Explanation:
a) 120m
b) since Q is the first order constructive interference, the distance between mid point of antennas and Q is 0.5 wavelengths (appear in A-Level question). so the wavelength should be (2)(30) =60m
60m
The higher the voltage, the lower the current. ... The lower current that accompanies high voltage transmission reduces resistance in the conductors as electricity flows along the cables. This means that thin, light-weight wires can be used in long-distance transmission.
Answer:410 Hz
Explanation:
It is given that frequency of tuning fork is 415 Hz and hears a beat of 5 beat per second
so untuned frequency must be either 410 Hz or 420 Hz because beat frequency is the difference in frequency of two notes.
When she tightens the string the beat frequency decrease
and velocity
where
where T=tension
it T increase v also increases and from 1 st equation frequency is also increasing therefore untuned frequency must be 410 Hz because beat frequency is decreasing.
A set of two forces that are in opposite directions, have equal magnitudes and act on different objects
The angular speed of the lander must be 3.92 rpm
Explanation:
The (centripetal) acceleration of the lander is given by:
where
is the angular speed
r is the length of the arm
In this problem, we have
r = 7.75 m
(we are told that the acceleration of the lander must be the same as the acceleration due to gravity at the surface of Europa, which is
Therefore we can find the angular speed of the lander:
And keeping in mind that
We can convert this angular speed into rpm:
Learn more about rotational motion:
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