A high-diver of mass 70.0 kg jumps off a board 10.0 m above the water. If, two seconds after entering the water, his downward motion is stopped, what average upward force did the water exert on him?
1 180 N
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A rocket is launched from the origin with an acceleration of 20.0 
at an angle of 30.0 degrees above the horizontal. The launch acceleration lasts for 2.00 seconds at which time the fuel is exhausted. The rocket then falls with an acceleration of 9.80 
downward. What is the maximum height?
A. 22.3 m B. 27.5 m C. 30.5 m D. 36.7 m E. 20.0 m
In electromagnetic waves, the electric and magnetic fields vibrate ________ to each other
Fill in the blank(s) with correct word
The place the Sun stops its northward motion along the ecliptic is the:
A) equator. B) prime meridian. C) summer solstice. D) vernal equinox. E) node of the ecliptic.
A soap film is being viewed in white light. As the film becomes very much thinner than the wavelength of blue light, the film
A) appears black because it reflects no visible light. B) appears blue since all other colors are transmitted. C) appears white because it reflects all wavelengths of visible light. D) appears red since all other colors are transmitted.