48 Answered Questions for the topic kinetic energy

12/21/19

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

12/06/19

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)?

09/28/18

what is the kinetic energy

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

09/28/18

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

05/03/18

what is kinetic energy

i want to know more about kinetic and potential energy  

04/05/18

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

03/06/18

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

02/07/18

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

12/31/17

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

12/30/17

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

07/30/17

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

07/27/17

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

02/17/17

Electrostatics

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

02/14/17

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

11/27/16

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

11/16/16

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

11/07/16

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

10/10/16

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

08/29/16

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

06/05/16

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

03/28/16

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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