A 3.00-kg stone is dropped from a 39.2 m high building. When the stone has fallen 19.6 m, the magnitude of the impulse the Earth has received from the gravitational force exerted by the stone is
A.
s.B.
s.C.
s.D.
s.E.
s.Answer: D
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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.
What are the mechanisms that restrict the mass range of stars to about 0.1 to 100 solar masses?
What will be an ideal response?
A rocket, initially at rest, is fired vertically with an upward acceleration of 10 m/s2 . At an altitude of 0.50 km, the engine of the rocket cuts off. What is the maximum altitude it achieves?
a. 1.9 km b. 1.3 km c. 1.6 km d. 1.0 km e. 2.1 km
The different colors of the spectrum
A) are sharply divided. B) blend from one to another. C) differ from the colors of a rainbow.