answer #4 in detail please A block of wood is placed on an inclined plane making

Question

answer #4 in detail please

A block of wood is placed on an inclined plane making an angle of 30 degree with the horizontal and is just about to slide. What is the coefficient of static friction, mu_s? 5.1 0.8 0.51 we need to know the mass of the box. 0.58 What is the maximum speed for a car to safely negotiate a 20 degree banked curve of 50 m radius if there is a coefficient of static friction of 0.30? 19.1 m/s 5.93 m/s 17.1 m/s 35.2 m/s 26.1 m/s A stone is thrown horizontally outward from the top of a tower 30.0 m above the street below. The initial velocity of the stone is 10.0 m/s. What is the direction of the velocity of the projectile just before it strikes the street. 22.4 degree below the horizontal 0 degree below the horizontal 30.0 degree below the horizontal 90 degree below the horizontal 67.6 degree below the horizontal A ball is tossed from the window of a building. The ball is given an initial velocity of 8.0 m/s at an angle of 20 degree below the horizontal. It strikes the ground 3.0 s later. How far horizontally from the base of the building does the ball strike the ground? 67m 24 m 8.2 m 44 m 23 m

Explanation / Answer

4)  v = u + at
s = ut + (1/2)at^2

horizontal: u = 8cos20, a = 0, t = 3.00
s = ut = 3*8cos20 = 22.55 m = 23 m (option e)

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