loint A of block travels downward with vi 3t\' l m/s. Find the velocity of point

Question

loint A of block travels downward with vi 3t' l m/s. Find the velocity of point B of block 3 when t 4 s. ey Two cars in a demolition derby are approaching a common point (the origin in the figure), each at 55 mph in a straight line as indicated. Car e, does not speed up or slow down, the driver of e, applies the brakes. Find the smallest rate of deceleration of e, that will barely avoid a collision if a. da 200 ft b, d, 100 ft If the 20kg block shown in the is released from res, find its speed after it has descended a distance d 5 m down the plane. The angle e- 60 and the (Coulomb) coefficients of friction are H, (static) 0.30 (kinetic 025 The curve AB on block B is a parabola whose vertex is at A. Its equation is 4 x (64/3)y. The block B is pashed to the left with a constant velocity of la fu/sec. The rod R slides on the parahola so that the plate P is forced upward. Find the acceleration of plate P 3ft. 8 ft After picking up passengers, a train accelerates uniformly until its speed is 100 km/hr at t If ing is traveling a path that approximates the circle and line shown in the the magnitude of the acceleration when (a) t 1 min and (bl t 2 min.

Explanation / Answer

Solving first question

As seen if block A travels y m the block B will travel y/2 m so

Velocity of block B =(velocity of block A)/2

At t=4 s,velocity of A=48 m/s

So velocity of B=24 m/s

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