Tham khảo tài liệu 'sat ii physics (gary graff) episode 1 part 2', ngoại ngữ, ngữ pháp tiếng anh phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | DIAGNOSTIC ItSI PHYSICS TEST Continued 21. A father holds his child on his shoulders during a parade. The father does no work during the parade because A no force acts on the child. B the momentum of the child is constant. C the potential energy of the child is gravitational. D the child s kinetic energy is constant. E the child s distance from the ground remains the same. 22. Golden Glove boxers who are amateurs use larger more padded gloves than professional boxers use. The amateur boxers are more protected from injury because A the larger glove exerts a larger impulse on the boxer. B the larger glove exerts a larger force on the boxer. C the larger glove exerts more energy on the boxer. D the larger glove increases time of impact on the boxer. E the larger glove increases the power exerted on the boxer. 23. The driver of an automobile traveling at 80 km hr locks his brakes and skids to a stop in order to avoid hitting a deer in the road. If the driver had been traveling at 40 km hr how much faster would he have stopped A 4 times the distance B 2 times the distance C 1 the distance 2 D 1 the distance 4 E Not enough information to tell 24. During a laboratory experiment a pile driver is dropped 2 m on to the head of a nail which is driven cm into a wood board. The frictional force exerted by the wood on the nail is A B 165N C 1600N D 1960N E 3200N 25. For question 24 above what is the magnitude of the acceleration of the pile driver while it drives the nail into the board A -165 m s2 B -800 m s2 C -1600 m s2 D -2000 m s2 E -3200 m s2 26. A child is swinging on a swing set. As the child reaches the lowest point in her swing A the tension in the rope is equal to her weight. B the tension in the rope supplies a centrifugal force. C her kinetic energy is at maximum. D her tangential acceleration equals gravity. E her angular velocity is minimum. 27. A bicycle wheel spins on its axis at a constant rate but has not yet made a complete rotation. Which .
