A man is standing in a room with a low ceiling. He has raised his arms and pushing against the ceiling with a force of 400 N. His mass is 89 kg. What force (in kN) does the floor exert on him?
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A man is standing in a room with a low ceiling. He has raised his arms and pushing against the ceiling with a force of 400 N. His mass is 89 kg.
What force (in kN) does the floor exert on him?
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- A bag of cement weighing 325 N hangs in equilibrium from three wires as suggested in Figure P4.23. Two of the wires make angles 1 = 60.0 and 2 = 40.0 with the horizontal. Assuming the system is in equilibrium, find the tensions T1, T2, and T3 in the wires. Figure P4.23 Problems 23 and 24.A 46 kg box is at rest on a horizontal floor. A 22 kg child sits on top of the box. A person pushes the box with a horizontal force of 90 N. The static force of friction between the box and the floor is 230 N. What is the magnitude of the net force on the box?Three boxes are lined up so that they are touching each other on a nearly frictionless plane. Box A has a mass of ?A=19.0 kg, box B has a mass of ?B=30.5 kg, and box C has a mass of ?C=53.0 kg. An external force ?⃗ pushes on box A toward the right, and the force that box B exerts on box C has a magnitude of 194 N. Ignore friction. What is the magnitude of the acceleration ? of the boxes?
- Two people are pushing a truck across a parking lot. The truck has a mass of about 2 × 103 kg. First, they take turns pushing. When Person A pushes the truck, the truck accelerates at a rate of 1 m/s2. When Person B pushes the truck, it accelerates at a rate of 2 m/s?. (a) Both people stand behind the truck and push in the same direction. What is the net force on the truck? At what rate will the truck accelerate? (b) Person A stands at the back of the truck and Person B stands at the front, and they push in opposite directions. What is the net force on the truck? At what rate will the truck accelerate? In what direction? For both (a) and (b), draw a picture indicating the forces applied by A and B as well as the motion of the truck.A stack of four textbooks sits on top of a desk. The mass of the bottom book is 5.0 kg, on top of which is a 4.5 kg book, then a 4.0 kg book, then a 3.5 kg book. What is the normal force exerted on each book?A force of magnitude 9.65 N pushes three boxes with mass M1=1.30 kg, and M2=3.20 kg, and M3=4.90 kg. what is the magnitude of the contact force that boxes 1 and 2 exert on each other? what is the magnitude of the contact force that boxes 2 and 3 exert on each other?
- Two people are pushing a stalled car, as the figure indicates. The mass of the car is 1850 kg. One person applies a force of 275 N to the car, while the other applies a force of 395 N. Both forces act in the same direction. A third force of 560 N also acts on the car, but in a direction opposite to that in which the people are pushing. This force arises because of friction and the extent to which the pavement opposes the motion of the tires. Find the acceleration of the car.Blocks with masses of 1.2 kg, 2.4 kg, and 3.0 kg are lined up in a row on a frictionless table. All three are pushed forward by a 14 N force applied to the 1.2 kg block. How much force does the 2.4 kg block exert on (a) the 3.0 kg block and (b) the 1.2 kg block?A tug-of-war match happens between Team Blue and Team Red. Each of Team Blue’s members has an average mass of 76 kg and exerts an average force of 1225 N horizontally. Each of Team Red’s members has an average mass of 78 kg and exerts an average force of 1275 N horizontally. What is the tension in the section of rope between the teams?
- a bird feeder that weighs 199.3 N. The feeder is supported by a vertical wire, which is in turn tied to two wires, each of which is attached to a horizontal support. The left wire makes a 60° angle with the support, while the right wire makes a 30° angle. What is the tension in each wire (in N)? (A) left wire, (B) right wire, (C)bottom wireTwo people are pushing a truck across a parking lot. The truck has a mass of about 2 × 10 kg. First, they take turns pushing. When Person A pushes the truck, the truck accelerates at a rate of 1 m/s?. When Person B pushes the truck, it accelerates at a rate of 2 m/s?(a) Both people stand behind the truck and push in the same direction. What is the net force on the truck? At what rate will the truck accelerate?(b) Person A stands at the back of the truck and Person B stands at the front, and they push in opposite directions. What is the net force on the truck? At what rate will the truck accelerate? In what direction?For both (a) and (b), draw a picture indicating the forces applied by A and B as well as the motion of the truck.A plate of cafeteria food is on a horizontal table. You push it away from you with a constant horizontal force of 14.0 N. The plate has a mass of 0.800 kg, and during the push it has an acceleration of 12.0 m/s2 in the direction you are pushing it. (a) What is the magnitude of the net external force on the plate during the push? (b) What are the magnitude and direction of the friction force that the table exerts on the plate during the push?
