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3 years ago

Which statement accurately describes surface tension?

Physics

2 answers:

lawyer [7]3 years ago

5 0

Answer:

A. Attractive forces between molecules at the surface cause a liquid to resist spreading out.

Explanation:

Surface tension can be defined as a property of liquid which makes its surface to resist an external force, as a result of the cohesive nature of its molecules.

This ultimately implies that, the surface tension of a liquid is mainly caused by the cohesive forces existing between its molecules.

Hence, the statement which accurately describes surface tension is that, the attractive forces between molecules at the surface cause a liquid to resist spreading out. Also, the attractive force is due to electrostatic forces and it reduces the surface area of a liquid.

Mathematically, surface tension is given by the formula;

Surface tension = surface force)/length the force acts

γ = F /d

Where;

Γ is the Surface tension.

F is the force which applies to the liquid.

d is the length where the force acts

Dahasolnce [82]3 years ago

5 0

Answer:

Explanation:

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A steel cable lying flat on the floor drags a 20 kg block across a horizontal, frictionless floor. A 110 N force applied to the

sammy [17]

Answer:

The mass of the cable is 4.94 kg

Explanation:

It is given that,

Mass of the block, m = 20 kg

Force applied to the cable, F = 110 N

Speed of the block, v = 4.2 m/s

Distance, d = 2 m

Let a is the acceleration of the block. It can be calculated using the third equation of motion as :

$v^2-u^2=2ad$

$(4.2)^2-(0)^2=2a\times 2$

$a=4.41\ m/s^2$

Let m' is the mass of the cable. It can be calculated using the second law of motion as :

$m'=\dfrac{F}{a}-m$

$m=\dfrac{110\ N}{4.41\ m/s^2}-20$

m = 4.94 kg

So, the mass of the cable is 4.94 kg. Hence, this is the required solution.

5 0

3 years ago

SOMEONE PLEASEEEEEEEEEEEEEEEEEEEE HELPPPPPPPPPPPPPPP

Evgen [1.6K]

Answer:

53.33 seconds

Explanation:

From the question;

Power of the motor is 75 kW or 75000 W
Depth or height is 150 m
Volume of water is 400 m³

We are required to determine taken to raise the water from the given height.

We know that density of water is 1000 kg/m³

Therefore;

Mass of water = 400 m³ × 1000 kg/m³

= 4.0 × 10^5 kg

Thus, force required to raise the water;

= 4.0 × 10^5 kg × 10 N/kg

= 4.0 × 10^6 N

To determine the time;

we use the formula;

Time = work done ÷ power

= (4.0 × 10^6 N × 150 m) ÷ 75000 Joules/s

= 53.33 seconds

Therefore, time taken to raise the water is 53.33 seconds

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3 years ago

Explain how does the geyser works?

Shkiper50 [21]

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3 years ago

What do you neEnter the word that best completes the sentence.

Morgarella [4.7K]

I think it would be eager

5 0

3 years ago

two forces 3N and 4N act on a body in a direction due north and due East respectively calculate their equivalent

Lostsunrise [7]

Two forces 3N and 4N act on a body in a direction due north From East, the equilibrant's angle is given by $\theta=\tan ^{-1} \frac{3}{4}=36.8^{\circ}$ .

<h3>What are equilibrium and resultant force?</h3>

The equilibrium force is the balanced force when the net force acting is zero and is the exact opposite of the consequent force. The resultant force is one single force replaced by numerous forces.

<h3>Briefing:</h3>

3N and 4N are the two forces pulling on a body.

The forces work along the North and the East, which are perpendicular to one another.

The resultant of the forces, which is provided by the equilibrant force,

R = √(3)²+(4)²

R = 5N

From East, the equilibrant's angle is given by

$\theta=\tan ^{-1} \frac{3}{4}=36.8^{\circ}$

To know more about equilibrium force visit:

brainly.com/question/12582625

#SPJ9

6 0

1 year ago