Odpowiedź:
Szczegółowe wyjaśnienie:
a)
F = mg, m, to mg = F /:g to m = F/g
F = mg, g, to mg = F /:m to g = F/m
b)
d =m/V, m, to m/V = d /•V to m = Vd
d = mV, V, to mV = d /:m to V = md
c)
p = dgh, d, dgh = p /:gh to d = pgh
p = dgh, g, dgh = p /:dh to g = p/dh
p = dgh, h, dgh = p /:dg to h = p/dg
II
E = (1/2)mv² + mgh
a) g, to (1/2)mv² + mgh = E mgh = E - (1/2)mv² /:mh to
g = E/mh - (1/2)v²/h
b) v,
E = (1/2)mv² + mgh to (1/2)mv² + mgh = E to (1/2)mv² = E - mgh
(1/2)mv² = E - mgh /:(1/2)m to v² = E/(1/2)m - mgh/ (1/2)m
v = √[E/(1/2)m - mgh/ (1/2)m]
