Answer:
7.75%
Explanation:
mass of climber, m = 55 kg
height, h = 701 m
Qc = 4.5 x 10^6 J (heat exhaused by the body)
Work = m x g x h
W = 55 x 9.8 x 701
W = 377839 J
W = QH - Qc
Where, QH is the heat input
QH = 377839 + 4.5 x 10^6
QH = 4877839 J
So, the efficiency
e = W / QH
e = 377839 / 4877839
e = 0.0774 = 7.75 %
Thus, the efficiency of the body is 7.75 %.
Answer: B. Increases
Explanation:
An electron is a negatively charged particle, while a proton is positively charged.
Opposites attract so as it approaches the proton the force of attraction will increase.
Answer:
Doppler effect
Explanation:
this means that at one point when the person running is close to the observer it will appear to run fast but slower as he moves away from the observer
Answer:
We use X-rays to help the injured, Radiowaves to communicate or entertain, and Visible light to see.
During the operation of fan we know that it is working on the electricity
So here when we connect the fan with electricity it uses the electrical energy and convert that energy into mechanical energy of fan
Fan uses this electrical energy to rotate the blades of fan and then it gives the high speed air to us
So here correct answer must be
B.
motion energy
