Question

1.If atmospheric pressure is 1.013 x 10^{5}
N/m^{2} and creates a column of mercury 760 mm high. What
is the density of mercury in kg/m^{3} ?

No units needed.

2.A car jack works when a mechanic uses a force 1.5 N, on a small piston of radius 6 cm. What force can he exert on a larger piston of radius 0.39 m ?

3If atmospheric pressure is 1.013 x 10^{5}
N/m^{2} , what height of water in meters would it create
? remember density of water is 1000
kg/m^{3}.

No units needed.

Answer #1

A submarine is located 250 meters below the surface of the
ocean. The density of ocean water is 1030 kg/m3.
Determine the force on a window of the submarine that has an area
of 108 cm2. Atmospheric pressure is 1.013 x
105 Pa.

If the molecular weight of air is 28.9, what is the density of
air at atmospheric pressure and a temperature of 368.7 K? 1 atm =
1.013×105 N/m2, the mass of a proton is 1.67262 × 10?27 kg ,
Avogadro’s number is 6.02214 × 1023 mol?1 and k = 1.38065 × 10?23 N
· m/K . Answer in units of kg/m3.

A pipe of radius 10 cm has a pressure of 1.2 x 105 N/m2 as it
goes up to a second floor 3.1 m up, it decreases in size to a
radius of 5 cm and a water speed of 8.0 m/s
Find the water speed in the first part of the pipe.
Find the pressure in the second part of the pipe.

A car tire contains 0.0380 m3 of air at a pressure of
2.20 × 105 N/m2 (about 32 psi). How much more
internal energy does this gas have than the same volume has at zero
gauge pressure (which is equivalent to normal atmospheric
pressure)?
The answer is 677 x 103J, but I am not sure how to
solve it. Thank you so much!!!

You are a treasure hunter and ﬁnd an ancient Egyptian shipwreck
under the Mediterranean Sea. The ship is ﬁlled with silver bars (at
points in Egyptian history silver was more valuable than gold!).
The shipwreck is located 1500 m below the water’s surface. Sea
water has a density of about 1020 kg/m3. Silver has a density of
10500 kg/m3. The Young’s modulus of silver is 8.3 x 1010 N/m2. The
shear modulus of silver is 3.0 x 1010 N/m2. The...

a) The tires on a small truck contain enough air to provide a
gauge pressure of 1.8 105 Pascals. Each tire has 0.026 m2 of
surface area pressed against the ground. From this information,
what is the mass of the truck?
b)A beach ball has a radius of 19 cm and its density is about
3.22 kg/m3. What force is required to hold it completely submerged
under water? magnitude N

1 in = 2.5 cm. 1 atm = 760 torr density of mercy = 13.6 g/mL at
25 oC gravity = 9.8 m/s2
R = 0.082 L.atm/mol.K PV =
nRT
Force = mass x acceleration
Pressure = Force/area
Today’s atmospheric pressure is 32.0” of mercury. What is the
pressure in ‘atm’ units?
The burette used in the lab has a cross-section area of 1
cm2 so that a height of 1 cm provides a volume of 1
cm3 (that is...

1. A person pushes on a doorknob with a force of 5.00 N
perpendicular to the surface of the door. The doorknob is located
0.800 m from the axis of the hinges of the door. The door begins to
rotate with an angular acceleration of 2.00 rad/s2. What
is the moment of inertia of the door about hinges?
Select one:
a. 6.50 kg.m2
b. 2.50 kg.m2
c. 12.5 kg.m2
d. 2.00 kg.m2
2. A dumbbell has a connecting bar of...

a) i. Explain the difference between elastic and plastic
behaviour. [2 marks] ii. Explain how stretching an object gives
rise to internal shear. [3 marks] iii. What is meant when a
material is described as having non-isotropic properties? [1
mark]
b) Water circulates throughout a house in a hot water heating
system. The water is pumped at a speed of 0.50 ms–1 through a 4.0
cm diameter pipe in the basement at a pressure of 3.0 x 105 Pa.
What...

A grey body is one whose absorptivity
1. does not vary with temperature and wavelength of the incident
ray
2. is equal to its emissivity
3. varies with temperature
4. varies with wavelength of the incident ray
A liquid is in equilibrium with its vapor at its boiling point.
On an average, the molecules in the liquid and gaseous phases have
equal
1. potential energy.
2. kinetic energy.
3.temperature. 4. intermolecular forces of attraction.
A liquid of density 1000 kg/m3...

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