from newons law
mgsinθ = μmgcos θ
μ = tanθ
tanθ =0.4
θ = 21.8 degrees
need help with number 40
wuatis thco eent OI Knetic inctOn 38. (I) Suppose you are standing on a train accelerating at 0.20 g. What minimum coefficient of static friction must exist between your feet and the floor if you are not to slide? 39. (II) The c0efficient of static friction between hard rubber and normal street pavement is about 0.90. On how steep a hill (maximum angle) can you leave a car parked? 40. (II) A flatbed truck is...
General Physics with Calc 1 8. A package of dishes (mass 50.0 kg) sits on the flatbed of a pickup truck with an open tailgate. The coefficient of static friction between the package and the truck's flatbed is 0.310, and the coefficient of kinetic friction is 0.240. (a) The truck accelerates forward on level ground. What is the maximum acceleration the truck can have so that the package does not slide relative to the truck bed? (b) The truck barely...
12. As a car goes up a hill, there is a force of friction between the road and the tires rollingon the road. The maximum force of friction is equal to: A) the normal force of the road times the coefficient of kinetic friction. B) the normal force of the road times the coefficient of static friction. C) zero. D) the weight of the car. E) the weight of the car times the coefficient of kinetic friction. 13. If a...
A concrete highway curve of radius 70.0 m is banked at a 19.0° angle. What is the maximum speed with which a 1900 kg rubber-tired car can take this curve without sliding? (Take the static coefficient of friction of rubber on concrete to be 1.0.)
A concrete highway curve of radius 80.0 m is banked at a 19.0 ∘ angle. Part A What is the maximum speed with which a 1400 kg rubber-tired car can take this curve without sliding? (Take the static coefficient of friction of rubber on concrete to be 1.0.)
A concrete highway curve of radius 70.0 m is banked at an 11 degree angle. What is the maximum speed with which a 1200 kg rubber-tired car can take this curve without sliding? (Take the static coefficient of friction of rubber on concrete to be 1.0.)
You are driving your car along a flat, curved road; the curve in the road is a segment of a circle with radius 50 meters. (We call this a "radius of curvature"). How fast can the car drive around the curve if the coefficient of static friction between the tires and the road is 1.0 (tires on dry pavement)? What if the coefficient of friction is 0.2 (tires on ice)?
A concrete highway curve of radius 80.0 m is banked at a 13.0 ∘ angle. Part A What is the maximum speed with which a 1200 kg rubber-tired car can take this curve without sliding? (Take the static coefficient of friction of rubber on concrete to be 1.0.) Express your answer with the appropriate units.
Physics help
1) A worker stands still on a roof sloped at an
angle of 25° above the horizontal. He is prevented from slipping by
a static frictional force of 450 N. Find the mass of the
worker.
2) A stuntman is being pulled along a rough
road at a constant velocity by a cable attached to a moving truck.
The cable is parallel to the ground. The mass of the stuntman is
105 kg, and the coefficient of kinetic...
You are racing in a rally on a snowy day when the temperature is near the freezing point. The coefficient of static friction between a car's tires and an icy road is 0.104. Your crew boss is concerned about some of the hills on the course and wants you to think about switching to studded tires. To address the issue, he wants to compare the actual hill angles on the course to see which of them your car can negotiate....