48 Answered Questions for the topic kinetic energy


Average Kinetic Energy of 2 Objects

If I had 2 objects of equal mass ( 10kg for example ), and knew that the average speed of the 2 objects was 8 ms-1 , is it possible to calculate the average kinetic energy of the 2 objects. I... more


A 3.0 kg mass body has an initial velocity v0 = (6.0 i - 2.0 j) m/s.

(a) What is the initial kinetic energy? (b) Determine the value of the final kinetic energy if its velocity changes to v0 = (8.0 i + 4.0 j)?


what is the kinetic energy

What is the kinetic energy of a girl with mass of 40kg running steadily at a speed of 5ms


speed of the ball

A machine throws tennis balls contains a spring with a spring constant of 145N/m. When you push a ball into the machine,the spring compresses by 1.5cm.The mass of the ball is 55g  Calculate the... more


what is kinetic energy

i want to know more about kinetic and potential energy  


A mass of 10 grams and velocity of 9 centimeters per second has a kinetic energy of _____ergs.

Kinetic energy varies jointly as the mass and the square of the velocity. A mass of 15 grams and velocity of 7 centimeters per second has a kinetic energy of 147 ergs. Find the kinetic energy for a... more


Can you help me with this answer?

A particle with mass m = 1.67 x 10 -27 kg is being accelerated along a straight line at 3.6 x 10 15m/s 2 . If the particle has initial speed of 2.4 x 10 7 m/s and travels a distance of 2.8 cm, what... more


How to calculate kinetic energy of a system? (Momentum and impulse)

I posted this question yesterday, but there is another part of the problem I don't understand   A 0.76 kg fireworks rocket moving at a speed of 32 m/s breaks into two pieces as the result of an... more


A car is moving with a sped of 15km/h and another identical car is moving at a speed of 30km/h.Conpare their kinetic energy

It’s a kinetic energy sun with formula 1/2mv2


Physics Mechanical Energy and Friction

An asteroid with a mass of 5.0 x 105 kg collides with the Earth and slides horizontally along the ground without bouncing (not actually possible but just pretend). The velocity of the asteroid... more


Energy lost to heat

In an attempt for a physics teacher to explain the conservation of energy to a student, the teacher goes down a 6.0 m high sliding board. At the bottom, he only travels 7.0 m/s. If the mass of the... more


Conservation of Energy

A 45 kg student runs with a speed of 2.0 m/s off a horizontal ledge that is 5.0 above a swimming pool. Calculate the vertical speed of the student when she hits the water.   ...   Energy before... more



Two charges q1 = −3.20 nC and q2 = +8.15 nC are at a distance of 1.28 µm from each other. q1 is fixed at its location while q2 is released from rest. (a) What is the kinetic energy of the charge... more


Calculate velocity and acceleration during collisions.

A small car of mass 500kg is travelling at 120km/h when it hits stationary truck (of 1.5 tonne mass) head on. The small car rebounds and travels in the opposite direction at 40km/h. The collision... more


Physics: Work, Kinetic Energy, and Energy Lost to Friction

A 1.00-kg block is pushed along a rough horizontal floor with a horizontal force of 5.00 N for a distance of 5.00 m. If the block is moving at a constant velocity of 4.00 m/s, find... The work... more


physics-KE question

A girl on a playground swing starts from rest at an angle θ=34.2 from the vertical. The chains have length L=6.8 meters. Find her speed as she passes through the bottom of the swing. Assume no... more


A wagon moving at a speed of 25 km/have has a kinetic energy of 6000 kg•km2/h2. What is the mass of the wagon

A wagon moving at 25 km/h has a kinetic energy of 6000 kg•km2/h2. What is the mass of the wagon


Structure of atoms related doubt

Photon is incident have frequency 1×?10?^14 sec^(-1). Threshold frequency of metal is 5 × ?10?^13 sec^(-1).find kinetic energy of electron 2.electron in hydrogen atom jump from excited state n to... more


For each postulate of the Kinetic-Molecular Theory of Gases write a further description or give a real world example of how that postulate can be observed.

Postulates of the Kinetic-Molecular Theory of Gases:   1. Gas particles are extremely small and have relatively large distances between them. 2. Gas particles act independently of one another... more


What is the minimum kinetic energy..?

A diagram shows a moving 5.00-kilogram cart at the foot of a hill 10.0 meters high. What is the minimum kinetic energy needed for the cart to move from its current position to reach the top of the... more


Physics question below

  You slide a block with a mass of m down an incline plane with a height of h that has a length of L. If there is a kinetic friction f acting on the object as it slides down the incline then at... more

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