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Transcribed Image Text:9. A student is skateboarding down a ramp that is 6.0 m long and inclined at 18° with respect to the horizontal.
The initial speed of the skateboarder at the top of the ramp is 2.6 m/s. Neglect friction and find the speed at the
bottom of the ramp.
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- a girl and her bicycle have a total mass of 60kg. at the top of the hill her speed is 5.0m/s. The hill is 5.0 m high and 100 m long. If the force of friction as she rides down the hill is 20N, what is her speed at the bottom?arrow_forwardA 1400 kg car delivers a constant 42 hp to the drive wheels. We assume the car is traveling on a level road and that all frictional forces may be ignored.A) What is the acceleration of this car when its speed is 10 m/s?B) If the speed of the car is doubled, does its acceleration increase, decrease, or stay the same? Explainarrow_forward2. In the accompanying figure, a tiny cube is pushed and released at point A. It has an initial velocity of 7.23 m/s. The whole course is frictionless except that marked L which is 16.2 m and has a coefficient of kinetic friction of µk = 0.78. Heights hi = 6.00 m and h2 = 2.00 m. (a) What is the speed of the cube at point B? (Hint: you do NOT need its mass) (b) What is the speed of the cube at point C? (c) Does the cube make it to point D? If so, how fast is it going there? If not, what is its distance traveled through region L?arrow_forward
- A child and sled with a combined mass of 58.0 kg slide down a frictionless slope. If the sled starts from rest and has a speed of 2.00 m/s at the bottom, what is the height of the hill?arrow_forward14. In the figure, a 4.0 kg block slides along a track from one level to a higher level after passing through an intermediate valley. The track is frictionless until the block reaches the higher level. There a frictional force stops the block in a distance d. The block's initial speed is vo = 6.0 m/s, the height difference is h = 1.2 m, and uk = 0.40. (1) Find the speed of the block when it just reaches the higher level (2) Find the distance d. μ = 0 -μ*arrow_forwardAn elevator has mass 600 kg, not including passengers. The elevator is designed to ascend, at constant speed, a vertical distance of 20.0 m (five floors) in 16.0 s, and it is driven by a motor that can provide up to 40 hp to the elevator. What is the maximum number of passengers that can ride in the elevator? Assume that an average passenger has mass 65.0 kg. Please note that 11, 17, and 27 are not correct according to my teacher.arrow_forward
- 1. A 5.00-kg block is set into motion up an inclined plane with an initial speed of v; = 8.00 m/s. The block comes to rest after traveling 3.00 m along the plane, which is inclined at an angle of 30.0° to the horizontal. For this motion determine (a) the change in the block's kinetic energy, (b) the change in the potential energy of the block- Earth system, and (c) the friction force exerted on the block (assumed to be constant). (d) What is the coefficient of kinetic friction?arrow_forwardA 4.00kg block moves with an initial speed of3.50 km/h downhillover an inclined plane as shown in the figure. The height of the inclined plane is 51.3cm and the friction coefficient between the block and the incline is 0.120. a.How much is the speed of the block at the midpoint of the inclined side. b.How much is the speed of the block at the bottom of the inclined side.arrow_forward13. A 70-kg base runner begins his slide into second base when he is moving at a speed of 4.0 m/s. The coeffi- cient of friction between his clothes and Earth is 0.70. He slides so that his speed is zero just as he reaches the base. (a) How much mechanical energy is lost due to friction acting on the runner? (b) How far does he slide?arrow_forward
- A 2.46 kg block moves along a frictionless surface with a speed of 7.83 m/s when it encounters a rough shallow hill, whose sides have a length of l=5.21 m. The hill is low enough so that the block can make it over the hill. Because the surface of the hill is rough (shown in orange in the figure), the block experiences a frictional force of 2.23 N while on the hill. a) What is the speed of the block after it traverses the hill?arrow_forwardI am unsure where to start on this problem how do I do it?arrow_forward9. A 35.0-kg block slides down a surface with a coefficient of friction of 0.250. It is released from rest at the top of an incline (38.0° to the horizontal) at a height 10.0 meters. What is its speed at the bottom of the incline? 10=arrow_forward
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