Large, cylindrical bales of hay used to feed livestock in the winter months are d = 2 m in diameter and are stored end-to-end in long rows. microbial energy generation occurs in the hay and can be excessive if the farmer bales the hay in a too-wet condition. assuming the thermal conductivity of baled hay to be k = 0.04 w/m · k, determine the maximum steady-state hay temperature for dry hay (q˙=1 w/m3), moist hay (q˙=10 w/m3), and wet hay (q˙=100 w/m3). ambient conditions are t[infinity] = 0°c and h = 25 w/m2 · k.

v=ir = 3x15 =45 v

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.