Physics for Scientists and Engineers, Vol. 1
6th Edition
ISBN: 9781429201322
Author: Paul A. Tipler, Gene Mosca
Publisher: Macmillan Higher Education
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Chapter 5, Problem 67P
To determine
To Find: The value of constant b in the air drag force expression.
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A 4.00 kg box sits atop a 10.0 kg box on a horizontal table. The coefficient of kinetic friction between the two boxes and the lower box and table is 0.600, while the coefficient of static frction between these same surfaces is 0.800. A horizontal pull of 150.0 N to the right is exerted on the lower box, and the boxes move together. What is the friction force on the upper box?
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Chapter 5 Solutions
Physics for Scientists and Engineers, Vol. 1
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- An early submersible craft for deep-sea exploration was raised and lowered by a cable from a ship. When the craft was stationary, the tension in the cable was 6500 N. When the craft was lowered or raised at a steady rate, the motion through the water added an 1800 N drag force. What was the tension in the cable when the craft was being lowered to the seafloor?arrow_forwardRunning on a treadmill is slightly easier than running outside because there is no drag force to work against. Suppose a 60 kg runner completes a 5.0 km race in 19 minutes. The density of air is 1.20 kg/m3 Determine the drag force on the runner during the race. Suppose that the runner has the cross section area of 0.72 m2 and the drag coefficient of 1.2. What is this force as a fraction of the runner's weight?arrow_forwardA spherical raindrop of mass 0.0128 g and radius 1.45 mm falls from a cloud that is at a height of 1139 m above the ground. Assume the drag coefficient for the raindrop is 0.60 and the density of the air is 1.3 kg/m3. What is the raindrop's terminal speed? And what would the raindrop's speed just before landing on the ground if therewere no drag force (no air resistance)?arrow_forward
- A constant force Fa pushes a 22.5-kg box across a rough horizontal surface. The magnitude of Fa is 185 N and the force is inclined at an angle of θ = 30.0° below the horizontal. The coefficient of kinetic friction between the box and the surface is μk = 0.500. What is the magnitude of the box's acceleration?arrow_forwarda 45kg gymnast wedges himself between two closely spaced vertical walls by pressing his hands and feet against the walls. What is the magnitude of the friction force on each hand and foot? Assume they are all equal. Express your answer with the appropriate units.arrow_forwardIn the Wall of Death carnival attraction, stunt motorcyclists ride around the inside of a large, 10-m-diameter wooden cylinder that has vertical walls. The coefficient of static friction between the riders’ tires and the wall is 0.90. What is the minimum speed at which the motorcyclists can ride without slipping down the wall?arrow_forward
- A woman holds a book by placing it between her hands such that she presses at right angles to the front and back covers. The book has a mass of m = 1.7 kg and the coefficient of static friction between her hand and the book is μs = 0.53. What is the weight of the book, Fgb in Newtons? What is the minimum force she must apply with each of her hands, Fmin in Newtons, to keep the book from falling?arrow_forwardA 22 kg loudspeaker is suspended 2.4 m below the ceiling by two 2.70 m long cables that angle outward at equal angles. What is the tension in each of the cables?arrow_forwardA football coach sits on a sled while two of his players build their strength by dragging the sled across the field with ropes. The friction force on the sled is 1400 N and the angle between the two ropes is 50 ●. Assume both players pull with the same force. How hard must each player pull to drag the coach at a steady 2.0 m/s?arrow_forward
- It is autumn. You look outside a window and see a maple leaf falling face down, in a straight vertical line. You estimate the speed of the leaf to be 25.77 cm/s. You then pick up the leaf and do measurements. It has a mass of 2.76 g and a cross sectional area of 76 square cm. You measure the density of air to be 1.298 kg m-³. What is the drag coefficient between the leaf and the air? (numerical value only) Number (Hint: For an object to fall with constant speed, it must be at 'terminal velocity'.)arrow_forwardA 40kg box is initially sitting at rest on a horizontal floor with a coefficient of static friction μs=0.4. A horizontal pushing force is applied to the box. What is the maximum pushing force that can be applied without moving the box?arrow_forwardA small child is trying to push a 100 kg box across a rough surface He is applying a force of 100 N parallel to the ground. The box, however, does not budge. The coefficient of static friction between the box and the ground is 0.8. What is the magnitude of the static friction force?arrow_forward
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