The strong force depends upon the electric charge of the particles involved
Indicate whether the statement is true or false
F
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A satellite in circular orbit around the Earth moves at constant speed. This orbit is maintained by the force of gravity between the Earth and the satellite, yet no work is done on the satellite.
A. No work is done because there is no gravity in space. B. No work is done if objects move in a circle. C. No work is done if the direction of motion is perpendicular to the force. D. No work is done if there is no contact between objects.
When a cube is inscribed in a sphere of radius r, the length L of a side of the cube is 
. If a positive point charge Q is placed at the center of the spherical surface, the ratio of the electric flux ?sphere at the spherical surface to the flux ?cube at the surface of the cube is
A.
.B.
.C.
D.
.E.
.The flow rate of a liquid through a 2.0-cm radius pipe is 0.016 m3/s. The average fluid speed in the pipe is:
a. 0.64 m/s. c. 0.040 m/s. b. 13 m/s. d. 6.4 m/s.
The most common type of star is a(n) ____
a. white dwarf b. lower-main-sequence star c. upper-main-sequence star d. giant e. supergiant