Physics 3rd 6weeks – 3week Test

Study Guide and Review 2016-17

Name: ______

Period: ____ Teacher: ______

1. Change each of the following into radians?

  1. 360° ______
  2. 0° ______
  3. 180° ______
  4. 90° ______

2. Mars has an equatorial radius of approximately 3396 km. and it rotates 360° every 24.7 h. What is the angular speed of Mars in radians per hour?

Givens Equation Solution

3. A point on the rim of a 0.30 m radius rotating wheel has a tangential speed of 6.0 m/s. What is the tangential speed of a point 0.40 m from the center of the same wheel?

Givens Equation Solution

4. A ball is thrown straight up at a speed of 40.0 m/s. What is the acceleration of the ball at the top, at the middle of the flight and at the bottom of the flight?

ANS:______

5. A ball is thrown straight up at a speed of 40.0 m/s. How long does it take to return to its starting point?

Givens Equation Solution

6. A stone falls freely from a cliff for 4.5 seconds. How high is the cliff?

Givens Equation Solution

7. A stone falls freely from a cliff for 4.0 seconds. What is the velocity at the bottom?

Givens Equation Solution

8. A wheel with a radius of 0.7 m rotates at a constant angular speed of 7.5 rad/s. What is the tangential speed of a point 0.4 m from the wheel’s axis?

Givens Equation Solution

9. A stone on the edge of the tire of a unicycle wheel with a radius of 0.3 m has a centripetal acceleration of 5.0 m/s2. What is the tire’s angular speed(omega)?

Givens Equation Solution

10. A toy car is moving at a constant speed of 7.2 m/s along the track pictured here. What is the car’s centripetal acceleration as it rounds the curve at the large end of the track?

Givens Equation Solution

11. If the toy car is 1.5 kg what is the centripetal force as it rounds the second curve(2.1m)?

Givens Equation Solution

12. Two small masses that are 10.0 cm apart attract each other with a force of 10.0 N. When they are 15.0 cm apart, these masses will attract each other with what force?(G = 6.673 x 10-11 N m2/kg2)

Givens Equation Solution

13. Centripetal force and acceleration is always to the ______. Draw a circle with the radius force vector and tangential velocity vectors clearly labeled.

14. A 81 kg student sits at a desk 2 m away from a 50.0 kg student. What is the magnitude of the gravitational force between the two students?(G = 6.673 x 10-11 N*m2/kg2)

Givens Equation Solution

15. What is the centripetal acceleration of a point on the perimeter of a bicycle wheel of diameter 0.70 m when the bike is moving 16.0 m/s?

Givens Equation Solution

16. What force is needed to make an object move in a circle? ______

17. Draw the acceleration vs time, velocity vs time and distance vs time graphs below for an object that is thrown straight up in the air.

18. a. Which of the following is the correct tangent velocity path of a rock thrown out of a sling-shot? Ans:______

b. If the rock’s mass is 10kg and the radius is 0.5m and vt is 5m/s what is the centripetal force of the rock?

Givens Equation Solution

19. a. You are orbiting planet x. When the distance between you and the planet center doubles, the gravitational force ______

b. Which of the following does not change no matter what planet you are on?

Mass, Velocity, Acceleration, Gravity, Weight

20. A cave dweller rotates a pebble in a sling with a radius of 0.40 m counterclockwise through an arc length of 1.96 m. What is the angular displacement of the pebble?

Givens Equation Solution

21. A helicopter has 3.0 m long rotor blades that are rotating at an angular speed of 83 rad/s. What is the tangential speed of each blade tip?

Givens Equation Solution

22.A student swings a stopper attached to a string around their head with a radius of 0.40m at a constant angular velocity. The force on the string is 12N and the mass of the stopper is 0.14kg. What is the tangent velocity of the stopper?

Givens Equation Solution