Increasing the temperature of 50 grams of water by 1°C requires
A) 1 calorie.
B) 50 calories.
C) more than 50 calories.
D) none of the above
Answer: B
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A 70-kg swimmer dives horizontally off a 500-kg raft. The diver's speed immediately after leaving the raft is 6.0 m/s. A micro-sensor system attached to the edge of the raft measures the time interval during which the diver applies an impulse to the raft just prior to leaving the raft surface. If the time interval is read as 0.25 s, what is the magnitude of the average horizontal force by diver
on the raft? a. 110 N b. 420 N c. 2 000 N d. 1 700 N e. 24 N
An electron with a charge value of 1.6 × 10^-19 C is moving in the presence of an electric field of 300 N/C. What force does the electron experience?
a. 2.3 × 10^-22 N c. 6.4 × 10^-17 N b. 4.8 × 10^-17 N d. 1.9 × 10^-21 N
The heat capacity at constant volume and the heat capacity at constant pressure have different values because:
A. heat increases the temperature at constant volume but not at constant pressure B. heat increases the temperature at constant pressure but not at constant volume C. the system does work at constant volume but not at constant pressure D. the system does work at constant pressure but not at constant volume E. the system does more work at constant volume than at constant pressure
The star Betelgeuse appears red; the star Rigel appears blue. What accounts for this difference? a. Betelgeuse and Rigel have different chemical compositions
b. Betelgeuse is moving away from Earth, Rigel is moving toward Earth. c. Betelgeuse is moving toward Earth, Rigel is moving away from Earth. d. The surface of Betelgeuse is hotter than the surface of Rigel. e. The surface of Betelgeuse is cooler than the surface of Rigel.