The center of mass of Earth\'s atmosphere is: a little less than halfway between

Question

The center of mass of Earth's atmosphere is: a little less than halfway between the Earth's surface and the other boundary of the atmosphere near the surface of the Earth near the outer boundary of the atmosphere near the center of the Earth none of the above A thick uniform wire is bent into the shape of the letter "U" as shown. Which point indicates the location of the center of mass of this wire? A B C D E A man sits in the back of a canoe in still water. He then moves to the front of the canoe and sits there. Afterwards the canoe: is forward of its original position and moving forward is forward of its original position and moving backward is rearward of its original position and moving forward is rearward of its original position and moving backward is rearward of its original position and not moving A 2.5-kg stone is released from rest and falls toward Earth. After 4.0 s, the magnitude of its momentum is: 98 kg m/s 78 kg m/s 39 kg m/s 24 kg m/s zero

Explanation / Answer

17 - A
18 - B
19 - C
20 - V= u + gt = 9.8 * 4 = 39.2 m/s
So, momentum , p = mv = 98 kg-m/s
A

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