wooden box, has a mass of 8.60 kg and a coefficient of kinetic friction with the inclined plane of 0.35. Box 2, a cardboard box, sits on top of box 1. It has a mass of 1.30 kg. The coefficient of kinetic friction between the two boxes is 0.45. The two boxes are linked by a rope which pass1. A 75.0 kg man stands on a platform scale in an elevator. Starting from rest, the elevator ascends, attaining its maximum speed of 1.20 m/s in 1.00 s. It travels with this constant speed for the next 10.00 s. The elevator then undergoes a uniform acceleration in the negative y direction for 1.70 s and comes to rest. What does the scale register: (a) before the elevator starts to move? (1 mark) (b) during the first 1.00 s? (3 marks) (c) while the elevator is traveling at constant speed? (2 marks) (d) during the time it is slowing down? Take g = 10 ms-2. (4 marks) 2. Box 1, aes over a pulley at the top of the incline, as shown in the diagram. The inclined plane is at an angle of 38.0° with respect to the horizontal. (a) What is the acceleration of each box? (7 marks) (b) Now consider all surfaces are frictionless. Then calculate the amount of force with direction to prevent the sliding of the boxes. (3 marks) Page 1 of 2 3. An amusement park ride consists of a large vertical cylinder that spins about its axis fast enough such that any person inside is held up against the wall when the floor drops away. The coefficient of static friction between person and wall is 0.25 and the radius of the cylinder is 7m. (a) How many minimum revolutions per minute does the cylinder make? (5 marks) (b) Calculate the angular velocity and frequency of the motion at this condition. (2 marks) (c) What is the effect of the mass of the person on the time period, radial acceleration and tangential acceleration. (3 marks)

wooden box, has a mass of 8.60 kg and a coefficient of kinetic friction with the inclined plane of 0.35. Box 2, a cardboard box, sits on top of box 1. It has a mass of 1.30 kg. The coefficient of kinetic friction between the two boxes is 0.45. The two boxes are linked by a rope which pass1. A 75.0 kg man stands on a platform scale in an elevator. Starting from rest, the elevator ascends, attaining its maximum speed of 1.20 m/s in 1.00 s. It travels with this constant speed for the next 10.00 s. The elevator then undergoes a uniform acceleration in the negative y direction for 1.70 s and comes to rest. What does the scale register: (a) before the elevator starts to move? (1 mark) (b) during the first 1.00 s? (3 marks) (c) while the elevator is traveling at constant speed? (2 marks) (d) during the time it is slowing down? Take g = 10 ms-2. (4 marks) 2. Box 1, aes over a pulley at the top of the incline, as shown in the diagram. The inclined plane is at an angle of 38.0° with respect to the horizontal. (a) What is the acceleration of each box? (7 marks) (b) Now consider all surfaces are frictionless. Then calculate the amount of force with direction to prevent the sliding of the boxes. (3 marks) Page 1 of 2 3. An amusement park ride consists of a large vertical cylinder that spins about its axis fast enough such that any person inside is held up against the wall when the floor drops away. The coefficient of static friction between person and wall is 0.25 and the radius of the cylinder is 7m. (a) How many minimum revolutions per minute does the cylinder make? (5 marks) (b) Calculate the angular velocity and frequency of the motion at this condition. (2 marks) (c) What is the effect of the mass of the person on the time period, radial acceleration and tangential acceleration. (3 marks)