Physics 76 Questions Chapter 11 With Correct Answers
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Course
Physics
Institution
Physics
100 g of liquid nitrogen at its boiling point of 77 K is stirred into a beaker containing 500 g of 15°C water. If the nitrogen leaves the solution as soon as it turns to gas, how much water freezes? The heat of vaporization of nitrogen is 48 cal/g and that of water is 80 cal/g. - ️️none
A met...
100 g of liquid nitrogen at its boiling point of 77 K is stirred into a beaker
containing 500 g of 15°C water. If the nitrogen leaves the solution as soon as it
turns to gas, how much water freezes? The heat of vaporization of nitrogen is
48 cal/g and that of water is 80 cal/g. - ✔ ✔ none
A metal bar is used to conduct heat. When the temperature at one end is 100°C
and at the other is 20°C, heat is transferred at a rate of 16 J/s. If the
temperature of the hotter end is reduced to 80°C, what will be the rate of heat
transfer? - ✔ ✔ 12 J/s
A metal bar is used to conduct heat. When the temperature at one end is 100°C
and at the other is 20°C, heat is transferred at a rate of 16 J/s. The bar is then
stretched uniformly to twice its original length. If again it has ends at 100°C
and 20°C, at what rate will heat be transferred between it ends? - ✔ ✔
4 J/s
A piece of copper of mass 100 g is being drilled through with a 1/2" electric
drill. The drill operates at 40.0 W and takes 30.0 s to bore through the copper.
If all the energy from the drill heats the copper, find the copper's increase in
temperature. ccopper = 387 J/kg×°C - ✔ ✔ 31.0 degrees C
A puddle holds 150 g of water. If 0.50 g of water evaporates from the surface,
what is the approximate temperature change of the remaining water? (Lv =
540 cal/g) - ✔ ✔ -1.8 degrees C
, A silver bar of length 30 cm and cross-sectional area 1.0 cm2 is used to
transfer heat from a 100°C reservoir to a 0°C block of ice. How much ice is
melted per second? (For silver, k = 427 J/s×m×°C. For ice, Lf = 334 000 J/kg.) -
✔ ✔ 0.043 g/s
A slice of bread contains about 100 kcal. If specific heat of a person were 1.00
kcal/kg•°C, by how many °C would the temperature of a 70.0-kg person
increase if all the energy in the bread were converted to heat? - ✔ ✔
1.43 degrees C
A solar heated house loses about 5.4 ´ 107 cal through its outer surfaces on a
typical 24-h winter day. What mass of storage rock is needed to provide this
amount of heat if it is brought up to initial temperature of 62°C by the solar
collectors and the house is maintained at 20°C? (Specific heat of rock is 0.21
cal/g×°C. - ✔ ✔ 6100 kg
A solar heating system has a 25.0% conversion efficiency; the solar radiation
incident on the panels is 1 000 W/m2. What is the increase in temperature of
30.0 kg of water in a 1.00-h period by a 4.00-m2-area collector? (cw = 4 186
J/kg×°C) - ✔ ✔ 28.7 degrees C
Which of the following produces greenhouse gases? - ✔ ✔ all of the
above
Which of the following statements is true? - ✔ ✔ Objects do not contain
heat.
Which one of the following processes of heat transfer requires the presence
of a fluid? - ✔ ✔ convection
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