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To maintain a constant speed, the force provided by a car's engine must equal the drag force plus the
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- By what factor does the drag force on a car increase as it goes from 65 to 110 km/h?arrow_forwardA black widow spider hangs motionless from a web that extends vertically from the ceiling above. If the spider has a mass of 1.5 g, what is the tension in the web?arrow_forwardAn 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_forward
- At Ted's request, Bill pushes the pizza box across the granite countertop towards Ted. When the box leaves Bill's hand it is sliding at 2.60 m/s. The box comes to rest over a distance of 110 cm. What is the coefficient of kinetic friction, uk, between the pizza box and the countertop? (Ignore air drag.)arrow_forwardKarev is lowering two boxes, one on top of the other, down the ramp, as shown in the figure, by pulling on a rope parallel to the surface of the ramp. Both boxes move together at a constant speed of 15 cm/s. The coefficient of kinetic friction between the ramp and the lower box is 0.444, and the coefficient of static friction between the two boxes is 0.800. (b) What are the magnitude of the friction force on the upper box?arrow_forwardMany birds can attain very high speeds when diving. Using radar, scientists measured the altitude of a barn swallow in a vertical dive; it dropped 208 m in 3.0 s. The mass of the swallow was estimated to be 0.018 kg, and its cross-section area as 5.6 x 10-4 m2. What was the drag coefficient for this swallow as it dove?arrow_forward
- When a hockey player takes a shot from deep in his own zone toward the other end of the rink 400 ft away, one hardly notices the puck slowing down at all. The coefficient of kinetic friction between a puck and the ice is about 0.03. If a player shoots at 100 mph, how fast is the puck moving 400 ft later? Express the answer in miles per hour with four significant digits. If the player shoots at 100 mph, how far would the puck go before it comes to rest? Assume that there is a large lake of ice and no rink. Round the final answer to two decimal placesarrow_forwardA person pushes on a stationary 125-N box with a force of 77 N at 30∘ below the horizontal. The coefficient of static friction between the box and the horizontal floor is 1.18. What is the largest the friction force could be? The person now replaces his push with a 77 N pull at 30∘ above the horizontal. Find the normal force on the box in this case.arrow_forwardThis problem has been removed by your teacher and will not affect your score. A 75kg bicyclist (including the bicycle) is pedaling uphill with a speed increasing at a rate of 1.7m/s?. The bicyclist is also experiencing a 20N drag. Neglect any friction impeding her motion. How many forces are acting on the bicyclist? Are all forces on the bicyclist balanced? What is the magnitude of the net force on the bicyclist? unit 13° What is the magnitude of the normal force on the biyclist? unit How much force is she generating by pedaling? unit cam be d check answersarrow_forward
- A spherical raindrop 2.9 mm in diameter falls through a vertical distance of 3800 m. Take the cross-sectional area of a raindrop = r², drag coefficient = 0.45, density of water to be 1000 kg/m³, and density of air to be 1.2 kg/m³. (a) Calculate the speed a spherical raindrop would achieve falling from 3800 m in the absence of air drag. m/s (b) What would its speed be at the end of 3800 m when there is air drag? (Note that the raindrop will reach terminal velocity after falling about 30 m. m/s 129 Tutorial TV +arrow_forwardA block of mass 0.500 kg slides on a flat smooth surface with a speed of 2.80 m/s . It then slides over a rough surface with uk and slows to a halt. While the block is slowing, (a) what is the frictional force on the block? (b) What is the magnitude of the block's acceleration? (c) How far does the block slide on the rough part before it comes to a halt?arrow_forwardA box rests on top of a flat bed truck. The box has a mass of m = 20 kg. The coefficient of static friction between the box and truck is u, = 0.81 and the coefficient of kinetic friction between the box and truck is Hk = 0.62. 1) The truck accelerates from rest to v; = 16 m/s in t = 12 s (which is slow enough that the box will not slide). What is the acceleration of the box? m/s Submit You currently have O submissions for this question. Only 5 submission are allowed. You can make 5 more submissions for this question. 2) In the previous situation, what is the frictional force the truck exerts on the box? N Submit You currently have 0 submissions for this question. Only 5 submission are allowed. You can make 5 more submissions for this question. 3) What is the maximum acceleration the truck can have before the box begins to slide? m/s Submit You currently have O submissions for this question. Only 5 submission are allowed. You can make 5 more submissions for this question. 4) Now the…arrow_forward
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