Simple harmonic oscillations can be modeled by the projection of circular motion at constant angular velocity onto a diameter of the circle. When this is done, the analog along the diameter of the acceleration of the particle executing simple harmonic motion is
a. the displacement from the center of the diameter of the projection of the position of the particle on the circle. b. the projection along the diameter of the velocity of the particle on the circle. c. the projection along the diameter of tangential acceleration of the particle on the circle. d. the projection along the diameter of centripetal acceleration of the particle on the circle. e. meaningful only when the particle moving in the circle also has a non-zero tangential acceleration.
D
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Which of the following is the origin of almost all the large moons around the jovian planets?
A) They are captured planets. B) They are captured asteroids. C) They were formed by giant impacts. D) They were formed by condensation and accretion in a disk of gas around the planet. E) They are captured comets.
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
An ideal parallel-plate capacitor consists of two parallel plates of area A separated by a distance d. This capacitor is connected to a battery and charged until its plates carry charges +Q and -Q, and the battery is then disconnected
If the separation between the plates is now doubled, the electrical energy stored in the capacitor will A) double. B) quadruple. C) be cut in half. D) be cut in fourth. E) not change.
The first scientist to be credited for postulating that Earth circled the Sun was
A) Aristotle. B) Copernicus. C) Galileo. D) Newton.