Answer:
El valor de la fuerza que debe ejercer la persona C debe ser de -2 para que la caja esté en equilibrio físico.
Explanation:
Si la caja debe hallarse en equilibrio físico, entonces se debe satisfacer la siguiente ecuación:
(1)
Si sabemos que y , entonces el valor de la fuerza que debe ejercer la persona C debe ser:
El valor de la fuerza que debe ejercer la persona C debe ser de -2 para que la caja esté en equilibrio físico.
Answer:
Or in the other way:
Explanation:
For this case we need to remember that hectare is a measure of area. And we have the following ratios:
We can convert this into
We can convert this into
By dimensional analysis we assume that we can find the ratio in terms of distance like this:
And if we find the ratios in terms of distance we got:
Or in the other way:
There are problems with the first sentence, and it's not really needed when
working with this question. So let's just take the 20 (Hz ?) frequency from
the first sentence, and ignore the rest of it for right now.
Wavelength = (speed) / (frequency) =
(331 m/s) / (20 Hz) = <em>16.55 meters</em>.
First of all, to work out the velocity at the bottom you can use the conservation of energy principle as friction isn't specified. So U = T or mgh =
, rearranging to get
. From this you get v = 11.72
. Following angular velocity ω =
which you can use to get ω = 6.9
.
Hope that helps