A lawn mower has a flat, rod-shaped steel blade that rotates about its center. The mass of the blade is
0.65 kg and its length is 0.55 m. What is the rotational energy of the blade at its operating angular speed of 3450 rpm ?
Express your answer using two significant figures.
Part B
If all of the rotational kinetic energy of the blade could be converted to gravitational potential energy, to what height would
the blade rise?
Express your answer using two significant figures.

multiply 2kg by latent heat of vap

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.

it is b. absorbs thermal energy