What is the current through the 2.0-? resistor?
a.
1.0 A
b.
0.50 A
c.
1.5 A
d.
2.0 A
a
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Compare the rate of heat loss from a human body with the typical energy intake from consumption of food (4.325 MJ/day). Model the body as a vertical cylinder 30 cm in diameter and 1.8-m-high in still air. Assume the skin temperature is 2°C below normal body temperature. Neglect radiation, transpiration cooling (sweating), and the effects of clothing.
GIVEN
• Human body idealized as a vertical cylinder in still air
• Diameter (D) = 30 cm = 0.3 m
• Height (L) = 1.8 m
• Skin temperature (Ts) = 2°C below normal body temperature (37°C) = 35°C FIND
• Heat loss (q) and compare to consumption of food 4.325 MJ/day
ASSUMPTIONS
• Steady state
• Radiation, transpiration cooling, and clothing effects are negligible
• Ambient air temperature (T?) = 20°C
• Heat loss from the top of the cylinder is small compared to that from the sides
SKETCH
PROPERTIES AND CONSTANTS
for dry air at the mean temperature of 27.5°C
Thermal expansion coefficient (?) = 0.00333 1/°C
Thermal conductivity (k) = 0.0257 W/(m K)
Kinematic viscosity (?) = 16.4 × 10–6 m2/s
Prandtl number (Pr) = 0.71
Which of the following is not a vector quantity?
A) velocity B) speed C) acceleration D) all are vector quantities E) none are vector quantities.
In the two-slit experiment, for the condition of dark fringes, the value of m = +1 corresponds to a path difference of 3?/2
Indicate whether the statement is true or false
A free electron and a free proton are released in identical electric fields. Compare the magnitudes of their accelerations
1.It is millions of times greater for the electron. 2.It is thousands of times greater for the electron. 3.They are equal. 4.It is thousands of times smaller for the electron. 5.It is millions of times smaller for the electron.