The Sun's rays are transmitted to Earth by means of
a. radiation.
b. convection.
c. temperature.
d. conduction.
a
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Impulse: A force of 5.3 N is needed to hold on to an umbrella in a strong wind. If the air molecules each have a mass of 4.7 × 10-26 kg, and each one strikes the umbrella (without rebounding) with a speed of 2.0 m/s in the same direction, how many atoms strike the umbrella each second? Assume that the wind blows horizontally so that the gravity can be neglected.
What will be an ideal response?
From the following statements regarding the ratio of the molar specific heat at constant pressure to the molar specific heat at constant volume, Cp/Cv, the only correct one for an ideal monatomic gas is
A) = 1. B) > 1. C) < 1. D) Cp/Cv is sometimes more than 1, sometimes less than 1, but never equal to 1. E) Cp/Cv is sometimes more than 1, sometimes equal to 1, but never less than 1.
How do astronomers think Jupiter generates its internal heat?
A) chemical processes B) radioactive decay C) nuclear fusion in the core D) by contracting, changing gravitational potential energy into thermal energy E) internal friction due to its high rotation rate
One material used in nuclear bombs is 239Pu, with a half-life of 24,000 years. How long must we wait for a buried stockpile of this substance to decay to 1/1000 of its original activity?
A) 1,200,000 years B) 240,000 years C) 150,000 years D) 82,000 years E) 1,500 years