A dime is 1.8 cm in diameter. At what distance from your eye would you have to hold a dime so that it has the same angular diameter as the full Moon?

a. 2 m
b. 2 cm
c. 2 km
d. 2 inches
e. 2 ft


a

Physics & Space Science

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State and describe the three phases of matter

What will be an ideal response?

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Standing waves can result from _____ waves

a. longitudinal b. transverse c. both longitudinal and transverse d. neither longitudinal nor transverse

Physics & Space Science

A heat engine absorbs 2 500 J of heat from a hot reservoir and expels 1 000 J to a cold reservoir. When it is run in reverse, with the same reservoirs, the engine pumps 2 500 J of heat to the hot reservoir, requiring 1 500 J of work to do so. Find the ratio of the work done by the heat engine to the work done by the pump. Is the heat engine reversible?

a. 1.0 (no) b. 1.0 (yes) c. 1.5 (yes) d. 1.5 (no) e. 2.5 (no)

Physics & Space Science

Alpha decay occurs in some radioactive nuclides with A > 150. The probability of an alpha particle being emitted depends on the energy of the alpha particle. Why is this so?

a. Wave functions for the alpha particle must decrease to zero when the strong force potential goes to zero. b. Alpha particles must pass through classically forbidden regions with high potential barriers. c. The Coulomb potential for the alpha particle depends on the energy of the alpha particle. d. To emit the alpha particle, the nucleus must be hit by a gamma ray that has energy inversely proportional to the probability it will strike the nucleus.

Physics & Space Science