Explanation:
K=mgh\\1300=(7)(9.8)h\\h=19\ mK=mgh
1300=(7)(9.8)h
h=19 m
Object A mass a mass of 5 kg. Object B has a mass of 8 kg. If a force of 100 N is applied to each object, identify which object will accelerate the most and which will accelerate the least.
True or false. A separation technique that can be used for this investigation is centrifugation.
•If the car and truck collided, which
direction would the two cars move. Be
sure to explain your answer in terms of
momentum.
Answer:
The cars would both move in the direction with the greatest momentum. We know the truck would have the greatest momentum due to having the greatest mass. Plus, factors which affects momentum are mass and velocity.
Thus, the car would move forward towards the direction of momentum of the truck. Both will continue to move at the same velocity.
E.g. truck hits the back of a stationary car, both will move forward, to the right & travelling at the same speed, but lower than the initial velocity of the truck. Now the total the total momentum before the collision is the same as the total momentum after the collision; as a result, momentum has been conserved.
Hope this helps!
How do greenhouse gasses help warm the planet?
Answer:
Greenhouse gases include carbon dioxide, methane, nitrous oxide and other gases that accumulate in the atmosphere and create the heat-reflective layer that keeps the Earth at a livable temperature. These gases form the insulation that keeps the planet warm enough to support life.
answer asp. What happens when you place ice in a hot cup of water? will give brainliest
Answer:
When you add ice to hot water, the ice melts and the hot water cools
Explanation:
When ice is poured in a hot cup of water, the ice melts and then mixes with the hot water cooling and lowering the temperature. The weight increases when ice added. process occurring: ice melting to liquid.
Which is the correct scientific notation of the number 0.0006817
Answer:
6.817 x 10^-4
Explanation:
You first need to put the decimal between the ones and tenths (6.8), then you count back to the original decimal point. If you are counting to the left then its going to be a negative exponent but if you count towards the right, it'll be a positive exponent. So from 6.817 to 0.0006817, it is 4 places back. Thats how you get the answer. Hope this helps a bit
Answer:
6.817 x 10^-4
Explanation:
First move the decimal between the ones and tenths (6.8), then count back to the original decimal point if you are counting to the left then its going to be a negative exponent but if you count towards the right it'll be a positive exponent. From 6.817 to 0.0006817, it is 4 places back, nd this is how you get the answer.
If the sum of all the forces acting on a car is zero, then the speed of the car?
Answer: If all forces acting on a car are zero, than the cars speed is zero since there are no forces to push or pull the car :)
Explanation:
The conductor is initially electrically neutral, and then a charge +q is placed at the center of the hollow space. Suppose the conductor initially has a net charge of +9q instead of being neutral. What is the total charge on the interior and on the exterior surface when the +q charge is placed at the center? Please explain the answer as well..
Hi there!
If a +q charge is placed in the center of a hollow conductor, a charge of -q will be induced in the interior of the shell.
Thus, with the conservation of charge:
[tex]q_{outer} + q_{inner} = q_{total}\\\\q_{outer} - q = 9q[/tex]
Solve for the outer charge:
[tex]q_{outer} = q + 9q = 10q[/tex]
Therefore, the INTERIOR has charge -q and EXTERIOR has charge 10q.
Introduction for Home economics project
Answer:
study of everything that helps to improve the home and the family
Explanation:
Answer:
➢ Home economics, or family and consumer sciences, is a subject concerning human development, personal and family finance, housing and interior design, food science and preparation, nutrition and wellness, textiles and apparel, and consumer issues.
Explanation:
I hope it will help you....
#carryonleraning
Select the correct answer. Which term describes the ability to repay debt? A. capacity B. creditworthiness C. capability
Answer:
the answer is capacity
Explanation:
A nurse counts 76 heartbeats in one minute.
How many heartbeats would occur in 30 seconds?
Answer:
38
Explanation:
76 divided by 2 =38
A lower ramp will be longer, allowing for less force to be used, but makes an object travel a greater distance.
True or false??
Answer: READ WHOLE THING ***
A ramp is an example of an inclined plane. Think back to the example of the ramp and the moving truck. The ramp reduced the amount of force needed to lift the box by moving it over a greater distance. The longer an inclined plane, the less force is required to move an object upward.
Hope this helps :)
True, a lower ramp will be longer, allowing for less force to be used, but makes an object travel a greater distance.
What is potential energy?The energy possessed by a body due to its position.The higher the object from earth's surface the higher potential energy it will have.Thus , if we want to throw any object in sky far away , we have to apply more force.Similarly , if the ramp will be longer , then it will consume less force to move an object over it so the object will travel a greater distance.Therefore , a lower ramp will be longer, allowing for less force to be used, but makes an object travel a greater distance.
