A person of mass 85.0 kg is standing on a weighing scale inside an elevator. Three cases are shown below. In Case A, the elevator accelerates upwards, in case B, the elevator accelerates downward and in Case C, the elevator moves up with the constant velocity. a A In each of the scenarios, A, B, and C: B C 1. Draw a free body diagram showing all forces on the mass. Make sure to indicate which force is bigger by drawing a vector of larger length. 2. Choose a coordinate system and write Newton's Second Law in terms of all the forces. 3. The apparent weight of the person corresponds to which force on the person? 4. Calculate the apparent weight of the person if the magnitude of a

A person of mass 85.0 kg is standing on a weighing scale inside an elevator. Three cases are shown below. In Case A, the elevator accelerates upwards, in case B, the elevator accelerates downward and in Case C, the elevator moves up with the constant velocity. a A In each of the scenarios, A, B, and C: B C 1. Draw a free body diagram showing all forces on the mass. Make sure to indicate which force is bigger by drawing a vector of larger length. 2. Choose a coordinate system and write Newton's Second Law in terms of all the forces. 3. The apparent weight of the person corresponds to which force on the person? 4. Calculate the apparent weight of the person if the magnitude of a

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter6: Applications Of Newton's Laws

Section: Chapter Questions

Problem 39P: A student’s backpack, full of textbooks, is hung from a spring scale attached to the ceiling of an...

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Suppose two children push horizontally, but in exactly opposite directions, on a third child in a wagon. The first child exerts a force of 75.0 N, the second exerts a force of 90.0 N, friction is 12.0 N, and the mass of the third child plus wagon is 23.0 kg. (a) What is the system of interest if the acceleration of the child in the wagon is to be calculated? (See the free-body diagram.) (b) Calculate the acceleration. (c) What would the acceleration be if friction were 15.0 N?
Consider the 65.0-kg ice skater being pushed by two others shown below. (a) Find the direction and magnitude of Ftot . the total force exerted on her by the others, given that the magnitudes F1and F2are 26.4 N and 18.6 N, respectively. (b) What is her initial acceleration if she is initially stationary and wearing steel-bladed skates that point in the direction of Ftot ? (c) What is her acceleration assuming she is already moving in the direction of Ftot ? (Remember that friction always acts in the direction opposite that of motion or attempted motion between surfaces in contact)
(a) Give an example of different net external forces acting on the same system to produce different accelerations. (b) Give an example of the same net external force acting on systems of different masses, producing different accelerations. (c) What law accurately describes both effects? State it in words and as an equation.
A student’s backpack, full of textbooks, is hung from a spring scale attached to the ceiling of an elevator. When the elevator is accelerating downward at 3.8m/s2 , the scale reads 60 N. (a) What Is the mass of the backpack? (b) What does the scale read if the elevator moves upward while speeding up at a rate 3.8m/s2 ? (c) What does the scale read if the elevator moves upward at constant velocity? (d) If the elevator had no brakes and the cable supporting it were to break loose so that the elevator could fall freely, what would the spring scale read?
Commercial airplanes are sometimes pushed out of the passenger loading area by a tractor. (a) An 1800-kg tractor exerts a force of 1.75104 N backward on the pavement, and the system experiences forces resisting motion that total 2400 N. If the acceleration is 0. 150 m/s2, what is the mass of the airplane? (b) Calculate the force exerted by the tractor on the airplane, assuming 2200 N of the friction is experienced by the airplane. (c) Draw two sketches showing the systems of interest used to solve each part, including the free-body diagrams for each.
A weight lifter stands on a bathroom scale. He pumps a barbell up and down. What happens to the reading on the scale as he does so? What If? What if he is strong enough to actually throw the barbell upward? How does the reading on the scale vary now?
Two boxes, A and B, are at rest Box A is on level ground, while box B rests on an inclined plane tilted at angle with the horizontal. (a) Write expressions for the normal force acting on each block (b) Compare the two forces; that is, tell which one is larger or whether they are equal in magnitude. (c) If the angle of incline is 10 , which force is greater?
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Check Your Understanding (a) Draw the free-body diagram for the situation shown. (b) Redraw it showing components; use x -axes parallel to the two ramps.
If two tugboats pull on a disabled vessel, as shown here in an overhead view, the disabled vessel will be pulled along the direction indicated by the result of the exerted forces. (a) Draw a free-body diagram for the vessel. Assume no friction or drag forces affect the vessel. (b) Did you include all forces in the overhead view in your free-body diagram? Why or why not?
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