Materials having resistance changes as voltage or current varies are called:
a. ohmic.
b. inohmic.
c. nonohmic.
d. deohmic.
c
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A grinding wheel has a mass of 250 kg and moment of inertia of 500 kg 
A torque of 100 N•m is applied to the grinding wheel. If the wheel starts from rest, what is the angular momentum of the wheel after 5.0 seconds?
A. 650 kg 
B. 500 kg
C. 450 kg
D. 300 kg
E. 250 kg
Einstein's principle of the constancy of lightspeed and principle of relativity are
A) assumptions which cannot be proven. B) the basic principles of his theory of relativity. C) Both of the above. D) Neither of the above. E) now known to be false at the microscopic level.
Protostars can be observed in:
A) the Crab Nebula. B) the Andromeda Galaxy. C) the Orion Nebula. D) our Solar System. E) the Helix Nebula.
A magnetic field is directed out of the page. Two charged particles enter from the top and take the paths shown in the figure. Which statement is correct?
A. Particle 1 has a positive charge and particle 2 has a negative charge. B. Both particles are positively charged. C. Both particles are negatively charged. D. Particle one has a negative charge and particle 2 has a positive charge. E. The direction of the paths depends on the magnitude of the velocity, not on the sign of the charge.