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lisabon 2012 [21]
3 years ago
12

Please answer this soon. Thank u.

Physics
1 answer:
vodomira [7]3 years ago
6 0

Answer:

The distance used to calculate the pressure of atmosphere is 75 cm.

Explanation:

  • Mercury barometer is used to find the pressure of the atmosphere where it is placed.
  • As shown in the figure, the barometer has an inverted tube where mercury has risen by 75 cm. This height is taken into count to measure the atmospheric pressure.
  • At the place with high pressure the mercury in the inverted tube will go very high and vice versa.
  • Hence to find the pressure we must note down the height of mercury that has risen the inverted tube.
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A swimming pool, 10.0 m by 4.0 m, is filled with water to a depth of 3.0 m at a temperature of 20.2°c. if the energy needed to r
Tomtit [17]

You need to find the mass of water in the pool.
Find the volume (10 x 4 x 3) = 120 m3

Water has a density of 1000g/m3,so 120 m3 = 120 x 1000 = 120 000 kg

[delta]H = 4.187 x 120 000 x 3.4 (and the units will be kJ)

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3 years ago
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Propose an experiment that could be used to demonstrate that friction is a contact force?
vesna_86 [32]
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3 years ago
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The mass of a spacecraft is about 435 kg . An engine designed to increase the speed of the spacecraft while in outer space provi
svlad2 [7]

Answer:

Δ v =  125 m/s

Explanation:

given,

mass of space craft = 435 Kg

thrust = 0.09 N

time = 1 week

       = 7 x 24  x 60 x 60 s

change in speed of craft = ?

Assuming no external force is exerted on the space craft

now,

T= m_s a

a=\dfrac{T}{m_s}

a =\dfrac{0.09}{435}

a = 2.068 x 10⁻⁴ m/s²

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Δ v = a t

Δ v = 2.068 x 10⁻⁴ x 7 x 24 x 60 x 60

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3 0
3 years ago
What is a load force
vladimir2022 [97]

Answer:

A push or pull exerted on an object

8 0
3 years ago
How many signifficant figures do the following number have 258​
Romashka [77]

Answer:

<u>Facts about 258</u>

<u>Sig Figs</u>

3

<u>258</u>

<u>Decimals</u>

0

<u>Scientific Notation</u>

2.58 × 102

<u>E-Notation</u>

2.58e+2

<u>Words</u>

two hundred fifty-eight

Explanation:

258 Rounded to Fewer Sig Figs

2 260                2.6 × 102

1 300           3 × 102

5 0
2 years ago
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