1) A 20.0 kg box slides up a 12.0 m long incline at an angle of 30.0 degrees wit

Question

1) 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

2) An 8000 kg satellite is launched from the surface of the earth, and injected into a circular orbit at an altitude of 100 km above the surface of the earth. The kinetic energy of the satellite in the circular orbit is (G = 6.67 10-11 Nm2/kg2, Me = 5.98 1024 kg, Re = 6.38 106 m)
A) 5.02 1011 J.
B) 4.25 1011 J.
C) 3.45 1011 J.
D) 2.46 1011 J.
E) 2.01 1011 J.

Explanation / Answer

1)work done=150*cos10*12=1772

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