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what would happen to the temperature on mercury during the day if a sunspot was directly in line with it's surface?
Answer:
mind-bogglingly hot
Explanation:
If a sunspot were pointed right at Mercury in this way, the planet would become even more mind-bogglingly hot. Sunspots look dark in our visual spectrum, so we might suspect that they are colder (or at least less hot) than the rest of the Sun; but in fact, they are hotter.
An object experiences a certain net force that causes a certain acceleration. If the net force on the object is
tripled, what happens to the acceleration of the object?
Answer:
it increases
Explanation:
equal to opposite force so it would return the amount applied on it
If an object experiences a certain net force that causes a certain acceleration. If the net force on the object is tripled , then the acceleration of the object would become tripled as well assuming the mass of the object is constant.
What is Newton's second law ?Newton's Second Law states that The resultant force acting on an object is proportional to the rate of change of momentum.
As given in the problem if an object experiences a certain net force that causes a certain acceleration. If the net force on the object is
tripled,
If a specific net force acting on an item results in a specific acceleration. Assuming the mass of the item remains constant if the net force acting on it is tripled, the acceleration of the object would also be tripled.
Thus, the acceleration of the object would get tripled.
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A periodic wave has a wavelength of 2m and has a speed of 45 m/s what is the frequency
Answer:
f = 22.5 Hz
Explanation:
speed of wave = v
frequency = f
wave length = l
v = lf → f = v/l → f = 45/2 → f = 22.5 Hz
In practice, it will take longer than a electric kettle to boil the water in a normal kettle. Explain why.
Please answer correctly..
Please help !!
Will give the brainliest !!!
Explanation:
electric kettle works so quickly is by using a relatively large electric current.
The amount of heat produced is proportional to the current squared,
so bigger currents produce much more
heat—and heat things much more
quickly—than smaller ones.
Water in an electric kettle boils much faster when compared to normal kettle mainly because of two reasons :-
(•) In normal kettle, heat is supplied directly onto the kettle's base. As it is cold in nature, it takes time for the kettle base to be heated and then only the heat passes through water.
On the other hand, in electric kettle, the electric current wave passes directly through the water, hence it takes less time to heat the water.
(•) Water is a good absorber of electric current, but is a poor absorber of heat. Consider if it takes 2 minutes for electric to pass through water, then it will take 9 minutes for the heat to pass through water.
It is due to these major reasons to why water boils faster in electric kettle than in normal kettle.
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If you have any doubts regarding the answer, feel free to ask it in comments !
Hope this answer's your query ...
What is the relationship between the shock wave of an explosion and sound?
Aluminum can be made into foil because aluminum has high?
Answer:
Aluminum can be made into foil because aluminum has high ductile.
Explanation:
Answer:
Because it is highly ductile
A certain lever has a mechanical advantage of 5.5 how heavy of a load could the lever lift with an input force of 20.0 N
Answer:110N
Explanation:
ma=f in/ f out (formula)
Input: 20.0N
Ma:5.5
Output:?
^ given information
Plug the numbers into the equation ~
5.5= 20N/?
5.5x20=110N
If a certain lever has a mechanical advantage of 5.5, then the leaver would be able to lift a load of 110 Newtons with an input force of 20.0 N
What is the mechanical advantage?Mechanical advantage is defined as a measure of the ratio of output force to input force in a system, It is used to analyze the forces in simple machines like levers and pulleys.
Mechanical advantage = output force(load) /input force (effort)
As given in the problem a certain lever has a mechanical advantage of 5.5, then we have to find out how heavy of a load could the lever lift with an input force of 20.0 N,
Mechanical advantage = output force(load) /input force (effort)
5.5 = load / 20.0 Newtons
load = 5.5 × 20
= 110 Newtons
Thus, the leaver would be able to lift a load of 110 Newtons with an input force of 20.0 N
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One piece of evidence that can help astronomers sort out how the planets in our solar system formed is
Answer:
[tex]\huge\boxed{\sf Circumstellar\ discs }[/tex]
Explanation:
Astronomers discovered matter made up of gas, dust or asteroids etc. around nearby stars. This matter is called circumstellar disc (due to it being ring-shaped). These circumstellar discs are materials out of which planets form.
Circumstellar discs are one piece of evidence that can help astronomers sort out how the planets in our solar system were formed.[tex]\rule[225]{225}{2}[/tex]
Hope this helped!
~AH1807