Shoveling snow can be extremely taxing since the arms have such a low efficiency in this activity. Suppose a person shoveling a sidewalk metabolizes food at the rate of 900 W. (The efficiency of a person shoveling is 3%.) (a) What is her useful power output (in W)? (b) How long (in s) will it take her to lift 2,900 kg of snow 1.20 m? (This could be the amount of heavy snow on 60.0 ft of sidewalk.) What is the relationship between power output, work output and the time needed to do the work? Can you express the power output in terms of the efficiency and the power input? Can you express the work output in term of the change in gravitational potential energy of the snow? s (c) How much waste heat (in J) will she generate in the process? J
Shoveling snow can be extremely taxing since the arms have such a low efficiency in this activity. Suppose a person shoveling a sidewalk metabolizes food at the rate of 900 W. (The efficiency of a person shoveling is 3%.) (a) What is her useful power output (in W)? (b) How long (in s) will it take her to lift 2,900 kg of snow 1.20 m? (This could be the amount of heavy snow on 60.0 ft of sidewalk.) What is the relationship between power output, work output and the time needed to do the work? Can you express the power output in terms of the efficiency and the power input? Can you express the work output in term of the change in gravitational potential energy of the snow? s (c) How much waste heat (in J) will she generate in the process? J
Shoveling snow can be extremely taxing since the arms have such a low efficiency in this activity. Suppose a person shoveling a sidewalk metabolizes food at the rate of 900 W. (The efficiency of a person shoveling is 3%.) (a) What is her useful power output (in W)? (b) How long (in s) will it take her to lift 2,900 kg of snow 1.20 m? (This could be the amount of heavy snow on 60.0 ft of sidewalk.) What is the relationship between power output, work output and the time needed to do the work? Can you express the power output in terms of the efficiency and the power input? Can you express the work output in term of the change in gravitational potential energy of the snow? s (c) How much waste heat (in J) will she generate in the process? J
Shoveling snow can be extremely taxing since the arms have such a low efficiency in this activity. Suppose a person shoveling a sidewalk metabolizes food at the rate of 900 W. (The efficiency of a person shoveling is 3%.)
(a)
What is her useful power output (in W)?
(b)
How long (in s) will it take her to lift 2,900 kg of snow 1.20 m? (This could be the amount of heavy snow on 60.0 ft of sidewalk.)
What is the relationship between power output, work output and the time needed to do the work? Can you express the power output in terms of the efficiency and the power input? Can you express the work output in term of the change in gravitational potential energy of the snow? s
(c)
How much waste heat (in J) will she generate in the process?
J
Chemical pathways by which living things function, especially those that provide cellular energy, such as the transformation of energy from food into the energy of ATP. Metabolism also focuses on chemical pathways involving the synthesis of new biomolecules and the elimination of waste.
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