A rock is dropped from rest off of a high cliff on another planet, planet X. There is no atmosphere, and thus no air resistance, on planet X. At the end of 1 second, the rock is moving at a speed of 6 m/s
At the end of 2 seconds, it is moving at 12 m/s. How fast will the rock be moving at 4 seconds after being dropped?
A) 20 m/s B) 40 m/s C) 24 m/s D) 18 m/s E) 36 m/s
C
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Compared to the amount of electric current in the filament of a lamp, the amount of current in the connecting wire is
A) definitely less. B) often less. C) actually more. D) the same. E) incredibly, all of the above
The International Space Station is orbiting at an altitude of about 370 km above the earth's surface. The mass of the earth is 5.97 × 1024 kg, the radius of the earth is 6.38 × 106 m, and G = 6.67 × 10-11 N ? m2/kg2
Assuming a circular orbit, (a) what is the period of the International Space Station's orbit? (b) what is the speed of the International Space Station in its orbit?
General Questions: The figure shows two boxes, with m1 > m2, that are on a level frictionless surface. We can apply a horizontal force 
either toward the right on m1 or toward the left on m2. The magnitude of the force that the boxes exert on each other is
A. zero newtons in either case.
B. larger if 
is applied toward the right.
C. larger if 
is applied toward the left.
D. the same in either case.
Why is siltation such a pressing question for dam builders? Explain how you decided on your answer
What will be an ideal response?