a 30kg child who is running at 4m/s jumps onto a stationary 10kg skateboard. what is the approximate speed of the child and skateboard

When an electron moves 2.5 m in the direction of an electric field, the change in electrical potential energy of the electron is 8x10-17j. what is the strength of the electric field that causes the change in potential energy?

You did 150 joules of work lifting a 120-newton backpack. a. How high did you lift the backpack? b. How much did the backpack weigh in pounds?

Can you think of some places where we use electric buzzers

Determine the kinetic energy of a 55kg woman running with the velocity of 5.87m/s

All planets revolve around the sun counterclockwise, and most also rotate on their axis counterclockwise true or false

The amount of energy carried by a wave is proportional to the square of the wave's A. frequency B. amplitude C. wavelength D. period ... ?

The pressure at the bottom of a jug filled with water does not depend on

at what other angle will a thrown ball go the same distance as one thrown at an angle of 75 degrees?

A record player turntable initially rotating at 3313 rev/min is braked to a stop at a constant rotational acceleration. The turntable has a rotational inertia of 0.031kg? m2.

A steam engine does 12 kJ or work in 55 s. how much power does the engine produce?