Posted by Hannah on Thursday, June 7, 2012 at 4:57pm.
A dentist causes the bit of a highspeed drill to accelerate from an angular speed of 1.44 x 104 rad/s to an angular speed of 5.05 x 104 rad/s. In the process, the bit turns through 1.77 x 104 rad. Assuming a constant angular acceleration, how long would it take the bit to reach its maximum speed of 8.95 x 104 rad/s, starting from rest?
Do I start by subtracting the two angular speeds?

Physics(Please help)  Elena, Thursday, June 7, 2012 at 5:29pm
ω=ωₒ+ε•t,
t= (ωωₒ)/ε……..(1).
Plug (1) in following
φ =ωₒ•t +ε•t²= (ω²ω²ₒ)/2•ε .
ε= (ω²ω²ₒ)/2• φ =(25.52.07) •10^8/2•1.77•10^4 =6,32•10^4 rad/s²
Now,
ω1=ωₒ+ε•t1,
t1 = (ω1ωₒ)/ ε =(8.950) •10^4/ 6,32•10^4 =1.42 s.
Answer This Question
Related Questions
 physics  A dentist causes the bit of a highspeed drill to accelerate from an ...
 Physics  A dentist causes the bit of a highspeed drill to accelerate from an ...
 Physics  A dentist causes the bit of a highspeed drill to accelerate from an ...
 physics  A dentist's drill starts from rest. After 2.50 s of constant angular ...
 Physics  A dentist's drill starts from rest. After 3.30 s of constant angular ...
 Angular acceleration  A flywheel of 480 mm diameter is accelerated with an ...
 Physics  A dentist's drill starts from rest. After 3.30 s of constant angular ...
 Physics  Your electric drill rotates initially at 5.11 rad/s. You slide the ...
 Physics  A bicycle starts at the origin of a circular track that has a ...
 physics  A machine part rotates at an angular speed of 0.38 rad/s; its speed is...
More Related Questions