Imagine that you are sitting in a closed room (no windows, no doors) when, magically, it is lifted from Earth and sent accelerating through space with an acceleration of 1g (9.8 m/s2)
According to Einstein's equivalence principle, which of the following is true? A) You won't feel any change and will have no way to know that you've left Earth.
B) You'll feel a force that will cause your head to repeatedly bang into the ceiling.
C) You'll know that you left Earth because when you drop a ball it will fall sideways.
D) You'll know that you left Earth because you'll be floating weightlessly in your room.
A
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How fast would you have to drive in order to see a red light as green? Assume 
= 630 nm for red and 
= 530 nm for green
A. 
B. 
C. 
D. 
In alpha decay the mass number (the total number of protons and neutrons) of the parent nuclide decreases by
A. 0 B. 2 C. 4 D. 6
Adding a few impurity atoms, like arsenic or gallium, to a semiconductor can produce
A. abundant thermal inversion. B. a significant increase in mass, even though the impurity atoms are quite sparse. C. gravitational repulsion of the impurity atoms, like the expanding universe. D. useful changes in the conductivity.
A flat rectangular coil with dimensions of 8.0 cm × 10 cm is dropped from a zero magnetic field position into a 1.4-T magnetic field in 0.10 s
The coil has 60 turns and is perpendicular to the magnetic field. What is the average induced emf in the coil as a result of this action? A) 8.6 V B) 2.4 V C) 6.7 V D) 3.6 V E) 0 V