A warehouse worker is about to close a large door, as shown in Fig. 4.1.Fig. 4.1(i) State, with a reason, which of the two positions, A or B, will enable him to close the doorwith least force.(ii) On another occasion, with the door in the position shown in Fig. 4.1, two workers eachpush on the door with the same force at the same time. One worker pushes at A, fromthe side seen in Fig. 4.1. The other worker pushes at B, from the other side of the door.Which way does the door move, if at all? Tick one box.the door closesthe door opensthe door remains in the same position

To determine: Least force to close the door

Answered: A warehouse worker is about to close a…

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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7. 8. If I kick a football, what are the action and reaction (from the point of view of Newton's 3rd Law)? A dog is sitting on a ramp between the ground and the entrance of a shed on some planet. The ramp pushes up and right on the dog with a normal force of 20 N. [Assume the dog is in equilibrium.] Since forces come in pairs, the other force which is paired (according to Newton's 3rd Law) with the mentioned normal force can be expressed as: (circle one word / phrase from each column to create the correct sentence.) with a friction force pulls pushes backward down the dog the Earth forward the ground the planet the ramp the shed The dog The Earth The ground The planet The ramp The shed left right up and backward and down and forward and left and right and up by from on to with with a gravitational force with a normal force with a tension equal to 20 N. greater than 20 N. less than 20 N.
A 1,040-N crate is being pushed across a level floor at a constant speed by a force F of 400 N at an angle of 20.0° below the horizontal. (a) What is the coefficient of kinetic friction between the crate and the floor? (Enter your answer to at least three decimal places.) (b) If the 400-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 90-kg man walks on a sawhorse, as shown below. The sawhorse is 2.0 m long and 1.0 m high, and its mass is 25.0 kg. Calculate the normal reaction force on each leg at the contact point with the floor when the man is 0.5 m from the far end of the sawhorse. (Hint: At each end, find the total reaction force first. This reaction force is the vector sum of two reaction forces, each acting along one leg. The normal reaction force at the contact point with the floor is the normal (with respect to the floor) component of this force.)
A 2-kg hanging mass (m,) is connected by a string over a pulley to a 20-kg block (m,) that is sliding on a 30° fixed inclined plane (see the figure below). If the pulley's mass and the mass of the string are negligible, and all surfaces are frictionless, the magnitude of the acceleration (in m/s?) of the moving system is: A. 7.14 В. 9.8 С. 5.93 D. 3.56 E. 0.48
An 80-50 kg dog lying on floor at rest. The coefficient of kinetic friction between the dog and the floor is μ = 0.2. Ignore static friction. If the dog is pulled by a person with a 200 N force as shown, determine the speed of the dog when t = 3 s. [Do NOT use the equations of motion i.e. Σ F ' = ma, directly; otherwise your solution to this qustion will receive a zero]. 60⁰ [RLOS 2.6B, 4.2B] P = 200 N
(c) A claw hammer can be used both to drive nails into a piece of wood and to get themback out (see figure 1b). The person in the image needs to exert a force of 50 Non the hammer to pull the nail loose. The handle is 25 cm long, and the distancebetween the handle and the head of the nail is 2.0 cm. Find the force the hammeris exerting on the wood (not the nail!). You may assume that the point where thehammer touches the wood is along the line of the handle. Hint: Start your answerwith a free-body diagram. May I have a detailed step by step explanation of this c) problem? Its for a hand in homework and I don't know how to solve it
With the use of a free body diagram or otherwise, calculate the initial acceleration of a rocket taking off vertically, which has a mass of 5000 kg if its motor produces a thrust 3820 kN. [You may take the acceleration due to gravity, g = 10 m s-2.]
A shopper in a supermarket pushes a loaded cart with a horizontal force of 10 N. The cart has a mass of 30 kg. (a) Ignoring friction, how far will it move in 3 s, starting from rest? (b) How far will it move in 3 s if the shopper places his 30 N child in the cart before he begins to push it?
. A pickup truck with mass of 1230 kg moving at 105 km/h stops within a distance of 53.0 m. (a) What is the direction and size of the force that acts on the truck? (b) How much more slowing force would be required to stop the truck in half the distance?
By pulling on a rope attached to the box, a clerk moves an Oreo crate with a mass of m down an aisle with a frictionless floor. Using force F, the clerk pulls the lever at an angle of 0(theta) to the horizontal. When there is friction, would it be easier for the cashier to press the Oreos downward and draw them upward? Show the evidence.
A 20 kg block lies on a smooth ramp that is inclined at 35°. What is the force, parallel to the ramp, would prevent the block from moving? (Assume 1 kg exerts a force of 9.8 N.)
Three boxes are being pushed across a frictionless surface by a horizontal force of size 284 N. Box 1 has mass 27 kg, box 2 has mass 8 kg, and box 3 has mass 18 kg. Calculate the normal force that box 1 exerts on box 2, in N. Make sure your answer is a positive number. This scenario is depicted below. (Please answer to the fourth decimal place - i.e 14.3225)

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