Of the quarks u, d, c, s, t, and b, which have positive fractional electronic charge?
a. u, d, c b. d, s, b
c. s, t, b d. u, c, t
d
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The metric system is preferred over the British system in science for the following main reason
A) The metric system is more precise than the British system. B) Metric quantities can be defined more accurately than the quantities in the British system. C) Metric quantities are natural whereas British quantities are invented. D) Conversions between metric quantities are especially easy because they are all related by factors of ten.
According to the quantum theory of radiation, when a vibrating charged particle emits radiation it
(a) continues vibrating without making any change in its state of vibration. (b) suddenly loses a portion of its charge. (c) suddenly turns into a photon. (d) instantaneously changes from a particle to a wave. (e) instantaneously changes from one state of vibration to a different state.
A hot (85.0°C) lump of metal has a mass of 210 g and a specific heat of 0.250 cal/g/°C. John drops the metal into a 345-g calorimeter containing 95 g of water at 21.3°C. The calorimeter is constructed of a material that has a specific heat of 0.100 cal/ g/°C. When equilibrium is reached, what will be the final temperature? cwater = 1.00 cal/g/°C
a. 35.6°C b. 63.9°C c. 49.6°C d. 39.7°C e. 29.4°C
A thin rectangular piece of wood floats in water. You slowly pour oil with a density equal to that of the wood on the surface of the water until the height of the oil above the water is twice the height of the piece of wood. Which statement is correct?
a. The wood floats on top of the oil, so it sticks up in the air. b. The wood does not change its position c. The wood sinks below the surface of the water. d. The wood is half in the water and half in the oil. e. The wood floats in the oil just above the water.