For every action force, there must be a reaction force that
A) acts in the same direction.
B) is slightly smaller in magnitude than the action force.
C) is slightly larger in magnitude than the action force.
D) is equal in magnitude.
Answer: D
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Which of the following explains why, about 13,000 years from now, Vega will be a better North Star than Polaris?
A) Earth rotates once each day. B) Earth orbits the Sun once each year. C) The direction of Earth's axis in space precesses with a period of about 26,000 years. D) Stars appear to move randomly relative to our Sun in the local solar neighborhood. E) The universe is expanding.
A large ice mass that flows on a land surface under the influence of gravity is called
a. a glacier. b. a land slide. c. an ice river. d. none of these.
Which is NOT an example of the Bernoulli effect?
a. Smoke going up a chimney faster when there is a wind outside. b. A roof coming off a house in a tornado. c. A tarp covering a truck lifting up as the truck drives. d. Drinking a liquid through a straw. e. A piece of paper held in front of your lips rising as you blow air over it.
A string is wrapped tightly around a fixed pulley that has a moment of inertia of 0.0352 kg and a radius of 12.5 cm. A mass of 423 g is attached to the free end of the string
With the string vertical and taut, the mass is released so it can descend under the influence of gravity. As the mass descends, the string unwinds and causes the pulley to rotate. What is the speed of the mass after it has fallen through 1.25 m? A) 2.00 m/s B) 2.28 m/s C) 1.97 m/s D) 3.94 m/s E) 4.95 m/s