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Gravity
Terms in this set (32)
machine
A device that makes work easier
simple machine
A machine that does work with only one movement
lever
A simple machine that consists of a rigid bar that pivots about a fixed point.
inclined plane
A simple machine that is a flat, sloped surface; a ramp
wedge
a simple machine that is an inclined plane that moves
screw
a simple machine that consists of an inclined plane wrapped around a cylinder
Pulley
A simple machine that consists of a rope that fits into a groove in a wheel
wheel and axle
a simple machine consisting of two circular objects of different sizes; the wheel is the larger of the two circular objects
complex machine
two or more simple machines working together
System
A group of parts that work together as a whole
Subsystem
smaller group of parts within a complex machine that performs a specific function
Linkage
belt or chain to transfer energy from an energy source to an object
gears
two or more wheels linked together by interlocking teeth
Friction
A force that opposes motion
Efficiency
a measurement of how well a machine uses energy
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Verified questions
ENGINEERING
It is desired to transport liquid metal through a pipe embedded in a wall at a point where the temperature is 650 K. A 1.2-m-thick wall constructed of a material having a thermal conductivity varying with temperature according to k = 0.0073 (1 + 0.0054 T), where T is in K and k is in W/m $\cdot$ K, has its inside surface maintained at 925 K. The outside surface is exposed to air at 300 K with a convective heat-transfer coefficient of 23 W/ m2 $\cdot$ K. How far from the hot surface should the pipe be located? What is the heat flux for the wall?
ENGINEERING
Sketch or graph the given function, which is assumed to be zero outside the given interval. Represent it, using unit step functions. Find its transform. Show the details of your work. $$ e^t \text{ (0<t<π/2)} $$
ENGINEERING
The line voltage VAB at the terminals of a balanced three-phase Δ-connected load is 4160 ∠0° V. The line current IaA is 69.28 ∠-10° A. a) Calculate the per-phase impedance of the load if the phase sequence is positive. b) Repeat (a) for a negative phase sequence.
ENGINEERING
Determine the forces in members AB, BC, and BD of the loaded truss.
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