A car, driven around a circle with constant speed, must have
A) zero acceleration.
B) a centrifugal acceleration.
C) zero velocity.
D) a centripetal acceleration.
E) a tangential acceleration.
D
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Gravitational lensing is the process by which
A) a massive object magnifies and distorts the light from an object behind it B) the wavelengths of light from a star are shifted as it moves about its center of mass C) a planet passes in front of its parent star and blocks part of its light D) a massive object accelerates another object that passes close to it
A long linear charge distribution of charge density 1.35 nC/m is surrounded by a concentric cylindrical surface of length 1.60 m and radius 23.6 cm. What is the magnitude of the electric field at the curved surface of the cylinder?
A. 436 N/C B. 103 N/C C. 51.5 N/C D. 135 N/C E. 0.0
The Ptolemaic model has planets moving in
A) elliptical orbits about the Sun B) a simple circle about the Earth C) a simple circle about the Sun D) small circles, the centers of which move in a larger circle about the Earth
An electron, initially at rest, accelerates through a potential difference of 1 V, gaining kinetic energy KEe, while a proton, also initially at rest, accelerates through a potential difference of –1 V, gaining kinetic energy KEp, which of the following relationships holds?
1. KEe = KEp 2. KEe < KEp 3. KEe > KEp 4.The answer can’t be determined from the given information