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In a bad dream, you are naked in outer space. You only emit radiation, as there is little or none to absorb from your environment. Your skin acts like a blackbody at the infrared wavelengths that it radiates, and your body's surface area is about 2 m2. Estimate the following:
(a) the temperature and area of your skin,
(b) the rate at which energy is emitted by your body,
(c) the kilocalories of energy (1 kcal=1 food Calorie) emitted by your skin per day,
(d) the number of milkshakes (each containing about 400 kcal of energy) that you would have to drink per day in order to compensate for the energy lost from your skin.
(e) Why do you suppose it is biologically advantageous for the blood vessels in your skin to constrict when your environment is cold?
a downward force of 98 n acts on the free end of the illustrated pulley. ma 47 kg what is block as acceleration?
a well-insulated rigid tank contains 5 kg of a saturated liquid-vapor mixture of water at 150 kpa. initially
Refer to the circuit shown in Figure 27-2. Assume that the HOA switch is in the Hand position and that the motor is running. Now assume that OL2 opens its contacts. Would this stop the operation of the fan motor? Explain your answer.
an 8-in. id 20.32 cm pipe is connected by means of a reducer to a 6-in id pipe. kerosene flows throught the system at
Using just a 5-gallon bucket and a 3-gallon bucket, can you put four gallons of water in the 5-gallon bucket? (Assume that you have an unlimited supply of water and that there are no measurement markings of any kind on the buckets.)
The top pulleys of a Weston differential pulley block have diameters of 210 and 190 mm. Determine the effort required to raise a load of 150 kg if the efficiency of the system is 35%
a campaign sign weighing 68 pounds is suspended from the middle of a cable stretched across a street between two
Calculate the maximum bending stress in a W530×101 steel beam that spans 13 m on simple supports and supports two equal concentrated loads of 54 kN each.
Water flows through the pipe shown in Fig. P8.91. Determine the net tension in the bolts if minor losses are neglected and the wheels on which the pipe rests are frictionless.
Discuss the condition of the water still in the bag and the reason for that condition. Base your discussion on topics that have been covered in this course so far.
Two spur gears are in mesh. Driven gear 3 has a magnitude of rotational speed that is one half that of the driver gear 2. Gear two rotates at 500 rpm , has a module of 3 mm and has 48 teeth. Determine 1) The number of teeth on gear 3, 2) The magni..
A 90-kg man and a 60-kg woman stand at opposite ends of a 150-kg boat, ready to dive, each with a 5-m/s velocity relative to the boat. Determine the velocity of the boat after they have both dived, if (a) the woman dives first, (b) the man dives firs..
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