# Degrees, angles and forces, physics homework help

1. How long is a pendulum with a  period of 1.0 s on a planet with twice the gravity of the earth?

2. A spring has a spring constant of 100 N/m, and the mass hanging on it is 2.0 kg. What is period of the springs motion?

3. Which force produces the largest torque?

20.0 N perpendicular to the center of rotation at a radius of 0.5 m

20.0 N perpendicular to the center of rotation at a radius of 1.0 m

10.0 N perpendicular to the center of rotation at a radius of 0.25 m

10.0 N perpendicular to the center of rotation at a radius of 1.5 m

4. An outfielder throws a baseball to home plate with a velocity of +15 m/s and an angle of 40(degrees). When will the ball reach its highest altitude?

5. A 0.90 m wide door turns though an angle of 45(degrees). How long is the arc of the displacement?

6. Which racing on a flat track, a car rounds a curve of 56 m radius and instantaneously experiences a centripetal acceleration of 36 m/s^2. How fast was the car going?