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2 years ago

(FLUID MECHANICS)

Physics

1 answer:

Vera_Pavlovna [14]2 years ago

3 0

Answer:

option B

Explanation:

When a body is immersed in liquid there will be two force is acting on the body.

First one force acting downward due to weight of the body.

And the second force acting on the object will be buoyant force.

If the object is not in equilibrium the apparent weight will be equal to net force acting on the object.

$F_{net} = W - F_b$

W is the weight of the object acting downward

Fb is the buoyancy force acting upward on the object.

Hence, the correct answer is option B

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A steel wire, 3.2 m long, has a diameter of 1.2 mm. The wire stretches 1.6 mm when it bears a load. Young's modulus for steel is

Troyanec [42]

Answer:

The mass, m, of the load = 11.3 Kg

Explanation:

Young's Modulus = Stress / Strain

Stress = Force / Area

Force = mass,m * acceleration due to gravity,g

assuming g = 10ms⁻²

therefore, Force = 10m

m is mass of the load in kilograms

Area of steel wire = π * r^2, where π= 3.14, r = 1.2/2 = 0.6mm or 6.0 * 10^-4m

= 3.14 * (6.0 * 10⁻⁴m)^2 = 1.13*10⁻⁶m²

Stress = 10m / 1.13*10⁻⁶m²

Strain = extension / original length

= (new length - original length)/original length

= (3.2016 - 3.2000)/3.2000

Strain = 0.0005

Using Young's Modulus = Stress / Strain

Note: 1Pa = 1N/m² ; Young's modulus for steel is 2.0 × 10¹¹ Pa or N/m²

2.0*10¹¹ N/m²= Stress / Strain

2.0*10¹¹ = (10m / 1.13*10⁻⁶) / 0.0005

0.0005 * 2.0*10¹¹ = 10m/1.13*10⁻⁶

10m = 1.13*10⁻⁶ * 0.0005*2*10¹¹

10m = 113

m = 11.3 kg

Therefore, the mass, m, of the load = 11.3 Kg

8 0

2 years ago

Do you think scientists will ever be able to recreate a living creature from the distant past successfully?

lilavasa [31]

Are we talking about extinct?

I think it could be possible. However, the creature may not last long. Creatures from the distant past died off for a reason, they couldn't survive. So, with the sudden change in environment, they won't last long, especially if they didn't last in the past.

3 0

2 years ago

Read 2 more answers

How do different lense types connect to helping locate sharks through mechanical radio waves?

Gnom [1K]

Answer:

I am not quite sure, but maybe you can find something from these websites

The second one to me is the best. Sorry if it wasn't what you needed. :(

Explanation:

https://phys.org/news/2012-11-metamaterial-lens-focuses-radio-device.html

https://animals.howstuffworks.com/fish/sharks/shark-yummy-hum1.htm

5 0

2 years ago

Temperature is a measure of

Neko [114]

Answer:

degree celsius

Explanation:

it's measured in degree Celsius

6 0

2 years ago

By how much does the earth-Sun distance change? 300,000 miles 500,000 miles 3,000,000 miles 3,500 miles

iogann1982 [59]

Answer:

3,000,000 miles

Explanation:

The Earth's perihelion distance is about 147,000,000 kilometers and its aphelion distance is about 152,000,000 kilometers. So, the change in distance is about 5,000,000 kilometers which translates to about 3,000,000 in Miles.

4 0

2 years ago