A bear sling, Fig. 4–40, is used in some national parks forplacing backpackers' food out of the reach of bears. As thebackpacker raises the pack by pulling down on the rope, theforce F needed:(a) decreases as the pack rises until the rope is straightacross.(b) doesn't change.(c) increases until the rope is straight.(d) increases but the rope always sags where the packhangs.FFIGURE 4–40MisConceptualQuestion 4.

A bear sling is used in some national parks for placing backpacker’s food out of the reach of bears.

Answered: A bear sling, Fig. 4–40, is used in…

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 16 b a m₂ = 2.00 kg. 37 Two blocks are connected by a string and are pulled vertically upward by a force of 165 N applied to the upper block, as shown in Fig. 4-42. (a) Find the tension 7 in the string connecting the blocks. (b) If the blocks start from rest, what is their velocity after having moved a distance of 10.0 cm? F 165 N 2.00 kg U T M 1.00 kg Fig. 4-42 I ✩ E AA
(1) Two 100-N weights are attached to a spring scale as shown. Does the scale read o, 100 N, or 200 N, or does it give some other reading? )) 100N 100N
‚A 500-kg block is resting on a 30° inclined plane with f = 0.30. Find the required force P acting horizontally that will prevent the block from sliding.
5. (BONUS) Two blocks are connecting by a non-stretchable string. The smooth inclined surface make an angle of 35° with the horizontal. The pulley is assumed to be massless with no friction. If mass of block A is 1.2 kg and mass of block B is 1.5 kg, what is the magnitude of acceleration of each block?
IS A) 171 N (B)262 N C) 387 N D) 398 N Do only two 16 – 18 only. 16)A 30.0-kg block is being pulled up a 25.0° slope by a force of 575 N which is parallel to the slope, but the block does not slide up the slope. What is the minimum value of the coefficient of static friction required for this to happen? | us = 575-30 x 9.8 Sin25° + Ox cos cOsZ %3D 9860 eSこ 7.51
A truck is traveling horizontally to the right (Fig. 4–-38). When the truck starts to slow down, the crate on the (frictionless) truck bed starts to slide. In what direction could the net force be on the crate? (a) No direction. The net force is zero. (b) Straight down (because of gravity). (c) Straight up (the normal force). (d) Horizontal and to the right. (e) Horizontal and to the left. FIGURE 4–38 MisConceptual Question 1.
1. (1) How much tension must a rope withstand if it is used to accelerate a 960-kg car horizontally along a frictionless surface at 1.20 m/s?? 0.5 MarE Chapter 4 3, 12, 36, 40 0.5 Mark
11. (II) A 20.0-kg box rests on a table. (a) What is the weight of the box and the normal force acting on it? (b) A 10.0-kg box is placed on top of the 20.0-kg box, as shown in Fig. 4–43. Determine the normal force that the table exerts on the 20.0-kg box and the normal force that the 20.0-kg box exerts on the 10.0-kg box. 10.0 kg 20.0 kg FIGURE 4–43 Problem 11.
5. (II) A 20.0-kg box rests on a table. (a) What is the weight of the box and the normal force acting on it? (b) A 10.0-kg box is placed on top of the 20.0-kg box, as shown in Fig. 4-38. Determine the normal force that the table exerts on the 20.0-kg box and the normal force that the 20.0-kg box exerts on the 10.0-kg box. 10.0 kg 20.0 kg FIGURE 4-38 Problem 5.
2) Dallas is on her ATV when she gets stuck in the mud. The only way she can get out is if a helicopter gives it a pull. With one side of the rope secured around a tree, determine the tension P in the rope needed to pull Dallas' ATV up the incline at an acceleration of 3 ft/s?. Assume that both angles are equal to e = 30°, the weight of the ATV is 500 Ib, and the kinetic coefficient of friction between the ATV and the ground is 0.30. %3D P Hx = 0.3
The mass of a car is 1000 kg. The total opposing force for the moving car is 10 % of theweight of the car. Calculate the net force needed to move the car, if it is movingwith constant speed a) on a flat road, b) upwards on an incline of 5 °.with acceleration of 2.0 m/s2 on c) a flat road, d) downwards on an incline of 5 °.
(II) Figure 4–45 shows a block (mass ma) on a smooth hori- zontal surface, connected by a thin cord that passes over a pulley to a second block (mB), which hangs vertically. (a) Draw a free-body diagram for each block, showing the force of gravity on each, the force (tension) exerted by the cord, and any normal force. (b) Apply Newton's second law to find formulas for the acceleration of the system and for the tension in the cord. Ignore friction and the masses of the pulley and cord. FIGURE 4-45 Problems 51, 52, and 53. Mass m rests on a smooth horizontal surface, mg hangs vertically. mg

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