A man who has a mass of 80 kg stands on a bathroom scale in a moving elevator . The reading on the scale is 85 kg . What direction is the elevator moving ? (Assume that the scale is in perfect working condition )
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A man who has a mass of 80 kg stands on a bathroom scale in a moving elevator . The reading on the scale is 85 kg . What direction is the elevator moving ? (Assume that the scale is in perfect working condition )
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- A makeshift sign hangs by a wire that is extended over an ideal pulley and is wrapped around a large potted plant on the roof as shown in Figure P6.10. When first set up by the shopkeeper on a sunny and dry day, the sign and the pot are in equilibrium. Is it possible that the sign falls to the ground during a rainstorm while still remaining connected to the pot? What would have to be true for that to be possible? FIGURE P6.10 Problems 10 and 11.A passenger is standing on a scale in an elevator. The building has a height of 500 feet, the passenger has a mass of 80 kg, and the scale has a mass of 7 kg. The scale sits on the floor of the elevator. (It is an Otis elevator, so we will label it as "O" so as not to confuse its forces with those caused by the earth.) You may take g = 10 N/kg. For doing this problem it might be useful to start by drawing free-body diagrams for the passenger and the scale. Consider the vertical forces acting on the passenger and the scale WE→P: The force of the earth pulling down on the passenger (weight). WE→S: The force of the earth pulling down on the scale (weight). NP→S: The force of the passenger pushing down on the scale (normal). NS→P: The force of the scale pushing up on the passenger (normal). NO→S: The force of the elevator pushing up on the scale (normal). NO→P: The force of the elevator pushing up on the passenger (normal). Which of these forces affect the motion of the passenger? Select…A passenger is standing on a scale in an elevator. The building has a height of 500 feet, the passenger has a mass of 80 kg, and the scale has a mass of 7 kg. The scale sits on the floor of the elevator. (It is an Otis elevator, so we will label it as "O" so as not to confuse its forces with those caused by the earth.) You may take g = 10 N/kg. For doing this problem it might be useful to start by drawing free-body diagrams for the passenger and the scale. a) The elevator now begins to descend. Starting from rest, it takes the elevator 6 seconds to get up to its downward speed of 12 m/s. Assuming that it is accelerating downward at a uniform rate during these 6 seconds, what is the acceleration? b) While it is accelerating downward, what does the scale read (in newtons)?
- A 1,380-N crate is being pushed across a level floor at a constant speed by a force of 390 N at an angle of 20.0° below the horizontal. Two figures show a side view of a crate positioned upon a horizontal surface. Figure (a): An arrow pointing downward and to the right is labeled vector F and forms an angle of 20° below the horizontal as it approaches the upper left edge of the crate. Figure (b): An arrow pointing upward and to the right is labeled vector F and forms an angle of 20° above the horizontal as it extends from the upper right edge of the crate. (a) What is the coefficient of kinetic friction between the crate and the floor? (b) If the 390-N force is instead pulling the block at an angle of 20.0° above the horizontal, as shown in the figure b, what will be the acceleration of the crate? Assume that the coefficient of friction is the same as that found in part (a).A heavy crate is suspended from two ropes as it is lowered from a high shelf to the floor at a constant speed. One of the ropes makes an angle of 26.5 degrees with respect to the vertical and has a tension of 653 N, while the other makes an angle of 31.5 with respect to the vertical. What is the crate's mass in kg?A passenger is standing on a scale in an elevator. The building has a height of 500 feet, the passenger has a mass of 80 kg, and the scale has a mass of 7 kg. The scale sits on the oor of the elevator. You may take g = 10 N/kg. While it is accelerating downwards hat does the scale read (in newtons
- An accident victim with a broken leg is being placed in traction. The patient wears a special boot with a pulley attached to the sole. The foot and boot together have a mass of 4.0 kgkg, and the doctor has decided to hang a m� = 6.6 kgkg mass from the rope. The boot is held suspended by the ropes and does not touch the bed. (Figure 1) Determine the amount of tension in the rope by using Newton’s laws to analyze the hanging mass. Assume that ϕ� = 11 ∘∘ .Hint: If the pulleys are frictionless, which we will assume, the tension in the rope is constant from one end to the other. The net traction force needs to pull straight out on the leg. What is the proper angle θ� for the upper rope? What is the net traction force pulling on the leg?A cart with mass 15.0 kg moves in a straight line on a frictionless horizontal surface. Take this surface to be along the x-axis. The cart has an initial speed of 8.00 m/s and it was pushed 5.00 m in the same direction as the initial velocity by an external force with a magnitude of 20.0 N. What is the cart's final speed?A skateboard with mass of 50kg is pulled without friction across the ground by a rope that makes an angle of 20 degrees with the horizontal. What force on the rope would be required to move the skateboard at a constant speed of 20 m/s?
- A girl has a 14 kg wagon. If she pushes from behind at an angle of the 30 degrees with a force of 60 N, she finds she can push the sled with a constant speed when she pulls on the handle, it makes an angle of 30 degrees to the ground. If she pulls with the same force, how fast will the wagon accelerate?You are standing on a scale in an elevator. While the elevator is at rest, the scale reads 650 N. The elevator begins to move with a downward velocity. If the elevator is increasing in speed (speeding up), what will happen to the weight reading displayed by the scale? The scale will measure a weight equal to 650 N O The scale will measure a weight greater than 650 N O The scale will measure a weight exactly equal to 0 N The scale will measure a weight less than 650 NA robot with fancy wheels is trained to move in two directions simultaneously. The force in the forward direction is 10 N and the force in the horizontal direction is 8 N. If the robot starts from rest, has a mass of 75 kg and travels for 100 seconds, what is the magnitude of the robot's final displacement?