Consider a situation where two moving objects collide, stick to each other, and move off together. The energy of a ball rolling up an inclined plane is an example of both kinetic and gravitational potential energy
Indicate whether the statement is true or false
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An opaque gray surface having reflectivity of 0.5 at 27ºC is exposed to irradiation of 1000 W/m^2. Air at 7ºC flows over the surface and the convective heat transfer coefficient is 15 W/m^2K. Determine the net heat transfer per unit area from the surface.
What will be an ideal response?
If you are driving at 30 miles per hour and increase your speed to 60 miles per hour, you quadruple your kinetic energy
Indicate whether the statement is true or false
In a large chemical factory, hot gases at 2273 K are cooled by a liquid at 373 K with gas side and liquid side convection heat transfer coefficients of 50 and 1000 W/(m2 K), respectively. The wall that separates the gas and liquid streams is composed of 2-cm thick slab of stainless steel on the liquid side. There is a contact resistance between the oxide layer and the steel of 0.05 m2.K/W. Determine the rate of heat loss from hot gases through the composite wall to the liquid.
GIVEN
FIND
Rate of heat loss from hot gases through composite wall to liquid.
ASSUMPTIONS
- 1 Dimensional steady state heat transfer
- Thermal conductivity remain constant.
- Radiation is negligible.
SKETCH
Specific heat capacity of ice = 2,000 J/kg-°C latent heat of fusion of water = 334,000 J/kg specific heat capacity of water = 4,000 J/kg-°C As the ice is melting, the temperature of the ice-water mixture rises by __________
Fill in the blank(s) with correct word