The large reflector, the 10 m Keck, gathers ________ light than the 1.0 m Yerkes refractor
A) 10 times less
B) 10 times more
C) 100 times more
D) 100 times less
E) an equal amount of
C
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A child runs at 3.0 m/s and jumps onto a sled, initially at rest. If the child's mass is 36 kg, and if the child and sled slide off together at 2.0 m/s after the collision, the sled's mass is
A. 48 kg. B. 18 kg. C. 12 kg. D. 36 kg.
From hottest to coolest, the order of the spectral types of stars is ________
A) OBAGFKM B) ABCDEFG C) ABFGKMO D) OBAFGKM E) OMKGFBA
Two square air-filled parallel plates that are initially uncharged are separated by 1.2 mm, and each of them has an area of 190 mm2
How much charge must be transferred from one plate to the other if 1.1 nJ of energy are to be stored in the plates? (?00 = 8.85 × 10-12 C2/N • m2) A) 56 pC B) 39 pC C) 78 pC D) 3.5 µC
After rolling half-way down an incline, a marble's kinetic energy is
A) less than its potential energy. B) greater than its potential energy. C) the same as its potential energy.