Question

1)A dentist causes the bit of a high-speed drill to accelerate from an angular speed of 1.30 × 10⁴ rad/s to an angular speed of 3.14 × 10⁴ rad/s. In the process, the bit turns through 1.94 × 10⁴ rad. Assuming a constant angular acceleration, how long would it take the bit to reach its maximum speed of 7.85 × 10⁴ rad/s, starting from rest?

2)It takes a force of 80.0 N to compress the spring of a toy popgun 0.15 m to "load" a 0.15 kg ball. With what speed will the ball leave the gun?

Answer 1