HW#10 Ch 4: Motion in Two and Three Dimensions
Instructions: Write the general equation before showing your work to earn full credit.
1. A kinetic energy penetrator is a type of ammunition fired by tank guns that uses kinetic energy to destroy a target. The penetrator round has an initial velocity of 1700 m/s and is fired horizontally. If the gun is 2.74 m above the ground, a) how long is the ammunition in the air? b) How far does it travel horizontally?
2. While Nolan Ryan was with the Texas Rangers, he regularly threw fastballs in excess of 161 km/h. If home plate is 18.4 m away, find how far the ball drops because of gravity by the time it reaches home plate. Neglect the spin of the ball and air resistance.
3. A hammer is thrown vertically upward with an initial velocity of 1.5 m/s from a height of 1.2 meters above the surface of the moon. If the moon’s gravity is 1.62 m/s2, how high above the surface does the hammer reach?
4. A racquetball is launched with an initial velocity of 5 m/s at 45° above the horizontal. At the ball’s highest point, a) what is its velocity? b) What is its acceleration?
5. A clay target used in skeet shooting is fired with an initial speed v at an angle of 30° above the horizontal from a height of 25 m above the ground. The target strikes the ground with a speed of 1.3v. Find v.