| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.12 |
| Score | 0% | 62% |
| 60 ft. | |
| 6 ft. | |
| 1 ft. | |
| 1.5 ft. |
fAdA = fBdB
For this problem, the equation becomes:
10 lbs. x 6 ft. = 40 lbs. x dB
dB = \( \frac{10 \times 6 ft⋅lb}{40 lbs.} \) = \( \frac{60 ft⋅lb}{40 lbs.} \) = 1.5 ft.
What's the first gear in a gear train called?
input gear |
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idler gear |
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driven gear |
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driver gear |
A gear train is two or more gears linked together. Gear trains are designed to increase or reduce the speed or torque outpout of a rotating system or change the direction of its output. The first gear in the chain is called the driver and the last gear in the chain the driven gear with the gears between them called idler gears.
Which of these is the formula for force?
F = ma |
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F = m/a |
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F = a/m |
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F = am2 |
Newton's Second Law of Motion states that "The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object." This Law describes the linear relationship between mass and acceleration when it comes to force and leads to the formula F = ma or force equals mass multiplied by rate of acceleration.
According to Boyle's law, for a fixed amount of gas kept at a fixed temperature, which of the following are inversely proportional?
pressure, density |
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density, volume |
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pressure, volume |
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volume, mass |
Boyle's law states that "for a fixed amount of an ideal gas kept at a fixed temperature, pressure and volume are inversely proportional".
Which of the following represents the force a surface exerts when an object presses against it?
normal force |
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friction |
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counter force |
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mass |
Normal force (FN) represents the force a surface exerts when an object presses against it.