............Q2 please.......... Practice1. A 0.170 kg hockey puck is initially moving at 21.2 m/s [W] along the ice. The coefficientof kinetic friction for the puck and the ice is 0.005.(a) What is the speed of the puck after travelling 58.5 m? [ans: 21.1 m/s](b) After being played on for a while, the ice becomes rougher and the coefficient ofkinetic friction increases to 0.047. How far will the puck travel if its initial and finalspeeds are the same as before? [ans: 6.24 m]2. A snowmobile is used to pull two sleds across the ice. The mass of the snowmobile andthe rider is 320 kg. The mass of the first sled behind the snowmobile is 120 kg and themass of the second sled is 140 kg. The ground exerts a force of 1500 N [forward] onthe snowmobile. The coefficient of kinetic friction for the sleds on ice is 0.15. Assumethat no other frictional forces act on the snowmobile. Calculate the acceleration of thesnowmobile and sleds. [ans: 1.9 m/s² [forward]]3. A string is tied to a 3.2 kg object on a table and a 1.5 kg object hanging over a pulley(Figure 12). The coefficient of kinetic friction between the 3.2 kg object and the table is0.30. ™A(a) Calculate the acceleration of each object. [ans: 1.1 m/s² [R]; 1.1 m/s² [down]](b) Determine the magnitude of the tension in the string. [ans: 13 N]3.2 kg(c) How far will the objects move in 1.2 s if the initial velocity of the 3.2 kg object is1.3 m/s [right]? [ans: 2.4 m]4. An electric motor is used to pull a 125 kg box across a floor using a long cable. Thetension in the cable is 350 N and the box accelerates at 1.2 m/s² [forward] for 5.0 s. Figure 12The cable breaks and the box slows down and stops. ™C(a) Calculate the coefficient of kinetic friction. [ans: 0.16](b) How far does the box travel up to the moment the cable breaks? [ans: 15 m](c) How far does the box travel from the moment the cable breaks until it stops? [ans: 11 m]pulley1.5 kg

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Description: ............Q2 please.......... Practice1. A 0.170 kg hockey puck is initially moving at 21.2 m/s [W] along the ice. The coefficientof kinetic friction for the puck and the ice is 0.005.(a) What is the speed of the puck after travelling 58.5 m? [ans:

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2. A snowmobile is used to pull two sleds across the ice. The mass of the snowmobile and the rider is 320 kg. The mass of the first sled behind the snowmobile is 120 kg and the mass of the second sled is 140 kg. The ground exerts a force of 1500 N [forward] on the snowmobile. The coefficient of kinetic friction for the sleds on ice is 0.15. Assume that no other frictional forces act on the snowmobile. Calculate the acceleration of the snowmobile and sleds. [ans: 1.9 m/s² [forward]

2. A snowmobile is used to pull two sleds across the ice. The mass of the snowmobile and the rider is 320 kg. The mass of the first sled behind the snowmobile is 120 kg and the mass of the second sled is 140 kg. The ground exerts a force of 1500 N [forward] on the snowmobile. The coefficient of kinetic friction for the sleds on ice is 0.15. Assume that no other frictional forces act on the snowmobile. Calculate the acceleration of the snowmobile and sleds. [ans: 1.9 m/s² [forward]

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter6: Applications Of Newton’s Laws Of Motion

Section: Chapter Questions

Problem 61PQ: A car with a mass of 1453 kg is rolling along a flat stretch of road and eventually comes to a stop...

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1. A 0.170 kg hockey puck is initially moving at 21.2 m/s [W] along the ice. The coefficient of kinetic friction for the puck and the ice is 0.005. ™/ (a) What is the speed of the puck after travelling 58.5 m? [ans: 21.1 m/s] (b) After being played on for a while, the ice becomes rougher and the coefficient of kinetic friction increases to 0.047. How far will the puck travel if its initial and final speeds are the same as before? [ans: 6.24 m]
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