Calorimetry: A 35-g block of ice at -14°C is dropped into a calorimeter (of negligible heat capacity) containing 400 g of water at 0°C. When the system reaches equilibrium, how much ice is left in the calorimeter? The specific heat of ice is 2090 J/kg ? K, that of water is 4186 J/kg ? K, and the latent heat of fusion of water is 33.5 × 104 J/kg.
A. 32 g
B. 33 g
C. 35 g
D. 38 g
E. 41 g
Answer: D
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Global warming
a. has not yet been observed b. has been caused by increasing levels of carbon dioxide in the atmosphere c. has led to a depletion of the ozone layer in the atmosphere d. has no serious consequences
If an x-ray machine were designed to operate at two separate accelerating voltages, one double the other, how would the shortest wavelength, ?min,h?, and the maximum frequency, fmax,h?, at the higher voltage compare to those (?min,lv, fmax,lv) at the lower voltage? ?min,hv/ ?min,lv = ________, fmax,hv/ fmax,lv =________:
a. 2, 2. b. 2, 1/2. c. 1/2, 2. d. 1/2, 1/2.
If an irregularly shaped object (such as a wrench) is dropped from rest in a classroom and feels no air resistance, it will
A) accelerate but will not spin. B) accelerate and turn until its center of gravity reaches its lowest point. C) accelerate and turn about its center of gravity with uniform angular speed. D) accelerate and turn about its center of gravity with uniform angular acceleration. E) accelerate and spin until its center of gravity reaches its highest point.
John is carrying a shovelful of snow. The center of mass of the 3.00 kg of snow he is holding is 15.0 cm from the end of the shovel. He is pushing down on the opposite end of the shovel with one hand and holding it up 30.0 cm from that end with his other hand. Ignore the mass of the shovel. Sarah says that his hand pushing down on the shovel must be exerting a greater force than the hand pushing
up. James says it is just the reverse. Which one, if either, is correct? a. Sarah, because the hand pushing down must exert a greater force to match the torque exerted by the snow. b. James, because, depending on the location of the axis of rotation, the hand pushing down can counteract the torque exerted by the snow. c. James, because the hand pushing up must exert a force that equals the sum of the force of the hand pushing down and the weight of the snow. d. James, because both (b) and (c) above are correct. e. Neither, because the hands exert forces of equal magnitudes.