You have a (disk-shaped) grindstone with a mass of 100 kg and a radius of 0.32 m. initially, it is turning at 150 rpm. you press a steel axe head against the grindstone with a radial force of 40 n to sharpen it. calculate the torque acting on it.

Answer: it will take   4.36 seconds to reach her average velocity 10.69 miles/hour.explanation:   we have equation of motion ,where s is the displacement, a is the acceleration, u is the initial velocity and t is the time taken.average velocity = displacement/ time taken.average velocity = 10.69 miles/hr = 10.69*1.6*1000/(60*60) = 4.75 m/s4.75 = s/ts = 4. 1we also have acceleration = 2.18 m/s², initial velocity = 0 m/sso it will take   4.36 seconds to reach her average velocity 10.69 miles/hour.