A 100-g cube of ice is heated from ?120°C to +120°C. In which of the following processes is the greatest amount of energy absorbed by this material?
A. warming ice to the melting point
B. melting the ice to become water
C. warming the resulting water
D. vaporizing the water to become steam
E. heating the steam
Answer: D
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Slanting Surfaces With Friction: A 5.0-kg box slides on the surface on a ramp that rises at 37° above the horizontal. The coefficient of kinetic friction between the box and the surface of the ramp is 0.60. What are the magnitude and direction of the acceleration of the box if it is sliding (a) up the ramp, (b) down the ramp?
What will be an ideal response?
Series/Parallel Circuits: What is the magnitude of the potential difference between points C and D for the circuit shown in the figure? The battery is ideal, and all the numbers are accurate to two significant figures.
A. 6.0 V B. 4.0 V C. 3.0 V D. 2.0 V
Ball A is dropped from the top of a building. One second later, ball B is dropped from the same building. Neglect air. As time progresses, the difference in their speeds
A) increases. B) remains constant. C) decreases. D) cannot be determined from the information given.
What is the particle referred to as a WIMP?
a. the result of a neutrino oscillation b. a hypothetical particle left over from the Big Bang c. a hypothetical particle in the MOND theory d. none of the above