The number of protons in a neutral atom is balanced by an equal number of
A) electron shells that surround the nucleus.
B) neutrons in the nucleus.
C) orbital electrons.
D) none of the above
Answer: C
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A 0.330-kg volleyball is thrown vertically downward with a speed of 0.150 m/s in a place where g = 9.81 m/s2. It takes it 0.0655 s to reach the ground. What is the magnitude of its momentum just before it hits the ground?
A) 0.212 kg ? m/s B) 0.262 kg ? m/s C) 0.163 kg ? m/s D) 0.0216 kg ? m/s E) 0.0418 kg ? m/s
A certain crate sits on a rough floor. You find that you have to apply a horizontal force of 200 N to get the crate moving. If you put some massive objects in the crate so that its mass is doubled, how much force does it take to get the crate moving now?
A. Still 200 N B. 400 N C. 800 N D. It depends (specify)
Approximately how fast is a person located at the Earth's equator traveling due to the rotation of the Earth?
A) 1,700 km/hr B) 17 km/hr C) 17,000 km/hr D) 170 km/hr E) not moving at all
A beam of light of wavelength 600 nm is incident normally on a grating with a spacing between slits of 1.70 × 10-4 cm. At what angle away from the centerline does a first-order maximum occur?
A) 10.5° B) 12.1° C) 16.4° D) 18.2° E) 20.7°