12–121. The car passes point A with a speed of 25 m/safter which its speed is defined by v = (25 – 0.15s) m/s.Determine the magnitude of the car's acceleration when itreaches point B, where s = 51.5 m and x = 50 m.12–122. If the car passes point A with a speed of 20 m/sand begins to increase its speed at a constant rate ofa, = 0.5 m/s?, determine the magnitude of the car's%3Dacceleration when s = 101.68 m and x = 0.y = 16 – 625'B

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Answered: 12–121. The car passes point A with a…

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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Starting from rest the motorboat travels around the circular path with radius of curvature 50 m, at a speed V= 0.8t m/s, where t is in seconds. Determine the magnitudes of the boat's velocity and acceleration when it has traveled 20 m. p = 50 m
A block moves outward along the slot in the platform with a speed of r = (4t) m/s, where t is in seconds. The platform rotates at a constant rate of 6 rad/s. If the block starts from rest at the center, determine the magnitude of its velocity when t = 2s. 0 6 = 6 rad/s T
h M = 5t 2 If the motor pulls the rope at a speed of Um m/s, where t is in seconds. Determine the velocity of cylinder A when t = 2.65 s.
12–149. The train passes point B with a speed of 20 m/s which is decreasing at a, = - 0.5 m/s². Determine the magnitude of acceleration of the train at this point. 12–150. The train passes point A with a speed of 30 m/s and begins to decrease its speed at a constant rate of a,=- 0.25 m/s².Determine the magnitude of the acceleration of the train when it reaches point B, where sAB = 412 m. y = 200 e 1000 A х -400 m
Determine the velocity and acceleration of a body after 3 secs, if the motion is defined by the relation s = 5t + 4 t^3, s being in ft and t in seconds.
The sprinter begins from rest at position A and accelerates along the track. If the stationary tracking camera at O is rotating counterclockwise at the rate of 16.4 deg/s when the sprinter passes the 54-m mark, determine the speed v of the sprinter and the value of r Find the speed v of the runner.
The tangential acceleration of the centrifuge is given by a = 0.5 t m/s/s where t is in seconds. If the centrifuge starts from rest, determine the normal acceleration ( m/s/s ) of the centrifuge after 10 s. The radius of the centrifuge is 8m.
Collars A andB slide along the fixed right-angle rods and are connected by a cord of length L = 6.9 m. Determine the acceleration of collar B when y = 2.3 m if collar A is given a constant upward velocity vĄ = 1.61 m/s. The acceleration of B is positive if to the right, negative if to the left. Answer: aB = i m/s2
12–154. If the speed of the crate at A is 15 ft/s, which is increasing at a rate v = 3 ft/s² , determine the magnitude of the acceleration of the crate at this instant. y 16 10 ft
An automobile is traveling on a curve having a radius of 242 m. If the acceleration of the automobile is 2m/s^2, determine the constant speed at which the automobile is traveling.

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