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klasskru [66]
3 years ago
10

A piston above a liquid in a closed container has an area of 1m2. The piston carries a load of 350 kg. What will be the external

pressure on the upper surface of the liquid?
A. 27.3 kPa
B. 3.43 kPa
C. 4.90 kPa
D. 68.6 kPa
Physics
1 answer:
RoseWind [281]3 years ago
6 0
<h3><u>Answer;</u></h3>

B. 3.43 kPa

<h3><u>Explanation</u>;</h3>

Pressure is given by the formula;

Pressure = Force / Area

Force is the product of mass and acceleration due to gravity. 

 Thus;  Force = mass x acceleration due to gravity

Substituting;

               Force = (350 kg) x (9.8 m/s²)

               Force = 3430 N

Then, using the first equation;

                Pressure = 3430 N / 1m² or Pa

<h3>                             <u>= 3.43 kPa</u></h3>

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Answer:

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   Displacement = 77 m, Initial velocity = 28 cos 15 = 27.05 m/s, acceleration = 0

Substituting

   77= 27.05t+\frac{1}{2} *0*t^2\\ \\ t=77/27.05=2.85 seconds

So she will cover 77 m in 2.85 seconds

 Now considering vertical motion, up direction as positive

    Initial velocity = 28 sin 15 = 7.25 m/s, acceleration =acceleration due to gravity = -9.8 m/s^2, time = 2.85

    Substituting

           s=7.25*2.85-\frac{1}{2}*9.8*2.85^2=20.69-39.80 =-10.11 m

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2 years ago
A monochromatic light passes through a narrow slit and forms a diffraction pattern on a screen behind the slit. As the wavelengt
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Answer:

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Explanation:

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We represent these distances as two sides of the triangle, and the distance between the planes as the side opposing the angle 58.6.

Using the law of cosine, r^2 representing the distance between the planes, we see that:

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<h3>What is period of oscillation?</h3>

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