A warehouse worker exerts a constant horizontal force of magnitude 85 N on a 40 kg box
Question:
Step by Step Answer:
Probably the most appropriate picture in the textbook to represent the situation in this pro...View the full answer
Fundamentals of Physics
ISBN: 978-0471758013
8th Extended edition
Authors: Jearl Walker, Halliday Resnick
Related Video
Static friction and kinetic friction are two types of friction that occur when two objects are in contact with each other. Static friction is the force that must be overcome to initiate motion between two surfaces that are in contact with each other but are not moving relative to each other. It is caused by the interlocking of rough surfaces at the microscopic level, and it increases as the force pushing the surfaces together increases. Once motion between the surfaces starts, the static friction is no longer present. Kinetic friction, also known as sliding friction, is the force that opposes the motion of two surfaces that are in contact with each other and are moving relative to each other. It is caused by the rubbing of the surfaces against each other and the resistance of the molecules in the surfaces to being moved. Kinetic friction is generally less than static friction, but it can still be a significant force, especially at high speeds. Both static and kinetic friction can be quantified using a coefficient of friction, which is a dimensionless number that represents the ratio of the frictional force between two surfaces to the normal force (the force perpendicular to the surfaces). The coefficient of static friction is typically greater than the coefficient of kinetic friction for a given pair of surfaces, because it takes more force to overcome the interlocking of the surfaces at rest than to maintain motion once it has started.
Students also viewed these Mechanics questions
-
A bomb that is initially at rest at the origin explodes and breaks into two pieces of mass m 1 = 1500 kg and m 2 = 2500 kg as shown in Figure P7.50. If piece 1 has a velocity of +35 m/s directed...
-
A spaceship is initially at rest in the lab frame. At a given instant, it starts to accelerate. Let this happen when the lab clock reads t = 0 and the spaceship clock reads t0 = 0. The proper...
-
A 0.42 kg shuffleboard disk is initially at rest when a player uses a cue to increase its speed to 4.2 m/s at constant acceleration. The acceleration takes place over a 2.0 m distance, at the end of...
-
A strain of E-coli Beu 397-recA441 is placed into a nutrient broth at 30° Celsius and allowed to grow. The data shown in the table are collected. The population is measured in grams and the time...
-
From the balance sheet accounts listed below: a. Construct a balance sheet for 2013 and 2014. b. List all the working capital accounts. c. Find the net working capital for the years ending 2013 and...
-
Suppose the market for T-shirts in the country of Argonia is perfectly competitive, and the price of a T-shirt is $20. A producer in this market has the following total cost and marginal cost...
-
The life span (in kilometers) for a population of a new brand of tires can be approximated by a normal distribution, with a mean of 80,000 kilometers and a standard deviation of 1,500 kilometers. (a)...
-
Hunter McNeal is studying and evaluating Branyons internal controls related to the mathematical verification of sales invoices. In this verification, Branyons control policies require that employees...
-
Problem No. 1 Design Member ab 1. Use A36 steel. 2. All truss members are long legs back-to-back angles. 3. At each joint, truss members are connected by 3/4" thick gusset plates. 4. Assume three...
-
The common-size balance sheets from four companies follow: Amazon.com, an Internet book retailer; Alcoa, a major producer of aluminum products; Wendys, a fast-food services organization; and Delta...
-
A trunk with a weight of 220 N rests on the floor. The coefficient of static friction between the trunk and the floor is 0.41, and the coefficient of kinetic friction is 0.32. (a) What is the...
-
Imagine that the standard kilogram is placed on Earth's equator, where it moves in a circle of radius 6.40 x 106 m (Earth's radius) at a constant speed of 465 m/s due to Earth's rotation. (a) What is...
-
Alan consumes both tea and coffee. His weekly budget for coffee and tea is $10. Tea always costs $1 per cup. Coffee is normally $2 per cup. This week Alan's cafeteria runs a promotional campaign: if...
-
If a woman who is not married becomes pregnant, do you think she and the father should have equal rights with respect to the child? Is your thinking influenced by the circumstances? For example, does...
-
The principle of work and energy is derived from Newton's second law integrated over time. Indicate whether the statement presented is true or false. If true, state why. If false, rewrite the...
-
What role did \(x\)-rays play in the rediscovery of child abuse in the 1960 s?
-
Assume that you are conducting an initial client interview with a client who is involved in a custody dispute with her husband, and that you become fairly certain the client is lying to you. What do...
-
Do you think mediation is appropriate in cases involving domestic violence? What about cases not involving violence, but where there is a significant power imbalance between the spouses?
-
In theory, in the national income and product accounts, income should equal expenditures. However, when we add up income from various sources, it differs from expenditures, in part because the...
-
Copy and complete the statement. 3800 m ? km =
-
Explain why it is not possible to add a scalar to a vector.
-
In the sub-shell l = 3, (a) What is the greatest (most positive) ml value? (b) How many states are available with the greatest ml value? (c) What is the total number of states available in the...
-
An electron is in a state with l = 3. (c) What is the largest possible value of ml, (d) What multiple of h gives the corresponding value of Lz, (e) What multiple of B gives the corresponding value of...
-
What is the probability that, at a temperature of T = 300 K, an electron will jump across the energy gap Eg (= 5.5 eV) in a diamond that has a mass equal to the mass of Earth? Use the molar mass of...
-
A nursing team is having a routine meeting. One of the nurses, Stephen, is at the end of a 12-hour shift, and another nurse, Tanya, is just beginning hers. Tanya is a senior nurse in the unit with...
-
Assume that you are the leadership team of a convenience store chain that has more than 300 outlets. The company is facing an inventory shrinkage problem, and store managers report that the main...
-
1 . An employee at Amy's candles has noticed that some order quantities in the two reports presented are different although the order numbers are the same. We normally refer to such data as dirty....
Study smarter with the SolutionInn App