A 62-kg man standing on a scale in an elevator notes that as the elevator rises, the scale reads 821 N. What is the acceleration
2 answers:
<h2>Answer:</h2>
3.24
<h2>Explanation:</h2><h2></h2>
Using Newton's law of motion,
F = ma ..........................(i)
where;
F = net force acting on the object (or body)
m = mass of the object (or body)
a = acceleration of the body.
<em>In this case,</em>
Two forces are acting;
(i)The weight (W) of the man = m x g = 62 x 10 = 620N
(ii)The tension (T) on the scale of the elevator = 821N
The weight(W) of the man is a downward force while the tension (T) on the scale of the elevator is an upward force. Since the elevator rises upward is positive.
Therefore,
Net force (F) = Total upward force(s) - Total downward force(s)
Net force (F) = 821 - 620
F = 201N
To calculate the acceleration of the elevator,
substitute the values of F = 201N and m = 62 into equation (i) above;
=> F = ma
=> 201 = 62 x a
=> a = 210 / 62
=> a = 3.24
Therefore the acceleration of the elevator is 3.24
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the peak wavelength when the temperature is 3200 K =
Explanation:
Given that:
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T = 0.2898×10⁻² m.K
The peak wavelength of the emitted radiation at this temperature is given by
=
=
Hence, the peak wavelength when the temperature is 3200 K =