Which of the following conversions of energy is possible?
a. kinetic energy to thermal energy
b. solar energy to chemical energy
c. chemical energy to thermal energy
d. nuclear energy to electrical energy
e. All the other conversions are possible.
E
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A small block of mass m can slide along the frictionless loop-theloop. The block is released from rest at point P, at height h = 5R above the bottom of the loop. How much work does the gravitational force do on the block as the block travels from point P to
(a) point Q and
(b) the top of the loop?
If the gravitational potential energy of the block–Earth system is taken to be zero at the bottom of the loop, what is that potential energy when the block is
(c) at point P,
(d) at point Q, and
(e) at the top of the loop?
(f) If, instead of being released, the block is given some initial speed downward along the track, do the answers to (a) through (e) increase, decrease, or remain the same?
If a star's temperature increases in its interior, then more nuclear reactions will occur to push the star outward and its temperature will drop, causing the star to contract and eventually return to equilibrium
a. True b. False Indicate whether the statement is true or false
To a reasonable approximation, the density of a nucleus
A) varies unpredictably for different values of Z. B) is independent of the mass number. C) is greater for large-Z nuclei. D) is smaller for large-Z nuclei.
A catapult fires an 800-kg rock with an initial velocity of 100 m/s at a 40° angle to the ground. The magnitude of the horizontal impulse the catapult receives from the rock is
a. 5.1 × 10^4 N s. b. 6.1 × 10^4 N s. c. 8.0 × 10^4 N s. d. 5.0 × 10^5 N s. e. 6.0 × 10^5 N s.