In bombarding atomic nuclei with proton "bullets," the protons must be accelerated to high energies to make contact with the target nuclei
A) because the target nuclei are so small.
B) because the target nuclei are negatively charged.
C) in order to penetrate through the electrons that surround each target nucleus.
D) because the target nuclei are positively charged.
Answer: D
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If a material is heated until it is green hot, then
A) it would liquefy immediately. B) it would be hotter than white hot. C) its molecules would be vibrating at nearly identical rates. D) it would be a strong absorber of red light. E) energy conservation would be violated.
If the headlights on a car are separated by 1.3 m, how far down the road can they be resolved if the angular resolution of the eye is about 5 × 10-4 rad?
A) 1.3 km B) 5.0 km C) 4.8 km D) 0.65 km E) 2.6 km
A steel wire hangs from a high-altitude balloon. The steel has unit weight 77 kN/m3 and yield stress of 280 MPa. The required factor of safety against yield is 2.0. The maximum permissible length of the wire is approximately:
(A) 1800 m (B) 2200 m (C) 2600 m (D) 3000 m
The purpose of prescription glasses for a near-sighted person is to bring the apparent positions of distant objects
A. to the far point of the eye. B. to the near point of the eye. C. to the retina of the eye. D. none of the above.