Kieran Takes Off Down a 50 M High,10° Slope on His

question 1

Multiple Choice

Kieran takes off down a 50 m high,10° slope on his jet-powered skis.The skis have a thrust of 280 N.The combined mass of skis and Kieran is 50kg (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:

Polarity

The property of having distinct and opposite ends or poles, used in various contexts such as electricity, magnetism, and molecular chemistry.

Membrane

A thin layer of tissue or material that acts as a boundary, separating different areas or substances, crucial in cellular function and structure.

Depolarization

The process by which a neuron's membrane potential becomes less negative, making the neuron more likely to fire an action potential.

Hyperpolarization

A change in a cell's membrane potential that makes it more negative, moving further away from zero, which decreases the likelihood of generating an action potential.