Part A An air-track cart with mass m = 0.25 kg and speed vo = 1.5 m/s approaches two other carts that are at rest and have masses 2m and 3m, as indicated in (Figure 1). The carts have bumpers that make all the collisions elastic. Find the final speed of cart 1, assuming the air track extends indefinitely in either direction. Express your answer to two significant figures and include appropriate units. ΜΑ Figure Το v = 0 v=0 m 2m 3m -0.4 m/s 1 of 1 Submit Previous Answers Request Answer X Incorrect; Try Again; 5 attempts remaining Part B
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- A 0.14-kg baseball is dropped from rest from a height of 22 m above the ground. What is the magnitude of its momentum just before it hits the ground if we neglect air resistance? Use g = 9.8 m/s2Part L A 2.40 kg can of coffee moving at 1.50 m/s in the +x-direction on a kitchen counter collides head-on with a 1.20 kg box of macaroni that is initially at rest. After the collision the can of coffee is moving at 0.825 m/s in the +x-direction. What is the velocity (magnitude and direction) of the box of macaroni after the collision? Express your answer to three significant figures and include the appropriate units. Enter positive value if the box is moving in the +-direction and negative value if the box is moving in the -z-direction. μà C ? VB2 = Value Units Submit Request Answer Part M What is the kinetic energy of the can before the collision? Express your answer with the appropriate units. μA ? KC1 = Value Units Submit Request AnswerI Review Constants Particle A has half the mass and eight times the kinetic energy of particle B. Part A What is the speed ratio va/vB? VA/VB = Submit Previous Answers Request Answer Provide Feedback Next >
- At time t₁ = 12 s, a car with mass 1200 kg is located at (116, 0, 24) m and has momentum (4000, 0, −3600) kg. m/s. The car's momentum is not changing. At time t₂ = 17 s, what is the position of the car? Your answer cannot be understood or graded. More Information mA spring with relaxed length 0.30 m and spring constant 1.8 N/m rests horizontally on a frictionless table and is anchored frmly to a wall on one side. You press a 400 g block into the other side until the spring length is 0.16 m and then let go. a.) What will the momentum of the block be when it departs from the spring? (Assume contact ceases when the spring is relaxed.) b.) If the table were no longer frictionless and the block-table interface had a kinetic coeffcient of friction of 0.1 what then would the momentum of the block be when it departs from the spring?Two carts are initially moving to the right on a low-friction track, with cart 1 behind cart 2. Cart 1 has a speed twice that of cart 2 and so moves up and rear-ends cart 2, which has twice the inertia of cart 1. A. Suppose that the the initial speed of cart 2 is v. What is the speed of cart 1 right after the collision if the collision is elastic? Express your answer in terms of v. B.What is the speed of cart 2 right after the collision if the collision is elastic? Express your answer in terms of v.
- Two identical 0.800 kg masses are pressed against opposite ends of a light spring of force constant 1.75 N/cm, compressing the spring by 29.0 cm from its normal length. Part A Find the speed of each mass when it has moved free of the spring on a frictionless, horizontal table. Express your answer with the appropriate units. v= O Submit μA Value Request Answer Units ?A-C thank you!You head to Lake Charles for a spring break and win big at roulette. You decide to spend your winnings on a motorcycle. This 1800 N bike can go from 0 to max speed in 3 seconds.a. If the bike’s change in momentum is 4600 kg m/s, what is the max speed attained? b. What average force does the bike output to attain this change in momentum?
- In a cheerleading competition, the 65.0 kg cheerleader is tossed vertically upward with a speed of 3.75 m/s. a. What is the change in momentum of the cheerleader from the momentum she was tossed up to just before being caught assuming she was caught at the same height as she was thrown? b. What is her change in momentum if she was caught 0.52 m below the point of release?Part A A 20.0-kg projectile is fired at an angle of 60.0 ° above the horizontal with a speed of 80.0 m/s. At the highest point of its trajectory, the projectile explodes into two fragments with equal mass, one of which falls vertically with zero initial speed. You can ignore air resistance. How far from the point of firing does the other fragment strike if the terrain is level? ? d = m Submit Request Answer Part B How much energy is released during the explosion? ΑΣφ ? E = J Submit Request AnswerAt a road intersection, a 1200 kg car travelling southward at 18.0 m/s collides with a 975 kg car travelling eastward at 33.3 m/s. As seen in the diagram below. The cars remain together after the collision. Determine the direction and speed that the damaged cars travel after they collide (ignore friction). N We S