Homework Help: physics

Posted by Jordan on Sunday, October 24, 2010 at 12:16pm.

An electric drill starts from rest and rotates with a constant angular acceleration. After the drill has rotated through a certain angle, the magnitude of the centripetal acceleration of a point on the drill is twice the magnitude of the tangential acceleration. What is the angle?

physics - drwls, Sunday, October 24, 2010 at 12:38pm
w = a*t where a is the angular acceleration, in rad/s^2, and t is the time since it started to accelerate

R w^2 = R*(a*t)^2 = 2 R*a

R cancels out. a^2* t^2 = 2a

t = sqrt (2/a)

I cannot provide a numerical value without knowing the acceleration rate.

Answer this Question

Related Questions

physics - A dentist's drill starts from rest. After 3.62 s of constant ...
Physics - A dentist's drill starts from rest. After 3.20 s of constant ...
Physics - A dentist's drill starts from rest. After 3.00 s of constant ...
physics - A dentist's drill starts from rest. After 2.50 s of constant ...
Physics - A dentist's drill starts from rest. After 3.30 s of constant ...
Physics - A dentist's drill starts from rest. After 3.30 s of constant ...
physics - 1. A 10.0 g object moving to the right at 25.0 cm/s makes an elastic ...
Physics - a dentists drill starts from rest. after 5.39 seconds of constant ...
physics - a wheel starts from rest and rotates with a constant angular ...
Physics! - A wheel rotates with a constant angular acceleration of 3.50 rad/s2. ...

For Further Reading

First Name:
School Subject:
Answer: