Dept of Physics & Comp. Sti VERS COLLEGE of CUNY Test # NAME Instructions: Mark

Question

Dept of Physics & Comp. Sti VERS COLLEGE of CUNY Test # NAME Instructions: Mark your test letter on your Scantr Multiple-Choice antron sheet. The usage of cell phor on sheet. The mass 100 kg) at 4 m/s, anvd iill rid 1. virgi mass 64 ke) at 5 m/s l rides a skateboard (combined mass 100 ke) at a m A. Virgil has the greater kinetic en Virgil has the greater kinetic energy B. Jill has the greater kinetic energy C. Virgil and ill have equal kinetic energies 2. An object with a kinetic energy of 40 J is stopped in a distance of that stops the object is A. 40,000 N B. 4,000 N C. 400 N. D, 40 N. E. 0.4 N 3. A 3.0-kg cat runs to the left at 10 m/s and a 10-kg dog runs to kinetic energy is A. -35 Joule. C. -70 Joule. D. 146 Joule. E. 230 Joule. 4. A child riding on a swing rises to a height 1.0 m above the equal mass whose speed at the lowest point is twice as great will ris A. to a height which depends on the mass. B. to the same height. C. twice as high. D. four times as high.

Explanation / Answer

1.)

B, Jill has gretaer kinetic energy

KE = 0.5 m v^2

2.)

work done = chage in KE

Force * distance = 40 J

Force = 40 / distance

3.) 230 J

total KE = 0.5mv^2 + 0.5 m1v1^2

4.)four imes as high

0.5mv^2 = mgh

h' = 4h

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