Which of the following is NOT an example of work?a. a windmill turning in the wind
b. a person sliding a box across the floor
c. a metal bar bracing a leaning brick wall
d. an air bag deploying in an automobile wreck

Answers

Answer 1

Answer: Work = (force) · (distance)

a). The wind does work on the windmill.

b). The person does work on the box.

c). The metal bar exerts force on the leaning wall,
but nothing moves, so there's no work done.

d). The explosive inflator does work on the airbag, and very soon
after that, the driver and passengers do work on it too.

Related Questions

A bus is traveling at 79.7 kilometers per hour east. How far does the bus travel in 1.45 hours?
Your shopping cart has a mass of 65 kilograms. In order to accelerate the shopping cart down an aisle at 0.30 m/s2 What force would you need to use or apply to the cart. I don't know how to solve this
4. Which of the following best describes Kinetic Energy?Stored energy due to positionEnergy of motionForce applied over a distanceA push or pull exerted on an object
Based on relative bond strengths, classify these reactions as endothermic (energy absorbed) or exothermic (energy released):Endothermic B2+C2-->2BC A+BC-->AB+C Exothermic AB+C-->AC+B A2+C2-->2AC A2+B2-->2AB
A stone thrown from a height of 5.72 meters hits the ground at 13.3, Calculate the initial speed. Neglect air resistance

About how long have wastewater treatment plants been in existence? about how long have wastewater treatment plants been in existence? 50 years 120 years 190 years 220 years 300 years

Answers

Wastewater treatment plants have been in existence for about 120 years.

The development of wastewater treatment plants began in the late 19th century, around the 1890s. The need for wastewater treatment arose as industrialization and urbanization led to increased pollution of water bodies due to the discharge of untreated sewage and industrial effluents.

The first modern wastewater treatment plant is often credited to the city of Paris, France, which constructed its first large-scale sewage treatment plant, known as the "Clichy-la-Garenne Sewage Farm," in 1889. This plant utilized biological treatment processes to remove organic matter from wastewater before discharging it into the Seine River.

Over the following decades, the importance of wastewater treatment became recognized, and more cities and municipalities around the world started investing in the construction of wastewater treatment plants. The development and advancement of treatment technologies continued throughout the 20th century, leading to more efficient and effective treatment processes.

Today, wastewater treatment plants play a critical role in protecting public health and the environment by treating and purifying wastewater before it is discharged back into natural water bodies or reused for various purposes. These plants use a combination of physical, chemical, and biological processes to remove pollutants and contaminants, ensuring that the water released is safe for the environment and human use.

In summary, wastewater treatment plants have been in existence for approximately 120 years, evolving from basic sewage farms to sophisticated facilities that are essential for maintaining water quality and sustainability in modern urban and industrialized areas.

To learn more about Wastewater treatment, here

brainly.com/question/32653122

#SPJ6

Water treatment plants have been in existence for almost 220 years

What is the final speed of a lion initially running at a speed of 30 m/s, if it accelerates ata rate of 3 m/s3 for 5 seconds?

Answers

The final speed of a lion running 30 m/s accelerates at a rate of 3 m/s3 for 5 seconds it’s 3.2

BY what factor does the kinetic energy of a moving body change when its speed is reduced to half? please help i have an exam and i need an answer

Answers

Answer:

Kinetic Energy = 1/2 mass*velocity^2

K=1/2mv^2

Therefore if you reduce the speed of an object by 1/2, K reduced to 1/4 its value.

A typical mirror in a person's house would be an example of a/an _______ mirror. A. convex
B. plane
C. angular
D. concave

Answers

In the question "A typical mirror in a person's house would be an example of a/an _______ mirror." The correct answer is plane (option B).
A plane mirror is a mirror with a flat refractive surface.
The image formed by a plane mirror is virtual, upright, the same distance from the mirror as the object's distance and the same size as the object.

Penn Foster Student's: Plane

A long coaxial cable consists of an inner cylindrical conductor with radius a and an outer coaxial cylinder with inner radius b and outer radius c. The outer cylinder is mounted on insulating supports and has no net charge. The inner cylinder has a uniform positive charge per unit length λCalculate the electric field
(a) At any point between the cylinders a distance r from the axis and
(b) At any point outside the outer cylinder.
(c) Graph the magnitude of the electric field as a function of the distance r from the axis of the cable, from r = 0 to r = 2c.
(d) Find the charge per unit length on the inner surface and on the outer surface of the outer cylinder.

Answers

Answer:

Part a)

$E = (\lambda)/(2\pi \epsilon_0 r)$

Part b)

$E = (\lambda)/(2\pi \epsilon_0 r)$

Part d)

As we know that due to induction of charge there will be same charge appear on the inner and outer surface of the cylinder but the sign of the charge must be different

On the inner side of the cylinder there will be negative charge induce on the inner surface and on the outer surface of the cylinder there will be same magnitude charge with positive sign.

Explanation:

Part a)

By Guass law we know that

$\int E. dA = (q)/(\epsilon_0)$

$E. 2\pi rL = (\lambda L)/(\epsilon_0)$

$E = (\lambda)/(2\pi \epsilon_0 r)$

Part b)

Outside the outer cylinder we will again use Guass law

$\int E. dA = (q)/(\epsilon_0)$

$E. 2\pi rL = (\lambda L)/(\epsilon_0)$

$E = (\lambda)/(2\pi \epsilon_0 r)$

Part d)

As we know that due to induction of charge there will be same charge appear on the inner and outer surface of the cylinder but the sign of the charge must be different

On the inner side of the cylinder there will be negative charge induce on the inner surface and on the outer surface of the cylinder there will be same magnitude charge with positive sign.

Final answer:

The electric field between the cylinders is given by E = λ / (2πε₀r). The electric field outside the outer cylinder is zero due to the absence of net charge. Graph the electric field magnitude using the equation E = λ / (2πε₀r). The inner surface charge of the outer cylinder is -λ and the outer surface charge is 0.

Explanation:

To calculate the electric field between the cylinders at a distance r from the axis, you can use Gauss's Law. Since the charging is uniform, the electric field will also be uniform. Therefore, the electric field at any point between the cylinders is given by E = λ / (2πε₀r), where ε₀ is the permittivity of free space.

To calculate the electric field at any point outside the outer cylinder, you can use the principle of superposition. The electric field due to the outer cylinder is zero because it has no net charge. The electric field due to the inner cylinder can be calculated using the same formula as before.

To graph the magnitude of the electric field as a function of the distance r from the axis, you can plot the equation E = λ / (2πε₀r) for values of r ranging from 0 to 2c.

The charge per unit length on the inner surface of the outer cylinder is -λ, while the charge per unit length on the outer surface of the outer cylinder is 0. This is because the outer cylinder has no net charge and the inner cylinder has a uniform positive charge per unit length λ.

Learn more about Electric Field here:

brainly.com/question/37315237

#SPJ11

Magnet A has twice the magnetic field strength of Magnet B and at a certain distance pulls on magnet B with a force of 100 N. The amount of force that magnet A exerts on magnet B is A. at or about 50 N. B. exactly 100 N. C. more information is needed.