An infrared thermometer operates by way of
A) temperature differences.
B) radiant energy invisible to humans.
C) conduction, convection, and radiation.
D) none of the above
Answer: B
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A mountain climber lies flat on the surface of a glacier that is inclined at 30 degrees below the horizontal. He remains stationary because he is holding onto a rope attached to a spike embedded in the ice further up slope than he is. The rope is parallel to the surface of the ice. If the force of the ice upon his body is 210N, what is the tension in the rope?
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What happens when a planet passes in front of its star (i.e. between the star and us)?
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Is the mass of an atomic nucleus greater or less than the sum of the masses of the nucleons composing it? Why don't the nucleon masses add up to the total nuclear mass?
A) Greater. We need to add the masses of the surrounding electrons to the masses of the nucleons. B) Neither. The mass of the atomic nucleus is exactly the sum of the masses of the nucleons. C) Less. The individual nucleons have greater mass when separated from the nucleus. This additional mass is a result of the energy of separation. D) Greater. The mass of the atomic nucleus also has mass of the "atomic glue" that holds the nucleons together in the nucleus.