Physics Review
1. Resonance occurs in a tube of air closed at one end when the tube is 16.8 cm long and the frequency is 500 Hz. The speed of sound is _____ m/s. Round and record your three-digit value.
2. Refer to multiple-choice question 1. The speed of the satellite in scientific notation, is b x 10w m/s. The value of b is _____. Round and record your three-digit value.
3. Snoopy is flying his Sopwith Camel in a vertical loop. He hopes to have a radius of 720 m. The minimum speed the plane must have in order to complete the loop (and not fall out of the sky) is _____ m/s. Round and record your three-digit value.
4. A 12.4 kg lead sphere is placed near a 45.7 kg lead sphere. If the gravitational force between the two is 8.95 x 10-8 N, the distance between the centers of the spheres is _____ m. Round and record your three-digit value.
6. Two forces act on an object. A 110 N force pull toward 127o, a 98.0 N force pulls at 310o. Ignoring friction, what is the magnitude and direction of the net force acting on the object?
7. A boat that can travel at 2.5 m/s is on river flowing at 2.0 m/s. Determine the velocity of the boat relative to the shore if the boat is aimed straight across the river.
8. If the river in question 7 is 112 m wide, how much time is needed to cross the river?
9. A ball is thrown horizontally at 10.0 m/s from the top of a 90.0 m tall building. Calculate the distance from the base of the building that the object will hit the ground.
10. A 1.5 kg object is given a push so that its initial velocity is 1.4 m/s west. The object slides to stop after moving 0.25 m. What is the coefficient of friction?
11. Three forces act on an object. Force A has a magnitude of 80.0 N and acts at 60.0o. Force B is 70.0 N at 0.00o. Force C is 40.0 N at 315o. What is the magnitude and direction of the resultant?
12. A 1500 kg car is moving at 60 km/h when its brakes are applied and the car skids to a stop. If the force of friction is about 1.1 x 104 N, how far does the car travel before coming to a stop?
13. A child is pulling her 8.2 kg wagon with a force of 20 N. If the handle of the wagon is at an angle of 36o to the horizontal, determine the acceleration of the wagon.
14. A gravitational force of 1.45 x 10-7 N acts between two objects when they are 1.56 m apart. If one mass is 3.00 kg, the mass of the other object is ____ kg.
15. A satellite is in orbit above Earth at a distance of 7.15 x 106 m from the centre of Earth. Calculate the period of its orbit.
16. Determine the weight of a 50.0 kg person on the surface of Ganymede (m=1.48 x 1023 kg, r = 2634 km), one of the moons of Jupiter.