Which of the following stars is a part of the Solar System?
A) The Sun
B) Proxima Centauri
C) Sirius
D) The Pistol Star
A
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The clouds of Venus are much higher in its atmosphere than are those in our troposphere
Indicate whether the statement is true or false
The acceleration of a body is
a. always in the same direction as its velocity b. always in the same direction as the net force on the body c. in the direction that the body is moving d. equal to the net force on the body e. none of the above
A wave is a vibration in
A) space. B) time. C) both of these D) none of the above
Two protons are fired toward each other in a particle accelerator, with only the electrostatic force acting. Which of the following statements must be true about them as they move closer together? (There could be more than one correct choice.)
A) Their kinetic energy keeps decreasing. B) Their electric potential energy keeps decreasing. C) Their electric potential energy keeps increasing. D) Their kinetic energy keeps increasing. E) Their acceleration keeps decreasing.