20. During one launch, when the 4.0-gram marble is at the peak of its trajectory, moving to the right, the only forces acting on it are the force of gravity, and a 0.01 N force of drag to the left. Draw the free body diagram for this situation.
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- A 4.35 kg cat moves in a straight line (the x-axis). Find the maximum net force on this cat. When does the maximum net force on this cat occur? When is the net force on the cat equal to zero? What is the net force at time 8.5 s?tobonga or. 2. A1600 kg car is traveling with a speed of 15.0 m/s. What is the magnitude of the horizontal net force that is required to bring the car to a halt in a distance of 50 m? Ignore air resistance.A 60-kg skydiver is falling at a constant speed near the surface of Earth. The magnitude of the force of air friction acting on the skydiver is approximately1. 0 N2. 6 N3. 60 N4. 600 N
- Two forces, F1 and F2 (which is directed in the -x-direction), act on a 5.00-kg block as shown. The block slides horizontally. The magnitude of the forces are F1 = 50.0 N and F2 = 35.0 N. What is the horizontal acceleration (both magnitude and direction) of the block? (Assume that the block is on a frictionless surface.)A block of mass 3.00 kg is pushed up against a wall by a force P that makes a 50.0° angle with the horizontal as shown in Figure P5.53. The coefficient of static friction between the block and the wall is 0.250. Determine the possible values for the magnitude of P that allow the block to remain stationary. 50.0° Figure P5.53q7
- A clarinetist, setting out for a performance, grabs his 3.490 kg clarinet case (including the clarinet) from the top of the piano and carries it through the air with an upward force of 39.37 N. Find the case's vertical acceleration. Indicate an upward acceleration as positive and a downward one as negative. Use for ?=9.810 m/s2g for the acceleration due to gravity. vertical acceleration:57. QIC Three objects are connected on a table as shown in Figure P4.57. The coefficient of kinetic friction between the block of mass m, and the table is 0.350. The objects have masses of m₁ = 4.00 kg, m₂ = 1.00 kg, and ma = 2.00 kg as shown, and the pulleys are friction- less. (a) Draw a diagram of the forces on each object. (b) Determine the acceleration of each object, includ- ing its direction. (c) Determine the tensions in the two cords. (d) If the tabletop were smooth, would the ten- sions increase, decrease, or remain the same? Explain. my mo Figure P4.57 MgYou walk into an elevator, step onto a scale, and push the "up" button. You recall that your normal weight is 625 N. Draw a free-body diagram. When the elevator has an upward acceleration of magnitude 2.50 m/s2, what does the scale read? If you hold a 2.25 kg package by a light vertical string, what will be the tension in this string when the elevator accelerates as in the previous part?
- 5. A 78.5 kg person rides in a 606 kg elevator while standing on a scale calibrated in newtons. The elevator is traveling downward but slowing down at a rate of 2.45 m/s². (a) Draw the free-body diagram for the person (including the net force). (b) What does the scale read? (c) What is the tension in the elevator's single cable?A 2388-kg farm tractor tows a 3100-kg trailer up a 16° incline with a constant acceleration of 1.5 m/s2 upward along the incline. What force does the tractor exert on the trailer? Suppose the trailer experiences a constant rolling friction force of 456 N.