Kieran Takes Off from Rest Down a 50 M High,10°

question 72

Multiple Choice

Kieran takes off from rest down a 50 m high,10° slope on his jet-powered skis.The skis have a thrust of 280 N parallel to the surface of the slope.The combined mass of skis and Kieran is 50 kg (the fuel mass is negligible) .Kieran's speed at the bottom is 40 m/s.What is the coefficient of kinetic friction of his skis on snow?

• A) 0.47
• B) 0.58
• C) 0.23
• D) 0.29

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Definitions:

Testosterone

The male sex hormone, high levels of which have been linked to aggression and violence in both animals and humans.

Serotonin

A neurotransmitter that plays a key role in regulating mood, appetite, sleep, and other functions within the body.

Testosterone

A steroid hormone that plays a key role in the development of male reproductive tissues and secondary sexual characteristics, though it is present in both sexes.

Aggressive Cues

Environmental or psychological triggers that can provoke aggressive responses or behaviors.