What does viscosity describe? Question 4 options: A. a fluid's resistance to being heated
B. the rate of evaporation of a fluid
C. how much energy it takes to warm a fluid
D. the density of a fluid
E. a fluid's resistance to flowing

Answers

Answer 1

Answer:

Answer:

E. a fluid's resistance to flowing

Explanation:

Viscosity, also known as "thickness" is a rheological property that describes a fluid's resistance to flowing, fluids of low viscosity, like water, flow more easily while high viscosity fluids, like mud, are harder to move through. It is an important property because it determines the energy required to make a certain fluid flow.

Answer 2

Answer: D. the density of a fluid

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Once their strength is exceeded, rocks near the surface behave likeA. modeling clay. B. most metals. C. glass objects. D. caramel candy.

Explain what is meant by “field” and compare the properties of gravitational, electric, and magnetic forces in terms of particles affected, factors affecting the magnitude, and their relative strengths.

Answers

Field in this context refers to a region of the space to which corresponds a value.

There is a gravitational field around the earth, because a mass m placed at any point around the earth will be atracted (gravitational force) by it.

There is an electric field in a point when a charge placed there feels an electric force.

The gravitational field is proportional to the value of the mass of the object that produces it.

The electric field is proportional to the magnitude of the charge of the particle that produces it.

The gravitational field is always attractive. The electric field may be attractive or repulsive.

Both fields are proportional to the inverse of the squared distance.

The magnetic field is created when a charge is in movement,i.e a charge in movement will create a magnetid fiedl around it that will act and create a magnetic force over other charge also in movement.

The magnetic field is proportional to the product of the charge times its velocity and inversely proportional to the squared distance. The force generated my be attractive or repulsive.

Wood is an example of a fossil fuel.User: The type of energy stored by fossil fuels such as coal is
a. kinetic energy.
b. mechanical energy.
c. chemical potential energy.
d. electromagnetic energy.
User: An example of a fossil fuel is
a. wood.
b. petroleum.
c. the sun.
d. water.

Answers

a.kinetic energy for it an example of wood.

Answer:

Explanation:

What branch of physics best explains the photoelectric effect?A.) nature of light
B.) general relativity
C.) law of conservation of momentum
D.) thermodynamics

Answers

i think its nature of light

What the unit for electric current

Answers

The unit of electric current is the Ampere.

1 Ampere of current means that if you set up your chair and
stare at the electrons flowing past one point in the circuit, you'll
see 1 coulomb of charge passing that point every second.

How will you recognize 1 coulomb of charge ?
Well, every electron carries the same amount of charge, and
we know how much that is. (Read about the Millikan oil-drop
experiment in 1909.) So we know how many electrons it takes
to carry 1 coulomb of charge past the point you're watching.

All you have to do is count the electrons as they zip past.
Every time you count 6,241,509,343,000,000,000 electrons,
you can tick off 1 coulomb of total charge that they're carrying.
If you reach that count every second, you know the current
passing that point is 1 Ampere.

Answer: amps

Explanation:

Classical physics is a good approximation to modern physics under certain circumstances. What are they?

Answers

Answer and Explanation:

In classical physics we study about macroscopic objects and in modern physics we study about microscopic objects but under some circumstances classical physics is a approximation to modern physics such as

The object must be microscopic but they should be large enough so that we can see that through a microscope
The speed of the object should be very less it should be about 1 % of the speed of the light
They should be involved with very week gravitational field

Answer:

Classical physics is a good approximation to modern physics under these certain circumstances: Matter must be moving at speeds less than about 1% of the speed of light, the objects dealt with must be large enough to be seen with a microscope, and only weak gravitational fields, such as the field generated by the Earth, can be involved.

Explanation:

The large blade of a helicopter is rotating in a horizontal circle. The length of the blade is 6.58 m, measured from its tip to the center of the circle. Find the ratio of the centripetal acceleration at the end of the blade to that which exists at a point located 4.78 m from the center of the circle.

Answers

Answer:1.37

Explanation:

Given

Length of Blade $L=6.58 m$

Let blades be rotating at an angular velocity of $\omega$

centripetal acceleration at any radial distance r is given by

$a_c=\omega ^2\cdot r$

at $r=6.58$

$a_c_1=\omega ^2\cdot 6.58$

at $r=4.78 m$

$a_c_2=\omega ^2\cdot 4.78$

thus $(a_c_2)/(a_c_1)=(\omega ^2\cdot 4.78)/(\omega ^2\cdot 6.58)$

$(a_c_2)/(a_c_1)=0.72$

$(a_c_1)/(a_c_2)=1.37$

Final answer:

Centripetal acceleration depends inversely on the radius. The ratio of the centripetal accelerations at the end of the blade and at 4.78m from the center is approximately 0.73.

Explanation:

The centripetal acceleration of an object moving in a circle of radius r is given by the formula ac = v²/r, where v is the tangential velocity of the object. In this scenario, the velocity at both points on the blade is the same, as the blade is rotating as a whole.

Therefore, the centripetal acceleration on the blade at any point is inversely proportional to the radius from the center of the circle to that point.

So, the ratio of the centripetal acceleration at the end of the blade (6.58 m from the center) to the centripetal acceleration at a point located 4.78 m from the center, is the inverse ratio of their distances from the center. Therefore, the ratio is 4.78/6.58 which approximately equals 0.73.