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Chapter 4: Q29P (page 85)
A projectile鈥檚 launch speed is five times its speed at maximum height. Find launch angle.
The launch angle
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A certain airplane has a speed ofand is diving at an angle ofbelow the horizontal when the pilot releases a radar decoy (Fig. 4-33). The horizontal distance between the release point and the point where the decoy strikes the ground is(a) how long is the decoy in the air? (b)How high was the release point?
For women鈥檚 volleyball the top of the net is 2.24above the floor and the court measures 9.0mby 9.0 m on each side of the net. Using a jump serve, a player strikes the ball at a point that is 3.0m above the floor and a horizontal distance of 8.0m from the net. If the initial velocity of the ball is horizontal, (a) what minimum magnitude must it have if the ball is to clear the net and (b) what maximum magnitude can it have if the ball is to strike the floor inside the back line on the other side of the net?
A rifle that shoots bullets atis to be aimed at a target away. If the center of the target is level with the rifle, how high above the target must the rifle barrel be pointed so that the bullet hits dead center?
A golf ball is struck at ground level. The speed of the golf ball as a function of the time is shown in Figure, whereat the instant the ball is struck. The scaling on the vertical axis is set byand. (a) How far does the golf ball travel horizontally before returning to ground level? (b) What is the maximum height above ground level attained by the ball?
A radar station detects an airplane approaching directly from the east. At first observation, the airplane is at distancefrom the station and at angle above the horizon (Fig. 4-49). The airplane is tracked through an angular changein the vertical east鈥搘est plane; its distance is then. Find the (a) magnitude and (b) direction of the airplane鈥檚 displacement during this period.
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