Answer:
27 lifts
Explanation:
Let no. of lifts be n.
W = F x S
W = nmg x S
10530 = n(60)(10) x 0.65
600n = 10530/0.65
600n = 16200
n = 16200/600
n = 27
=> He needs to do 27 lifts
Answer:
Internal energy lost by a system is always gained by the surroundings
The universe is an isolated system
According to the first law of thermodynamics:
<h2><em>"Energy is not created, nor destroyed, but it is conserved."
</em></h2>
Then this law relates the work and the transferred heat exchanged in a system through the internal energy, which is neither created nor destroyed, it is only transformed.
In other words: The change in the internal energy of a system is equal to the net heat that is transferred to it plus the net work done on it.
The probability that the mean race time is less than 4. 3 minutes is 0.3534.
<h3>
Normal distribution curve</h3>
A normal distribution curve can be used to determine the probability of selecting a mean race time less than 4.3 minutes.
<h3>In normal distribution curve</h3>
- Mean = median = 50%
- 1 standard deviation below the mean (M - d) = 16%
<h3>Time of race at 1 standard deviation below the mean</h3>
5.18 - 1(2.34) = 2.84 minutes
4.3 minutes is greater than 2.84 minutes but less than 5.18 minutes.
Apply interpolation method to determine the probability corresponding to 4.3 minutes.
5.18 ---------------- 50%
4.3 ------------------- ?
2.84 ----------------- 16%
x = 0.37
The area of normal distribution curve is not equal at all points, it is more towards the center and less towards the left. The probability will shift little to left, with a value of 36% or 35%.
Thus, the probability that the mean race time is less than 4. 3 minutes is 0.3534.
Learn more about normal distribution curve here: brainly.com/question/14644201
I believe the forces are Unbalanced.
So B.