The force of Earth's gravity on a capsule in space increases as it comes closer. When the capsule moves to half its distance, the force toward Earth is then
A) twice.
B) three times greater.
C) four times greater.
D) none of the above
Answer: C
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The amount of gravitational potential energy released as an object falls depends on
A) its mass, the distance it falls, and the acceleration of gravity. B) its mass and its speed at the time it begins falling. C) its mass and its speed when it hits the ground. D) only its mass and the acceleration of gravity. E) only the acceleration of gravity.
A geophysicist measures the magnetic force on a proton that is moving vertically downward at a point 1.996 km/s at the earth's equator. At that location, the earth's magnetic magnetic field is horizontal and has a strength of 0.40 × 10-4 T
What are the magnitude and direction of the force she will measure? (e = 1.60 × 10-19 C)
A spring-powered dart gun is un-stretched and has a spring constant 10.0 N/m. The spring is compressed by 8.00 cm and a 5.00 gram projectile is placed in the gun. The kinetic energy of the projectile when it is shot from the gun is
A. 0.020 J. B. 0.032 J. C. 0.060 J. D. 0.100 J. E. 0.120 J.
A baseball is moving in the air along the customary parabola. Ignoring air drag, where is the force on the baseball zero?
a. at the top of the parabola c. where it is about to impact b. just when it has started upward d. nowhere