A book is given a brief shove along a table top and released so that it slides a short distance and comes to rest. According to Aristotle, it stopped because
A) the ether slows it down to a stop.
B) its natural motion is to come to rest.
C) of its inertia.
D) of gravity.
E) of friction.
B
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Heat Engines: A heat engine receives 7000 J of heat and loses 3000 J in each cycle. What is the efficiency of this engine?
A. 57% B. 30% C. 70% D. 43%
A blue ball is dropped from the roof of a tall building simultaneously with the horizontal launch of a red ball. Which statement is true?
A. the red ball strikes the ground first with the higher speed B. both balls hit the ground at the same time, but the red ball has the higher speed C. the blue ball strikes the ground first, but with the lower speed D. both balls hit the ground at the same time with the same speed
What does the prefix micro- stand for?
What will be an ideal response?
An empty spice bottle has an inner volume of 1.31 × 10^-4 m3 . It has a mass of 112 g when filled with air, and it displaces 1.63 × 10^-4 m3 of water when fully submerged. What fraction of the total volume of the bottle will be beneath the surface when it is placed in a tank of water?
a. 0.69 b. 0.81 c. 0.85 d. 1.00 e. 1.46