thin walled tank having a total surface area of 150m2 contains 0.8m3 water at 350K. It is Lagged with 150mm Layer of material of thermal conductivity of 4x10^-2W/mK The temperature of the outside surface of the thin walled is 290K what electrical power be applied to an immersion heater to maintain the temperature of 350K (assume the thickness of the walls to be negligible) If the heater were switched off, how long would it take for the temperature of the hot water to fall to lK. (Specific heat capacity of water is 41707J/kgK, density of water is 1000kg/m3)

mass and volume are the answers you are looking for

i think its c if i'm wrong

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.