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Greeley [361]
3 years ago
8

If a certain mass of mercury has a volume of 0.002 m^3 at a temperature of 20°c, what will be the volume at 50°c

Physics
2 answers:
V125BC [204]3 years ago
5 0
Change in volume = mass x coefficient of linear expansion x change in temperature
.002 x .0001802 x 30 = .000010812

initial volume + change in volume = Final volume
.002 + .000010812 = .002010812 m cubed
eimsori [14]3 years ago
5 0
<h3><u>Answer;</u></h3>

<em><u>= 0.0020108 m³</u></em>

<h3><u>Explanation;</u></h3>
  • Using the concept on thermal expansion of matter, in this case thermal expansion of liquid mercury.

  V₁=0.002 m³, T₂ =20 °C

   V₂= ?   T₂ = 50° C

  • Thus, change in temperature will be; T₂ - T₁

That is, 50°C - 20°C = 30 °C

  • The coefficient (γ) of volume expansion of Mercury at 20 °C is 0.00018 per centigrade.
  • Therefore, the volume of mercury at 50° C will be given by;

       V₂ =V₁ [1 + γ(50-30)]

              =  0.002 [1 + 0.00018(30)]

              = 0.0020108 m³

Therefore; the volume of mercury at 50°C is  0.0020108 m³

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A speaker vibrates at a frequency of 200 hz what is its period
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You drop a pencil from your desk, which is 1 meter above the floor. How long does it take for the pencil to hit the floor? How f
vova2212 [387]

Answer:

1. 0.45 s.

2. 4.41 m/s

Explanation:

From the question given above, the following data were obtained:

Height (h) = 1 m

Time (t) =?

Velocity (v) =?

1. Determination of the time taken for the pencil to hit the floor.

Height (h) = 1 m

Acceleration due to gravity (g) = 9.8 m/s²

Time (t) =?

h = ½gt²

1 = ½ × 9.8 × t²

1 = 4.9 × t²

Divide both side by 4.8

t² = 1/4.9

Take the square root of both side

t = √(1/4.9)

t = 0.45 s.

Thus, it will take 0.45 s for the pencil to hit the floor.

2. Determination of the velocity with which the pencil hit the floor.

Initial velocity (u) = 0 m/s

Acceleration due to gravity (g) = 9.8 m/s²

Time (t) = 0.45 s.

Final velocity (v) =?

v = u + gt

v = 0 + (9.8 × 0.45)

v = 0 + 4.41

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6 0
3 years ago
Consider a system of a cliff diver and the Earth. The gravitational potential energy of the system decreases by 25,000 J as the
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Explanation:

From the question,

The formula for gravitational potential is given as

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W = mg.................... Equation 2

Where W = weight of the diver.

Substitute equation 2 into equation 1

Ep = Wh

Make W the subject of the equation

W = Ep/h................... Equation 3

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Substitute into equation 3

W = 25000/44

W = 568.18 N.

Hence the weight of the diver = 568.18 N

5 0
3 years ago
. Each valve A, B, and C, when open, releases water into a tank at its own constant rate. With all three valves open, the tank f
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Answer:

Time taken by A and B is 1.2 hr.

Explanation:

Given that

Time taken by tank when all(A+B+C) are open = 1 hr

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If we treat as filling of tank is a work then

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Lets take work is 1 unit

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1 = 1.5(1/a+1/c)           ----------2

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From equation 1 and 3

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From equation 3

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So time taken by

A is alone to fill tank is 2 hr

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C is alone to fill tank is 6 hr

So time\ taken\ by\ A\ and\ B =\dfrac{2\times 3}{2+3} hr

Time taken by A and B is 1.2 hr.

7 0
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