L5F10112 SEBOEIE . A car is driven at 50 km/h [N] for 0.5 h, and then at 100 km/h [W] for 0.25 h. Which statement is true? a. The average velocity of the car is 80 km/h [NW]. b. The average velocity of the car is 70 km/h [NW]. c. The average velocity of the car is 50 km/h [NW]. d. The average velocity of the car cannot be determined. . A book is at rest on a desk. Which statement is true? The normal force balances the force of gravity. The normal force and gravity both point downwards. Gravity is the only force acting on the book. The normal force is the only force acting on the book. Which statement is true about Newton's Laws of Motion? a. They consist of three separate statements. b. They explain how and why objects move or stay at rest. 0. They describe the forces that objects exert on each other. d. all of the above . An object is on a rotating table, rotating with the table, as shown. A FBD drawn by a student is shown. What needs to be done to correct the FBD? The FBD is correct. The centripetal force pointing to the centre of the circle must be added. The centripetal force pointing outward from the circle must be added. The force of static friction should be the force of kinetic friction. L5F10113 3E 30 131%: Where were roller coasters rst built? a. Russia b. the United States of America c. Germany (1. Switzerland Two objects in motion have the same kinetic energy. The mass of one object is half the mass of the other. What is the ratio of their speeds? a. 8:1 b. J5 :1 0. 4:1 d. 2:1 Water owing through a large dam and hydro generating plant is an example of a. kinetic energy. b. chemical energy. 0. potential energy. d. fusion energy. A block of mass 20 kg is travelling left at a speed of 2.0 m/s when it hits a spring placed horizontally as shown. If the spring constant is 500.0 N/m, calculate the maximum compression of the spring. a. 3.9 cm b. 4.0 cm 0 0.20 cm (1 none of the above Modern tennis players are able to hit the ball with greater speed than was possible with older wooden tennis racquets. This is due to tennis balls of greater mass. greater muscle development of players. more contact time between the ball and the racquet. changes in the rules of tennis. L5F101'13 3E 30 Big: 10. Two carts each with mass 1.2 kg are on a frictionless track. The rst cart travelling at 3.0 m/s collides with the second stationary cart. The two carts latch together and continue rolling down the track. The velocity of the carts is now a. 3.0 m/s. b. 4.2 m/s. c. 3.6 m/s. (1 1.5 m/s. cLawrence Academy 2021 Leading Wave Nexus Inc. ID:A A 0.400 kg physics cart is moving with a velocity of 0.22 m/s. This cart collides inelastically with a second stationary cart and the two move off together with a velocity of 0.16 m/s. What was the mass of the second cart? a. 0.15 kg b. 0.400 kg c. 0.29 kg d. none of these What is true about the gravitational constant, G? a. It is believed to be the same everywhere in the universe. b. It applies only near the surface of Earth. c. It applies only within the gravitational eld of the Sun. (1. It applies only within the gravitational eld of the Milky Way galaxy. Which ofthe following is The correct eauaflon Tor fe sneeH or a satellite in orbit around Earth? :5F10113 3E30EIIE ?-46%I 13. Which of the following is the correct equation for the speed of a satellite in orbit around Earth? GmE a. v: r b _GmE . V 2 r GmE c v: r d _ GmE . V 2 r 14. Which statement is true? a. All protons carry the same amount of negative charge. b. Like charges repel and unlike charges attract. c. All electrons carry the same amount of positive charge. (1. All of these. 15. Mass spectrometers have many uses. What is an example of such a use? a. to dene the elemental composition of a sample or molecule b. to determine the mass of a particle c. to reveal the chemical structure of a molecule (1. all of these 16. A thin lm of oil on water has an index of refraction of 1.50. Red light of wavelength 600 nm strikes the surface of the oil. What is the wavelength of the light that refracts into the oil? a. 900 nm /\\ b. 600 nm c. 500 nm E d. 400 nm 18 V :5F10113 3E30EIIE ?-46%I 17. An asteroid is travelling towards Earth at 0.00010. A light beam from Earth is tracking the asteroid. What is the speed of light using the asteroid as a frame of reference? a. 0.00010 b. 0.99990 c. c (1. 1.00010 _ 18. What is the relativistic mass of a 6 mg object travelling at 0.86? a. 1 mg b. 10 mg c. 1 kg d. 10 kg 19. Which of the following statements is correct? a. Particles show interference effects. b. Waves do not show interference effects. c. Particles deliver energy in discrete quantities. d. Particles deliver energy continuously over time. Ranges for the wavelengths of visible light are given in the table below. 6.25 x 10'7 to 7.40 x 10'7 5.90 X 107 to 6.25 X 107 5.65 X 10\"7 to 5.90 x 10'7 A 5.20 X 107 to 5.65 X 107 4 5.00 x 107 to 5.20 X 10-7 / 4.35 X 107 to 5.00 X 107 '8 3.80>