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stellarik [79]
3 years ago
6

Find the force, in Newtons, on a rectangular metal plate with dimensions of 4 m by 8 m that is submerged horizontally in 9 m of

water. Water density is 1000 kg/m3 and acceleration due to gravity is 9.8 m/s2. If necessary, round your answer to the nearest Newton.
Physics
1 answer:
Irina18 [472]3 years ago
4 0

Answer:

F \approx 3*10^6

Explanation:

From the question we are told that:

Dimension of plate: 4 m by 8 m

Depth submerged d=9m

Water density \rho=1000 kg/m3

Gravity g=9.8m/s^2

Generally the equation for Volume is mathematically given by

 V=L*B*d

 V=4*8*9

 V=288

Therefore The mass of Plate is

 m=\rho*V

 m=1000*288

 m=288000kg

Generally the equation for Force on the plate is mathematically given by

F=ma

 F=288000*9.8

 F=2822400N

 F=2.8*10^6

 F \approx 3*10^6

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The amount of heat given by the water to the block of ice can be calculated by using
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\Delta T_w = 45.0^{\circ}-19.5^{\circ}C = 20.5^{\circ}C is the variation of temperature of the water.

Using these numbers, we find
Q=(30 g)(4.18 J/(g^{\circ}C))(20.5^{\circ}C)=2571 J

This is the amount of heat released by the water, but this is exactly equal to the amount of heat absorbed by the ice, used to melt it into water according to the formula:
Q = m_i L_f
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arsen [322]
<h2>Answer:</h2>

1000th multiple of the standard reference level for intensities.

<h2>Explanation:</h2>

The sound intensity level (β), measured in decibels, of a sound with an intensity of I is defined as follows;

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Where;

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Given from the question;

β = sound level = 30dB

Substitute this value into equation (i) as follows;

30 = 10 log (I / I₀)

Divide both sides by 3;

3 = log (I / I₀)

Take antilog of both sides;

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Solve for I;

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Therefore the intensity of the sound is 1000 times the standard reference level for intensities (I₀)

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