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- a. A bullet of mass m is fired into a block of mass M that is at rest. The block, with the bullet embedded, slides distance d across a horizontal surface. The coefficient of kinetic friction is mk. Find an expression for the bulleť's speed v bullet. b. What is the speed of a 10 g bullet that, when fired into a 10 kg stationary wood block, causes the block to slide 5.0 cm across a wood table?A 75.0 kg ice skater moving at 8.50 m/s crashes into a stationary skater of equal mass. After the collision, the two skaters move as a unit at 4.25 m/s. If the impact time is 0.140 s, what are the magnitudes of the average forces experienced by each skater during the collision? Force experienced by moving skater Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. N Force experienced by stationary skater Suppose the average force a skater can experience without breaking a bone is 4500 N. Does a bone break? Yes NoA block of mass m1 = 16 kg slides along a horizontal surface (with friction, μk = 0.21) a distance d = 2.25 m before striking a second block of mass m2 = 9.75 kg. The first block has an initial velocity of v = 7.25 m/s. A: Assuming that block one stops after it collides with block two, what is block two's velocity after impact in m/s? B: How far does block two travel, d2 in meters, before coming to rest after the collision?
- Just before a bouncy ball hits a wall, it is traveling parallel to the ground at 18 m/s, and it then bounces directly backwards at 17 m/s. The interaction time with the wall was 0.40 ms (4.0 x 10-4 s). If the ball's mass is 0.17 kg, what is the average magnitude of the force of the wall on the ball during their interaction? A. 7700 N B. ON C. 7200 N D. 15000 N O A BProblem 9.34 A0.060-kg tennis ball, moving with a speed of 5.8 m/s , has a head-on collision with a 9.5x10-2-kg ball initially moving in the same direction at a speed of 2.7 m/s. Part A Assuming a perfectly elastic collision, determine the speed of each ball after the collision. Enter your answers numerically separated by a comma. Express your answers using two significant figures. Hνα ΑΣφ ? m/s 'tennis ball Vhall= Submit Previous Answers Request Answer X Incorrect; Try Again; 2 attempts remaining Part B Determine the direction of tennis ball after the collision. The tennis ball moves in the direction of its initial motion. The tennis ball moves in opposite direction. Subm Previous Answers v Correct Part C МacВook ProIf momentum is conserved in a collision, does this indicate conclusively that the collision is elastic? Explain. A.Yes, momentum is conserved only in an elastic collision. B. No, momentum is conserved only in inelastic collisions. C No, momentum is conserved in all collisions, elastic or inelastic.
- A 3.4 kg block of wood sits on a frictionless table. A 3.0 g bullet, fired horizontally at a speed of 480 m/s, goes completely through the block, emerging at a speed of 250 m/s. Part A What is the speed of the block immediately after the bullet exits? Express your answer with the appropriate units. V= Value Submit μA Provide Feedback Request Answer Units ? 208Train cars are coupled together by being bumped into one another. Suppose two loaded train cars are moving toward one another, the first having a mass of 170,000 kg and a velocity of 0.300 m/s, and the second having a mass of 105,000 kg and a velocity of -0.120 m/s. (The minus indicates direction of motion.) What is their final velocity (in m/s)? 38400 X m/s Additional Materials O ReadingWhat is the acceleration of a 4700 kg rocket taking off from the moon, where the acceleration of gravity is only 1.6 m/s2, if the rocket expels 8.00 kg of gas per second at an exhaust velocity of 2.20 x 103 m/s? m/s2 Additional Materials O Reading
- A 300-kg flatcar 29 mm long is moving with a speed of 7.0 m/s along horizontal frictionless rails. A 90-kg worker starts walking from one end of the car to the other in the direction of motion, with speed of 3.0 m/s with respect to the car. Part A In the time it takes for him to reach the other end, how far has the flatcar moved?phyPlease asap