Answer: B. A magnet pulls a nail towards it
Explanation: Out of the list of answers, this is the only answer where a force is acting on an object. the act of the magnet pulling on the nail is the force, and the nail is the object.
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We know that P = hρg
Where:
P - pressure Pa,
h - height in meter,
ρ – would be the density in kg / m^3; and
g - acceleration due to gravity is m / s^2
p = hρg if h = 0.735 meter, ρ = 13600 kg / meter^3, g = 10 meter/ sec^2
p = 0.735*13600*10 = 99960 Pa or
P = 1 x 10^5 Pa
Now with sea water if we have to make a barometer:
ρ = 1100 kg / meter^3 (given)
P = hρg if we put the value of P calculated and the value of ρ = 1100 kg /
meter^3 given, we will
get, 1 x 10^5 = h*1100*10
therefore, h = 9.09 meter or 29.82 feet of water.
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