An object with mass m 10kg is pulled by a string with a force F with magnitude 20N at 300 above horizontal, and starts moving from rest. The kinetic friction coefficient between the surfaces is u = 0.1. (a) Find the normal force and friction exerted on the object. Normal force: N = IN Friction f =

An object with mass m 10kg is pulled by a string with a force F with magnitude 20N at 300 above horizontal, and starts moving from rest. The kinetic friction coefficient between the surfaces is u = 0.1. (a) Find the normal force and friction exerted on the object. Normal force: N = IN Friction f =

Name: QUESTION 18An object with mass m 10kg is pulled by a string with a fo
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Description: QUESTION 18An object with mass m 10kg is pulled by a string with a force F with magnitude 20N at 30° above horizontal, and starts moving fromrest. The kinetic friction coefficient between the surfaces is u = 0.1.(a) Find the normal force and frictio

College Physics

10th Edition

ISBN:9781285737027

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter4: The Laws Of Motion

Section: Chapter Questions

Problem 48P: A student decides to move a box of books into her dormitory room by pulling on a rope attached to...

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Calculate the normal force on a 15.0 kg block in the following circumstances: (a) The block is resting on a level surface. (b) The block is resting on a surface tilted up at a 30.0 angle with respect to the horizontal. (c) The block is resting on the floor of an elevator that is accelerating upwards at 3.00 m./s2. (d) The block is on a level surface and a force of 125 N is exerted on it at an angle of 30.0 above the horizontal. (Sec Section 1.5.)
If a single constant force acts on an object that moves on a straight line, the objects velocity is a linear function of time. The equation v = vi + at gives its velocity v as a function of time, where a is its constant acceleration. What if velocity is instead a linear function of position? Assume that as a particular object moves through a resistive medium, its speed decreases as described by the equation v = vi kx, where k is a constant coefficient and x is the position of the object. Find the law describing the total force acting on this object.
A block of ice (m = 15.0 kg) with an attached rope is at rest on a frictionless surface. You pull the block with a horizontal force of 95.0 N for 1.54 s. a. Determine the magnitude of each force acting on the block of ice while you are pulling. b. With what speed is the ice moving after you are finished pulling? Repeat Problem 71, but this time you pull on the block at an angle of 20.0.
A student decides to move a box of books into her dormitory room by pulling on a rope attached to the box. She pulls with a force of 80.0 N at an angle of 25.0 above the horizontal. The box has a mass of 25.0 kg, and the coefficient of kinetic friction between box and floor is 0.300. (a) Find the acceleration of the box. (b) The student now starts moving the box up a 10.0 incline, keeping her 80.0 N force directed at 25.0 above the line of the incline. If the coefficient of friction is unchanged, what is the new acceleration of the box?
In Example 4.6, we investigated the apparent weight of a fish in an elevator. Now consider a 72.0-kg man standing on a spring scale in an elevator. Starting from rest, the elevator ascends, attaining its maximum speed of 1.20 m/s in 0.800 s. It travels with this constant speed for the next 5.00 s. The elevator then undergoes a uniform acceleration in the negative y direction for 1.50 s and comes to rest. What does the spring scale register (a) before the elevator starts to move, (b) during the first 0.800 s, (c) while the elevator is traveling at constant speed, and (d) during the time interval it is slowing down?
Why is the following situation impossible? A 1.30-kg toaster is not plugged in. The coefficient of static friction between the toaster and a horizontal countertop is 0.350. To make the toaster start moving, you carelessly pull on its electric cord. Unfortunately, the cord has become frayed from your previous similar actions and will break if the tension in the cord exceeds 4.00 N. By pulling on the cord at a particular angle, you successfully start the toaster moving without breaking the cord.
A sleigh is being pulled horizontally by a train of horses at a constant speed of 8.05 m/s. The magnitude of the normal force exerted by the snow-covered ground on the sleigh is 6.37 103 N. a. If the coefficient of kinetic friction between the sleigh and the ground is 0.23, what is the magnitude of the kinetic friction force experienced by the sleigh? b. If the only other horizontal force exerted on the sleigh is due to the horses pulling the sleigh, what must be the magnitude of this force?
For the woman being pulled forward on the toboggan in Figure 4.33, is the magnitude of the normal force exerted by the ground on the toboggan (a) equal to the total weight of the woman plus the toboggan, (b) greater than the total weight, (c) less than the total weight, or (d) possibly greater than or less than the total weight, depending on the size of the weight relative to the tension in the rope?
A stockroom worker pushes a box with mass 13.5 kg on a horizontal surface with a constant speed of 3.00 m/s . The coefficients of kinetic and static friction between the box and the surface are 0.280 and 0.440, respectively. What horizontal force must the worker apply to maintain the motion of the box? (Express your answer in newtons. Assume that +x direction coincides with the direction of velocity.) If the worker stops pushing, what will be the acceleration of the box? (Express your answer in meters per second squared. Assume that +x direction coincides with the direction of velocity.)
"A worker drags a crate across a factory floor by pulling on a rope tied to the crate. The worker exerts a force of magnitude F = 300N on the rope, which is inclined at an upward angle q = 30° to the horizontal, and the floor exerts a horizontal force of magnitude f = 150N that opposes the motion. Calculate the magnitude of the acceleration (in the unit m/s2) of the crate if its mass is 200 kg."
A worker drags a crate across a factory floor by pulling on a rope tied to the crate. The worker exerts a force of magnitude F = 450 N on the rope, which is inclined at an upward angle u = 38 to the horizontal, and the floor exerts a horizontal force of magnitude f = 125 N that opposes the motion. Calculate the magnitude of the acceleration of the crate if (a) its mass is 310 kg and (b) its weight is 310 N.
A stubborn 146 kg mule sits down and refuses to move. To drag the mule to the barn, the exasperated farmer ties a rope around the mule and pulls with his maximum force of 604 N. The coefficients of friction between the mule and the ground are 0.800 for static friction and 0.500 for kinetic friction. Calculate the additional force (in N) that the farmer will need from his son in order to move the mule assuming that the local acceleration due to gravity is 9.80 m/s2.