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1 year ago

7. An Archimedean screw is a screw within a closely fitting cover, so that water can be raised when the

Physics

1 answer:

mylen [45]1 year ago

5 0

The height through which the water is lifted is 196.25 m.

<h3>What is mechanical advantage?</h3>

Mechanical advantage is a measure of the force amplification achieved by using a tool, mechanical device or machine system.

Mechanical advantage is also defined as the ratio of output force to input force in a system.

Mechanical Advantage = Output force / input force

12.5 = output force / 15.7

output force = 15.7 x 12.5

output force = 196.25 m

Thus, the height through which the water is lifted is 196.25 m.

Learn more about mechanical advantage here: brainly.com/question/25984831

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A glass tube in the shape of a letter J has the shorter limb sealed and the longer limb open. Mercury is poured into the tube un

Ronch [10]

Answer:

35.4 cm

Explanation:

We have that when the level of mercury on either limb is the same, the pressure of the trapped air, P₁ = Atmospheric pressure

Also the initial height of the mercury in the tube = The reading of the barometer = 75.0 cm

The initial length of the air column, l₁ = 6.3 cm

The final length of the air column, l₂ = 4.2 cm (The length is expected to decrease due to compression)

The volume, V = l × A

Where;

A = The cross sectional area of the tube

Therefore, the volume of the air column is directly proportional to the length of the air column

∴ V ∝ l

According to Boyles law, we have;

P₁·V₁ = P₂·V₂

Where;

P₁ = The initial pressure in the air column before more mercury is added

V₁ = The initial volume occupied by the air in the air column

P₂, and V₂ are the final pressure and volume of the air column respectively

Given that V = l·A, we can write;

P₁·l₁·A = P₂·l₂·A

P₂ = P₁·l₁·A/(l₂·A) = P₁·l₁/(l₂) = P₁ × 6.3/4.2 = 1.5·P₁

The pressure in the air column after more mercury is added, P₂ = 1.5 × P₁

P₁ = Atmospheric pressure, therefore;

The pressure in the air column after more mercury is added, P₂ = 1.5 × Atmospheric pressure

Pressure = h·ρ·g

Where;

ρ = The density of the substance

g = The acceleration due to gravity

h = The height of the column of the fluid

Given that the density and the gravitational force, can be taken as constant, we have that the pressure of the fluid is directly proportional to the height of the fluid column

Therefore, when the pressure doubles, the height of the fluid column doubles, and when the factor of increase is 1.5, we have;

The final level of the mercury, h₂ = 1.5·h₁ = 1.5×75 cm = 112.5 cm

The initial length of the closed end of the J tube, $h_{closed1}$ = 6.3 cm + 75 cm = 81.3 cm

The final length of the mercury in the closed end, $h_{closed2}$ = 81.3 cm - 4.2 cm = 77.1 cm

The difference in the level of mercury, Δh = h₂ - $h_{closed2}$

∴ Δh = 112.5 cm - 77.1 cm = 35.4 cm

The difference in the levels of mercury in the limbs, Δh = 35.4 cm

5 0

3 years ago

If a biker rides west for 50 miles from his starting position, then turns and bikes back east for 80 miles. What is his displace

lara [203]

Answer:

Displacement = 30 miles due east.

Explanation:

Let the distance due west be A

Let the distance due east be B

Given the following data;

A = 50 miles

B = 80 miles

To find the displacement;

Displacement can be defined as the change in the position of a body or an object. It is a vector quantity because it has both magnitude and direction.

Thus, the displacement would be calculated by subtracting distance A from distance B because the rider rode in opposite directions.

Displacement = B - A

Displacement = 80 - 50

Displacement = 30 miles due east.

7 0

3 years ago

You are flying your personal rocketcraft at 0.9c from Star A toward Star B. The distance between the stars, in the stars' refere

Alexxx [7]

Answer:

See explanation.

Explanation:

If both stars explode in simultaneously in the your frame of reference then obviously you will see the two flashes simultaneously, and therefore, the time difference between the events would be zero.

If however, the stars exploded simultaneously in their frame of reference, then you would not observe the flashes simultaneously. Then the time difference between the events will not be zero, rather, you will observe star B exploding first and star A after.

7 0

3 years ago

Which of the following statements about flux are true?

vekshin1

All of these statements about flux are true, except for the last one - When turning a surface inside of an electric field, the maximum flux is achieved if the electric field vector and the surface vector are perpendicular.
These vectors don't have to be perpendicular, which is why this statement is incorrect, whereas the rest of them are true.

8 0

3 years ago

What is the electric potential energy of a charge that experiences a force of 3.6x10^-4 N when it is 9.8x10^-5 m from the source

jekas [21]

Answer:

3.5 x 10^-8 J

Explanation:

We are given,

force experienced by a charge = 3.6 x 10^-4 N; and

distance of charge from the source of electric field = 9.8 x 10^-5 m

We know that, Energy = force x distance

therefore, to find the potential energy of the charge, we need to multiply its applied force with the given distance to get:

Electric potential energy of a charge = (3.6 x 10^-4) × (9.8 x 10^-5) = 3.5 x 10^-8 J

Therefore, the potential energy of a charge is 3.5 x 10^-8 J.

6 0

4 years ago