One piece of evidence that Democritus found for his idea that everything is made of atoms was
A) the smell of bread and of other substances.
B) the random, chaotic motions often found in liquids.
C) the fact that chemicals combine in definite proportions.
D) Brownian motion.
E) the twinkling of stars, due to our atmosphere.
A
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Suppose you throw an apple horizontally. Neglecting air resistance, just after you release the apple from your hand, the net force on the apple is
A) zero. B) directed horizontally forward. C) directed horizontally backward. D) directed downward. E) directed upward.
The difference in time between the arrival of S waves and the arrival of P waves can be used to determine
a. the magnitude of an earthquake. b. the epicenter of an earthquake. c. the damage caused by an earthquake. d. all of the above.
In an electromagnetic wave in free space, the electric and magnetic fields are
A) parallel to one another and perpendicular to the direction of wave propagation. B) perpendicular to one another and parallel to the direction of wave propagation. C) perpendicular to one another and perpendicular to the direction of wave propagation. D) parallel to one another and parallel to the direction of wave propagation.
A 72.0-kg person pushes on a small doorknob with a force of 5.00 N perpendicular to the surface of the door. The doorknob is located 0.800 m from axis of the frictionless hinges of the door
The door begins to rotate with an angular acceleration of 2.00 rad/s2. What is the moment of inertia of the door about the hinges? A) 4.28 kg ? m2 B) 7.52 kg ? m2 C) 1.88 kg ? m2 D) 0.684 kg ? m2 E) 2.74 kg ? m2