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2 years ago

Select all that apply. The force that opposes the start of motion is referred to as _____.

2 answers:

8 0

The correct answers are <span>starting friction and </span>static friction

Friction slows down all forces, but starting friction slows down or stops completely the start of motion.

emmainna [20.7K]2 years ago

6 0

Answer: Option (c) is the correct answer.

Explanation:

A force helps to keep an object at rest is known as static friction. This type of friction avoids the movement of object from its initial place unless and until a larger force than the friction force is applied on the object.

Whereas sliding friction is the friction that is experienced when object is sliding. On the other hand, kinetic friction is the friction experienced when an object is moving from it initial place.

Thus, we can conclude that out of the given options the force that opposes the start of motion is referred to as static friction.

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gizmo_the_mogwai [7]

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2 years ago

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An aeroplane flew at 600mph for 7 hours. How far did it travel?

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Answer:

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2 years ago

~choices below~

mart [117]

A is the correct answer

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3 years ago

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An object of irregular shape has a characteristic length of L = 0.5 m and is maintained at a uniform surface temperature of Ts =

goblinko [34]

Answer:

The value of the average convection coefficient is 20 W/Km².

Explanation:

Given that,

For first object,

Characteristic length = 0.5 m

Surface temperature = 400 K

Atmospheric temperature = 300 K

Velocity = 25 m/s

Air velocity = 5 m/s

Characteristic length of second object = 2.5 m

We have same shape and density of both objects so the reynold number will be same,

We need to calculate the value of the average convection coefficient

Using formula of reynold number for both objects

$R_{1}=R_{2}$

$\dfrac{u_{1}L_{1}}{\eta_{1}}=\dfrac{u_{2}L_{2}}{\eta_{2}}$

$\dfrac{h_{1}L_{1}}{k_{1}}=\dfrac{h_{2}L_{2}}{k_{2}}$

Here, $k_{1}=k_{2}$

$h_{2}=h_{1}\times\dfrac{L_{1}}{L_{2}}$

$h_{2}=\dfrac{q}{T_{2}-T_{1}}\times\dfrac{L_{1}}{L_{2}}$

Put the value into the formula

$h_{2}=\dfrac{10000}{400-300}\times\dfrac{0.5}{2.5}$

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Hence, The value of the average convection coefficient is 20 W/Km².

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3 years ago