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Science
Engineering
Mechanical Engineering
Harnessing the Elements - 2
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Flying
Terms in this set (15)
Gravity
the force that pulls all objects that have mass and energy toward one another
thrust
The force that propels a flying machine in the direction of motion
drag
a resistance force produced by friction with air or other fluid
lift
a force that acts upward as an object moves through air or other fluid
roll
the side-to-side rotation of an airplane during which one wing is raised while the other is lowered
rudder
part of an airplane that is used to turn or tilt the aircraft in flight
delta wing
a single triangular swept-back wing on some aircraft
supersonic
a speed greater than the speed of sound
wing flaps
a hinged and sometimes extendable portion of an aircraft wing used to increase lift and drag for making take-offs and landings at reduced speeds
airfoil
the curved surface of a wing that produces lift as the wing moves through the air
leading edge
the forward-most edge of an airfoil
Trailing edge flaps
flaps that line part of the edge of the wing and Increase lift and drag
Spoilers
flaps on top of the wing that rise to reduce lift and increase drag
ailerons
flaps at the rear edge of the wing that are raised or lowered to roll the aircraft in a turn
pitch
the up and down movement of the nose of an airplane
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Verified questions
computer science
Chapter 11 defined the ```class``` **boxType** by extending the definition of the ```class``` **rectangleType**. In this exercise, derive the ```class``` **boxTyp**e from the ```class``` **rectangleTyp**e, defined in Exercise 1, add the functions to overload the operators **+, -, *, ==, !=, <=, <, >=, >**, and pre- and post-increment and decrement operators as members of the ```class``` **boxType**. Also overload the operators **<<** and **>>**. Overload the relational operators by considering the volume of the boxes. For example, two boxes are the same if they have the same volume.
engineering
Bar $A B C$ is attached to collars $A$ and $B$ that can move freely on the rods shown. The constant of the spring is $k$ and the spring is unstretched when $\theta$ $=0$. $(a)$ Neglecting the weight of bar $A B C$, derive an equation in $\theta$, $m$, $k$, and $l$ that must be satisfied when bar $A B C$ is in equilibrium. $(b)$ Determine the value of $\theta$ corresponding to equilibrium when $m=5 \mathrm{~kg}$, $k=800 \mathrm{~N} / \mathrm{m}$, and $l=250 \mathrm{~mm}$, and check that the equilibrium is stable.
physics
A certain pigment absorbs green light, while reflecting blue and red wavelengths. If a surface coated with this pigment is illuminated by white light, what is the color of the light reflected from this surface? Explain
biology
the presence of a lophophore in a newly discovered species would suggest that the species ________.
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