A circular disk (like a CD, wheel, or galaxy disk), starting from rest, rotates with an angular acceleration given by a = (2 + 6t) rad/s?
a. Derive the expression for the angular speed as a function of time.
b. Derive the expression for the angle the wheel turns through a function of time.
c. Determine a, w and angular displacement att = 3 s.
d. If the disk has a radius of 3 m, determine the linear speed, and the radial, and tangential
components of the linear acceleration of a point on the rim of the disk at t=3 s.

In which scenario is the least amount of work done on a crate? a force of 120 n moves it 25 m. a force of 115 n moves it 26 m. a force of 130 n moves it 22 m. a force of 125 n moves it 27 m.

The a metal retainer that keeps the rolling elements evenly spaced. n a. seal n b. separator n c. bearing n d outer race

As part of your daily workout, you lie on your back and push with your feet against a platform attached to two stiff springs arranged side by side so that they are parallel to each other. when you push the platform, you compress the springs. you do an amount of work of 79.0 j when you compress the springs a distance of 0.230 m from their uncompressed length. (a) what magnitude of force must you apply to hold the platform in this position? (b)how much additional work must you do to move the platform a distance 0.230 m farther? (c) what maximum force must you apply to move the platform a distance 0.230 m farther?