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ELEN [110]
2 years ago
11

Hey can anyone please help me with this it’s due in few hours and I’m stuck

Physics
1 answer:
Margaret [11]2 years ago
7 0

Answer:

1)  P = rho g h = d g h    where d is replacing the greek letter rho (density)

a)   pressure at A must be 1/2 that of B because of 1/2 the height

b) pressure at B equals that at D because the height is the same

 (Pascal's principle - pressure in a fluid is same in all directions)

c) pressure A is the same as that C

d) the pressure at B would be .8  of the water at B if paraffin replaced the water  (P = d g h = .8 * dw g h)      due to change in density

2)   Volume = 4 m X 3 m X 2 m) = 24 m^3    volume of tank

b) mass = volume * density  = 24 m^3 * 800 kg / m^3 = 19,200 kg

c) weight = mass * gravity = 19,200 kg * 9.8 m/s^2 = 188,160 Newton's

d) P = d g h = 800 kg/m^3 * 9.8 m/s^2 * 2 m 15,680 N/m^2

Pressure is given in force/area or N/m^2

3) Pw / Pp = dw / dp = 1000 / 800 = 1.25

Pw = 1.25 Pp = 15,680 m/s^2 * 1.25 = 19,600 Pascal's

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Answer:

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t' = 5 years

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Solution:

(a) Distance travelled in a round trip, d' = 2d = 20 c = L'

Now, using Length contraction formula of relativity theory:

L'' = L'\sqrt{1 - \frac{v^{2}}{c^{2}}}                           (1)

time taken = 5 years

We know that :

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5 = \frac{L''}{v}                                                      (2)

Dividing eqn (1) by v on both the sides and substituting eqn (2) in eqn (1):

\frac{L'\sqrt{1 - \frac{v^{2}}{c^{2}}}}{v} = 5

\frac{20'\sqrt{1 - \frac{v^{2}}{c^{2}}}}{v} = 5

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v = 0.97 c

(b) Time observed from Earth:

Using time dilation:

t'' = \frac{t'}{\sqrt{1 - \frac{v^{2}}{c^{2}}}}

t'' = \frac{5}{\sqrt{1 - \frac{(0.97c)^{2}}{c^{2}}}}

Solving the above eqn:

t'' = 20.56 years

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3 years ago
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Explanation:

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Applying the conservation of energy as :

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