Suppose your normal resting heart rate is 60 beats per minute. Now, suppose you board a spaceship that travels away from Earth at 90% of the speed of light. While on the ship, you measure your heart rate. What will it be?
A) It will still be 60 beats per minute.
B) It will be 46 beats per minute.
C) It will be 74 beats per minute.
D) It will be 12 beats per minute.
A) It will still be 60 beats per minute.
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A coaxial cable has an inner cylindrical conductor surrounded by cylindrical insulation and an outer cylindrical conducting shell. The outer shell carries the same current but in the opposite direction from that in the inner conductor as shown. If the coaxial cable sits in a uniform magnetic field directed upwards with respect to the cable, the effect of the field on the cable is
A. a net force to the left. B. a net force to the right. C. a net force upwards. D. no net force but a slight shift of the inner conductor to the left and the outer conductor to the right. E. no net force but a slight shift of the inner conductor to the right and the outer conductor to the left.
A dielectric material such as paper is inserted between the plates of a capacitor as the capacitor holds a fixed charge on its plates. What happens to the electric field between the plates as the dielectric is inserted?
A) There is no change in the field. B) The field becomes stronger. C) The field becomes weaker. D) The field reduces to zero.
When the hydrogen isotope tritium-3 emits a beta particle, it becomes an isotope of
A) hydrogen. B) helium. C) lithium. D) carbon. E) none of the above
What is the mass of an electron in MeV/c2?
a. 0.511 MeV/c2 b. 105.7 MeV/c2 c. 1777 MeV/c2 d. none of the above