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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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- A 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_forwardBy what factor does the drag force on a car increase as it goes from 65 to 110 km/h?arrow_forwardIf I pull a 120kg sled with 240N of force and it accelerates with an acceleration a=0.5m/s^2, what is the coefficient of friction between the box and the floor? I now have my 20kg dog in the sled. If I pull with the same force, what is the acceleration of the sled?arrow_forward
- The drag on a pitched baseball can be surprisingly large. Suppose a 145 gram baseball with a diameter of 7.4 cm has an initial speed of 40.2 m/s (90 mph). a) What is the magnitude of the ball’s acceleration due to the drag force? b) If the ball had this same acceleration during its entire 18.4m trajectory, what would its final speed be?arrow_forwardAt 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_forwardThe rock is hanging from the middle of a clothesline. The rope is attached at equal heights 24 units apart and the entre point sags 1 unit below them. What is the tension if he has a mass of 20kg?arrow_forward
- A 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_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_forwardA box of bananas weighing 40.0 N rests on a horizontal surface.The coefficient of static friction between the box and the surfaceis 0.40, and the coefficient of kinetic friction is 0.20. If the monkey applies a horizontal force of 18.0 N, what is the magnitude of the friction force and what is the box’s acceleration?arrow_forward
- To maintain a constant speed, the force provided by a car’s engine must equal the drag force plus the force of friction of the road (the rolling resistance). (a) What are the drag forces at 70 km/h and 100 km/h for a Toyota Camry? (Drag area is 0.70 m2 ) (b) What is the drag force at 70 km/h and 100 km/h for a Hummer H2? (Drag area is 2.44 m2) Assume all values are accurate to three significant digits.arrow_forwardA 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 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?arrow_forward
- Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage LearningUniversity Physics Volume 1PhysicsISBN:9781938168277Author:William Moebs, Samuel J. Ling, Jeff SannyPublisher:OpenStax - Rice University
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