5. What is the speed of the ball at ground level just after the throw? (8.85...
Playing shortstop, you pick up a ground ball and throw it to
second base. The ball is thrown horizontally, with a speed of 26
m/s, directly toward point A (Figure 4-16). When the ball reaches
the second baseman 0.40 s later, it is caught at point B. (Neglect
air resistance.) Figure 4-16
(a) How far were you from the second baseman? m
(b) What is the distance of vertical drop, AB? m
A small bead with a mass m = 15.0 g slides along the
frictionless wire form shown in the figure. The three heights
hA = 7.70 m, hB = 5.50 m,
and hC = 2.90 m are all measured from the
floor. The bead is released from rest at point A.
a) What is the speed of the bead at points B and C?
vB
= ____ m/s
vC
= ____ m/s
(b) What is the net work done on...
A ball is kicked at ground level with an initial velocity of 18 m/s m the horizontal direction and 11 m/s in the vertical direction. At what speed doer the hall hit the pound in m/s? For how long does the ball remain in the air in seconds? What maximum height is attained by the ball in meters?
Let h = 25.5 m and vi = 11.8 m/s. Find the speed of the ball just before it hits the ground. vf = m/s Find the ball's mechanical energy at the release point. KEi + PEi = J Find the ball's mechanical energy just before it hits the ground. KEf + PEf = J Remarks Notice that the final speed does not depend on the initial release angle. Kinetic energy is not a vector. The initial kinetic energy of...
A ball, P is at point A at a height 2 m above the ground as
shown in the image. The ball's mass is 3 kg.
a) What is P:s potential enery above the ground? Use g=9.82
m/s^2
The ball is let go without speed from point A and slides down
the slippery circular surface AB.
b) What is the P:s kinetic energy at point B?
c) What is P:s velocity at point B?
Immediatly after point B, the ball,...
The drawing shows two frictionless inclines that begin at ground level (h = 0 m) and slope upward at the same angle θ. One track is longer than the other, however. Identical blocks are projected up each track with the same initial speed v0. On the longer track the block slides upward until it reaches a maximum height H above the ground. On the shorter track the block slides upward, flies off the end of the track at a height...
A skater is moving with a speed of 3.3 m/s when she is at a height of 5 m above the ground on the frictionless track below. Neglect the effects of air resistance. Use the conservation of energy to determine the skater’s speed when she is 2 m above the ground on her way down the track. Use the conservation of energy to determine the skater’s speed when she is 2 m above the ground on her way back up...
A ball is launched directly upward from ground level with an initial speed of 22 m/s. (Air resistance is negligible.) (a) How long is the ball in the air? 220/49 S (b) What is the greatest height reached by the ball? 1000149xm (c) How many seconds after launch is the ball 5 m above the release point? s after being thrown (first time) s after being thrown (second time) Be careful when assigning signs to the kinematic quantities. What is...
Q.2 - A ball, 5 m above the ground, is launched vertically downward with an initial speed vo = 4 m/s. Determine the speed of the ball at point A, just above the ground. Neglect air resistance. (VA = ?) *-*m/s oo - 22.503 m/s 45.889 m/s 10.770 m/s 1.316 m/s Q.4 - A force of kinetic friction fx = 5 N acts on a block for a distance d = 0A = 7 m. At point O, the block...
Sample Problems (Ch.5 Energy) 1A71.4 kg base runner begins his slide into second base when he is moving at a speed of 5-3 m/s. The coefficient of friction between his clothes and Earth is 0.78. He slides so that his speed is zero just as he reaches the base. (a) How much mechanical energy is lost due to friction acting on the runner? (b) How far does he slide? 2. A bead of mass m = 8.35 kg is released...