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- KE = mv², Ug = mgh, Us=kx², E = KE + Ug + Us, E₁ = Ef, Wfric Ffried, Ffric = HkN, Et-Wfric = Ef Problem 1: In the Figure below a block slides along a path that is without friction until the block reaches the section of length L = 0.75 m, which begins at height h = 2 m on a ramp of angle 0 = 30°. In that section, the coefficient of kinetic friction is 0.40. The block passes through point A with a speed of 8 m/sec. What is the speed of the block at point B (where the friction ends)? Answer: 3.5 m/sec B/ 0In the figure, a 3.6 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 = 6.8 m/s, the height difference is h = 0.99 m, and uk = 0.592. Find d. d H = 0- Number Units the tolerance is +/-5%A piece of ice (m = 1 Kg) slides down the slope of a roof inclined at 50.0°. It starts from rest and slides 8.0 m along the roof, sliding off the edge at a height of 4.0 m above the level ground. The coefficient of kinetic friction is 0.14. V¡ = 0.0 m/s m = 500.0 g 8,0 m Hx = 0.14 30° 4.0 m (a) Draw a free-body diagram of the ice as it is sliding along the roof. (b) Calculate the acceleration of the object. (c)With what speed does it leave the roof?
- 1. A 6.7 kg object initially starts from rest at the top of a ramp. The length of the ramp is 5.5 m and forms an angle of 23° above the horizontal. When the object reaches a height of 1.5 m, it has a speed of 3.0 m/s. Ramp -5.5 m m = 6.7 kg 1.5 m 23° What is the force of friction?1f-5-3 N 18. A block of ice with mass 2.00 kg slides 0.605 m down an inclined plane that slopes downward at an angle of 30.2° below the horizontal. If the block of ice starts from rest, what is its final speed? You can ignore friction. Express your answer in meters per second.
- A0.28-kg rock is thrown vertically upward from the top of a cliff that is 31 m high. When it hits the ground at the base of the cliff, the rock has a speed of 30 m/s . You may want to review (Pages 234 -241) - Part A Assuming that air resistance can be ignored, find the initial speed of the rock. Express your answer using two significant figures. ? m/s Submit Requeet Answer Part B Find the greatest height of the rock as measured from the base of the cliff. Express your answer using two significant figures. Hmar = Submit Requeet AnewerThe power required to drag an object through a viscous fluid (like honey) is P = -bv², where v is the speed of the object. What are the Sl units of b? O kg /s kg /s? O kg / m O kg/m? O kg / m·s none of these71.Block 2 shown below slides along a frictionless table as block 1 falls. Both blocks are attached by a frictionless pulley. Find the speed of the blocks after they have each moved 2.0 m. Assume that they start at rest and that the pulley has negligible mass. Use m, = 2.0 kg and m₂ = 4.0 kg. 20 Solution
- ► cube can slide without friction up and down a 30° slope. The ice cube is pressed against a spring at the bottom of the slope, compressing the spring 10 cm. The spring constant is 28 N/m. When the ice cube is released. what total distance will it travel up the slope before reversing direction? Express your answer with the appropriate units. As- Submit Part 8 Value Units → The ca cuce is replaced by a 44 g plastic cube whose coefficient of kinetic iction is 0.20. How far will the plastic cube travel up the slope? Express your answer with the appropriate units. ? Units ?1A child of mass 30.0 kg begins from rest and slides down a waterslide without friction, then launches into a pool. What is her speed at pt. 2 assuming the height of this point is 0.9 above the ground? pt. 1 2.0 m pt. 2 pt. 5 h pt. 3 0.8 m pt. 4 0.4 m Apt. 6