Module 3 Unit Test Physics 1401 Question 1 A 100 kg cannon at rest contains a 10 kg cannon ball When fired the cannon ball leaves the cannon with a speed of 90 m s What is the recoil speed of the cannon Select one A 4 5 m s B 90 m s C zero m s D 45 m s E 9 m s Question 2 A 2 kg stone falls 100 meters near the surface of the earth It strikes the ground without any rebound thereby making a completely inelastic collision with the earth Approximately how much kinetic energy is transferred to the earth in this process Select one A zero joules B 200 J C 2000 J D 10 000 J E 20 000 J Question 3 A 66 N m torque acts on a wheel with a moment of inertia 175 kg m2 If the wheel starts from rest how long will it take the wheel to make one revolution Select one A 0 37 s B 0 71 s C 5 8 s D 6 9 s E 2 4 s Question 4 A spring required a force of 5 0 N to compress it 0 1 m How much work is required to stretch the spring 0 4 m Select one A 4 J B 0 8 J C 0 4 J D 0 6 J E 2 J Question 5 A stunt person jumps from the roof of a tall building but no injury occurs because the person lands on a large air filled bag Which one of the following best describes why no injury occurs Select one A The bag increases the amount of time during which the momentum is changing and reduces the average force on the person B The bag provides the necessary force to stop the person C The bag decreases the amount of time during which the momentum is changing and reduces the average force on the person D The bag increases the amount of time the force acts on the person and reduces the change in momentum E The bag reduces the impulse to the person Question 6 An airplane is traveling at 225 m s when it strikes a weather balloon m 1 82 kg which can be considered to be at rest relative to the ground below After the collision the balloon is caught on the fuselage and is traveling with the airplane The collision takes place over a time interval of 4 44 10 3 N What is the average force that the balloon exerts on the airplane during the collision Select one A 5 07 106 N B 9 22 104 N C 4 61 105 N D 2 78 104 N E 415 N Question 7 In which one of the following situations is linear momentum not conserved Select one A An astronaut floating in space throws a hammer away and subsequently moves in the opposite direction B A tree limb is struck by lightning and falls to the ground C A golf ball is struck by a club D A bomb suspended by a string explodes into one hundred fragments E A bowling ball collides with a set of ten pins Question 8 A car has a head on collision with another car of the same momentum An identical car driving with the same speed as the first car runs into an enormously massive wall The greets impulse will occur on the car that is in the collision with the Select one a approaching car b both impulses will be the same c wall Question 9 Compared to a recoiling rifle the bullet fired has a greater Select one a kinetic energy b momentum c none of these Question 10 A heavy truck and a small truck roll down a hill Neglecting friction at the bottom of the hill the heavy truck will have greater Select one a all of these b acceleration c momentum d none of these e speed Question 11 Consider a hydraulic press When the input piston is depressed 20 cm the output piston is observed to move 1 cm On the same press an input force of 1N can raise Select one a 1 N b 10 N c 20 N d more than 20 N Question 12 A person in good physical condition can put out 100 W of useful power for several hours at a stretch perhaps by pedaling a mechanism that drives an electric generator Neglecting any problems of generator efficiency and practical considerations such as resting time How many people would it take to run a 2 00 kW electric clothes dryer Answer 20 Question 13 In an ice show a 40 0 kg skater leaps into the air and is caught by an initially stationary 70 0 kg skater What is their final velocity m s assuming negligible friction and that the leaper s original horizontal velocity was 4 00 m s Answer 1 45 Question 14 When tightening a bolt you push perpendicularly on a wrench with a force of 165 N at a distance of 0 140 m from the center of the bolt How much torque are you exerting in N m relative to the center of the bolt Answer 23 1
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