Evaporation is the process by which water changes from a liquid to a gas or vapor. Evaporation is the primary pathway that water moves from the liquid state back into the water cycle as atmospheric water vapor. Studies have shown that the oceans, seas, lakes, and rivers provide nearly 90 percent of the moisture in the atmosphere via evaporation, with the remaining 10 percent being contributed by plant transpiration.
We need to find the average speed of the ball during the motion of 1 m
In order to find that we took several reading and found following times to cover the distance of 1 m
t1 = 2.26 s
t2 = 2.38 s
t3 = 3.02 s
t4 = 2.26 s
t5 = 2.31 s
Now in order to find the average time we can write
So average time to cover the distance of 1 m by ball will be 2.45 s
here 3.02 s is not the average time but we can say it is the median of the readings of all possible values which we can not use in our calculation as average time
Answer:
a.
The hypothesis Null and alternative can be formulate as a :
H0 = μ = 7.5 hr / week
Hₐ = μ < 7.5 hr / week
b.
The Null hypothesis is true and the administrator believes that the college freshman dot not spend 7.5 hours
E(x) = μ = 7.5 hr / week
SE (x) = σ / √ n = 9 / √100
SE (x) = 0.9
Z' = 6.6 - 7.5 / SE
Z' = 6.6 -7.5 / 0.9 = -1
The empirical rule in this case is use
% = (100 - 68 ) / 2 = 16%
c.
There is not strong arguments of Null Hypothesis so can be accept the H0 and is no significantly different from the report of 7.5 hr / week
Answer:
KE= 1/2mv^2= 1/2*0.0042kg*993m/s= 2.0853joule
