An empty graduated cylinder weighs 82.450
1 answer:
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We can take as positive direction the direction of the train, and as negative direction the direction of the girl. The speed of the train relative to the girl will be given by the difference between the two velocities:
which means
which means
Answer:
Explanation:
Let the mass of copper ball is "m" gram
now the total number of copper atom present in the ball is given as
now the total number of electrons in one copper atom is 29
so total number of electrons in given sample of copper ball is
now diameter of the ball is 7.0 mm
density of the ball =
now we have
now we have
now the charge on the copper ball is 40 nC
so the number of electrons removed
so the fraction of number of electrons removed is given as
Answer:
v = 29.4 m / s
Explanation:
For this exercise we can use the conservation of mechanical energy
Lowest starting point.
Em₀ = K = ½ m v²
final point. Higher
= U = m g h
Let's use trigonometry to lock her up
cos 60 = y / L
y = L cos 60
Height is the initial length minus the length at the maximum angle
h = L - L cos 60
h = L (1- cos 60)
energy is conserved
Em₀ = Em_{f}
½ m v² = mgL (1 - cos 60)
v = 2g L (1- cos 60)
let's calculate
v² = 2 9.8 3.0 (1- cos 60)
v = 29.4 m / s