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Umnica [9.8K]
3 years ago
7

Surface tension _____.

Physics
1 answer:
Trava [24]3 years ago
5 0

Answer : The correct option is, (D) Surface tension is caused by cohesion between water molecules on the surface.

Explanation :

Surface tension : It is caused by the cohesion between water molecules on the surface or we can say that it is a tension of the surface of liquid caused by the attraction of the particles which are present on the surface layer by the bulk of the liquid, which tends to minimize surface area.

And due to the surface tension phenomena the shape of the water molecule tend to assume a spherical shape to attain the minimum surface area.

Hence. the correct option is, (D) Surface tension is caused by cohesion between water molecules on the surface.

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A 3047.8 kg truck has lost its brakes coming down a mountain. Fortunately, there is a ramp of thick gravel inclined at 9.5 degre
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Answer:

The work done by the gravel to stop the truck is 520.44 kJ

Explanation:

<u>Step 1</u>: Data given

Mass of the truck = 3047.8 kg

The ramp has an angle of 9.5 °

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distance = 26.6 meters

<u>Step 2:</u> Calculate initial kinetic energy

sin 9.5° = 0.165

h = ℓ*sin 9.5° = 26.6*0.165= 4.39 m

Ek = 1/2m*Vo² = 1/2*3047.8*20.68² = 651714.7 Joule = 651.7 kJ  = initial kinetic energy

<u>Step 3: </u>Calculate potential energy

Epot = U = m*g*h = 3047.8*9.81*4.39 = 131256.25 Joule = 131.26 kJ

<u>Step 4:</u>  What work is done by the truck on the gravel?  

Frictional energy Ef = 651.7 kJ - 131.26 kJ = 520.44 kJ

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3 years ago
The free-fall acceleration on Mars is 3.7 m/s^2. What length of pendulum has a period of 1.0 s on Earth? What length of pendulum
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Answer:

Explanation:

Given

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Time Period of pendulum on earth T=1\ s

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L=\frac{9.8}{(2\pi )^2}

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L'=\frac{g_m}{(2\pi )^2}

L'=\frac{3.7}{39.48}

L'=0.0936\ m

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the movement of electrons in one direction is called direct current. The electrons move in a direct, single path without changing directions.
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The answer to this question is false
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