SPH4U Final Course Summative

____ 1. A football player successfully kicks a field goal through the uprights situated at the south end of the stadium. What are the directions of the instantaneous velocity and acceleration, respectively, of the football at the peak of its trajectory? a. south, south d. south, up b. up, south e. down, down c. south, down ____ 2. A bus drives 40.0 km [E] from town A to town B, then another 30.0 km [S] to town C in a total time of 1.00 h. What are the values of its average speed and average velocity, respectively? a. 70.0 km/h, 70.0 km/h [37º S of E] d. 50.0 km/h, 70.0 km/h [37º S of E] b. 70.0 km/h, 50.0 km/h [37º S of E] e. 50.0 km/h [37º S of E], 70.0 km/h c. 50.0 km/h, 50.0 km/h [37º S of E] ____ 3. In an emergency braking exercise, a student driver stops a car travelling at 83 km/h [W] in a time of 4.0 s. What is the car’s acceleration during this time? (The answer is expressed in units of m/s2.) a. 5.8 [W] d. 21 [W] b. 21 [E] e. –5.8 [E] c. 5.8 [E] ____ 4. The free-body diagram of a wagon being pulled along a horizontal surface is best represented by a. A d. D b. B e. E c. C ____ 5. A 24-kg traffic light is suspended from the midpoint of a cable suspended between two poles. The angle between the cable and the pole is 80° at both poles. The net force acting on the traffic light has a value of a. zero d. 2.4 ´ 102 N b. 47 N e. 4.6 ´ 102 N c. 82 N ____ 6. An object is pushed horizontally at a constant velocity. What can correctly be said about the forces acting on the object? a. The force(s) acting forward is/are greater than the force(s) acting backward. b. The sum of all forces has a value directed forward. c. The sum of all forces is zero. d. The forces acting on the object can be said to be “unbalanced.” e. Newton’s second law best summarizes the effect of the forces acting on the object. ____ 7. A 2.0-kg object is pulled horizontally by a force of 6.3 N along the floor where the coefficient of kinetic friction is 0.24. What is the object’s acceleration? a. 5.5 m/s2 d. 1.6 m/s2 b. 2.0 m/s2 e. 0.80 m/s2 c. 2.0 m/s2 ____ 8. A 75-kg parachutist jumps from a plane at a height of 1.2 km. At the instant he leaves the plane, his gravitational potential energy compared to the plane is a. 8.8 ´ 102 J d. –8.8 ´ 105 J b. –8.8 ´ 103 J e. 0J c. 8.8 ´ 105 J ____ 9. A student has 474 J of gravitational energy while standing on a stool 0.84 m above the ground. The mass of the student is a. 5.8 ´ 102 kg d. 40 kg (to two significant digits) b. 48 kg e. 60 kg (to two significant digits) c. 58 kg ____ 10. A 1.30-kg pendulum bob is pulled to the side, raising it 19.0 cm above its rest position. After it is released, the maximum speed will be a. 0.616 m/s d. 6.16 m/s b. 1.93 m/s e. 37.2 m/s c. 3.72 m/s ____ 11. A boy throws a 15-kg ball at 4.7 m/s to a 65-kg girl who is stationary and standing on a skateboard. After catching the ball, the girl is travelling at a. 0 m/s d. 3.2 m/s b. 0.88 m/s e. 4.7 m/s c. 1.1 m/s ____ 12. A moving curling stone, A, collides head on with a stationary stone, B. Both stones are of identical mass. If friction is negligible during this linear elastic collision, a. stone A will slow down b. after the collision, the momentum of stone B will be less than that of stone A c. both stones will come to rest shortly after the collision d. after the collision, the kinetic energy of the stone B will be less than that of stone A e. after the collision, stone A will have a speed of zero ____ 13. Kepler’s constant for the Sun is CS = 3.4 ´ 1018 m3/s2. The average period of orbit for Earth is 365.26 d. The average radius of Earth’s orbit is a. 7.7 ´ 107 km d. 1.5 ´ 1011 m b. 3.4 ´ 109 m e. 5.8 ´ 1016 m c. 1.8 ´ 1010 m ____ 14. A planet being orbited by a satellite collapses to half its original radius while maintaining the same mass. The period of orbit will increase by a factor of a. 0.35 d. 2.0 b. 0.50 e. 2.8 c. 1.0 ____ 15. An object with charge +q experiences an electric force FE when put in a particular location in the electric field . The positive charge +q is removed and an object with charge –4q is placed in the same location in the electric field. This charge would feel an electric force of a. –2FE d. –4FE b. e. c. ____ 16. A positively charged particle of mass 3.0 ´ 10–12 kg and charge +6.4 ´ 10–5 C is perpendicular to a 1.5-T magnetic field. If the particle has a speed of 4.8 ´ 103 m/s, the acceleration of this particle is a. 3.4 ´ 10–4 m/s2 d. 1.5 ´ 10–4 m/s2 b. 2.6 ´ 10–20 m/s2 e. 1.7 ´ 1019 m/s2 c. 1.5 ´ 1011 m/s2 ____ 17. A wave travelling along a spring with a wavelength of 2.0 m enters a second spring where the wavelength becomes 3.0 m. If the speed in the first spring was 4.4 m/s, the speed of the wave in the second spring is a. 0.73 m/s d. 4.4 m/s b. 2.2 m/s e. 6.6 m/s c. 2.9 m/s ____ 18. A thin, transparent coating is placed on a lens in order to reduce the reflection of the green component of white light. The lens is made of plastic with an index of refraction of 1.65 and the film has an index of refraction of 1.35. To minimize the reflected green light, the minimum thickness of the film, in terms of the wavelength of the light in the film, is a. b. c. much less than d. e. greater than ____ 19. A computer can make a calculation in 0.25m s. If the computer is in a ship moving at 0.95c, how long will each calculation take relative to Earth? a. 0.80 m s d. 0.18 m s b. 0.24 m s e. 0.08 m s c. 0.26 m s ____ 20. The momentum of a photon with a wavelength of 635 nm is a. 4.21 ´ 10–40 kg·m/s d. 1.04 ´ 10–36 kg·m/s b. 1.04 ´ 10–27 kg·m/s e. 4.21 ´ 10–31 kg·m/s c. 9.57 ´ 1026 kg·m/s