A note of frequency 2000Hz has a velocity of 400 ms! What is the wavelength of the note?
2 answers:
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thrust force getting from the burning of mass should balance the weight of the rocket
here thrust force is given as
now by force balance we can say
now plug in all values in this
so rate of mass burning per second will be 5600 kg per second in order to lift up the rocket
Answer:
<em>a) Jack does more work uphill</em>
<em>b) Numerically, we can see that Jill applied the most power downhill</em>
<em></em>
Explanation:
Jack's mass = 75 kg
Jill's mass =
Jill's mass = = 50 kg
distance up hill = 15 m
a) work done by Jack uphill = mgh
where g = acceleration due to gravity= 9.81 m/s^2
work = 75 x 9.81 x 15 = <em>11036.25 J</em>
similarly,
Jill's work uphill = 50 x 9.81 x 15 = <em>7357.5 J</em>
<em>this shows that Jack does more work climbing up the hill</em>
<em></em>
b) assuming Jack's time downhill to be t,
then Jill's time =
we recall that power is the rate in which work id done, i.e
P =
For Jack, power =
For Jill, power = =
<em>Numerically, we can see that Jill applied the most power downhill</em>