Atomic number 1,symbol H,name hydrogen
To answer this problem, we must remember that momentum is
conserved. Therefore,
Initial momentum = Final momentum
In this case we use angular momentum which it is defined
as:
Momentum =0.5 m ω^2
So finding for final angular velocity, ωf:
mi * ωi^2
= mf * ωf^2
120 kg * (0.5 rev / s)^2 = (120 kg + 22 kg) * ωf^2
ωf^2
= 0.2113
ω<span>f = 0.46 rev/s</span>
One percent annual chance of flooding does not mean it will happen with absolute certainty once every 100 years. Just that the expected value of a flood in 100 years is one.
As an example, heads has a 50% chance of happening every coin flip. With 2 coin flips, the expected value is one. However, it would be a misnomer to call "heads" a 2-flip outcome.
Answer:
1.40 N
Explanation:
The magnitude of the frictional force is given by:
where
is the coefficient of friction
N is the magnitude of the normal reaction
The coefficient of friction for this problem is 
. The magnitude of the normal reaction is equal to the combined weight of the boy and the sled, because the surface is horizontal, so
Therefore, the frictional force is
