While yet unproven, the proposed WIMPS would be:
A) massive like neutrons, but more elusive than neutrinos.
B) made of only strong magnetic fields.
C) rapidly decaying due to the weak nuclear force.
D) changing charges and polarities too rapidly to pin down.
E) the basic building blocks of neutrons and protons.
A
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The apparent weight of a fish in an elevator is greatest when the elevator
A. moves downward at constant velocity. B. moves upward at constant velocity. C. accelerates downward. D. accelerates upward. E. is not moving.
A gas that expands adiabatically
1.experiences no temperature change. 2.has no work done on it and does no work. 3.experiences no change in internal energy due to energy transfer by heat 4.increases in temperature.
If the ground state energy level of an electron in a rigid box is 5.0 eV, what is the width of the box?
A) 2.3 × 10-11 m B) 7.3 × 10-20 m C) 2.7 × 10-10 m D) 1.0 × 10-10 m E) 9.1 × 10-21 m
Two blocks hang from strings would around different parts of a 2 kg double pulley as shown. The pivot exerts a normal force FN supporting the double pulley. Assuming the system is not in equilibrium, which statement about FN is true after the system is released from rest? (Use g = 10 N/kg.)