A 5 kg block is placed on an inclined plane of angle 30 degrees and pushed up the plane with a horizontal force of magnitude 30 N. In the above problem what is the magnitude of the force exerted by the block on the plane?
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- Physics students do an expriment to determine the coefficient of kinetic friction between a wooden object and the horizontal table it is on. This object has a mass of 1.6 kg. The students push it against a spring, which compresses the spring by 18cm. When released, the spring sends the object moving across the table and it stops 82 cm from where it was released. The spring constant is 200 N/m. Find the obeject-table coefficient of kinetic friction.A person is pushing a wheelbarrow along a ramp that makes an angle ?=43.0∘ with the horizontal. The wheelbarrow and load have a combined mass of ?=24.05 kg with the center of mass at the midpoint of the length ?. What is the magnitude of the net force ?net that the person must apply in order to push the wheelbarrow up the ramp at a constant velocity, while keeping the wheelbarrow in a level, horizontal orientation? Assume that the radius of the wheel is small enough to ignore. Use ?=9.81 m/s2.Find the magnitude and direction of the unknown force?
- Problem 10: Show how to resolve each force into its x, y, z components. Set up the calculation used to find the magnitude of each component. (a) F-600 N (b F = 500 NA block with a mass of 0.350kg is placed on a rough planar surface that is inclined 30° above the horizontal. The maximal coefficient of static friction 0.25 and the coefficient of kinetic friction is 0.12. If the block is released from rest, what acceleration does it experience?A fish of mass 1kg is lying still on an inclined plane at 3o degrees above the horizontal. the magnitude of the normal force exerted by the plane on the fish is. 0N 9.8N 8.5 N 4.9N
- Bob borrows a lunch tray of negligible mass to push Will on the tray across a level portion of the field. The coefficient of kinetic friction between the tray and the grass is 0.25 and the coefficient of static friction is 0.30. Will is pushed 40m across the field by Bob at a constant speed, but Bob is so tall that he pushes with a force of 40 degrees below the horizontal. Will gained some weight during quarantine, so he now weighs 120kg. a) What power does Bob need to move Will across the field in 20sec? b) What could Bob do to decrease the work he needs to push Will across the field without decreasing his force?A man pushing a crate of mass m = 92.0 kg at a speed of v = 0.875 m/s encounters a rough horizontal surface of length ℓ = 0.65 m as in the figure below. If the coefficient of kinetic friction between the crate and rough surface is 0.350 and he exerts a constant horizontal force of 297 N on the crate. A man pushes a crate labeled m, which moves with a velocity vector v to the right, on a horizontal surface. The horizontal surface is textured from the right edge of the crate to a horizontal distance ℓ from the right edge of the crate. (a) Find the magnitude and direction of the net force on the crate while it is on the rough surface. magnitude ______N direction ---Select--- (b) Find the net work done on the crate while it is on the rough surface._____ J(c) Find the speed of the crate when it reaches the end of the rough surface._____m/sa) Cables AC and BC are connected to lifting points A & B, and joined together at C as shown in Figure Q1a. The angle = 200 and angle B = 50°. If the tension in each cable is 3.75 KN, calculate the force (F) and the angle a required to maintain point C in static equilibrium. Give your answers for F in kilonewtons (kN) and the angle a in degrees to two decimal places. A 3 F α B O
- You are working in an ice skating rink and have been asked to hang a new banner on the wall. Your friend is helping you so that the ladder does not collapse by exerting a force F_AL at an angle ϕ relative to the horizontal. The ladder has a length L and makes an angle of θ with respect to the vertical wall. You have a mass, m_Y, and are a horizontal distance x from the wall. The ladder has a mass of m_L. Because the wall is slick, and the ice on the floor is slick, the frictional forces acting on the ladder are negligible. Find a formula for the magnitude of the force that your friend must exert to keep the ladder from falling, in terms of the following variables: x,L,m_Y,m_L,θ,ϕ. Then use the following values to get a number for the magnitude of F_AL. θ = 30.3 degrees ϕ = 23.028 degrees x = 1.491 meters L = 7.1 meters m_Y = 86.0 kg m_L = 42.14 kg Find the magnitudes of: F_AL, normal force of the wall on the ladder (N_WL), and normal force of the floor on the ladder (N_FL).The upper leg muscle (quadriceps) exerts a force of FQ = 1080 N, which is carried by a tendon over the kneecap (the patella) at the angles shown in the figure. Find the magnitude of the force, in newtons, exerted by the kneecap on the upper leg bone (the femur) at the point P. What angle does the force from the kneecap act at, in degrees measured counterclockwise from the positive x-direction shown in the figure?10:56 MENU A. 130N ● Two crewmen pull a raft through a lock, as shown in Figure below. One crewman pulls with a force of 130 N at an angle of 34° relative to the forward direction of the raft. The second crewman, on the opposite side or the lock, pulls at an angle of 45°. With what force should the second crewman pull so that the net force of the two crewmen is in the forward direction? B. 130N C. D. 130N 130N E. 130N III 45° 34% 130 N cos34⁰ sin45⁰ sin 34⁰ cos450 sin 34⁰ sin45⁰ sin45⁰ sin34⁰ cos34⁰ cos45⁰ VO) 4G | 46 | 71% O myExams <