Reference no: EM132591825

1.While jogging, a 62.2 kg student generates thermal energy at a rate of 1210 W. To maintain a constant body temperature of 37.0°C, this energy must be removed by perspiration or other mechanisms. If these mechanisms failed and the heat could not flow out of the student's body, irreversible body damage could occur.

Protein structures in the body are irreversibly damaged if body temperature rises to 44.0°C or above. The specific heat of a typical human body is 3480J/(kg⋅K), slightly less than that of water. (The difference is due to the presence of protein, fat, and minerals, which have lower specific heat capacities.)

Part A

For how long a time t could a student jog before irreversible body damage occurs?

Express your answer in minutes.

2.Just about everyone at one time or another has been burned by hot water or steam. This problem compares the heat input to your skin from steam as opposed to hot water at the same temperature.

Assume that water and steam, initially at 100 °C , are cooled down to skin temperature, 34.0 °C , when they come in contact with your skin. Assume that the steam condenses extremely fast. We will further assume a constant specific heat capacity c=4190J/(kg⋅K) for both liquid water and steam.

How much heat H2 is transferred by 41.0 g of water onto the skin? To compare this to the result in the previous part, continue to assume that the skin temperature does not change.

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