Answer:
407 steps
Explanation:
From the question,
P = mgh/t........... Equation 1
Where P = power, m = mass, g = acceleration due to gravity, h = height, t = time.
Make h the subject of the equation
h = Pt/mg............. Equation 2
Given: P = 746 W, t = 1 minute = 60 seconds, m = 70 kg.
Constant: g = 9.8 m/s²
Substitute into equation 2
h = 746(60)/(70×9.8)
h = 44760/686
h = 65.25 m
h = 6525 cm
number of steps = 6525/16
number of steps = 407 steps
We know, U = F * h
U = 25 * 3
U = 75 J
In short, Your Answer would be 75 Joules
Hope this helps!
Answer: The mole fraction of 
, 
and 
are 0.4950 , 0.4040 and 0.100 respectively.
Explanation:
According to Dalton's law, the total pressure is the sum of individual pressures.
The partial pressure of a gas is given by Raoult's law, which is:
......(1)
where,
= partial pressure of substance A
= total pressure
= mole fraction of substance A
a) mole fraction of
b) mole fraction of
c) mole fraction of
<span>So we want to know when do we have enough information about the atom that we can say that it is electrically neutral. So the information we need to know is the number of protons, whic are positively charged particles and the number of electrons which are negatively charged particles. Number of protons has to be equal to number of electrons for the atom to have neutral charge. Neutrons are electrically neutral so their number doesn't change the charge of the atom. So the correct answer is B. </span>
