At the center of the Sun, fusion converts hydrogen into

A) hydrogen compounds.
B) plasma.
C) radiation and elements like carbon and nitrogen.
D) radioactive elements like uranium and plutonium.
E) helium, energy, and neutrinos.


E

Physics & Space Science

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Slanting Surfaces Without Friction: A 15-kg block is on a frictionless ramp that is inclined at 20° above the horizontal. It is connected by a very light string over an ideal pulley at the top edge of the ramp to a hanging 19-kg block, as shown in the figure. The string pulls on the 15-kg block parallel to the surface of the ramp. Find the magnitude of the acceleration of the 19-kg block after the system is gently released?

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An 80-km/h airplane caught in a 60-km/h crosswind has a resultant speed of

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A. 7.5 m/s2 B. 6.0 m/s2 C. 5.4 m/s2 D. 6.7 m/s2 E. 4.5 m/s2

Physics & Space Science