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
B. 9.90 N.
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If a two-dimensional universe has a negative curvature,
a. the area of a circle will be greater than ?r2. b. the area of a circle will be equal to ?r2. c. the universe is infinite. d. the universe is finite but bounded. e. the universe will have a center.
The intricate patterns visible in an X-ray image of the Sun generally show
A) helioseismological fluctuations. B) a bubbling pattern on the photosphere. C) extremely hot plasma flowing along magnetic field lines. D) structure within sunspots.
A boy throws a ball with an initial velocity of 25 m/s at an angle of 30° above the horizontal. If air resistance is negligible, how high above the projection point is the ball after 2.0 s?
A) 25 m B) 43 m C) 13 m D) 50 m E) 5.4 m
In the Bohr model of the hydrogen atom both the energy and orbital angular momentum of the electron are quantized
a. True b. False Indicate whether the statement is true or false