Gary needs to move a chair that is 20 pounds at a distance of 5 feet. How much work will he need to produce?
2 answers:
<h2>Hello!</h2>
The answer is:
The answer is the first option, 100 ft-lbs.
<h2>Why?</h2>To calculate the work done by an object over a distance, we need to multiply the applied force by the amount of movement (distance).
So, to calculate the work that Gary needs to do to move the chair, we need to use the following equation:
We are given,
Hence, the answer is the first option, 100 ft-lbs.
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Answer:
d = 68.5 x 10⁻⁶ m = 68.5 μm
Explanation:
The complete question is as follows:
An optical engineer needs to ensure that the bright fringes from a double-slit are 15.7 mm apart on a detector that is 1.70m from the slits. If the slits are illuminated with coherent light of wavelength 633 nm, how far apart should the slits be?
The answer can be given by using the formula derived from Young's Double Slit Experiment:
where,
d = slit separation = ?
λ = wavelength = 633 nm = 6.33 x 10⁻⁷ m
L = distance from screen (detector) = 1.7 m
y = distance between bright fringes = 15.7 mm = 0.0157 m
Therefore,
<u>d = 68.5 x 10⁻⁶ m = 68.5 μm</u>