GEAS – November 2010
Q: A spherical tank is made from 2.5mm thick plate and is
subjected to an internal pressure of 1400kPa. If you are
told that the tank cannot be subjected to a stress more
than 100MPa, what diameter of the tank would you use?
A: 714 mm
Solution:
D =
=
D = 714 mm
Q: A truck container is filled with 37,000 liters of diesel
fuel @ the origin. The driver experienced a cold weather
@ the destination 23 kelvin lower than the origin. The
coefficient of volumetric expansion of a diesel fuel is
9.5x10-4 /⁰C. How many liters of diesel fuel were delivered
@ the destination?
A: 36,191.55 L
Solution:
∆V = αvVo∆T
= (9.5x10-4)(37000)(-23)
∆V = -808.45 L
Vt = Vo + ∆V
= 37,000 – 808.45
Vt = 36,191.55 L
Q: A truck moves from rest and accelerates at a constant
rate of 10 m/s2, passes through a circular curve with
radius of 1000 m. How long does the truck move before
the normal component of acceleration e Quals the
tangential acceleration?
Solution:
Q: In eQuilibrium, Mars emits the same radiation as it
absorbs. If the orbital radius of Mars is 1.5 times the
radius of the earth around the sun, determine the
relationship of temperature of Mars to earth. Thus, the
temperature of Mars is ________ times that of the earth.
Solution:
Q: Find the minimum power reQuired when the pressure
changes from 2kPa to 6 MPa for a mass flux of water 10
kg/s.
Solution:
Q: The heart pumps blood into the aorta, which has an
inner radius of 1.0cm. The aorta feeds 32 major arteries. If
the blood in the aorta travels at the speed of 28 cm/s,
what is the average speed of the blood in the arteries?
Assume the blood can be treated as an ideal fluid and the
arteries each have an inner radius of 0.21cm.
Solution:
Q: Ten cubic ft of air is cooled at a constant pressure of
80psia. What is the change in internal energy if the initial
temperature was 180OF? [
Solution:
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