1.
Advantages of Pneumatics over
Hydraulics– (write/type the 5 key things from the flashcards
Commonly seen hydraulics based equipment types
are hydraulic presses, hydraulic hoppers, hydraulic cylinders, and hydraulic
rams.
Pneumatic powered equipment is more suitable,
particularly in industries where the factory units are plumbed for compressed
air.
In order to affect mechanical motion, pneumatics
employs compression of gases, based on the working principles of fluid dynamics
in the concept of pressure.
Any equipment employing pneumatics uses an interconnecting
set of components.
Hydraulics means use of pressurized fluids to
execute a mechanical task.
Chapter 18 - (write/type 3 key
things from the flashcards here)
Newton’s third law is every action has an equal and opposite
reaction.
Jet airplanes, fireworks, and recoil guns apply to Newton third
law.
Resistance -opposes forward movement...
2.
Chapter 19 - (write/type 5 key things from the flashcards
here)
Gasoline engines
take in a mixture of gas and air and Diesel engines take in just air, compress
it, and then inject fuel into the compressed air.
Pressure (P) is
proportional to the temperature
P=F/A, therefore F=
an x P.
Hybrid vehicles
have both gas engines, and electric motors and batteries, so they can use both
energy sources
Diesel engines are
more powerful, and therefore are used to power trains, cargo ships, and other
heavy vehicles.
3.
Inside the Teenage Brain – (write 3 key facts)
Public perception
is about building bigger and better brains
Sleep debts can
have a powerful effect on a teen's ability to learn and retain new material -
See more at
Sleep affects
memory and learning.
4.
Chapter
20 (write/type 5 key things from the flashcards here)
The engine had to
be quiet and had to deliver a lot of power.
A combustion engine
is an open pneumatic system
Sterling engine
considered a closed system because the working fluid remains inside the engine
Air and fuel vapor
enter the chamber on every cycle, are burnt, then are forced out into the open
air in a pneumatic system
No explosions inside
of the combustion chamber. Is requirement for the sting engine?
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Correct Response B: It is given in the question that
the numbers in the diagram are rounded to the nearest whole number. Let w represent
the length of the smallest side of the rectangle and l represent the
length of the longest side of the rectangle. Because of the rules of rounding,
the smallest possible value of w is 1.5 in. Note that if we were
smaller, say 1.49 in., then it would have been rounded down to 1 in. The same
line of reasoning applied to l indicates that the smallest possible
value of l is 3.5 in. Since the area of a rectangle A is given by
A = l × w, the smallest possible value for the actual area
of the given rectangle is A = (1.5 in.)(3.5 In.) = 5.25 square inches.
The largest possible value of w is 2.49 in. to two decimal places, 2.499
in. to three decimal places, 2.4999 in. to four decimals places, etc. Likewise,
the largest possible value of l is 4.49 in. to two decimal places, 4.499
in. to three decimal places, 4.4999 in. to four decimal places. Since these values
are very close to, but less than 2.5 in. and 4.5 in., respectively, we can
conclude that the area of the rectangle must always be less than (2.5
in.)(4.5 in) = 11.25 square inches. Therefore, the area of the rectangle must
be greater than or equal to 5.25 square inches and less than 11.25 square
inches (5.25 ≤ a < 11.25). Of the answer choices given, only 5.5
square inches is in this range.
Incorrect Response A: This response comes from
correctly noting that the smallest possible value for the side lengths are w
= 1.5 in. and l = 3.5 in., but by finding the sum of l and w
instead of the product of l and w. The sum of l and w
is not the area of the rectangle. The sum would be 5.0 inches, not 5.0
square inches.
Incorrect Response C: This response most likely
results from incorrectly calculating the largest possible area of the
rectangle, as described above. Incorrect Response D: This response comes
from using the values given in the diagram, and then finding the perimeter of
(i.e., the distance around) the rectangle, instead of the area of the
rectangle. The perimeter would be 12.0 inches, not 12.0 square inches.
Incorrect Response D: This response comes from using the
values given in the diagram, and then finding the perimeter of (i.e., the
distance around) the rectangle, instead of the area of the rectangle. The
perimeter would be 12.0 inches, not 12.0 square inches.
