Analysis of the solar spectrum shows that the Sun is mostly _____
A) helium
B) hydrogen
C) fluorine
D) nitrogen
B
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Consider a heavy object which is thrown straight up, reaches its highest point, and then falls back down to the ground. During what parts of the trajectory was it in "FREE FALL"? (assume here that air friction is negligible)
What will be an ideal response?
A volume of air that is compressed with no heat entering or leaving becomes
A) cooler. B) remain unchanged. C) warmer. D) none of the above
A net force acting on an object will always cause a change in the object's ________
A) speed B) mass C) direction D) momentum
A uniform electric field, with a magnitude of 600 N/C, is directed parallel to the positive x axis. If the potential at x = 4.0 m is 1000 V, what is the change in potential energy of a proton as it moves from x = 4.0 m to x = 1.0 m? (qp = 1.6 × 10^-19 C)
a. 500 J c. 1.9 × 10^-16 J b. 2.9 × 10^-16 J d. 8.0 × 10^-17 J