In the figure, a crate of mass m = 100 kg is pushed at constant speed up a frictionless ramp (0 = 30.0°) by a horizontal force X The three forces acting on the crate must be identified. Which forces act on the crate? 'O Gravitational force Frictional force Horizontal force Tension Normal force
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- A skateboarder with mass m, = 44 kg is standing at the top of a ramp which is h, = 3.9 m above the ground. The skateboarder then jumps on his skateboard and descends down the ramp. His speed at the bottom of the ramp is v= 6.7 m/s. Part (b) The ramp makes an angle e with the ground, where 0 = 30°. Write an expression for the magnitude of the friction force, f, between the ramp and the skateboarder. cos(e) sin(e) 8 HOME a 5 6 1 2 3 h, P . END m, + Vf vol BACKSPACE CLEAR Part (c) When the skateboarder reaches the bottom of the ramp, he continues moving with the speed vfonto a flat surface covered with grass. The friction between the grass and the skateboarder brings him to a complete stop after 5.00 m. Calculate the magnitude of the friction force, Fgras; in newtons, between the skateboarder and the grass. Fgrazs =A skateboarder with mass m, = 44 kg is standing at the top of a ramp which is h, = 3.9 m above the ground. The skateboarder then jumps on his skateboard and descends down the ramp. His speed at the bottom of the ramp is v= 6.7 m/s. Part (b) The ramp makes an angle e with the ground, where 0= 30°. Write an expression for the magnitude of the friction force, fr. between the ramp and the skateboarder. F;= cos(e) sin(0) 8 9 HOME d 1 2 3 hy m. + END Vf vol BACKSPACE CLEAR Part (c) When the skateboarder reaches the bottom of the ramp, he continues moving with the speed vonto a flat surface covered with grass. The friction between the grass and the skateboarder brings him to a complete stop after 5.00 m. Calculate the magnitude of the friction force, Fgras: in newtons, between the skateboarder and the grass. Fgras:=A parachutist’s fall to Earth is determined by two opposing forces. A gravitational force of 539 N acts on the parachutist. After 2 s, she opens her parachute and experiences an air resistance of 615 N. At what speed is the parachutist falling after 10 s?
- A cart with mass 15.0 kg moves in a straight line on a frictionless horizontal surface. Take this surface to be along the x-axis. The cart has an initial speed of 8.00 m/s and it was pushed 5.00 m in the same direction as the initial velocity by an external force with a magnitude of 20.0 N. What is the cart's final speed?Please answer fast- Physics A crate of milk chocolate is being moved up a 63° ramp as shown. The crate has a mass of 10 kg. The crate is being pushed by an applied force F=1320 N which is directed perfectly horizontally. The normal force on the crate is FN=1136 N. The crate is subject to kinetic friction as it moves characterized by coefficient of kinetic friction equal to 0.180. The crate moves a distance 1.9 m along the ramp. For each force listed below determine the work done on the crate during this motion. Be sure to include the appropriate + or -. Part A) applied force Part B) force of gravity Part C) normal force Part D) kinetic friction force Part E)T he net work done on the cratepage 28: You push a file cabinet up a frictionless ramp tilted at 10°with horizontal. The file cabinet has a mass of 100 kg and you are pushing with a 700 N force in the direction up along the ramp. The file cabinet has initial speed of 2.0 m/s. It’s moved 8.0 m up along the ramp. page 29: You push a file cabinet up a frictionless ramp tilted at 10°with horizontal. The file cabinet has a mass of 100 kg and you are pushing with a 700 N force in the direction up along the ramp. The file cabinet has initial speed of 2.0 m/s. It’s moved 8.0 m up along the ramp.
- The 2-kg block is subjected to a force F having a constant direction and a magnitude 100 N When s=4 m, the block is moving to the left with a speed of 8 m/sec. Determine its speed when s= 12 m. The coefficient of kinetic friction between the block and the ground is 0.25 F 30° O 64 m/sec 86 60 m/sec O 24 85 m/sec 15.40 m/secThe only force acting on an object of mass 2.00 kg moving along the x-axis is shown in the figure. If the speed vx is +2.0 m / s at t = 0, what is the speed at t = 4.0 s?After collecting so much Halloween candy, you want to find a secret place to eat it all without being bothered. You see a small hiding place on top of a neighbors shed. Luckily, the neighbor has a ramp that leads up to the roof of the shed. You pull your bag of candy with a mass of 6.2 kg up the frictionless ramp which is at an angle of 29 degrees above the horizontal. The bag has an acceleration of 1.81 m/s2 parallel to, and UP the ramp while you are pulling -What is the Normal Force exerted on bag of candy by the ramp? - What force do you need to pull with in order to give the bag an acceleration of 1.81 m/s2?
- A parachutist whose mass is 85 kg drops from a helicopter hovering 2000 m above the ground and falls toward the ground under the influence of gravity. Assume that the force due to air resistance is proportional to the velocity of the parachutist, with the proportionality constant b 1 = 20 N - sec/m when the chute is closed and b 2 = 90 N - sec/m when the chute is open. If the chute does not open until the velocity of the parachutist reaches 35 m/sec, after how many seconds will the parachutist reach the ground? Assume that the acceleration due to gravity is 9.81 m/ sec ^2The 2090 kg cable car shown in the figure descends a 200-m-high hill. In addition to its brakes, the cable car controls its speed by pulling an 1860 kgcounterweight up the other side of the hill. The rolling friction of both the cable car and the counterweight are negligible. How much braking force does the cable car need to descend at constant speed? One day the brakes fail just as the cable car leaves the top on its downward journey. What is the runaway car's speed at the bottom of the hill?Two packages slide down a 20 degree ramp from rest a distance of d=6.6 m along the ramp. Package A has a mass of 5.0 kg and a coefficient of kinetic friction 0.20 between it and the ramp. Package B behind package A has a mass of 10 kg and a coefficient of kinetic friction 0.15 between it and the ramp. How long does it take package A to reack the bottom?