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Irina18 [472]
3 years ago
15

Based on the law of conservation of energy, how can we reasonably improve a machine’s ability to do work? Move the machine to a

different gravitational field. Increase the friction between its moving parts. Reduce the friction between its moving parts. Redefine the machine’s system boundaries.
Physics
2 answers:
Lady bird [3.3K]3 years ago
7 0
Reduce the friction. Since the total energy is conserved, the only way to improve its work capacity is by reducing energy that doesnt go into work.
Ulleksa [173]3 years ago
4 0

Reduce the friction between its moving parts

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45*3*2=20kg in total
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How do you appreciate sweating mechanism of human body to control the temperature of the body?​
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Explanation:

When the body temperature tends to rise, such as during physical exercise, the body begins to sweat. The sweat with high water content is secreted in the skin and when it evaporates into the environment, it cools the body. This is due to the property of water having high heat capacity. It carries with it a lot of heat per molecule (because water requires much energy – than most materials - for its temperature to rise by a degree) hence ideal for cooling. This is why on a hot day, sweating makes the skin feel cooler than the surrounding.

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3 years ago
Two long, parallel wires carry currents of different magnitudes. If the amount of current in one of the wires is doubled, what h
Ulleksa [173]

Answer:

The magnitude of the force that each wire exerts on the other will increase by a factor of two.

Explanation:

force on parallel current carrying wire, F = BILsinθ

where;

B is the strength of the magnetic field

L is the length of the wire

I is the magnitude of current on the wire

θ is the angle of inclination of the wire

Assuming B, L and θ is constant, then F ∝ I

F = kI

\frac{F_1}{I_1} = \frac{F_2}{I_2}

When the amount of current is doubled in one of the wires, lets say the second wire;

\frac{F_1}{I_1} = \frac{F_2}{2I_1} \\\\F_2 = \frac{2F_1I_1}{I_1} \\\\F_2 =2F_1

Also, if will double the amount of current on the first wire, then

F₁ = 2F₂

Therefore, the magnitude of the force that each wire exerts on the other will increase by a factor of two.

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3 years ago
The abbreviation for the SI unit of temperature is _____. <br> m <br> s <br> kg <br> K
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In short, Your Answer would be Option D

Hope this helps!
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aev [14]

Answer: 2              1                  3  

is your answer

Explanation:

your'e welcome

4 0
3 years ago
Read 2 more answers
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