Object A has an electric charge that is 10 times larger than the charge on object B. When placed near each other, how does the force by A on B compare with the force by B on A?
A) The force by A on B is 10 times smaller.
B) The force by A on B is 100 times larger.
C) The force by A on B is 10 times larger.
D) The force by A on B is 100 times smaller.
E) They are equal.
E
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Center of Mass: A 3.0-kg mass is located at (0.0 m, 8.0 m), and a 1.0-kg mass is located at (12 m, 0.0 m). You want to add a 4.0-kg mass so that the center of mass (or center of gravity) of the three-mass system will be at the origin. What should be the coordinates of the 4.0-kg mass?
A. (-3.0 m, -6.0 m) B. (-12 m, -8.0 m) C. (3.0 m, 6.0 m) D. (-6.0 m, -3.0 m)
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A long 1-cm-diameter electric copper cable is embedded in the center of a 25 cm square concrete block. If the outside temperature of the concrete is 25°C and the rate of electrical energy dissipation in the cable is 150 W per meter length, determine the temperatures at the outer surface and at the center of the cable.
GIVEN
FIND
The temperatures at the outer surface (Ts) and at the center of the cable (Tc)
ASSUMPTIONS
Two dimensional, steady state heat transfer
Uniform thermal conductivities
SKETCH
