The force of Earth's gravity on a capsule in space will lessen as it moves farther away. If the capsule moves to twice its distance, the force toward Earth becomes
A) half.
B) three-quarters.
C) one-fourth.
D) none of the above
Answer: C
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Two long, parallel wires carry currents of 20.0 A and 10.0 A in opposite directions (Fig. OQ30.9). Which of the following statements is true? More than one statement may be correct
Why do we sometimes observe asteroids at the distances of the gaps in the asteroid belt?
A) Jupiter's gravitational tugs keep them there.
B) They are held in place by resonances with other asteroids.
C) Actually, we never see asteroids in the gaps.
D) They are kept in place by shepherding asteroids.
E) A gap is located at an average orbital distance, and asteroid orbits often have large eccentricities.
Photos A and B both show the same field of view containing a star-forming molecular cloud. One of the photos was taken in visible light and the other in infrared light. Which one is the visible-light photo, and how do you know?
A) Photo A is the visible-light photo, and we can tell because dust in the molecular cloud absorbs visible light, making the cloud appear dark. B) Photo A is the visible-light photo because its stars are more colorful. C) Photo B is the visible-light photo because more stars are visible in the molecular cloud. D) Photo B is the visible-light photo because the molecular cloud has a reddish tint.
A body moving along the x axis is acted upon by a force Fx that varies with x as shown. How much work is done by this force as the object moves from x = 1 m to x = 8 m?
?
?
A. ?2 J B. ?18 J C. ?10 J D. ?26 J E. +18 J