Groups

Tools$/$Communication

MyGrades

Student Email

Student Tutorial

Purchase Course Materials

An ultracentrifuge accelerates from rest to $100,000rpm$ in $2\mathrm{.}00$ min $.$

$($a$)$ What is its angular acceleration in $ra\frac{d}{s^2}?$

$($b$)$ What is the tangential acceleration of a point $9\mathrm{.}50$ cm from the axis of rotation?

$($c$)$ What is the radial acceleration in $\frac{m}{s^2}$ and multiples of $g$ of this point at full rpm $?$

During the spin$-$dry cycle of a washing machine, the motor slows from $95ra\frac{d}{s}$ to $30ra\frac{d}{s}$ while turning the drum through an angle of $402$ radians. What is the magnitude of the angular acceleration of the motor?

A grindstone of radius $4\mathrm{.}0$ m is initially spinning with an angular speed of $8\mathrm{.}0ra\frac{d}{s}.$ The angular speed is then increased to $10ra\frac{d}{s}$ over the next $4\mathrm{.}0$ seconds. Assume that the angular acceleration is constant.

$($a$)$ What is the average angular speed of the grindstone?

$($b$)$ What is the magnitude of the angular acceleration of the grindstone?