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Mars2501 [29]
3 years ago
8

Choose the option that best suit the question .

Physics
1 answer:
Igoryamba3 years ago
7 0

Answer:

(b) 1/sinƟ

Explanation:

A simple machine can be defined as a type of machine with no moving parts but can be used to perform work.

Basically, a simple machine allows for the transformation of energy into work. The six simple machines are; lever, wedge, pulley, screw, wheel and axle, and inclined plane.

Inclined plane is a simple machine set at an angle and then used to lift an object.

In Physics, the velocity ratio of a simple machine is calculated as a ratio of the distance moved by the effort to the vertical distance through which a load is raised.

Mathematically, the velocity ratio of an inclined plane of angle Ɵ, acting as a simple machine is given by the formula;

Velocity ratio (V.R) = 1/sinƟ

Basically, an increase in the angle of inclination (measured in degrees) of an inclined plane increases its velocity ratio.

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To solve this problem we can apply the concept related to thermal expansion, including the analogy with resistance and final intensity.

The mathematical expression that describes the expansion of a material by a thermal process is given by

R = R_0\alpha \Delta T

Where

R_0= Initial resistance

\alpha = Thermal expansion coefficient

\Delta T = Change in the temperature

If we want to directly obtain the final value of the resistance of the object, you would simply add the initial resistance to this equation - because at this moment we have the result of how much resistance changed, but not of its final resistance - So,

R_f = R_0 + L_0\alpha \Delta T

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Re-arrange to find the change at the temperature,

\Delta T=\frac{1}{\alpha}\frac{R_f}{R_0}-1}

Since the resistance is inversely proportional to the current and considering that the voltage is constant then

R \propto \frac{1}{I}

Then,

\Delta T=\frac{1}{\alpha}\frac{I_0}{I_f}-1}

\Delta T = \frac{1}{4.5*10^{-3}}(\frac{I_0}{I_0/8}-1)

\Delta T = \frac{1}{4.5*10^{-3}}(8-1)

\Delta T = 1555.5k

<em>(It is possible that there is a typing error and the value is not 4.5 but 4.3, so the closest approximate result would be 1627K and mark this as the correct answer)</em>

6 0
3 years ago
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