A cyclist is standing still at the top of a hill and then begins to coast down the hill. The mass of the cyclist and bicycle is 64 kg total. The cyclist’s gravitational potential energy is converted into kinetic energy with an efficiency of 52%. What is her speed when she reaches a point that is a vertical distance of 10 m lower than the point at which she started? Show all your work.

10.1 m/s

Explanation:

52% of the potential energy is converted to kinetic energy.

0.52 PE = KE

0.52 mgh = ½ mv²

0.52 gh = ½ v²

v = √(1.04 gh)

v = √(1.04 × 9.8 m/s² × 10 m)

v = 10.1 m/s

b. lifting dumbbell weight at 20-degree angle from the body after a 45-degree angle

radial fractures in a piece of glass look most like which of the following?

a. spokes of a wheel

b. a circle

c. a zig zag

d. none of the above

the correct answer is a. spokes of a wheel

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