In an apparatus such as that in the figure below, suppose the black disk is replaced by one with half the radius. Which of the following are different after the disk is replaced? ced current?
a)radiation pressure on the disk
b)radiation force on the disk
c)radiation momentum delivered to the disk in a given time interval
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What is the fundamental reason that Mars, unlike Earth, has become virtually geologically dead?
A) its small size compared to Earth B) its large size compared to Earth C) its farther distance than Earth to the Sun D) its closer distance than Earth to the Sun E) its rapid rotation compared to Earth F) its slow rotation compared to Earth
Water pressurized to 3.00 × 10^5 Pa is flowing at 5.25 m/s in a pipe which contracts to 1/2 of its former area. What are the pressure and speed of the water after the contraction? (Density of water = 1 × 10^3 kg/m3.)
a. 2.59E+5 Pa, 10.5 m/s b. 3.00E+5 Pa, 2.63 m/s c. 3.00E+5 Pa, 10.5 m/s d. 4.59E+5 Pa, 10.5 m/s e. 2.59E+5 Pa, 2.63 m/s
If you were living in South America (i.e. in the Southern hemisphere):
A) the Sun would never set in July. B) there would be no seasons. C) it would be warmer in December than in July. D) it would snow in December and be sunny in July. E) days would be longer in July than in December.
The Hubble time is
a. the time it takes a galaxy moving at 1000 km/s to move 1 Mpc. b. the time it takes the galaxy to double its size. c. the time since recombination occurred. d. the time remaining before the Universe stops expanding and begins to contract. e. an estimate of the age of the Universe based on the Hubble constant.