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3 years ago

7

What is a conservation law? What is the basic approach taken when using a conservation law?

1 answer:

Burka [1]3 years ago

4 0

A conservation law is law on a certain measurable property that is said to not change as the system undergo changes over a certain time. These laws include, conservation of mass, energy and momentum. The basic approach for these laws is to make balances and make sure the flow in is equal to what is going out the system.<span />

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What is the process used to separate the mixture of flour and rice?

Veseljchak [2.6K]

1. Take a breaker
2. Put a sieve on it
3. Pour the mixture and shake the sieve gently
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3 years ago

A uniform solid ball with a mass , M, is placed at the top of an inclined plane and released. What will be the velocity of the b

eimsori [14]

Answer: $v=\sqrt{\frac{10}{7}\cdot gH}$

Explanation:

Given

Mass of ball is M

Height of incline is H

Here conservation of energy will provide the velocity at bottom

Energy at top of incline plane $=MgH$

Energy at bottom=Kinetic energy+Rotational energy

Assuming Pure rolling we can write

$v=\omega R$

where $v$ =velocity of ball

$\omega$ =angular velocity of ball

R=radius of ball

$E_b=\frac{1}{2}Mv^2+\frac{1}{2}I\omega ^2$

where I=moment of inertia of ball

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$E_b=\frac{1}{2}Mv^2+\frac{1}{2}\times \frac{2}{5}MR^2\times (\frac{V}{R})^2$

$E_b=\frac{7}{10}Mv^2$

Now ,

$MgH=\frac{7}{10}Mv^2$

$v=\sqrt{\frac{10}{7}\cdot gH}$

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3 years ago

What are the standard units of length, mass, and volume in the<br> metric system?

antoniya [11.8K]

Answer:

Meter, Gram and Liter.

Explanation:

In the metric system, the standard units for the below are;

Length - Meter

Mass - Gram

Volume - Liter.

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3 years ago

At a given instant, the force on an electron is in the +z-direction (out of the page), which the electron is moving in the +x-di

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Answer:

The direction of the B-field is in the +y-direction.

Explanation:

The corresponding formula is

$F_B = qv\times B$

This means, we should use right-hand rule.

Our index finger is pointed towards +x-direction (direction of velocity),

our middle finger should point towards the direction of the B-field,

and our thumb should point towards the +z-direction (direction of the force).

Since our middle finger in this situation points towards +y-direction, the B-field should be in +y-direction.

$\^{x} \times \^{y} = \^{z}$

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