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The surface area of a person is 1.9m2 and the skin temperature is 31°C. What are the rates of heat transfer through the skin when there is almost no blood flow to the skin and when there is maximum blood flow to the skin?
A closed vessel made of brass 4mm thick ,has a surface area 0•2m^2 and contains 5×10^-3m^3 of hot water.calculate the Temperature difference which exists between the inside and outside surfaces of the brass vessel if the water is cooling at 1kelvin per second?
The mean free path of an oxygen molecule is 2.0 x 10-5 m, when the gas is at a pressure of 120 Pa and a temperature of 275 K. The atomic mass of oxygen is 16.0 g/mol. Calculate the radius of an oxygen molecule
- A. 0.22 nm.
- B. 0.10 nm.
- C. 0.30 nm.
- D. 1.2nm
- E. None of the above.
Calculate the mean free path of a gas of randomly-moving hard spheres of 2 nanometer radius, when the density of spheres is 3.00 x 1019 per cubic meter.
- A. 1.17 × 10-4 m
- B. 9.76 × 10-5 m
- C. 4.70 × 10-4 m
- D. 1.88 × 10-3 m
- E. None of the above.
By how much would you need to heat a 3 meters bar of zinc to make it expand by 5 cm?
Four forces act on a point 150 gm SE, 300 gm due S 60° W . 280 gm due W
and 180 gm 60° S of E. (a) What single force will replace the four forces? (b) What
single force (called the equilibrant) would balance the four forces? Solve algebraically
*A 20°C a steel ball has a diameter of 0.7cm while the diameter of a hole in a aluminum plate is 0.699cm at what temperature the same for both will the ball just pass through the hole?*
Linear expansivity of steel 11e-6
Linear expansivity of aluminum 23e-6
Calculate the number of joules given off when 32.0 grams of steam cools from 110.0 °C to ice at -40.0 °C.
What is the force when an object exerts 20 Pa pressure on a square surface of side 12m?
A thermometer contains 3.00 g of mercury. After it gains 8.4 J of energy the mercury has reached the 5.00°C mark. What was the initial temperature of the mercury?
