A long solenoid (radius = 3.0 cm, 2 500 turns per meter) carries a current given by I = 0.30 sin(200 t) A, where t is measured in s. When t = 2.5 ms, what is the magnitude of the induced electric field at a point which is 4.0 cm from the axis of the solenoid?
a. 9.3 × 10^-3 V/m
b. 8.0 × 10^-3 V/m
c. 6.7 × 10^-3 V/m
d. 5.3 × 10^-3 V/m
e. 1.9 × 10^-3 V/m
E
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The cork in a bottle is 2.00 cm in diameter. If the pressure inside the bottle is 3.00 atm, then the net force on the cork due to the pressure difference is
A. 37.5 N. B. 45.5 N. C. 48.9 N. D. 55.3 N. E. 63.8 N.
In what sense is our modern concept of an "atom" not accurate to its ancient meaning?
A) "Atom" means indivisible, but we now know that atoms are actually made of smaller particles. B) "Atom" means particle, but we now know that particles also have the properties of waves. C) "Atom" means identical, but we now know that not all atoms are the same. D) "Atom means solid, but we now know that atoms are mostly empty space.
Is space expanding within clusters of galaxies? Why or why not?
A) no, because their gravity is strong enough to hold them together even while the universe as a whole expands B) no, because the universe is not old enough yet for these objects to have begun their expansion C) no, because expansion of the universe affects only empty space, not space in which matter is present D) Yes, and that is why clusters tend to grow in size with time.
Tom is going to your left at 90% of the speed of light and Joan is going to your right at 90% of the speed of light. What will Tom say about you and Joan?
A) You are moving away from him at 90% the speed of light. Joan is moving away from him at 180% of the speed of light. B) You are moving away from him at 90% the speed of light. Joan is moving away from him at as speed that is faster than 90% of the speed of light, but slower than the whole speed of light. C) You are moving away from him at 90% the speed of light. Joan is moving away from him at as speed of light. D) You and Joan are both moving away from him at 90% the speed of light.