A student ate a Thanksgiving dinner that totaled 2800 Cal . He wants to use up a

Question

A student ate a Thanksgiving dinner that totaled 2800 Cal . He wants to use up all that energy by lifting a 23-kg mass a distance of 1.0 m. Assume that he lifts the mass with constant velocity and no work is required in lowering the mass.

Part A

How many times must he lift the mass?

Express your answer using two significant figures.

Part B

If he can lift and lower the mass once every 5.2 s , how long does this exercise take?

Part B

If he can lift and lower the mass once every 5.2 s , how long does this exercise take?

Explanation / Answer

According to the question we need to find the How many times must he lift the mass and how long does this exercise take.

2800 cal * ( 1000 cal / 1 cal ) * ( 4.18 J/lkcal ) = 1.1704x107 J

P.E = mgh

h = 1.1704x107 J / 23 kg * 9.8 * 1.0 m = 51925.46584 times the mass ==============ANSWER)

Part b) 51925.46584 * 5.2 s = 3.125143 days ================================ANSWER)

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