The 81-kg crate is subjected to the forces shown. If it is originally at rest, determine the distance it slides in order to attain a speed of v = 8 m/s. The coefficient of kinetic friction between the crate and the surface is uk = 0.27. Forces with respect to 45° and 30° are 611 N and 398 N, respectively

Mary and her sister are playing with a cardboard box on the neighborhood hill. Mary climbs into the box, the total mass of the box with Mary in it is 115 kg. The box starts at rest at the beginning of the incline. The hill is at an incline of 28 degrees with respect to the horizontal.The static and kinectic friction between the box and hill is 0.4 and 0.2 respectively. Assume that Mary is now in the box, but has not started to move. a. What is the gravitational force acting on the box and child system?b. What is the magnitude of the normal force acting on the box?c. What is the reaction force associated with the normal force found in the previous step.

The 18-kg block A slides on the surface for which μk = 0.3. The block has a velocity v = 10 m/s when it is s = 4 m from the 11-kg block B. The unstretched spring has a stiffness k = 1200 N/m . Take e = 0.6. The coefficient of friction is the same for both blocks.

Q20. The 74-kg man pushes on the 134-kg crate with a horizontal force F. If the coefficient of kinetic friction between the crate and the surface is k = 0.12, and the coefficient of static friction between the man's shoes and the surface is με = 0.85, what is the greatest acceleration (in m/s²) the man can give the crate? Hint, this is when the man himself is on the verge of slipping. Please pay attention: the numbers may change since they are randomized. Your answer must include 2 places after the decimal point. Take g = 9.81 m/s². Answer: ▬▬▬▬▬▬▬▬▬▬

Assume that a driver (car modeled as a point mass) is negotiating a circular turn with a radius of 160 ft. The car and driver have a mass of 3800 lb and the coefficient of friction between the car and road is µ1 = 0.85. What is the maximum constant speed for which the car can travel at the given radius? r= 160 ft

The crate, which has a mass of 245 kg is subjected to the action of the two forces. If it is originally at rest determine the distance it slides in order to attain a speed of 12 m/s. The coefficient of kinetic friction between the crate and the surface is 0.18 800 N 30° 4 1000 N

The 925-kg motorized unit A is designed to raise and lower the 615-kg bucket B of concrete. Determine the average force R which supports unit A during the 5.9 seconds required to slow the descent of the bucket from 4.6 m/s to 0.9 m/s. Analyze the entire system as a unit without finding the tension in the cable. Answer: R = i kN

The force P is applied to the 50-kg block when it is at rest. Determine the magnitude and direction of the friction force exerted by the surface on the block if (a) P = 0, (b) P = 226 N, and (c) P = 353 N. (d) What value of P is required to initiate motion up the incline? The static and kinetic coefficients of friction between the block and the incline are μs = 0.30 and μk = 0.27, respectively. The friction force is positive if up the incline, negative if down the incline.

Block A has a mass of 10 kg and bloc B has a mass of 2 Kg and are kept at rest. The 2 blocs are comected by a cord passing by a wheel at the top of the incline. The surface of the incline has a friction coefficient -0.12. The angle of the incline is 0= 30°. A is at 6 meters above the incline floor. After being released from rest, the bloc A will move down. Determine the total energy of the bloc A after it has moved down the incline by 4 meters.. Calculate its velocity. 6 m B

The 10-lb block has a speed of 4 ft/s when the force of F = (8t²) lb is applied. The coefficient of kinetic friction at the surface is μ = 0.2. (Figure 1) Figure F = (81²) lb v = 4 ft/s 1 of 1 > Part A Determine the speed of the block when it moves s = 30 ft. Express your answer to three significant figures and include the appropriate units. V = Submit 0 O μA Value Provide Feedback Request Answer Units ? Next >