Answer:
Her answer is not reliable.
Explanation:
Reliability and validity are two major concepts that are used to assess the standard and quality of response/research.
While validity of an instrument is the idea that the instrument measures what it intends to measure, reliability is all about consistency and whether or not results could be replicated.
While your friend's answer may be valid, it can't reliable because of the differences in her response within a short time.
Explanation:
The efficiency of a machine is 70% means 30% of the applied force is wasted in overcoming friction and 70% of the applied force is used to do the work
Runoff because the mud is a liquid and moves on an amount of water that is in it like with quicksand
Answer:
Explanation:
Given
Wavelength of radiation 
We know Energy of wave with wavelength 
is given by
where h=Planck's constant
c=velocity of light
=wavelength of wave
Hence the energy of the wave with wavelength 784 m is 
Answer:
they don't strech so they tear a muscle when they perform
Explanation:
