In the early afternoon, a car is parked on a street that runs down a steep hill, at an angle of 35.0 relative to the horizontal. Just then the coefficient of static friction between the tires and the street surface is 0.725. Later, after nightfall, a sleet storm hits the area, and the coefficient decreases due to both the ice and a chemi- cal change in the road surface because of the temperature decrease. By what percentage must the coefficient decrease if the car is to be in danger of sliding down the street?

Q: A car drives onto a section of the road which is covered in ice. The driver attempts to stop by…

A: stopping distance(s)=60m initial speed(u)=40 km/h=40×1000 m3600 sec=11.1111 m/sec final speed(v)=0…

Q: A box with a mass of 0.5 slugs lies on an inclined plane making an angle of 30o with the horizontal.…

A: We know that  1 slug =14.59 kg  0.5 slug= 7.29 kg

Q: The drag on a pitched baseball can be surprisingly large. Suppose a 145 gram baseball with a…

A: Given; Mass of ball, m = 0.145 kg Diameter of ball, d = 0.074 m therefore , r= 0.037 Drag…

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Q: In figure (a) below, a sled is held on an inclined plane by a cord pulling directly up the plane.…

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Q: A truck is travelling at 97 km/h on a slippery road. The driver has to slam on the brakes and the…

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Q: It is autumn. You look outside a window and see a maple leaf falling face down, in a straight…

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Q: A car (m= 1540 kg) is parked on a road that rises 18° above the horizontal. What are the magnitudes…

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Q: A cart coasts at a constant speed of 18.0m/s down a flat inclined road that makes an angle of 3.1°…

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Q: I am travelling along a flat highway at 60mi/hr (26.8 m/s). (a) If the coefficient of friction…

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Q: The coefficient of friction between the tires of Shirley's 1985 Ford Coupe and the dry pavement is…

A:

Q: A child wants to pull a wagon with a mass of 5.0 kg up a hill, the slope of which forms an angle of…

A: Given:- θ= 8°

Q: A book is caused to slide with initial velocity 4.59 m/s on a rough floor. If the coefficient of…

A:

Q: A 70 kg bicyclist is coasting down a long hill with a 3.5° slope. He’s moving quite rapidly, so air…

A: Given quantities: mass of the bicyclist(m) = 70 kg cross-section area(A) = 0.32 m2 drag…

Q: A car traveling at 60 mph (97,000 m/hr) can stop in 48 m on a level road. Determine the coefficient…

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Q: Consider your package again: at what angle (or greater) would the driveway need to be for the…

A:

Q: A 30 kg sled slides down a 30 degree hill. If the coefficient of friction between the sled and the…

A: The free-body diagram of the sled on the inclined hill is shown below. Here, a is the acceleration,…

Q: A M1 =1000-kg car is on a rough ramp that is inclined at θ = 20° above the horizontal. It is…

A:

Q: A box with a mass of 0.5 slugs lies on an inclined plane making an angle of 30o with the horizontal.…

A: Force = 10.985 N

Q: 45kg gymnast wedges himself between two closely spaced vertical walls by pressing his hands and feet…

A: Given,  Mass = 45 kg   We need to calculate,  Friction force with given condition =?

Q: Bill gets a job delivering pizzas. The pizza companymakes him mount a sign on the roof of his car.…

A: The additional drag force is,

Q: A heavy box of mass M is found at rest on an inclined loading ramp as indicated in the figure. The…

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Q: The driver of a car applies the brakes, and the car starts to skid. If the coefficient of friction…

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Q: An 8 kg block rests on a horizontal surface whose coefficients of friction are: s = 0.4 and k =…

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Q: A 1480 kg pile driver is used to drive a steel I-beam into the ground. The pile driver falls 6.43 m…

A:

Q: While coasting a level section of the track, the speed of a 750kg bobsled decreases from 35m/s to…

A: Given Data :mass of bobsled m = 750 kginitial speed u = 35 m/sfinal speed v = 30 m/sdistance…

Q: You are trying to walk up a steep hill. The coefficient of static friction is 0.62. What is the…

A: Given data: -  The coefficient of static friction is μ = 0.62.

Q: A flatbed truck has a 2000.0 kg component of a pre-fab house placed on its flatbed. If the…

A: Given: Initial velocity,u=0 kmhr Final velocity, v=65.0 kmhr Distance, s=50.0 m Mass, m=2000 kg…

Q: m F 0 You are pressing a box against a sloped ceiling, perpendicular to the ceiling itself, as shown…

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Q: Problem 12: A box slides down a plank of length d that makes an angle of 0 with the horizontal, as…

A: Expression for the non conservative work done is a)From the free body diagram   ----(1)since the…

Q: A 2000 kg trailer truck travels down a road with slope 0.2 with a speed of 20 kph. If the truck…

A: Solution:-Given thatmass of truck (m)=2000 kgSlope (tanθ)=0.2Initial speed (u)=20…

Q: At an accident scene on a level road, investigators measure a car's skid mark to be 93 m m long. It…

A:

Newton's Second Law

Newton’s laws of motion describe the relationship between the motion of an object and forces acting on it. Newton’s law of motion has two types as follows: