A 20 kg mass is attached by a string to a 10 kg mass as shown below. Both masses are made of the same material. A hand pulls on the system and gives it an acceleration of 2.0 m/s². The tension in the rope at point P is 70 N. What is the coefficient of friction between the masses and the surface? 2.0 m/s² a) 0.15 b) 0.20 c) 0.43 d) 0.57 20 kg P 10 kg

A 20-ton truck collides with a 1500-lb car and causes a lot of damage to the car. During the collision × the force that the truck exerts on the car is much greater than the force that the car exerts on the truck the car and the truck have the same magnitude acceleration. the force that the car exerts on the truck is slightly greater than the force that the truck exerts on the car the force that the car exerts on the truck is exactly equal to the force that the truck exerts on the car

A) 10 kg m B) I kg.m C) 100 kg.m 9 and 10) 2-kg weight which is attached to a 1.5 m length string, is released from rest when it is at position A. Determine a) its specd and b) the tension in the cord when the bob passes through its lowest position, B. 9) Speed A) 1.25 m/s B) 2.28 m/s C) 3.98 m/s D) 4.56 m/s E) 5.42 m/s 1.5 m 10) Tension A) 51.96 N B) 58.90 N B C) 66.26 N D) 89.89 N E) 95.12 N

25. A new amusement park ride is shown in the diagram. 10 m C The mass of the small car, including its contents, is 400 kg. and the radius of the loop is 10 m. Assume that the track is frictionless and that no mechanism holds the car in contact with the track. (a) In order that the car stay on the track at B, what minimum velocity must it have at that point? (b) From what minimum height, h, must the car start from rest in order to do this? (c) is the mass of the car a factor in determining ? Explain. one over over a light, fric