How much electrical charge is needed to raise an isolated metal sphere of radius 1.0 m to a potential of 1.0 × 10^6 V?
1.1 × 10^?4 C
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A ball at the end of a string is swinging as a simple pendulum. Assuming no loss in energy due to friction, we can say for the ball that
A. the kinetic energy does not change but the potential energy does. B. the mechanical energy changes and is maximum where the kinetic energy is minimum. C. the potential energy is maximum at each end of the motion. D. the mechanical energy changes and is maximum where the kinetic energy is maximum.
An extrasolar planet is
a. a planet that orbits our sun that we have not yet discovered. b. one not needed for the formation of our solar system which is kept in a special area just in case. c. a planet found orbiting around a star other than the sun. d. another name for an asteroid. e. a planet extra close to our sun.
Spherical Mirrors: An object that is 2.0 cm tall is placed at the center of curvature in front of a concave mirror. How tall is its image?
A. 0.50 cm B. 1.0 cm C. 1.5 cm D. 2.0 cm E. infinite
In 1919, general relativity was tested by measuring the deflection of starlight by the Sun. What event made this measurement possible?
A) a total solar eclipse B) a rare alignment in which some stars were positioned almost perfectly behind the Sun as viewed from Earth C) the first international treaty in which astronomers from different nations all worked together D) Einstein's personal permission for the measurements to be carried out