A car is traveling at 20.0 m/s on tires with a diameter of 70.0 cm. The car slows to a rest after traveling 300.0 m
If the tires rolled without slipping, what was the magnitude of the average angular acceleration of the tires during the time the car slowed to a rest? A)
0.667 rad/s2
B)
1.33 rad/s2
C)
0.952 rad/s2
D)
1.67 rad/s2
E)
1.90 rad/s2
E
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A 5-kg piece of lead (specific heat 0.03 cal/g/°C) having a temperature of 80°C is added to 500 g of water having a temperature of 20°C. What is the final equilibrium temperature (in °C) of the system?
a. 79 b. 26 c. 54 d. 34 e. 20
Which person’s watch or clocks register(s) the space time interval between those events?
A. Alice B. Bob C. Carol D. Alice and Bob E. Bob and Carol F. Alice and Carol T. All three observers
A ball is thrown upward at a velocity of 19.6 m/s. What is its velocity after 3.0 s, assuming no air?
A) 9.8 m/s upward B) 9.8 m/s downward C) 0 m/s D) 19.6 m/s downward
Which of the following statements about the force attracting these two galaxies is true?
A) It is the same force that causes an apple to fall to the ground. B) It is a force unlike any force that we ever experience on Earth. C) It is a mysterious force, whose nature remains completely unknown to scientists. D) The force will get weaker as time passes.