Awheel with rotational inertia 0.04 kg. m 2 io and radius 0.02 m is turning at the rate of 10 revolutions per second when a frictional torque is applied to stop it. how much work is done by the torque in stopping the wheel?
(a) -0.0008 j
(b) -0.4tj
(c) -2 j c
(d) -22 j
(e) -82j

potential energy is directly proportional to height.

more height = more potential energy.

greatest increase in height = greatest increase in potential energy

where are the points with the greatest increase in height ?

has to be c-e or d-e .

radiation warms things up temp rises convection currents air circ windy weather

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.