Only two elements, mercury and ______________, are liquid at room temperature and atmospheric pressure
a. sodium
b. bromine
c. phosphorus
d. iodine
b
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The end of a compass needle that points to the south pole of a magnet is the
A) north pole. B) south pole. C) both of these
Suppose your normal resting heart rate is 60 beats per minute. Now, suppose you board a spaceship that travels away from Earth at 90% of the speed of light. While on the ship, you measure your heart rate. What will it be?
A) It will be 46 beats per minute. B) It will be 74 beats per minute. C) It will still be 60 beats per minute. D) It will be 12 beats per minute.
A small sphere attached to a light rigid rod rotates about an axis perpendicular to and fixed to the other end of the rod. Relative to the positive direction of the axis of rotation, the angular positions of the sphere are positive, its angular velocity is positive, and its angular acceleration is negative. The sphere is
a. rotating clockwise and slowing down. b. rotating counterclockwise and slowing down. c. rotating clockwise and speeding up. d. rotating counterclockwise and speeding up. e. first rotating clockwise and then counterclockwise.
Two simple pendulums of equal length l = 0.45 m are suspended from the same point. The pendulum bobs are small solid steel spheres. The first bob is drawn back to make a 35° angle with the vertical, while the other one is left hanging at rest
If the first bob has a mass of 0.25 kg and the second has a mass of how high will the second bob rise above its initial position when struck elastically by the first bob after it is released? A) 2.7 cm B) 3.3 cm C) 4.4 cm D) 3.9 cm