Answer:
Explanation:
The system of equation is the following:
We can solve the system by expliciting C from the second equation. We get:
And if we know substitute C into the first equation, we find
And by substituting D into the second equation, we find
The meter is the S.I.unit for length.
First of all we state the formula
Power=work done/time
we can rearrange this formula as well
work done=power x time
Since the SI unit of time is in seconds we change the minutes to seconds
2mins= 60x2 = 120 seconds
Using our formula (work done=power x time) we simply put in the values
work done = 4500 x 120
work done = 540,000J
Answer:
a)30.67 m/s
b)348,12 Hz
c)32,34 m/s
d)289,69 Hz
Explanation:
a)
To convert 69 mph to m/s we have:
b)
For a resting receiver and an approaching source we have the following Doppler formula:
where is the source, and c is the speed of sound, f the perceived frequency and the frequency as perceived by the source. Plugging all the relevant values we get:
c)
Using the same formula as above and solving for we have:
d)
Now we have another Doppler formula for a source that is moving away from the receiver:
Answer:
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Explanation:
The gravitational force of the earth keeps us bound to the earth. Gravitational force between earth and sun makes the earth move around the sun. Gravitational force between moon and earth makes the moon go around the earth.