Radiation: Two identical objects are placed in a room with a temperature of 20°C. Object A has a temperature of 50°C, while object B has a temperature of 90°C. What is the ratio of the net power emitted by object B to the power emitted by object A?
A. 1.7
B. 2.8
C. 81
D. 17
E. 21
Answer: B
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What led Kepler to abandon circular orbits and his discovery that planetary orbits are ellipses?
A) a deviation between observed and model values that was much larger than the observation uncertainties B) a desire to gain prestige by using a more complicated model C) the observation of a comet moving on a highly eccentric orbit
A plane flies directly from city A to city B, which are separated by 2300 mi. From A to B, the plane flies into a 65 mi/h headwind. On the return trip from B to A, the wind velocity is unchanged
The trip from B to A takes less than the trip from A to B. What is the airspeed (assumed constant) of the plane relative to the air (that is, the airspeed)? A) 530 mi/h B) 610 mi/h C) 480 mi/h D) 400 mi/h
A heavy downpour associated with a severe local storm is commonly referred to as
a) a rainstorm. b) a blizzard. c) a shower. d) an electrical storm.
The volume of a gas changes from 0.750 m3 to 0.320 m3 at a constant pressure of 1.5 × 10^5 Pa. How much work is done by the gas on its environment?
a. 4.8E+4 J b. –6.5E+4 J c. –4.8E+4 J d. 6.5E+4 J