Answer:
They had the same speed.
Explanation:
It won't be velocity, because velocity is a vector quantity. Speed is scalar.
Since Alejandro hopes to combine the findings from the collected studies and draw a general conclusion regarding the subject, he is using statistical tool of inference.
There are basically 2 types of statistical tools:
- Descriptive statistical tools
- Inferential statistical tools
Descriptive tools are used to describe data. They include the use of tables, graphs, measures of dispersion, measures of central tendencies, etc.
Inferential tools are used to deduce conclusions from data. They include measures of significant differences, probability, correlation and regression, etc.
In this case, Alejandro would need to subject the data collected from the 35 studies to inferential statistical analysis tools in order to be able to make relevant conclusions.
More on types of statistics can be found here: brainly.com/question/13335435
Answer: a) The Answer to the question is option a) None of it.
Explanation:
The reason is because according to the law of conservation of energy Energy can neither be created nor destroyed but can be transformed from one form to the other. Therefore none of the kinetic energy was dissipated, rather it was transformed to another form of energy.
Answer:
time = 2.7 days
Explanation:
Given:
Water temperature = 60°F
Air temperature drops = 30°F
1st day drop is = 10°F
Now according to Newtons law of cooling,
where dT is change in temperature
dt is change in time
k is coefficient of cooling
T is temperature
is ambient temperature = 30°F
∴
Integrating we get
ln(T-30) = -k.T+C -----------------------------(1)
Now when t = 0, T = 60°F
when t = 1, T = 60-10
= 50°F
∴ln(60-30) = -k.0+C
ln 30 = C
Now putting the value of C in (1)
ln (T-30) = -k.T+ln30
ln ( T -30) - ln 30 = -kt
ln ( t-30) / (30) = -k.T
Now at t - 1
ln (50-30) / 30 = -k x 1
ln ( 20/30 ) = -k
ln 2/3 = -k
∴
Let T = 40°F
t = 
= 2.7 days
