Question

What is the mass of a solid iron wrecking ball of volume 18.0
cm^{3}? Take the density of iron to be 7.80 x
10^{3} kg/m^{3}. Hint: convert volume to
m^{3}.

Select one:

a. 1.91 x 10^{8} kg

b. 2.70 x 10^{11} kg

c. 1.40 x 10^{3} kg

d. 0.140 kg

e. 191 kg

Q2: Consider a bed of nails with an upper weight limit of 200
lbs (which corresponds to a weight of 889 N). Each nail has a tip
area of 7.85 x 10^{-7} m^{2}. When a 200-lb man
lies down on the bed, the pressure at each nail point is 39.5 PSI.
How many nails does the bed have?

Select one:

a. about 6400 nails

b. about 8700 nails

c. about 4160 nails

d. about 1000 nails

e. 4.41 x 10^{7} nails

Q3:What is the difference in blood pressure (in Pascals) between
the bottom of the feet and the top of the head of a 1.45-m-tall
person standing vertically? Take the density of blood to be 1060
kg/m^{3}.

Select one:

a. 1.18 Pa

b. 136 Pa

c. 1.16x10^{5} Pa

d. 1.51x10^{4} Pa

e. 1.71x 10^{4} Pa

Q4 :Determine the absolute pressure on the bottom of a swimming
pool 28.0 m by 8.50 m whose uniform depth is 1.80 m. Also determine
the absolute pressure against the *side* of the pool near
the bottom.

Select one:

a. 1.76 x 10^{4} Pa 1.76 x 10^{4} Pa

b. 2.74 x 10^{5} Pa
1.76 x 10^{4}Pa

c. 1.013 x 10^{5}
Pa
1.013 x 10^{5} Pa

d. 1.19 x 10^{5}Pa 2.74 x 10^{5} Pa

e. 1.19 x 10^{5}
Pa
1.19 x 10^{5} Pa

The surface of the water in a storage tank is 25.0 m above a water faucet in the kitchen of a house. In other words, the head of water is 25.0 m at the faucet. Calculate the difference in water pressure between the faucet and the surface of the water in the tank. Where is the pressure greater, at the faucet, or at the surface of the water?

Select one:

a. 2.45 x10^{5} Pa faucet

b. 1.013 x 10^{5} Pa surface of the water

c. 136 Pa surface of the water

d. 30.0 Pa faucet

e. 2.94 x 10^{5} Pa faucet

Answer #1

Blood plasma flows with a rate of 0.34 cm3/s through a tube with
a diameter d = 0.15 cm and length l = 2.0 m at a temperature of
20°C. The pressure at the tube entrance is P2 = 1.90 x 104 N/m2. If
the temperature of the tube and plasma reaches 31°C, what is the
tube entrance pressure P2’ needed to maintain the flow rate and
pressure at the tube exit constant. Consider η20°C = 1.81 mPa ·s
and...

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...

For the Control Volume approach,
Select one:
a. we need to know the fluid properties (such as velocity,
pressure, density) at every point inside the Control Volume
b. we need to know the fluid properties (such as velocity,
pressure, density) along the Control Surface
c. we need to know the fluid properties (such as velocity,
pressure, density) at every point inside the Control Volume as well
as along the Control Surface
According to the principle of buoyancy a body totally...

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...

What is the change in length of a metal rod with an original
length of 4 m, a coefficient of thermal expansion of 0.00002/ ° C,
and a temperature change of 30° C?
1.
2.4 mm
2.
12 mm
3.
1.2 mm
4.
24 mm
Determine the number of electrons passing through a point in the
wire in 8 minutes when the current is 10 A.
a.
3 * 1016 electrons
b.
none of these
c.
4,800 electrons
d.
1.6...

1) 20 kg/min water at 20º C is mixed adiabatically with 40
kg/min water at 80 ºC. What is the outlet water temperature?
Select one:
a. 80 °C
b. 60 °C
c. 50 °C
d. 70 °C
2)
Steam at 0.8 MPa and 500 ºC is throttled over a well insulated
valve to 0.6 MPa, what is the outlet temperature
Select one:
a. 450 ºC
b. 500 ºC
c. DOF>0
d. 400 ºC
3)
Humid air at 70 C and...

The curator of a science museum is transporting a chunk of
meteorite iron (i.e., a piece of iron that fell from the sky -- see
picture at left) from one part of the museum to another. Since the
chunk of iron weighs 1240 N and is too big for her to lift by
herself, she is using a hand cart (see figure at right). While
passing through the marine mammals section of the museum, she
accidentally hits a bump and...

If the number of moles of an ideal gas in a firm container
doubles while volume and temperature remain constant …
a. pressure doubles
b. pressure quadruple
c. pressure remains constant
d. pressure is reduced to half
e. pressure is reduced to a quarter
a
b
c
d
e
incorrect
IncorrectQuestion 2
0 / 1 pts
There are 3 balloons sitting next to each other, each of a
different size. What is in the biggest...

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