VA student is experimenting with collisions and rolls ball A (mass m) at block B (mass m) with a velocity of VA. The coefficient of restitution is e and the kinetic coefficient of A B friction is Mk. Determine the time it takes for block B to come to rest after the collision. I Use Impulse-Momentum to Solve this Problem μk
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- a. A 0.14 kg baseball is hit by a bat. State 1 is just before being hit. State 2 is just after being hit. What is the impulse that the bat put on the ball to make this change happen? State 1 V₁-10i2j [m/s] 2 rad/s b. A 500 kg parade float is towed with a trailer hitch on a horizontal surface with negligible rolling resistance. The float starts from rest at time=0. The force that the trailer hitch applies to the float, F(t), is given by the graph below. What is the speed and direction of the center of gravity of the float at time=20 sec? Force [N] 500 0 -250 MTOT-500 kg R=1m State 2 10 no rolling resistance R=1m 5 rad/s V2=40i +30j [m/s] 15 20 F(t) time [sec] .XQ3 : A car of mass 1000 Kg collides with a wall The initial and final velocity of the car are Vi = 6 m/s , Vf = 20 m/s If the collision lasts 2 Sec Find the Impulse caused by the collision and the average net force entered on the car ?A basketball of mass m = 625g rolls off the hoop’s rim, falls from a height of 3.05 m to the court’s floor, and then bounces up to a height of 1.40 m. a. draw b. What are the magnitude and direction of the impulse delivered to the basketball by the floor? c. If the ball is in contact with the floor for 0.150 s, what is the average force exerted on the basketball by the floor?
- Cars are equipped with air bags to prevent occupants from colliding with a dashboard or windshield. A 50-kg person moving at 20 m/s will be considerably safer if their momentum is stopped by an air bag instead of by a dashboard or windshield. Why does an air bag contribute to the safety of the person? O It causes the momentum change and impulse experienced by the person to be less. O It causes the momentum change and the collision force to be less. O It causes the collision time to be greater and the collision force to be less. 23 24 25 26 27 28 29 30 31 32 Sign outA steel ball with mass 37.0 g is dropped from a height of 2.05 m onto a horizontal steel slab. The ball rebounds to a height of 1.50 m. ▼ ▾ Part A Calculate the impulse delivered to the ball during impact. Express your answer in newton seconds. DF ὕΠ ΑΣΦ 5 Submit Part B n Request Answer If the ball is in contact with the slab for a time of 1.50 ms, find the average force on the ball during impact. Express your answer in newtons. ΠΙΑΣΦ Submit ? Request Answer N.S ? NI x 45° kg-m/s Ball Wedge 45% A ball with a mass 3.09 kg falls straight down onto a 45° wedge that is rigidly attached to the ground. The ball is moving at a speed of v = 4.53 m/s when it strikes the wedge. Assuming that the collision is instantaneous and perfectly elastic, what is the absolute value of the recoil momentum that the Earth receives during this collision?
- Situation: A.71-kg billiard ball moving at 2.5m / s in the x-direction strikes a stationary ball of the same mass. After the collision, the first ball moves at 2.17m / s , at an angle of 30.0with respect to the original line of motionAssuming an elastic collision (and ignoring friction and rotational motion), answer the following questions to find the struck ball's momentum after the collision. a) Using the information from the problemdraw a picture of the collisonMake sure to include what happens before and after the collision. Label each known quantity . b) Calculate the initial momentum of the moving billiard ball in kg*m/s c) Calculate the initial momentum of the ball at rest in kg*m/sTwo objects (A and B) of equal mass collide elastically. Mass A is initially moving 5.0 m/s in the +x-direction prior to the collision. Mass B is initially moving 3.0 m/s in the –x-direction prior to the collision. After the collision, mass A will be moving with a velocity of 3.0 m/s in the –x-direction. What will be the velocity of mass B after the collision? a. 3.0 m/s in the +x-direction b. 5.0 m/s in the +x-direction c. 3.0 m/s in the –x-direction d. 5.0 m/s in the –x-directionDuring a neighborhood baseball game in a vacant lot, a particularly wild hit sends a 0.147 kg baseball crashing through the pane of a second-floor window in a nearby building. The ball strikes the glass at 15.5 m/s, shatters the glass as it passes through, and leaves the window at 10.5 m/s with no change of direction. What is the direction of the impulse that the glass imparts to the baseball? a. Neither of these b. Opposite the direction of the ball's motion c. In the direction of the ball's motion Calculate the magnitude of this impulse (a positive number). Impulse: ? N * s The ball is in contact with the glass for 0.0109 s as it passes through. Find the magnitude of the average force of the glass on the ball (a positive number). Average Force: ? N
- The x-component of a force on a 15-g golf ball by a golf club versus time is plotted in the attached figure. a. Find the x-component of the impulse, in newton-seconds, during the following interval: [50 msec, 100 msec] b. Find the change in the x-component of the momentum, in kilogram meters per second, during the following interval: [50 msec, 100 msec]A 99 g steel ball bearing rolls to the right at 172 cm/s and makes an elastic head-on collision with another steel ball bearing with a mass of 72 g that is initially at rest. After the collision, the 99 g ball moves at 48.47 cm/s. a.The final velocity of the 72 g ball bearing in SI units is b.A 0.055-kg egg falls off a table that is 1.2 m high and lands on a tile floor. Part A What is the impulse delivered to the egg by the floor? Assume that the positive direction is upward. Express your answer with the appropriate units. Part B The egg lands on its side, and at the instant of impact the part of the shell farthest from the floor is 40 mm above the floor. The collision continues until the center of mass is on the floor. Estimate the time interval over which the collision lasts, assuming that the speed of the center of mass of the egg drops to zero linearly in time. Express your answer with the appropriate units. Part C What is the average force exerted by the floor on the egg? Assume that the positive direction is upward. Express your answer with the appropriate units. Part D If the floor were carpeted, the collision time interval might be extended by as much as a factor of four as the carpet "gives" under the egg. What would the average force…