Module #3 – Unit TestPhysics 1401 Question 1A 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/sB. 90 m/sC. zero m/sD. 45 m/sE. 9 m/s Question 2A 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 JC. 2000 JD. 10 000 JE. 20 000 JQuestion 3A 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 sB. 0.71 sC. 5.8 s D. 6.9 sE. 2.4 sQuestion 4A 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 JC. 0.4 JD. 0.6 JE. 2 JQuestion 5A 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 thechange in momentum.E. The bag reduces the impulse to the person.Question 6An 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 forcethat the balloon exerts on the airplane during the collision?Select one:A. 5.07 × 106 NB. 9.22 × 104 N C. 4.61 × 105 ND. 2.78 × 104 NE. 415 NQuestion 7In 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 8A 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 theSelect one:a. approaching carb. ...both impulses will be the same. c. wallQuestion 9Compared to a recoiling rifle, the bullet fired has a greater Select one:a. kinetic energy b. momentumc. none of theseQuestion 10A heavy truck and a small truck roll down a hill. Neglecting friction, at the bottom of the hill, the heavy truck will have greaterSelect one:a. all of theseb. accelerationc. momentum d. none of thesee. speedQuestion 11Consider 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 raiseSelect one:a. 1 Nb. 10 Nc. 20 N d. more than 20 NQuestion 12A 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:20Question 13In 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:1.45Question 14When 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
View Full Document
Unlocking...