and the floor. c The applied pulling force is steadily increased. Just before the box moves forward, the 144.0 N. Determine the maximum coefficient of friction between the box and the surface. 4. The same box is being pulled by a force, F, at an angle, 0, above the horizontal, across a rough surface at a constant velocity. a Draw a free-body diagram of the box. b. Identify the forces acting on the box in the x- and y-axes. c Will the frictional force increase or decrease as 8 is increased from 0° to 45°? Explain your reasoning. lid materials, write a procedure for how fiction. Be sure to

and the floor. c The applied pulling force is steadily increased. Just before the box moves forward, the 144.0 N. Determine the maximum coefficient of friction between the box and the surface. 4. The same box is being pulled by a force, F, at an angle, 0, above the horizontal, across a rough surface at a constant velocity. a Draw a free-body diagram of the box. b. Identify the forces acting on the box in the x- and y-axes. c Will the frictional force increase or decrease as 8 is increased from 0° to 45°? Explain your reasoning. lid materials, write a procedure for how fiction. Be sure to

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter4: Dynamics: Force And Newton's Laws Of Motion

Section: Chapter Questions

Problem 28PE: Commercial airplanes are sometimes pushed out of the passenger loading area by a tractor. (a) An...

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(a) A car with a mass of 850 kg is moving to the right with a constant speed of 1.44 m/s. What is the total force on the car? (b) What is the total force on the car if it is moving to the left?
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A car of mass 875 kg is traveling 30.0 m/s when the driver applies the brakes, which lock the wheels. The car skids for 5.60 s in the positive x-direction before coming to rest. (a) What is the cars acceleration? (b) What magnitude force acted on the car during this time? (c) How far did the car travel?
Two small forces, F1=2.40i6.10tj N and F2=8.50i9.70j N , are exerted on a rogue asteroid by a pair of space tractors. (a) Find the net force. (b) What are the magnitude and direction of the net force? (c) If the mass of the asteroid is 125 kg, what acceleration does it experience (in vector form)? (d) What are the magnitude and direction of the acceleration?
(a) Why does an ordinary rifle recoil (kick backward) when fired? (b) The barrel of a recoilless rifle is open at both ends. Describe how Newton’s third law applies when one is fired. (c) Can you safely stand close behind one when it is fired?
Commercial airplanes are sometimes pushed out of the passenger loading area by a tractor. (a) An 1800-kg tractor exerts a force of 1.75104 N backward on the pavement, and the system experiences forces resisting motion that total 2400 N. If the acceleration is 0. 150 m/s2, what is the mass of the airplane? (b) Calculate the force exerted by the tractor on the airplane, assuming 2200 N of the friction is experienced by the airplane. (c) Draw two sketches showing the systems of interest used to solve each part, including the free-body diagrams for each.
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A worker is attempting to lift a 55.0-kg palette of bricks resting on the ground by means of a rope attached to a pulley. a. Before the worker pulls on the rope, what is the force exerted by the ground on the palette? b. The worker exerts a force of 295 N downward on his end of the rope. What is the force exerted by the ground on the palette? c. If the worker doubles the downward force, what is the force exerted by the ground on the palette?
(a) A cat with a mass of 850 kg in moving to the right with a constant speed of 1.44 m/s. What is the total force on the cat ? (b) What is the total force on the cat if it is moving to the left?
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