A primary source. That would be a source coming directly from someone who was in the war so you know it is reliable and probably the most accurate. A secondary source could be from a journalist or an outside mind that doesn't know the true experience of being in the war and is just observing from an outsiders view.
Answer: PE = 800j, KE = 800J
Explanation:
To calculate the potential energy, we use the formula
Potential Energy = Mgh
M = 20kg, g = 10m/sˆ2 , h = 4m
=20 × 10 × 4
=800J
At the maximum height S = 4 and the initial velocity u = 0 The acceleration g = 10m/sˆ2
Using the third equation of motion
vˆ2 = uˆ2 + 2as
= 0ˆ2 + 2 × 10 × 4
vˆ2 = 80
Kinetic Energy (KE) is given by
KE = ½ mvˆ2
= ½ × 20 × 80
=800J
The author wants to provide a factual description of North Dakota.
The "statistical power" of a research study is the probability that it will produce a statistically significant result if the research hypothesis is true.
Statistical power refers to the probability that an examination will distinguish an impact when there is an impact there to be recognized. On the off chance that statistical power is high, the likelihood of making a Type II error, or finishing up there is no impact when, truth be told, there is one, goes down. Statistical power is influenced essentially by the span of the impact and the extent of the example used to recognize it.
