Homework1- A 20-kg package is at rest on an incline when a force P is applied to it. Determine themagnitude of P if 10 s is required for the package to travel 5 m up the incline. The staticand kinetic coefficients of friction between the package and the incline are both equal to0.3.2- The two blocks shown are originally at rest. Neglecting the masses of the pulleys andthe effect of friction in the pulleys and assuming that the coefficients of friction betweenblock A and the horizontal surface are u, = 0.25 and uk = 0.20, determine (a) theacceleration of each block, (b) the tension in the cable.3- To unload a bound stack of plywood from a truck, the driver first tilts the bed of thetruck and then accelerates from rest. Knowing that the coefficients of friction betweenthe bottom sheet of plywood and the bed are u, = 0.40 and uk = 0.30, determine (a)the smallest acceleration of the truck which will cause the stack of plywood to slide, (b)the acceleration of the truck which causes corner A of the stack to reach the end of thebed in 0.9 s.40Asst. Prof. Dr. Waleed Al-AshtariCollege of Engineering / University of BaghdadDynamics2 m1204- Knowing that the system shown starts from rest, find the velocity at t = 1.2 s of (a)collar A, (b) collar B. Neglect the masses of the pulleys and the effect of friction.10 kg15 kg5- A 60-kg wrecking ball B is attached to a 15-m-long steel cable AB and swings in thevertical arc shown. Determine the tension in the cable (a) at the top C of the swing, (b)at the bottom D of the swing, where the speed of B is 4.2 m/s.

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1- A 20-kg package is at rest on an incline when a force P is applied to it. Determine the magnitude of P if 10 s is required for the package to travel 5 m up the incline. The static and kinetic coefficients of friction between the package and the incline are both equal to 0.3.

1- A 20-kg package is at rest on an incline when a force P is applied to it. Determine the magnitude of P if 10 s is required for the package to travel 5 m up the incline. The static and kinetic coefficients of friction between the package and the incline are both equal to 0.3.

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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Concept explainers

Forming and Shaping

Metal forming is a category of metalworking process through which the material can be given the desired shape and size by subjecting it to plastic deformation, where the component undergoes bulk deformation process upon application of loads. Unlike the shearing and machining process, the material does not undergo up to a failure point as indicated in the stress-strain curve. Hence, the stresses induced during the forming process are greater than yield strength but less than the failure strength of the material. The process does not lead to the loss of material, so it can be said to be an economical process. During forming, the material is subjected to tensile forces, compressive forces, bending, and shearing loading conditions. The material should possess the property of ductility to undergo the forming process.

Question

Homework
1- A 20-kg package is at rest on an incline when a force P is applied to it. Determine the
magnitude of P if 10 s is required for the package to travel 5 m up the incline. The static
and kinetic coefficients of friction between the package and the incline are both equal to
0.3.
2- The two blocks shown are originally at rest. Neglecting the masses of the pulleys and
the effect of friction in the pulleys and assuming that the coefficients of friction between
block A and the horizontal surface are u, = 0.25 and uk = 0.20, determine (a) the
acceleration of each block, (b) the tension in the cable.
3- To unload a bound stack of plywood from a truck, the driver first tilts the bed of the
truck and then accelerates from rest. Knowing that the coefficients of friction between
the bottom sheet of plywood and the bed are u, = 0.40 and uk = 0.30, determine (a)
the smallest acceleration of the truck which will cause the stack of plywood to slide, (b)
the acceleration of the truck which causes corner A of the stack to reach the end of the
bed in 0.9 s.
40
Asst. Prof. Dr. Waleed Al-Ashtari
College of Engineering / University of Baghdad
Dynamics
2 m
120
4- Knowing that the system shown starts from rest, find the velocity at t = 1.2 s of (a)
collar A, (b) collar B. Neglect the masses of the pulleys and the effect of friction.
10 kg
15 kg
5- A 60-kg wrecking ball B is attached to a 15-m-long steel cable AB and swings in the
vertical arc shown. Determine the tension in the cable (a) at the top C of the swing, (b)
at the bottom D of the swing, where the speed of B is 4.2 m/s.

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