A kid slides down an icy (frictionless) hill starting from rest. At the top his gravitational potential energy is 500 J.He slides all the way down to the valley bottom where his gravitational potential energy becomes zero. His kinetic energy at the bottom will be
a. 0 J. b. 500 J.
c. some value between 0 and 500 J. d. none of the above.
b
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In order to understand what the universe was like before 10-44 seconds we need
A) a way to measure more distant Type Ia supernovae B) to understand how helium can be made from hydrogen in stars C) to develop Quantum Field Theory D) to harness the power of black holes E) a way to combine the theories of General Relativity and Quantum Mechanics
The air temperature on a summer day might be about:
A. 0? C B. 10? C C. 25? C D. 80? C E. 125? C
The reason that you do not observe a Doppler shift when you listen to the car radio while driving is that
A) the source and observer are moving at the same speed. B) the air inside the car is moving at the same speed as the car. C) the speed of the car is too slow compared to the speed of sound. D) the speed of the car is too fast compared to the speed of sound. E) there is a Doppler shift but we don't notice it.
An electron (m = 9.1 × 10?31 kg, q = ?1.6 × 10?19 C) starts from rest at point A and has a speed of 5.0 × 106 m/s at point B. Only electric forces act on it during this motion. Determine the electric potential difference VA?VB.
A. ?71 V B. +71 V C. ?26 V D. +26 V E. ?140 V