Center of mass and momentum Questions

23. Which of the following have greater momentum than a 12 kg ball rolling at 6 m/s?
Select all correct answers.
(a) A 40 kg ball that is stationary
(b) A 60 kg ball rolling at 3m/s
(c) A 30 kg ball rolling at 2m/s
(d) 18 kg ball rolling at 5m/s
24. A 1200

Physics

Center of mass and momentum

23. Which of the following have greater momentum than a 12 kg ball rolling at 6 m/s? Select all correct answers. (a) A 40 kg ball that is stationary (b) A 60 kg ball rolling at 3m/s (c) A 30 kg ball rolling at 2m/s (d) 18 kg ball rolling at 5m/s 24. A 1200 kg car travelling at 12m/s to the east collides with a 4000 kg truck that is initially at rest at a stoplight. The car and the truck stick together and move together after the collision. What is the final velocity of the two-vehicle mass? 25. A grocery shopper tosses a 10 kg bag of rice into a stationary 20 kg grocery cart. The bag hits the cart with a horizontal speed of 5m/s toward the front of the cart. What is the final speed of the cart and the bag? 26. A boy on a 1.8 kg skateboard initially at rest tosses a 6 kg jug of water in forward direction. If the jug has a speed of 2.6 m/s relative to the ground and the boy and the skateboard move in the opposite direction at 0.5 m/s, find the boy's mass. 27. A 48 kg student runs down the sidewalk and jumps with a horizontal speed of 3.8 m/s onto a stationary skateboard. The student and the skateboard move down the sidewalk with a speed of 3.9 m/s. Find the mass of the skateboard. 28. In problem 27, how fast the student would have to run initially to have a final speed of 4.9 m/s? 29. A 0.6 kg ball is thrown with a velocity of 18 m/s to the right. A stationary receiver catches the ball and brings it to rest in 0.03 s. What is the force exerted on the ball by the receiver? 30. A bumper car of mass of 80 kg is travelling at 3.5 m/s. A bumper car of 90 kg is travelling at 1.5 m/s in the opposite direction. After the collision, the 80 kg bumper car travels at -0.4 m/s. What is the speed of the 90 kg bumper car? 11. One of the acute angles of a right triangle is 37°. Determine the other angle as well as its Sine,Cosine and Tangent values. 12. What is the normal force of an object with mass 50 kg and sits on a table? 13. An object that is at rest on an incline. Which of the following forces is causing the object not to slide? (a) Gravitational force (b) Normal force (c) Frictional force (d) Applied force PIC.COLLAGE

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