Exam 4: Dynamics: Newtons Laws of Motion

A system consisting of blocks, a light frictionless pulley, a frictionless incline, and very light connecting wires is shown in the figure. The wires pull on the left-hand blocks parallel to the surface of the ramp. The 9.0-kg block accelerates downward when the system is released gently from rest. (a) What is the magnitude of the acceleration of the 9.0-kg block? (b) What is the tension in the wire connecting the two blocks on the incline?

The figure shows a block of mass M hanging at rest. The light wire fastened to the wall is horizontal and has a tension of 38 N. The wire fastened to the ceiling is also very light, has a tension of 59 N, and makes an angle with the ceiling. Find the angle

A 10-kg object is hanging by a very light wire in an elevator that is traveling upward. The tension in the rope is measured to be 75 N. What are the magnitude and direction of the acceleration of the elevator?

If I weigh 741 N on Earth at a place where g = 9.80 m/s² and 5320 N on the surface of another planet, what is the acceleration due to gravity on that planet?

A 40-kg box is being pushed along a horizontal smooth surface. The pushing force is 15 N directed at an angle of below the horizontal. What is the magnitude of the acceleration of the crate?

Jason takes off across level water on his jet-powered skis. The combined mass of Jason and his skis is 75 kg (the mass of the fuel is negligible). The skis produce a forward thrust of 200 N and have a Coefficient of kinetic friction with water of 0.10. Unfortunately, the skis run out of fuel after only 41 S) How far from his starting point has Jason traveled when he finally coasts to a stop?

A driver in a 1000-kg car traveling at 24 m/s slams on the brakes and skids to a stop. If the coefficient of friction between the tires and the level road is 0.80, how long will the skid marks be?

A 55-kg box rests on a horizontal surface. The coefficient of static friction between the box and the surface is 0.30, and the coefficient of kinetic friction is 0.20. What horizontal force must be applied to the box to cause it to start sliding along the surface?

A 6.0-kg box slides down an inclined plane that makes an angle o with the horizontal. If the coefficient of kinetic friction is 0.40, at what rate does the box accelerate down the slope?

A 200-g hockey puck is launched at an initial speed of 16 m/s up a metal ramp that is inclined at a angle. The coefficients of static and kinetic friction between the hockey puck and the metal ramp are respectively. What vertical height does the puck reach above its starting point?

A 10-kg sign is held by two ropes as shown in the figure. What is the tension on rope A?

Three boxes rest side-by-side on a smooth, horizontal floor. Their masses are 5.0 kg, 3.0 kg, and 2.0 kg , with the 3.0-kg mass in the center. A force of 50 N pushes on the 5.0-kg box, which pushes against the other two boxes. What magnitude force does the 5.0-kg box exert on the 3.0-kg box?

A 5.0-kg block and a 4.0-kg block are connected by a 0.6 kg rod, as shown in the figure. The links between the blocks and the rod are denoted by A and B. A vertical upward force of magnitude F is applied to the upper block. The blocks and rod assembly are moving downward at constant velocity of 85 cm/s. (a) What is the magnitude of the applied force F? (b) What magnitude force does link A exert?

A 1200-kg car is pulling a 500-kg trailer along level ground. Friction of the road on the trailer is negligible. The car accelerates with an acceleration o What is the force exerted by the car On the trailer?

A 5.0-kg box slides on the surface on a ramp that rises at above the horizontal. The coefficient of kinetic friction between the box and the surface of the ramp is 0.60 . What are the magnitude and direction of the acceleration of the box if it is sliding (a) up the ramp, (b) down the ramp?

A 6.00-kg ornament is held at rest by two light wires that form angles with the vertical, as shown in the figure. An external force of magnitude F acts vertically downward on the ornament. The tension exerted by each of the two wires is denoted by T . A free-body diagram, showing the four forces that act on the box, is shown in the figure. If the magnitude of force F is 410 N, what is the magnitude of the tension T?

A flatbed truck is carrying a 20-kg crate up a sloping road. The coefficient of static friction between the crate and the bed is 0.40 , and the coefficient of kinetic friction is 0.30 . What is the maximum angle of slope that the truck can climb at constant speed if the crate is to stay in place?

A small car and a large SUV are at a stoplight. The car has a mass equal to half that of the SUV, and the SUV can produce a maximum accelerating force equal to twice that of the car. When the Light turns green, both drivers push their accelerators to the floor at the same time. Which vehicle Pulls ahead of the other vehicle after a few seconds?

A catcher stops a 0.15-kg ball traveling at 40 m/s in a distance of 20 cm. What is the magnitude of the average force that the ball exerts against his glove?