A ball rests in the middle of a cart. When you quickly jerk the cart forward, the ball
A) hits the front of the cart.
B) hits the back of the cart.
C) remains in the middle of the cart.
D) all, depending on how quickly the cart is pulled
Answer: B
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Resolution: Given perfect lenses, what is the main reason that a telescope with a large-diameter objective lens can produce a sharper image than one with a small-diameter lens?
A. A larger lens can gather more light than a smaller lens. B. A larger lens can focus more accurately than a smaller lens. C. There is less diffraction with a larger lens than with a smaller lens. D. A larger lens can focus more wavelengths of light than a smaller lens. E. A larger lens has a longer focal length than a smaller lens.
When we look at the Andromeda Galaxy tonight though our telescope, we see this galaxy
a) as it was just after the big bang b) as it was 3.2 years ago as it was when the light left this galaxy c) as it is now because light travel instantaneously d) as it was 2.5 million years ago when the light that we are seeing today left that galaxy
When 5.0 A at 110 V flows in the primary of an ideal transformer, how many amps at 24 V can flow in the secondary?
A) 5.0 A B) 1.1 A C) 23 A D) 4.6 A
A capacitor of capacitance C takes 2 s to reach 63% of its maximum charge when connected in series to a resistance R and a battery of emf
How long does it take (from zero initial charge) for this capacitor to reach 95% of its maximum charge? A) 3 s B) 5 s C) 7 s D) 4 s E) 6 s