If experimental results for heat transfer over a flat plate with an extremely rough surface were found to be correlated by an expression of the form nu, 0.04 re09 pr3 hx and re k where nu v the air flowing over the surface has a temperature of 290 k, a velocity of 10 m/s, and the surface has a length of 1 m and a surface area of 1 m2. just enough energy is supplied to maintain the wall's steady state temperature at 310 k (a) determine the average heat transfer coefficient ()over the flat plate surface, in w/m2-k. (15%) (10%) (b) determine the rate of heat must be supplied to the surface for these conditions, in w. hints: air (at tmean = 300 k, 1 atm): v = 15.89 x 106 m2/s; kf= 0.0263 w/m-k; pr 0.7.

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the temperature in kelvin of 2.0 dm3 of an ideal gas is doubled and its pressure is increased by a factor of four. what is the final volume of the gas

d. platinum would have the greatest temperature increase because it has the lowest specific heat.

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

                                              ⇒      

here   k is the proportionality constant whose value is 1.

                                                            [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.