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
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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?
A. 4.0 m/s2 B. 3.8 m/s2 C. 4.2 m/s2 D. 4.5 m/s2
An 80-km/h airplane caught in a 60-km/h crosswind has a resultant speed of
A) 60 km/h. B) 80 km/h. C) 100 km/h. D) 141 km/h.
A particle moves along a circular path having a radius of 2.0 m. At an instant when the speed of the particle is equal to 3.0 m/s and changing at the rate of 5.0 m/s2, what is the magnitude of the total acceleration of the particle?
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
Contrast the orbits of comets and asteroids
What will be an ideal response?