Answer:
4.6 kHz
Explanation:
The formula for the Doppler effect allows us to find the frequency of the reflected wave:
where
f is the original frequency of the sound
v is the speed of sound
vs is the speed of the wave source
In this problem, we have
f = 41.2 kHz
v = 330 m/s
vs = 33.0 m/s
Therefore, if we substitute in the equation we find the frequency of the reflected wave:
And the frequency of the beats is equal to the difference between the frequency of the reflected wave and the original frequency:
A small summary of the 4 areas can be described as:
<em>Location: </em>The tradition of location tries to explain the course of human settlements in terms of location, growth and in relation to other premises.
<em>Area analysis tradition</em> determine as much as possible to obtain information about a particular place to define, describe and differentiate it from other regions or areas.
<em>Culture-environment tradition</em> is the study of the relationship between human beings and the land in which they live. Culture-environment not only analyzes the impact that people impose on their local environment, but, on the contrary, how natural hazards can influence human life.
<em>Earth Science Tradition</em> is the study of planet Earth as the home of humans and their systems. Along with the physical geography of the planet, the study approaches include things like how the location of the planet in the solar system affects its seasons (this is also known as Earth-Sun interaction) and how changes in the lithosphere, hydrosphere, atmosphere and Biosphere impacts human life on the planet.
Therefore the correct answer is B.
Explanation:
Momentum before = momentum after
m₁ u₁ + m₂ u₂ = m₁ v₁ + m₂ v₂
(50.0 kg) (0 m/s) + (12.0 kg) (0 m/s) = (50.0 kg) (2.0 m/s) + (12.0 kg) v
v = -8.33 m/s
Complete question is;
The abc battery company claims that their batteries last 100 hours, on average. You decide to conduct a test to see if the company's claim is true. You believe that the mean life may be different from the 100 hours the company claims. you decide to collect data on the average battery life (in hours) of a random sample of n = 20 batteries. some of the information related to the hypothesis test is presented below:
Test of H0: μ = 100 versus H1: μ ≠ 100
Sample mean: 98.5
Std error of mean: 0.777
Assuming the life length of batteries is normally distributed, what is the p-value associated with this test?
Answer:
p-value = 0.00001
Explanation:
We are given;
Null hypothesis; H0: μ = 100
Alternative Hypothesis; H1: μ ≠ 100
Sample mean: x = 98.5
Standard error of mean; s = 0.777
To find the test statistic, we will use the formula;
t = (x - μ)/(s/√n)
t = (98.5 - 100)/(0.777/√20)
t = -1.5/0.1737
t = -8.64
Now, from online p-value from t-score calculator attached, using t = -8.64; DF = n - 1 = 20 - 1 = 19; two tail distribution;significance level of 0.05; we have;
The p-value = 0.00001