A 20.0 kg box slides up a 12.0 m long incline at an angle of 30.0 degrees with the horizontal. A force of 150 N is applied to the box to pull it up the incline. The applied force makes an angle of 10.0 degrees to the incline. What is the work done by the applied force, in Joules?
A. 1,870
B. 1,770
C. 1,500
D. 1,450
E. 1,380
B. 1,770
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Which of these is not a possible representation of electric field lines?
A. A
B. B
C. C
D. D
An eyeglass lens is cut with one surface having a radius R1 and the other surface having a radius R2, with R1 < R2 . Both positive radii are measured from the same side with R1 being the side closer to the eye. Is this convex-concave lens a converging lens or a diverging lens?
a. This is a converging lens. b. This is a diverging lens. c. This can be either a converging or diverging lens, as more information is needed for a final determination. d. This is neither, since a lens cannot be made this way.
A lightbulb cannot absorb charge
Indicate whether the statement is true or false
The reason the north pole of a bar magnet free to rotate points north is because
A. the south geographic pole of the earth is the Earth's magnetic north pole. B. the south geographic pole of the earth is the Earth's magnetic south pole. C. there is a net accumulation of negative magnetic charge at the Earth's south geographic pole. D. there is a net accumulation of positive magnetic charge at the Earth's north geographic pole. E. the north geographic pole of the Earth is the earth's magnetic north pole.