If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

High school physics

Unit 7: Lesson 6

Angular momentum and angular impulse

Angular impulse calculations

You might need: Calculator

Problem

A boat's propeller has a rotational inertia of 4, point, 0, start text, k, g, end text, dot, start text, m, end text, squared. After a constant clockwise torque is applied for 12, start text, s, end text, the propeller's angular speed changes from a clockwise 6, point, 0, start fraction, start text, r, a, d, end text, divided by, start text, s, end text, end fraction to a clockwise 18, start fraction, start text, r, a, d, end text, divided by, start text, s, end text, end fraction.
What was the torque applied to the propeller?
Answer using a coordinate system where counterclockwise is positive.
start text, N, end text, dot, start text, m, end text
Stuck?
Stuck?