<span>In a
real machine, the work output is always less than the work input is true. The answer
is letter A. it follows the law of entropy where no energy can be converted completely
into work. Under this law, Carnot’s theorem states that Carnot’s engine can
perform 100% of work. However, no such engine has ever succeeded the conversion
of work into 100%. The greatest efficiency so far is at 80%. Because there will always be factors that
could affect the conversion of work. </span>
C is the best answer
hope it helped
Answers:
40 mp/h; Vector
Reason:
120/3 is 40 miles per hour.
Velocity is a vector measurement.
^.^
- Amanda
Answer:
Explanation:
Given
Lowest four resonance frequencies are given with magnitude
50,100,150 and 200 Hz
The frequency of vibrating string is given by
![f=\frac{n}{2L}\sqrt{\frac{T}{\mu }}](https://tex.z-dn.net/?f=f%3D%5Cfrac%7Bn%7D%7B2L%7D%5Csqrt%7B%5Cfrac%7BT%7D%7B%5Cmu%20%7D%7D)
where n=1,2,3 or ...n
L=Length of string
T=Tension
Mass per unit length
When string is clamped at mid-point
Effecting length becomes ![L'=0.5 L](https://tex.z-dn.net/?f=L%27%3D0.5%20L)
Thus new Frequency becomes
![f' =\frac{n}{L}\sqrt{\frac{T}{\mu }}](https://tex.z-dn.net/?f=f%27%20%3D%5Cfrac%7Bn%7D%7BL%7D%5Csqrt%7B%5Cfrac%7BT%7D%7B%5Cmu%20%7D%7D)
i.e. New frequency is double of old
so new lowest four resonant frequencies are 100,200,300 and 400 Hz
I am pretty sure the answer is C.