1. Consider the skateboarder in the figure below. If she has a mass of 49 kg, an

Question

1.Consider the skateboarder in the figure below. If she has a mass of 49 kg, an initial velocity of 23 m/s, and a velocity of 13 m/s at the top of the ramp, what is the work done by friction on the skateboarder? Ignore the kinetic energy of the skateboard's wheels.

Consider the skateboarder in the figure below. If she has a mass of 49 kg, an initial velocity of 23 m/s, and a velocity of 13 m/s at the top of the ramp, what is the work done by friction on the skateboarder? Ignore the kinetic energy of the skateboard's wheels. 2.Suppose a molecular motor consumes 3 ATP molecules in every step. If this motor has a step size of 5.8 nm, what is the maximum force the motor could exert? (The energy released when a single ATP molecule is consumed is EATP = 5.times 10-20 J. (answer is in pN)

Explanation / Answer

(a)

Here i am assuming h=5
The work Wfr done by friction is:
Wfr = m g h + (1/2) m V^2 - (1/2) m Vo^2
Wfr = 49*{9.81*5 + 0.5*13^2 - 0.5*23^2}
= 49*(-130.95)
= - 6416.55 J

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