To transport a series of bundles of shingles A to a roof, acontractor uses a motor-driven lift consisting of a horizontalplatform BC which rides on rails attached to the sides of aladder. The lift starts from rest and initially moves with aconstant acceleration a1 as shown. The lift then deceleratesDat a constant rate a2 and comes to rest at D, near the top ofthe ladder. Knowing that the coefficient of static friction4.4 mbetween a bundle of shingles and the horizontal platform is0.30, determine the largest allowable acceleration a1 and thelargest allowable deceleration az if the bundle is not to slideon the platform.aj65°AВ0.8 m

Answered: Image /qna-images/answer/a93b1484-4a9e-45f4-a920-ba4f339f6e87.jpg

Answered: To transport a series of bundles of…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Required information A uniform thin bar AB of length L = 5.5 ft is released from rest at an angle 0 = 0₁. As the bar slides, the ends A and B maintain contact with the surfaces on which they slide. A L B Neglecting friction and knowing that the end A has a speed of 18 ft/s right before hitting the floor, determine 0₁. The value of 0₁ is
Two steel balls, each of mass m = 1.84 kg, are welded to a light rod of length L = 545 mm and negligible mass and are initially at rest on a smooth horizontal surface. The distance b= 111 mm. A horizontal force of magnitude F= 27 N is suddenly applied to the rod as shown. Determine (a) the magnitude of the instantaneous acceleration a of the mass center G and (b) the magnitude of the corresponding rate 0 at which the angular velocity of the assembly about G is changing with time. m Answers: a = O = IN 7. 77 M m/s² rad/s²
Q5) The 50-kg crate shown rests on a rough horizontal surface for which the coefficient of kinetic friction is #x=0.3. An electrically powered winch is utilized to accelerate the crate at a constant rate until it attains a speed of v-Sm's within a distance of s=20m. If the motor and the winch have an efficiency of n-0.70, determine the power that must be supplied to the motor when s= 20 m. 20 m 50 kg D
A package is projected up a 15° incline at A with an initial velocity of 8 m/s. Knowing that the coefficient of kinetic friction between the package and the incline is 0.12, determine (a) the maximum distance d that the package will move up the incline, (b) the velocity of the package as it returns to its original position.
2. (25) The small 2-kg block A slides down the curved path and passes the lowest point B with a speed of 4 m/s. If the radius of curvature of the path at B is 1.5 m, and the coefficient of friction between the block and path is 0.3, determine (a) the normal force exerted on the block by the path at B, and (b) the rate of change of speed at this point. B
2. A uniform rod BC of mass 5 kg is connected to a collar A by a 250-mm cord AB. Neglecting the mass of the collar and cord, determine (a) the smallest constant acceleration a for which the cord and the rod will lie in a straight line, (b) the corresponding tension in the cord. ад A B 400 mm 250 mm 350 mm
(a) the relative acceleration of the collar with respect to the rod, . (b) the magnitude of the horizontal force exerted on the collar by the rod.
Problem #2 A collar of mass m is attached to a spring and slides without friction along a circular rod in a vertical plane. The spring has an undeformed length of 5 in. and a constant k. Knowing that the collar has a speed v at Point C, draw the FBD and KD of the collar at this point. 5 in. 7 in. |B
A small, 300-g collar D can slide on portion AB of a rod which is bent as shown. Knowing that a = 40° and that the rod rotates about the vertical AC at a constant rate of 5 rad/s, determine the value of r for which the collar will not slide on the rod if the effect of friction between the rod and the collar is neglected. B D a
4. A train of mass 500 t is drawn by a locomotive of mass 50 t, which exerts a tractive effort of 75 kN, while tractive resistance is 60 N/t. Determine the time and distance required to reach a velocity of 80 km/h from rest, on level track.
A uniform rod BC of mass 10 kg is connected to a collar A by a 350-mm cord AB. Neglecting the mass of the collar and cord, determine (a) the smallest constant acceleration a for which the cord and the rod will lie in a straight line, (b) the corresponding tension in the cord. Hint: The smallest constant acceleration is attained when point C of the rod is about to leave the floor. ад A 350 mm 650 mm C B 450 mm
(2) A 5 lb ball is attached to a 3 ft long rope and it rotates in a vertical circular path at a constant tangent velocity of 30 ft/s. (a) Determine the tension in the rope when the ball is at point A. (b) Determine the tension in the rope when the ball is at point B. B 3 ft A

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