Physics for Scientists and Engineers
6th Edition
ISBN: 9781429281843
Author: Tipler
Publisher: MAC HIGHER
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Chapter 12, Problem 63P
To determine
The coefficient of friction if the box is to slide.
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A cubical box is filled with sand and weighs 890 N. We wish to “roll" the box by pushing
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the center of gravity of the crate is at a height of 3.5ft and a distance 1.5ft from the forward edge as shown. the crate weighs 300lbf. what is the maximum coefficient of friction μ between the ground and the crate, to be able to slide the crate without tipping it over
A flexible cable as shown in the figure which supports the 100-kg load passed over a fixed circular drum and subjected to a force P to maintain equilibrium. The coeficient of static friction between the cable and the fixed drum is 0.30. For P = 500 N, determine the minimum value which the angle a may have before the load begins to slip.
Chapter 12 Solutions
Physics for Scientists and Engineers
Ch. 12 - Prob. 1PCh. 12 - Prob. 2PCh. 12 - Prob. 3PCh. 12 - Prob. 4PCh. 12 - Prob. 5PCh. 12 - Prob. 6PCh. 12 - Prob. 7PCh. 12 - Prob. 8PCh. 12 - Prob. 9PCh. 12 - Prob. 10P
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- A uniform meter stick of weight W is held by a thumb pushing down at the 0-cm line and by fingers pushing up at the 5-cm line. What are both forces on the meter stick, the force of the thumb T and the force of the fingers F?arrow_forwardA rectangular block twice as high as it is wide is resting on a board. The coefficient of static friction between board and incline is 0.63. If the board’s inclination angle is gradually increased, will the block first tip over or first begin sliding?arrow_forwardThe upper end of a wide-skid W 8 × 21 steel column (E = 30 × 103 ksi) is supported laterally between two tubes (see figure). The tubes are not attached to the column and the friction between the tubes and the column is not reliable. The base of the column provides fixed support and the column is 13 ft long. Determine the critical load for the column, consider the Euler buckling in the web plane and also perpendicular to the web plane.arrow_forward
- A box with a uniform mass of 50 kg is supported on a surfaceflat, when a force P is applied to it, as shown in the figure. The coefficient of dynamic friction between the box and the surface is 0.2. Determine the acceleration of the box. Further,confirm that the box is sliding and not tipping.arrow_forwardClimbers attempting to cross a stream place a 340-kg log against a vertical, frictionless ice cliff on the opposite side (as illustrated in the Figure below). The log slopes up at 27 degrees and its center of gravity is one-third of the way along its 6.3-m length (as marked in the Figure). If the coefficient of friction of the log and the ground is 0.92, what’s the maximum mass of climber and pack to cross without the log slipping?arrow_forwardh L GAS A 45.0 kg sign hangs at the end of a bar where L = 3.10 meters in length. A cable attaches to the end of the horizontal bar and to a wall 2.70 meters above where the bar is attached to the wall. The bar has a mass of 13-kg. What is the tension in the cable? Give your answer in Newtons to 3 significant figures (no decimal places in this case).arrow_forward
- a 8-53.. A lantern of weight W is suspended at the end horizontal bar of weight w and length L that is supported by a cable that makes an angle with the side of a vertical wall. Assume the weight of the bar is at its center. (a) Derive an equation for the tension in the cable. (b) Calculate the tension in the cable for a bar of weight 28 N and length 1.5 m, plus a lantern of weight 85 N, and the cable making a 37° angle to the vertical. 40² Darrow_forwardIn a science fiction story about space exploration an expedition to Mars was described. The space shiplanded in a rocky valley and the astronauts promptly prepared their vehicle for a trip on the planet surface.This special vehicle was designed with big inflated tires. On the very first steep slope the vehicle tippedover. They did have small steel balls onboard to increase traction. They thought of suspending a bunch ofthem beneath the vehicle to lower its centre of gravity, but that would decrease the clearance and cause theweights to strike rocks and the ground more often. What can they do? Provide your answer with a briefexplanation of a potential solution.arrow_forwardIn 1967 Mercedes-Benz presented their new steep-bank track with a maximum bank angle of 90 degrees to the horizontal as shown below. At that time they were testing the “new” SEC450 model that has a track width of 1.5m and its center of gravity lies midway between the wheels. The center of gravity is 0.75 meters above the horizontal and the coefficient of friction between the tyres and the road surface is 0.7under dry conditions.Determine the following:a) The maximum speed in km/h at which this car could round an unbanked bend of 75 meters radiusb) The angle to the horizontal the driver must bank to ensure “no-side slip” conditions at a speed of 60 km/hc) If the driver moves up the incline to 15 degrees to the horizontal, determine the speed at which the car in (a) above would now skid in this bend.arrow_forward
- Determine the reaction at the smooth wall. The top of the 15kg ladder is leaning against a very smooth wall. Assume that the mass cebter of the painter is directly above his feet and that the coefficient of friction between the horizontal ground and the ladder is 0.25.arrow_forwardOne end of a uniform meter stick is placed against a vertical wall. The other end is held by a lightweight cord that makes an angle ? with the stick. The coefficient of static friction between the end of the meter stick and the wall is 0.400. What is the maximum value thetheta can have if the stick is to remain in equilibrium?arrow_forwardA 25-kg ladder, 4 m long, rests on a rough floor and against a vertical wall. The ladder makes an angle of 35° with the horizontal. It starts to slip when a man weighing 75 kg has dlimbed halfway up. f= 0.20 at the wall. Ladder Wall 350 10) What is the coefficient of friction at the floor in three decimal places?arrow_forward
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