Physics for Scientists and Engineers: Foundations and Connections
1st Edition
ISBN: 9781133939146
Author: Katz, Debora M.
Publisher: Cengage Learning
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Chapter 5, Problem 76PQ
Jamal and Dayo are lifting a large chest, weighing 207 lb, by using the two rope handles attached to either side. As they lift and hold it up so that it is motionless, each handle makes a different angle with respect to the vertical side of the chest (Fig. P5.76). If the angle between Jamal’s handle and the vertical side is 25.0° and the angle between Dayo’s handle and the vertical side of the chest is 30.0°, what are the tensions in each handle?
FIGURE P5.76
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consider a force vector = 300 g at the 40º angle. resolve this vector into its x- and y-components by the following methods: a) graphical: make the x- and y-axes. use a scale of 30 g = 1.0 cm, and draw an arrow of appropriate length at 40º. drop perpendiculars from the tip of the vector to the x- and y-axes. measure the lengths of these lines and hence find the magnitudes of fx and fy. (do not calculate using trigonometry) record the results. b) analytical: compute the magnitudes of fx and fy by using the component method (equations 3-3 and 3-4). record the results.
Ross and Rachel are fighting if they were on a break. Ross
is trying to get his stuff weighing 150. N placed on an
inclined plane by pulling it upwards parallel to the inclined
plane with 150. N force. However, Rachel is trying to stop
Ross by exerting 50.0 N perpendicular to the inclined
plane. The coefficients of friction between the box and the
incline are us = 0.450 and uk = 0.350.
Rachel was able to stop Ross. The object is in static equilibrium.
Rachel wins. The object is impending to move up.
Nobody wins; the object slides down to the plane.
Ross was able to get the object. The object slides up along the incline.
50 N
F·R·I·E·N·D·S
30°
Was Ross able to get the object or was Rachel able to stop him?
(Ctrl)-
150 N
A climbing anchor consists of two strands of nylon webbing clipped to bolts in the rock. The webbing is clipped into the rope at the other end, with the webbing making angles of 22° and 35° with the vertical. What is the tension in each of the webbing strands if the combined mass of the rope and climber is 85 kg?
Chapter 5 Solutions
Physics for Scientists and Engineers: Foundations and Connections
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- You are trying to move a light fixture into an apartment. There are hooks in the elevator so you hang the fixture on a hook with a chain. You don't want the fixture to touch the walls, so you attach a rope to the side that pulls horizontally as shown, keeping the fixture stationary with respect to the elevator. Note theta =38∘. As the elevator ascends vertically, the magnitude of the tension force in the chain from the elevator on the fixture as a function of the vertical position of the elevator, y, is Fcf(y)=F_0*e^-y/y1 where F_0=167 N and y1=3.3 m. Using the fixture as your system, if the elevator goes from y=0 to y=5.94m, what is the work done by the tension force in the chain on the fixture?arrow_forwardRoss and Rachel are fighting if they were on a break. Ross is trying to get his stuff weighing 150. N placed on an inclined plane by pulling it upwards parallel to the inclined plane with 150. N force. However, Rachel is trying to stop Ross by exerting 50.0 N perpendicular to the inclined plane. The coefficients of friction between the box and the incline are us = 0.450 and uk = 0.350. 50 N 53.4 N 75.0 N 20.1 N 100.0 N F·R·I·E·N·D·S 30⁰° 150 N Which of the following is closest to the magnitude of the ACTUAL frictional force between the object and the incline at the instant shown?arrow_forwardYou are working for a shipping company. Your job is to stand at the bottom of an 8.0-m-long ramp that is inclined at above the horizontal. You grab packages off a conveyor belt and propel them up the ramp. The coefficient of kinetic friction between the packages and the ramp is uk =0.30. What is the angle of the inclined ramp?arrow_forward
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