What phase of matter is unable to transfer heat by convection

Answers

Answer 1

Answer: Convection is the actual physical motion of heated material rising and cool material sinking.
That's not possible in a solid ... solids don't flow.

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What is the definition of uniform motion?

Answers

Uniform motion means no part of the motion is changing.

The two parts of motion are . . . speed and direction.

If neither part is changing, that means constant speed in a straight line.

How does the magnetic force exerted by a magnet change as the distance between two magnets increases

Answers

As the distance between two magnets increases, the force between them decreases.

If the force increased along with distance, then the magnet in your hand would reach out
and grab every magnet in Australia or on Mars and pull it toward you.

What is the velocity of an upward moving 500kg elevator that has 4000 of energy

Answers

Answer:

4 m/s

Step-by-Step Explanation:

E = mgh and h = E/mg

So if you put your numbers in the formula : h = 4000J/500 * 10

you will get h = 4/5 meters

use this , If the elevator moves from top to the ground in a constasnt acceleration you will have all energy (4000 J) transformed into acceleration to speed up its motion.

(All potential energy will be turned into movement energy). As explained in this formula;

mgh = mv²/2 , solve out (v) from the equation

v = √2gh = √2·10·4/5 (digits are together- not related to the problem, just for clarification) = 4 m/s

Answer the velocity of the elevator is

4 m/s

Lead has a density of 11.3 g/cm3 and a mass of 282.5 g. What is its volume?

Answers

Well we know that density=mass divided by volume, so let's substitute :)

11.3=282.5/V

Now we know that 282.5 has to be divided by SOMETHING in order to get 11.3.

You can waste time trying every number under the sun, or you can use a little trick I learned in elementary school which is to divide 282.5 by 11.3. This works because it shows how many times 11.3 goes into 282.5 which is the volume of this "piece of" lead. Since 11.3 goes perfectly 25 times into 282.5, the Volume of this "piece of" lead is 25 cm³. :)

A source of voltage produces an electric current by _____.A. increasing resistance in the conducting wire

B. increasing the speed of electrons that are flowing

C. creating a potential difference so electrons can flow

Answers

The correct choice is

C. creating a potential difference so electrons can flow.

An electron moves from low potential to high potential. so it moves only when there is difference in potential between two locations. A source of voltage creates a potential difference for the electron to move. So the correct choice is C.

c.creating a potential difference so electrons can flow

What is the centripetal force that allows a car to move around a sharp curve in a roadway?

Answers

For a level curve, the centripetal force will be supplied by the friction force between the tires and roadway.

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View the image below and answer the question.The illustration above is an example of which of Newton's Laws?aUniversal Law of GravitationbNewton's Second LawcNewton's First LawdNewton's Third Law

a 42.3 kg girl and a 7.93 kg sled are on the surface of a frozen lake, 15.0m apart and linked by a rope, but not moving yet. then the girl pulls on the rope, exerting a 5.76 N force on the sled, pulling it toward her. how far from the girl's original position do they meet?

Deimos completes one (circular) orbit of Mars in 1.26 days. The distance from Mars to Deimos is 2.35×107m. What is the centripetal acceleration of Deimos?