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denis-greek [22]
3 years ago
9

1- what is a machine?

Physics
1 answer:
aleksklad [387]3 years ago
3 0
1) A machine is an apparatus using or applying mechanical power and having several parts, each with a specific function.

2) Energy is the capacity of a physical system to do work.

3) Fuels are any material that can be made to react with other substances so that it releases energy as heat energy or to be used for work.

4) Measure a volume of an acid and place into a polystyrene cup which is placed into a beaker.
Measure the temperature of the acid with a thermometer.
Add a measured volume of an alkali to the acid.
Measure the temperature rise to calculate the energy change.

5) the ratio of the useful work performed by a machine or in a process to the total energy expended or heat taken in; an action designed to achieve efficiency.

6) Pulley, lever, screw, and inclined plane.

Have a wonderful day ✨❤️
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A ball hits a wall horizontally at 6m/s and rebounces at 4.4m/s the ball is in contact with wall for 0.04 sec. what is the accel
Svetlanka [38]

Answer:

Acceleration (a) = 40 m/s²

Explanation:

Given:

Initial velocity (u) = 6 m/s

Final velocity (v) = 4.4 m/s

Time taken (t) = 0.04sec

Find:

Acceleration (a) = ?

Computation:

We know that,

⇒ v = u + at

⇒ a = (v - u) / t

⇒ Acceleration (a) = (4.4 - 6) / 0.04

⇒ Acceleration (a) = (-1.6) / 0.04

Acceleration (a) = 40 m/s²

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3 years ago
Suppose that you are taking a course in geometry. You are trying to determine whether two geometric shapes are identical, so you
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Explanation:

Yes, in order to determine whether two geometric figures are identical or not we tend to rotate one of the figure clockwise or anti clock wise mentally. However, in clockwise rotation larger the angel more will be the time taken for instance, it will take longer to rotate 120° than to rotate 40°. Whereas in anti clockwise ration it will be vice versa.

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If you add two velocity vectors going in opposite directions, will the resultant vector be smaller or larger than the vectors yo
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smaller, because the part of the velocities cancel each other out

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Group 2 and Group 3 stars represent which stages of development? Describe these groups in terms of their relative age, size, bri
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Answer:

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because i just took it and got it correct.

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3 years ago
Bruce pulls a spring with a spring constant k=100 Nmk=100\, \dfrac{\text N}{\text m}k=100mN​k, equals, 100, start fraction, star
emmainna [20.7K]

Answer:

K_{e} = 2.0 J

Explanation:

In this exercise you are asked to calculate the elastic potential energy of a spring

          K_{e} = ½ k x²

where k is the spring constant and x is the displacement from equilibrium position

In this exercise, indicate that the spring constant is k = 100 N/m, the length at rest is  x₀ = 20 cm = 0.20 m, up to the position x₁ = 40 cm = 0.40 m, therefore the elongation

           Δx = x₁ - x₀

           Δx = 0.40 - 0.20

           Δx = 0.20 m

let's calculate the elastic potential energy

           K_{e} = ½ 100 0.20²

           K_{e} = 2.0 J

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3 years ago
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