When a machine is used to perform a task, work output is always more than work input. please select the best answer from the choices provided t f?

Answers

Answer 1
Answer: properly input current above 40 voltage or 100 for example elecrical fan machine is used to perform a task, work output is always more than work

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Determine the change in velocity of a car that starts at rest and has a final velocity of 20m/s north

Answers

The change in velocity of a car that starts at rest and has a final velocity of 20 meters/second north would be 20 meters/second.

What is acceleration?

The rate of change of the velocity with respect to time is known as the acceleration of the object. Generally, the unit of acceleration is considered as meter/seconds².

As given in the problem we have to find the  change in velocity of a car that starts at rest and has a final velocity of 20m/s north,

the final velocity of the car = 20 meters/second north

Change in the velocity = final velocity - initial velocity

                                      =20 - 0

                                      = 20 meter/second

Thus, the change in the velocity would be 20 meters/second

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Im not too sure if I just dont understand but if something starts at rest, its not moving so Vi would be 0m/s and if the final velocity would be 20m/s North. Than the change would be 20m/s, its not asking for displacment so you don't need direction. I got my answer from doing Change in Velocity = Final velocity - Initial velocity

What are two ways in which all types of precipitation are alike

Answers

The two ways in which all types of precipitation are alike they all come from the clouds,they are all formed by precipitation.

What is precipitation ?

Any liquid or frozen water that condenses in the atmosphere and falls to the ground is known as precipitation. Rain, sleet, and snow are only a few of its various manifestations. Precipitation is one of the three main processes that make up the global water cycle, together with evaporation and condensation.

Rain, sleet, and snow are only a few of its various manifestations. Precipitation is one of the three main processes that make up the global water cycle, together with evaporation and condensation. Water vapour in the clouds condenses into increasing-sized droplets of water, forming precipitation.

The most common forms of precipitation that come from cloud-borne particles are rain, snow, freezing rain, and sleet. The changes in temperature are the primary distinction between these various types of precipitation.

Thus, The two ways in which all types of precipitation are alike they all come from the clouds,they are all formed by precipitation.

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1. they all come from the clouds 2.they are  all formed by precipatation.                       hope this helps enjoyyyyyy!!!!!!!!!!!!!

A solid aluminum cube has sides each of length L . A second cube of the same material has sides four times the length of the first cube; i.e., 4 L . Compared to the first cube, the total surface area of the second cube is 1. twenty-seven times the first cube. 2. sixteen times the first cube. 3. sixty-four times the first cube. 4. eight times the first cube. 5. twenty-four times the first cube. 6. two times the first cube

Answers

Answer:

Option (2): Sixteen times the first cube

Explanation:

Surface \:  Area \:  of  \: Cube = 6 {a}^(2)

(T.S.A \: of \: larger \: cube)/(T.S.A \: of \: smaller \: cube)  =  \frac{6 * 16 {l}^(2) }{6 *  {l}^(2) }  = 16

When the linear dimensions of a solid are multiplied by ' R ', the surface area of all or any part of it increases by R² , and the volume of all or any part of it increases by R³ .

If the sides of the second cube are 4 times the sides of the first one, then the second cube has (4²) = sixteen times the surface area of the first one (2), and it has (4³) = 64 times the volume of the first one.

Which terrestrial planet experiences the shortest year?A. Mars
B. Earth
C. Venus
D. Mercury

Answers


Being the planet closest to the sun, Mercury must be the one
with the shortest year.  That's how gravity works.

Is energy conserved when a ball falls to the ground

Answers

Of course. You've certainly heard that energy is conserved, period. Why would you think it's different when a ball falls to the ground ? ?

A material that provides resistance to the flow of electric current is called a(n)

Answers

Th correct answer to this question would be, Insulator. Notice in the question it says "Material". The question is basically asking, What item resists the flow of and electric current. A resistor is a device that suppose to strain the electric  current. And resistance is the measure of how well the material can conduct an electric charge. With all of that being stated, Insulator materials include paper, dry wood, rubber, glass, ect. Insulator products provides resistance.

Make sure you read the questions very carefully.

Answer: Insulator

Explanation: Insulators stop electric currents from going through