A64 kg skier leaves the end of a ski-jump ramp with a velocity of 27 m/s directed 25° above the horizontal. suppose that as a result of air drag the skier returns to the ground with a speed of 25 m/s, landing 17 m vertically below the end of the ramp. from the launch to the return to the ground, by how much is the mechanical energy of the skier–earth system reduced because of air drag?

Imagine you are riding on a yacht in the ocean and traveling at 20 mph. you then hit a golf ball at 100 mph from the deck of the yacht. you see the ball move away from you at 100mph, while a person standing on a near by beach would observe your golf ball traveling at 120 mph (20 mph + 100 mph). now imagine you are aboard the hermes spacecraft traveling at 0.1c (1/10 the speed of light) past mars and shine a laser from the front of the ship. you would see the light traveling at c (the speed of light) away from your ship. according to einstein’s special relativity, how fast will a person on mars observe the light to be traveling? a) 0.1c (1/10 the speed of light) b) c (the speed of light) c)1.1c (c+0.1c)

The frequencies refer to the sample data collected from a population of interest when performing a hypothesis test comparing two or more population proportions.

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