the electromagnetic force on the proton 
A. The vector points in the +x direction.
B. The vector points in the -x direction.
C. The vector points in the +y direction.
D. The vector points in the -y direction.
E. The vector points in the +z direction.
F. The vector points in the -z direction.
T. The vector is zero.
T. The vector is zero.
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A spaceship of mass m circles a planet (mass = M) in an orbit of radius R. How much energy is required to transfer the spaceship to a circular orbit of radius 3R?
a. GmM/(2R) b. GmM/(3R) c. GmM/(4R) d. GmM/(6R) e. 3GmM/(4R)
If the kinetic energy of a proton is 80% of its total energy, what is the speed of the proton?
A) 0.02c B) 1.0c C) 0.87c D) 0.98c
When you blow some air above a paper strip, the paper rises. This is because
A) the air above the paper moves faster and the pressure is higher. B) the air above the paper moves faster and the pressure is lower. C) the air above the paper moves faster and the pressure remains constant. D) the air above the paper moves slower and the pressure is higher. E) the air above the paper moves slower and the pressure is lower.
Suppose that Earth's spin would suddenly reverse direction, but the direction of Earth's motion around the Sun was preserved. Which of the following changes would you expect to observe?
A. The stars would rise in the west and set in the east. B. The planets would rise in the west and set in the east. C. The Sun would rise in the west and set in the east. D. All of these would be observed. E. None of these choices is correct.