Earth exerts a gravitational force of 432 N on an object on its surface. Earth has radius R. If the object is raised to a height of 3R above Earth's surface, what is the gravitational force that Earth will exert on it?
A) 108 N
B) 48.0 N
C) 27.0 N
D) 305 N
E) 144 N
C
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The figure shows a cross section of three parallel wires each carrying a current of 24 A. The currents in wires B and C are out of the paper, while that in wire A is into the paper. If the distance R = 5.0 mm, what is the magnitude of the force on a 4.0-m length of wire A?
A. 15 mN B. 77 mN C. 59 mN D. 12 mN E. 32 mN
The symbol indicating the number of protons in a nucleus is N
a. True b. False Indicate whether the statement is true or false
What distinguishes work done by conservative versus nonconservative forces?
What will be an ideal response?
The two photons produced in an electron-positron annihilation have equal but oppositely-directed momenta to match the zero momentum of the electron-positron pair. Which of the following conservation laws are obeyed in the pictured interaction?
a. Conservation of energy. b. Conservation of momentum. c. Conservation of charge. d. Both a. and b. but not c. e. All of a., b. and c.