Example 10 Three boxes are hung from a pulley system as shown in the following diagram. If box A has a mass of 25 kg, box B has a mass of 40 kg, and box C has a mass of 35 kg, what is the acceleration of the boxes? (cord can't be stretched, frictionless pulley, Both cord and pulley have negligible mass) B с

Example 10 Three boxes are hung from a pulley system as shown in the following diagram. If box A has a mass of 25 kg, box B has a mass of 40 kg, and box C has a mass of 35 kg, what is the acceleration of the boxes? (cord can't be stretched, frictionless pulley, Both cord and pulley have negligible mass) B с

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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A person pushes a box with a small constant force to move the box along the floor at a constant speed in a straight-line path. Which of the following statements is true? a. The net force on the box is zero. b. There are no other forces on the box (besides the person’s push.) c. The net force on the box must be greater than zero to keep the box moving. d. The box has an acceleration that is not zero. e. [Both (c) and (d) are true.]
The following object has a mass of 5.2 kg. Determine the acceleration of the object. a. 11 m/s^2 left b. 13 m/s^2 left c. 10 m/s^2 left d. 12 m/s^2 left
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QUESTION 6 A box rests on a desk. A student gives the box a short push to the left. A few seconds after the push, the box is still moving to the left, but is now slowing down. (Assume that the student is no longer touching the box for the rest of the problem) a. What direction do the velocity and acceleration of the box point? Explain your answers. b. What forces affect the box? List the type (normal/friction/gravity), which object is causing each force, and the direction of each force. c. Is the box in equilibrium? Explain. T T TT
Imagine a situation that a truck gives a car a steady push over some distance. Here m1 > m2 and v1 = v2. Assume the car is in park and the wheels of the car are locked so that it is hard to push. Which object will experience the largest force at the following instants after the initial contact? a. as the truck dtarts to push b. as the car accelerates c. As the truck and car move at constant speed
A block released from rest at position A slides with negligible friction down an inclined track, around a vertical loop, and then along a horizontal portion of the track, as shown above. The block never leaves the track. Which of the following is true of the net force on the block when it is at position C? A. It is directed vertically downward only. B. It is directed vertically upward only. C. It is directed to the left only. D. It is directed to the right only. E. It has components both to the left and vertically downward.
Rectilinear Motion The 250 lb concrete block A is released from rest in the position shown and pulls the 400 lb log up the 30° ramp. If the coefficient of kinetic friction between the log and the ramp is 0.5, determine the velocity of the block as it hits the ground at B. Ans. 15.27 ft/s 3. 400 lb 30° HA=0.5 20 250 lb B
Problem 16 You can measure acceleration by measuring the deflection of a vertically hanging mass. Suppose an air freshener hangs from the rear view mirror of your car, which is initially at rest. You hit the gas pedal and notice that the air freshener is deflected at an angle of 15 degrees from the vertical. What is your car's acceleration?
Q3/ An object accelerates 3.0 m/s when a force of 6.0 N is applied to it. What is the mass of the object?
5. The largest pumpkin ever grown had a mass of 2702 pounds (2021 world record). Suppose you want to push a pumpkin with this mass up a smooth ramp that is 6.00 m long and that makes a 30.0° angle with the horizontal. If you push the squash with a force of 6250 N up the incline, what is a. the net force exerted on the squash (x and y)? b. the net acceleration of the squash? c. the time required for the squash to reach the top of the ramp?
2. An incline plane with friction making an angle of 30 degrees with the horizontal has a pulley at its top. A 30-kg block on the plane is connected to a freely hanging 20-kg block by means of a cord passing over a pulley. Initially the block is at rest when the cord is suddenly cut. M1 M, On the diagram below, show all the applied forces on the blocks when it moves up the plane. а. b. Determine the normal force applied on the block by the surface. С. Find the coefficient of friction. d. Find the acceleration of the block after the cord is cut? е. If there was no friction find the Tension Force at the cord before it was cut.