A swimmer swims 20 laps in a north-south facing pool in 7.00 minutes. Her first lap is toward the north. Her displacement and average velocity are
a. 0; 0.
b. 0; 2.38 m/s, south.
c. 0; 2.38 m/s, north.
d. 1 000 m, south; 2.38 m/s, south.
e. 1 000 m, north; 2.38 m/s, north.
a
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The age of the solar system is believed to be approximately 4.6 billion years based on the data from
a. samples of lunar rocks. b. samples of Earth rocks. c. samples of meteorites. d. samples of lunar rocks, Earth rocks, and meteorites. e. None of the other choices are correct.
A chain, 10.0 m in length and with a mass of 3.00 kg/m but negligible thickness, is wrapped around a spool with a radius of 25.0 cm
and a moment of inertia (not including the chain) of 0.360 kg?m2. With 1.00 m of chain hanging over the side, the spool is released so that it can turn freely about its axle. What is the angular speed of the spool at the moment that 5.00 m of chain are hanging over the side? A) 8.90 rad/s B) 17.8 rad/s C) 19.4 rad/s D) 22.1 rad/s E) 44.3 rad/s
What is the force of gravity acting on a 1-kg mass? (g = 9.8 m/s2)
In an isobaric process 4.0 × 10^4 J of work is done on a quantity of gas while its volume changes from 2.5 m3 to 1.5 m3 . What is the pressure during this process?
a. 3.4E+4 Pa b. 2.8E+4 Pa c. 4.0E+4 Pa d. 4.6E+4 Pa