Slow surface evolution on the moon is limited to
a. low density masses of rock rising from the interior.
b. low level meteorite impacts.
c. moonquakes disturbing the surface features.
d. motion along a network of small faults.
e. all of the above
B
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Photoelectric Effect: If the work function of a metal surface is 2.20 eV, what frequency of incident light would give a maximum kinetic energy of 0.25 eV to the photoelectrons ejected from this surface? (1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s)
A. 2.05 × 1014 Hz B. 1.02 × 1014 Hz C. 2.50 × 1014 Hz D. 3.53 × 1014 Hz E. 5.92 × 1014 Hz
The sun has apparent brightness B at the earth, which is 1.5 × 108 km away
What would be the apparent brightness of the sun at Pluto, which is 6.0 × 109 km from the sun? A) 0.063 B B) 0.00063 B C) 0.025 B D) 0.25 B
A block (mass = 4.0 kg) sliding on a horizontal frictionless surface is attached to one end of a horizontal spring (k = 100 N/m) which has its other end fixed. If the maximum distance the block slides from the equilibrium position is equal to 20 cm, what is the speed of the block at an instant when it is a distance of 16 cm from the equilibrium position?
a. 71 cm/s b. 60 cm/s c. 80 cm/s d. 87 cm/s e. 57 cm/s
A heat pump has a coefficient of performance of 4 . If the heat pump absorbs 20 cal of heat from the cold outdoors in each cycle, the heat expelled (in cal) to the warm indoors is
a. 34 b. 27 c. 36 d. 40 e. 80