Even when the head is held erect, as in Figure 9.42, its center of mass is not
Question:
Even when the head is held erect, as in Figure 9.42, its center of mass is not directly over the principal point of support (the atlanto-occipital joint). The muscles at the back of the neck should therefore exert a force to keep the head erect. That is why your head falls forward when you fall asleep in the class.
(a) Calculate the force exerted by these muscles using the information in the figure.
(b) What is the force exerted by the pivot on the head?
Step by Step Answer:
a Use the second condition for equilibrium ...View the full answer
University Physics with Modern Physics
ISBN: 978-0133977981
14th edition
Authors: Hugh D. Young, Roger A. Freedman
Related Video
In Physics, a force is an influence that can change the motion of an object. A force can cause an object with mass to change its velocity, i.e., to accelerate. Force can also be described intuitively as a push or a pull. A force has both magnitude and direction, making it a vector quantity. In this video, the concept of force and torque is demonstrated with the practical application of changing the flat tire of the car.
Students also viewed these Cost Accounting questions
-
The facts of this case are drawn from the SEC's Accounting and Auditing Enforcement The Company Perpetrating the Fraud The case involves a fraud perpetrated by MCA Financial Corporation, which was...
-
Late Thursday afternoon, Chris Peterson was reflecting on the meeting she would have tomorrow with her boss, Meg Cooke. The purpose of the meeting was to give Meg an update on the status of the...
-
In January, the board of directors of the Montgomery Corporation, one of Canada's largest retail store chains, was having its regularly scheduled meeting to establish and declare the next quarterly...
-
Simplify each expression in Problems 722. Classify each answer by number of terms and degree. 3(x5) 2(x + 8)
-
At time t = 0 and at position x = 0 m along a string, a traveling sinusoidal wave with an angular frequency of 440 rad/s has displacement y = +4.5 mm and transverse velocity u = 0.75 m/s. If the...
-
A pipeline containing natural gas from a hydraulic fracturing process contains 80% methane gas (CH 4 , species A) and 20% ethane (C 2 H 6 , species B) gas at 3.0 atm and 17 C, as shown in figure...
-
South Africa is one of the top gold producers in the world, holding about 6000 metric tons of reserves in mines as of 2015. Most mining operations have waste and by-products, some of which are...
-
For the past several years, Steffy Lopez has operated a part-time consulting business from his home. As of July 1, 2016, Steffy decided to move to rented quarters and to operate the business, which...
-
a. The company has one truck that it purchased at the start of this year. The truck cost $75,000, had an estimated useful life of five years and is expected to have zero value at the end of the five...
-
A graduating student keeps applying for jobs until she gets an offer. The probability of getting an offer at any trial is 0.35. a. What is the expected number of applications? What is the variance?...
-
Suppose a horse leans against a wall as in Figure 9.32. Calculate the force exerted on the wall assuming that force is horizontal while using the data in the schematic representation of the...
-
At its peak, a tornado is 60.0 m in diameter and carries 500 km/h winds. What is its angular velocity in revolutions per second?
-
1. Draw a diagram of the proposed payroll EDI and EFT system (you can use Figure 5-8 as a guide). 2. List and briefly describe any problems or issues that you think might arise in the implementation...
-
Compare and contrast the economic benefit doctrine and the constructive receipt doctrine.
-
When is the cost of transportation deductible as a medical expense?
-
Distinguish between current and accumulated E&P.
-
What is the distinction between deductions for adjusted gross income and deductions from adjusted gross income?
-
When are capital expenditures incurred for medical reasons deductible?
-
The oldest sediments found on the floor of the South Atlantic Ocean, which are 1300 km west of the axis of the Mid-Atlantic Ridge, were deposited about 70 million years ago. What rate of plate...
-
What is an insurable interest? Why is it important?
-
Use the information from the previous exercises involving JJ Manufacturing to determine their break-even point in sales dollars. Data from Exercise Set B 12 JJ Manufacturing builds and sells switch...
-
Use the information from the previous exercises involving Salvador Manufacturing to determine their break-even point in sales dollars. Data from problems Exercise Set A12 Salvador Manufacturing...
-
JJ Manufacturing builds and sells switch harnesses for glove boxes. The sales price and variable cost for each follows: Their sales mix is reflected in the ratio 4:4:1. If annual fixed costs shared...
-
3. (20 points) Consider three periodic tasks A, B and C with their respective periods as 4ms, 6ms and 8ms. The execution time required for each task is 1 ms. (a) Draw a figure/table to execute these...
-
Write a method (pseudocode) to reverse the queue using another empty queue. You may only use queue operations such as enqueue(), dequeue(), and size(). No other data structure can be used other than...
-
Solve the recurrence relation an = 7an-18an-2-9.2", with initial conditions ao = 5, a = 10. Show all your work.
Study smarter with the SolutionInn App