A torque of 12 N ? m is applied to a solid, uniform disk of radius 0.50 m, causing the disk to accelerate at What is the mass of the disk?
A) 17 kg
B) 13 kg
C) 8.5 kg
D) 4.3 kg
Answer: A
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Two athletes jump straight up. John has twice the initial speed of Harry. Compared to Harry, John stays in the air
A) 0.50 times as long as Harry. B) the same time as Harry. C) twice as long as Harry. D) three times as long as Harry. E) four times as long as Harry.
Which of the following energy transport processes involves mass motions of material?
a. radiation b. conduction c. convection d. All of the other choices are correct.
If we say that a galaxy has a lookback time of 1 billion years, we mean that
A) its light traveled through space for 1 billion years to reach us. B) it is now 1 billion light-years away. C) it was 1 billion light-years away when the light left the galaxy. D) it is 400 million years old.
According to the Aristotelian view of motion, which of these would NOT work?
a. an arrow flying away from a bow a rocket ship going to the moon b. an apple falling from a tree to the ground a person climbing a tree c. a stone dropping through water to the creek bed