The speed of a 200-g toy car at the bottom of a vertical circular portion of track is 7.25 m/s. If the radius of curvature of this portion of the track is 52.5 cm, what are the magnitude and direction of the force the track exerts on the car? (Assume the car's path is in the clockwise direction.)

A person stands on a scale in an elevator. As the elevator starts, the scale has a constant reading of 592 N. As the elevator later stops, the scale reading is 400 N. Assume the magnitude of the acceleration is the same during starting and stopping.

You are driving your car through a roundabout that has a radius of 10 mm. Your physics textbook is lying on the seat next to you. whats the ax speed you can drive before the text book starts sliding

In 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?

A car is driving along a circular track with diameter d = 0.59km at a constant speed of v = 21.2 m/s.  Write an expression and find the value for the minimum coefficient of friction between the cars tires and road required in order to keep the car going in a circle in terms of the given parameters.

Your Physics 4A physics textbook is pressed against the wall by a mysterious floating hand as shown in the figure below. The textbook slides down the wall at a constant acceleration such that its speed decreases by 1.25 m/s every second. The coefficient of kinetic friction between the book and the wall is uk= 0.35. Calculate the force that the hand exerts on the book.

Problem 2: Princess Peach is competing in a Mario Kart race on Rainbow Road. Rainbow Road has no rails, so Peach has to be careful taking turns to make sure she doesn't fall off. There is a notoriously difficult turn on the track made up of a portion of a circle 120m in diameter. The road is angled at 30°. The track has a friction coefficient of μ = .40. Given that Peach and the car weigh 800 kg. a) Draw a free-body diagram for the car on the road. b) What is the magnitude of the normal force, and what angle does it make with the horizontal? c) Repeat part b for the the friction force d) How fast can Peach take the turn without flying or falling off the track?

2. (a) A distant planet has radius 3.6 x 106 m. A 6 kg cat weighs 22 N on the surface of this planet. Calculate the mass of the planet. (b) You push a 65 kg desk horizontally and it accelerates at 1.2 m/s2. If the coefficient of kinetic friction between the desk and floor is 0.38, calculate the magnitude of the force you apply to the desk.

An object weights 5000 N on planet Alpha and 800 N on planet Beta. Planet Alpha has 4 times the mass of planet Beta. What is the ratio of Alpha's radius to Beta's radius? A 50 kg object is moving in uniform circular motion with a radius of 25 m. It takes the object 6 s to make one complete revolution. Find the net force acting on the object.

You and some friends are trying to help another friend pull his car out some mud by attaching three ropes tohis car. One friend insists that the three ropes should be attached in the fashion shown in the figure. Theforce applied by each rope is also shown in the figure. If the car has a mass of 1500 kg, what is the magnitudeand direction of the acceleration of the car?