Spaceships A and B are moving in the same direction along the same straight line. Spaceship A is moving at 0.800 c relative to a stationary observer, and spaceship B is moving at 0.800 c relative to spaceship A. What does the stationary observer find for the speed of spaceship B?
A. 1.60 c
B. 1.28 c
C. 1.00 c
D. 0.780 c
E. 0.980 c
E. 0.980 c
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A planet with a density comparable to the Earth but several times more massive is described as a
A) mini-Neptune B) super-Earth C) mega-Earth D) super-Jovian
A rock is thrown at a window that is located 18.0 m above the ground. The rock is thrown at an angle of 40.0° above horizontal. The rock is thrown from a height of 2.00 m above the ground with a speed of 30
0 m/s and experiences no appreciable air resistance. If the rock strikes the window on its upward trajectory, from what horizontal distance from the window was it released? A) 53.2 m B) 48.7 m C) 71.6 m D) 29.8 m E) 27.3 m
A rocket with a mass of 500 grams is launched straight up. It achieves a velocity of 20.0 m/s in 2.00 seconds. The average thrust force of the engines on the rocket is
A. 7.50 N. B. 9.90 N. C. 12.0 N. D. 13.5 N. E. 20.0 N
A total solar eclipse occurs for people in the Sun's
A) umbra. B) penumbra. C) none of these