Charge Q is uniformly distributed over a line segment of length 2L, as shown below. When the x-coordinate of point P is x, the magnitude of the y-component of the electric field at point P is
A.
B.
.C.
.D.
.E.
.Answer: A
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An instrument is thrown upward with a speed of 15 m/s on the surface of planet X where the acceleration due to gravity is 2.5 m/s2 and there is no atmosphere. How long does it take for the instrument to return to where it was thrown?
A) 12 s B) 6.0 s C) 10 s D) 8.0 s
Which of the following phrases best describes heat?
1.The total energy possessed by a body. 2.The flow of temperature to or from a body. 3.The amount of energy dissipated by friction. 4.The total energy flowing between two bodies at different temperatures. 5.The useful work that could be extracted from a body.
Dimensional Analysis: The distance d through which a beam of length L is deflected when it is subjected to a fixed load may be described by the relationship d = RL2. What are the SI units of the constant R?
A. m3 B. m2 C. m D. m-1 E. R is dimensionless
An ice skater performs a pirouette (a fast spin) by pulling in his outstretched arms close to his body. What happens to his rotational kinetic energy about the axis of rotation?
A) It changes, but it is impossible to tell which way. B) It increases. C) It does not change. D) It decreases.