The wheel, rotating at uniformly accelerated speed, after a time t = 1 min after the start of rotation, acquires a frequency of n = 720 rpm. Find the angular acceleration ɛ of the wheel and the number of revolutions N of the wheel during this time.

Adolphin emits ultrasound at 100khz and uses the timing of reflections to determine the position of objects in the water. part a what is the wavelength of this ultrasound? assume that temperature of water is 20 degrees c. answer in cm

A51 kg woman skis down a hill and her kinetic energy is 9.96e4 j. what is her speed?

Which of the following conditions lead you to see an absorption line spectrum from a cloud of gas in interstellar space? the cloud is extremely hot. the cloud is visible primarily because it reflects light from nearby stars. the cloud is cool and lies between you and a hot star. the cloud is cool and very dense, so that you cannot see any objects that lie behind it.