A 4900 kg open train car is rolling on frictionless rails at 18.6 m/s when it starts pouring rain. A few minutes later the car's speed is 15.4 m/s. What mass of water (in kg) has collected in the car?

A thin block of soft wood with a mass of 0.084 kg rests on a horizontal frictionless surface. A bullet with a mass of 4.67 g is fired with a speed of 603 m/s at a block of wood and passes completely through it. The speed of the block is 19 m/s immediately after the bullet exits the block. (a) Determine the speed (in m/s) of the bullet as it exits the block. in m/s (b) Determine if the final kinetic energy of this system (block and bullet) is equal to, less than, or greater than the initial kinetic energy. equal to the initial kinetic energy less than the initial kinetic energy     greater than the initial kinetic energy (c) Verify your answer to part (b) by calculating the initial and final kinetic energies of the system in joules. KEi =J KEf =J

The mass of a dog is 35.8 kg. The dog runs into a bouncy wall at 10.0 m/s and bounces back in the opposite direction at 1.75 m/s. What is the magnitude of the dog's impulse n kgm/s?

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 ball falls from height of 20.0 m, hits the floor, and rebounds vertically upward to height of 15.0 m. Assume that m ball = 0.385 kg. (a) What is the impulse (in kg. m/s) delivered to the ball by the floor? magnitude x direction 979.1 Assume the only impulse delivered to the ball is from the floor, which equals the change in momentum of the ball. Find the initial and final speeds of the ball using conservation of mechanical energy, and calculate Ap noting that all the motion is in the y-direction. kg. m/s up ✓✓ (b) If the ball is in contact with the floor for 0.0300 seconds, what is the average force (in N) the floor exerts on the ball? magnitude 19.223 x Use the impulse-momentum theorem and the result from part (a) to find the force, given that the contact time interval is 0.0300 s. N up direction ✓✓

A soccer ball of 4.40925 (2 kilosg) pounds moves to the right a speed of 0.5 m/s.  Hits a 0.1102311 (0.05 kilosg) pounds tennis ball initially moving to the left at 2 m/s.  The collision is elastic and takes place in one dimension, along the x axis. What is the speed of the center of mass, vcm?

A soccer ball of 4.40925 (2 kilosg) pounds moves to the right a speed of 0.5 m/s.  Hits a 0.1102311 (0.05 kilosg) pounds tennis ball initially moving to the left at 2 m/s.  The collision is elastic and takes place in one dimension, along the x axis. What is the approximate final speed of the tennis ball, vf,g?

A toy train engine (3.4 kg) is moving 0.25_m/s to the right when it collides with a train car (3.9.kg) moving 0.15 m/s in the opposite direction, and they stick together. Find the velocity of the engine-car combination as they move off together. Assume "to the right" is the positive direction. 0.04319_m/s В. 0.05252_m/s 0.0687_m/s 0.04904 m/s 0.03505_m/s F. А. D. Е. С. 0.0363_m/s

A car (mass = 1110 kg) is traveling at 31.3 m/s when it collides head-on with a sport utility vehicle (mass = 2380 kg) traveling in the opposite direction. In the collision, the two vehicles come to a halt. At what speed was the sport utility vehicle traveling?

A volleyball is spiked so that its incoming velocity of + 2.50 m/s is changed to an outgoing velocity of - 20.7 m/s. The mass of the volleyball is 0.350 kg. What is the magnitude of the impulse that the player applies to the ball?