Acomputer disk drive is turned on starting from the rest and has constant angular acceleration how long did it take to make the first complete rotation and what is the angular acceleration given that the disk took 0.750 second for the drive to make it second complete regulation

Aballet student who learns with the of his instructor is demonstrating learning.

It's a snowy day and you're pulling a friend along a level road on a sled. you've both been taking physics, so she asks what you think the coefficient of friction between the sled and the snow is. you've been walking at a steady 1.5m/s, and the rope pulls up on the sled at a 32 ∘ angle. you estimate that the mass of the sled, with your friend on it, is 65 kg and that you're pulling with a force of 80 n .

Awave has a wavelength of 7 mm and a frequency of 19 hertz. what is its speed?