A source of sound of frequency of 512hz emits a frequency of wavelength 64.5cm in aur at 20degree celsius. what would be the velocity of sound at 0 degree celsius

Amachinist turns the power on to a grinding wheel, at rest, at time t = 0 s. the wheel accelerates uniformly for 10 s and reaches the operating angular velocity of 96 rad/s. the wheel is run at that angular velocity for 40 s and then power is shut off. the wheel slows down uniformly at 1.5 rad/s2 until the wheel stops. in this situation, the time interval of deceleration is closest to:

The force needed to overcome static friction is usually less than that needed to overcome kinetic friction.true or false?

As the distance from a magnet increases, what happens to the magnet force?