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- In a laboratory model of cars skidding to a stop, data are measured for four trials using two blocks. The blocks have identical masses but different coefficients of kinetic friction with a table: k = 0.2 and 0.8. Each block is launched with speed vi = 1 m/s and slides across the level table as the block comes to rest. This process represents the first two trials. For the next two trials, the procedure is repeated but the blocks are launched with speed vi = 2 m/s. Rank the four trials (a) through (d) according to the stopping distance from largest to smallest. If the stopping distance is the same in two cases, give them equal rank. (a) vi = 1 m/s, k = 0.2 (b) vi = 1 m/s, k = 0.8 (c) vi = 2 m/s, k = 0.2 (d) vi = 2 m/s, k = 0.8Math Review Solve the two equations mi + MVi = mf + MVf and i Vi = (f Vf) for (a) f and (b) Vf if m = 2.00 kg, i = 4.00 m/s, M = 3.00 kg, and Vi = 0. (See Section 6.3.)In a laboratory model of cars skidding to a stop, data are measured for four trials using two blocks. The blocks have identical masses but different coefficients of kinetic friction with a table: k = 0.2 and 0.8. Each block is launched with speed vi = 1 m/s and slides across the level table as the block comes to rest. This process represents the first two trials. For the next two trials, the procedure is repeated but the blocks are launched with speed vi = 2 m/s. Rank the four trials (a) through (d) according to the stopping distance from largest to smallest. If the stopping distance is the same in two cases, give them equal rank. (a) vi = 1 m/s, = 0.2 (b) vi = 1 m/s, k = 0.8 (c) vi = 2 m/s, = 0.2 (d) vi =2 m/s, k = 0.8
- The driver of a speeding empty truck slams on the brakes and skids to a stop through a distance d. On a second trial, the truck carries a load that doubles its mass. What will now be the trucks skidding distance? (a) 4d (b) 2d (c) 2d (d) d (e) d/2Q1. Two blocks A and B are held stationary 10 m apart on a 20° inclined plane as shown in the figure. The coefficient of friction between the plane and block A is 0.3 while it is 0.2 between plane and block B. If the blocks are released simultaneously, calculate the time taken and the distance travelled by each block before they are at the verge of collision. WR = 500 N W = 250 N B A H 0.2 0.3 10 m 200 Q2. Two equal weights "W" are connected by a string passing over a frictionless pulley. A small weight w is attached to one side as shown in the figure, causing the weight to fall. Determine the acceleration of the system assuming that the weight starts from rest. W W/ W/V1 Refer to Figure the brakes are released. The coefficient of kinetic friction between the tires and the road is 0.7. A truck is traveling at 31 m/s when the brakes are fully applied causing the wheels to skid for 3 seconds and then What is the final speed of the truck in units of m/s ? O 10.40 O 7.40 O 13.40 O 4.40
- 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 coefficient of friction between the block (m3D3kg) and the surface in below figure is p=0.4. The system starts from rest. What is the velocity of the m1 (5kg) mass when it has fallen 1.5m? block = 3kg %3D m1 =5kg Ah =1.5m Ah Lütfen birini seçin: a. 5.12 m/s b. 3.75 m/s C. 2.78 m/s d. 4 m/s e. 7 m/s3. A skier of mass m starts from rest at the top of a frictionless, snow covered hill angled at 0 above the horizontal. The ski down the hill a distance du and onto a flat parking lot. The coefficient of friction between the cement in the parking lot and the skis is μk. They move along the parking lot a distance dR before stopping. This is drawn below a. Derive an equation for the skier's speed at the bottom of the hill.. b. Derive an equation for dr, the distance the skier slides into the parking lot before stopping. c. If there was a little friction between the snow and skies, explain how your solution would change. You should not re-solve the problem, just describe how your methods would need to change. dH e dR
- A box is projected upward onto a ramp that has a 15 degree incline. I know knows that it starts with an initial velocity of 8 m / s. The coefficient of kinetic friction between the box and the ramp is 0.12. Determine the following: a. The distance the box will travel on the ramp. b. The speed of the box when it returns to its original position.A0.440 kg shuffleboard disk is initially at rest when a player uses a cue to increase its speed to 4.40 m/s at constant acceleration. The acceleration takes place over a 2.80 m distance, at the end of which the cue loses contact with the disk. Then the disk slides an additional 12.8 m before stopping. Assume that the shuffleboard court is level and that the force of friction on the disk is constant.What is the increase in the thermal energy of the disk-court system (a) for that additional 12.8 m and (b) for the entire 15.6 m distance? (c) How much work is done on the disk by the cue? (a) Number Units (b) Number Units (c) Number i Units77 K/s l A:0. docs.google.com/forms Sove tne peiow question ana then seiect the correct answer Sam pushes toward the right on a box with a force of magnitude 31.0 N. Sarah applies an 11.0 N force on the box in the opposite direction. The magnitude of the kinetic friction force between the box and the very smooth floor is 4.50 N as the box slides toward the right. Also, the magnitude of the normal force is 98 N. Find the box's mass, the box's acceleration in the x-direction, the box's acceleration in the y-direction, and the coefficient of dynamic friction. Choose the correct answers * m = 10 kg, a, = 2.55 m/s?, a, = 0 m/s?,p = 0.5 العربية الإنجليزية