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Just find the mean, i.e, the average of the two speeds.An aeroplane travels at an average speed of 600 km h–1 on an outward flight and at 400 km h–1 on
the return flight over the same distance.
What is the average speed of the whole flight?
A 111 m s–1 B 167 m s–1 C 480 km h–1 D 500 km h–1
32)
Power = Energy / time.
27)
λ = ax / D
Thank u just one question y do u do distance between 2 nodes I mean isnt the normal way just 33 cm?s12_s12
17)
At the bottom height is zero so mgh = zero
now going upwards..
2 block has height = 1 so mg1h
3 block = mg2h
4 block = mg3h
Sum up P.E ans is 6mgh
29)
c = f * λ
We know f = 1 / t
so c = 1 / t * λ
t = λ / c
now it took 3 wavefronts to reach XY to P
so t = 3λ / c
30)
Its a standing wave, so the 33cm is the distance between two nodes. The wavelength thus becomes .66m. F = 330/0.66 = 500. T = 1/500 = 0.002s = 2ms. B is the right answer
s07_1
Suchal Riaz
me gtg
Standing waves !Thank u just one question y do u do distance between 2 nodes I mean isnt the normal way just 33 cm?
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