Worksheet 2

Physics 1100 Sample Test 2 October 22, 20021. A hunter on an ATV pulls a 750 kg moose carcase out of horizontal bog. The ATVproduces a steady horizontal 5000 N pull on the moose and moves at a constant 5 km/h..Calculate the coefficient of kinetic friction of between the bog and moose?2. A 4.0 kg block is pulled along a horizontal surface. The tension in the pulling string is7.0 N at 35.0° below the horizontal.a. What is the normal force exerted on the block?b. If the coefficient of kinetic friction is 0.15, then what is the acceleration?3. A 10.0 kg wagon is pulled along a level floor by a 30 N force directed at 70° above thehorizontal. The wagon’s horizontal acceleration is 0.52 m/s 2 . Determine the coefficientof rolling friction. Hint: rolling friction is mathematically the same as sliding friction.4. A 48.0 kg person decides to measure their weight on an elevator accelerating downwardat 1.25 m/s 2 . What does the Newton scale read?5. Bart fires a 250-g crossbow bolt (arrow) upward at an angle of 53° (this is the slope ofthe surface). Initially the bolt is at rest and it leaves the crossbow with a velocity of 70m/s. The crossbow is 60.0 cm long and has a k of 0.47. What is the average forceneeded to launch the bolt?6. A trawl is pulled up the 75° ramp ( s= 0.50 and k = 0.30) on the back ofa fishing boat. The cables pulling thenet up the ramp are parallel to thesurface and effectively apply 15000N of tension. If the net is raised witha constant velocity, then what is themass of the trawl and fish?7. The diagram shows a pulley system that cangently lowers or raises the boat out of the water.This system starts from rest. Although the truck’spark brake is on, it still slides. Determine:a. The system velocity after 3.0 seconds.b. The tension in the connecting string.

8. Which way would this system attempt to move? What is the acceleration of thissystem and the tension in the connecting wires, assuming it is in motion in itsnatural direction?M1 = 12.0 kgM2 = 9.0 kgM3 = 8.0 kg k1 = 0.10 k2 = 0.059. Answer the following for this system:a. Which way the system would try to move?b. Does the initially resting system spontaneouslymoves?c. If, for whatever reason, it were moving in itsdesired direction, what is the acceleration ofthe system?d. What is the tension in the connecting string?M1 = 15.0 kgM2 = 10.0 kgs 2 = 0.10 k1 = 0.0310. A jet fighter makes a horizontal arc of 3.0 km radius at 827 m/s. Calculate the centripetalforce on the 72 kg pilot11. A Ferris wheel traveling at a uniform speed 5.0 m/s makes you feel weightless at the topof the ride. What is the diameter of the wheel? What is your apparent weight at thebottom if your mass is 50.0 kg?12. In the “Barrels of Fun” ride at an amusement park people are spun around a horizontalcircle at a steady speed. Then the floor drops out of the ride. However, the people do notfall because of the static friction between them and the vertical walls.Given the ride has a diameter of 6.0 metres and spins at 90 rpm, determine the coefficientof static friction.13. What is the normal force on a 100 kg astronaut standing on a level plain on Venus, if themass of Venus is 4.87 x 10 24 kg and the diameter is 6.65 x 10 6 m?14. What is the orbital speed of a satellite that has a stable orbit 200 km above the ocean?