A 4.04 kg block slides down a smooth, frictionless plane having an inclination of 30◦. The acceleration of gravity is 9.8 m/s^2.
1 answer:
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Explanation:
We need to apply the conservation law of linear momentum to two dimensions:
Let = momentum of the 1st ball
= momentum of the 2nd ball
In the x-axis, the conservation law can be written as
or
Since we are dealing with identical balls, all the m terms cancel out so we are left with
Putting in the numbers, we get
In the y-axis, there is no initial y-component of the momentum before the collision so we can write
or
Taking the ratio of the sine equation to the cosine equation, we get
or
Solving now for ,
Answer:
molecular formula =
Explanation:
Given data
c = 92.25%
H = 7.75%
molar mass = 104 g/mol
to find out
the empirical and molecular formula for styrene
solution
we know that
styrene 1 g contain = 0.9225 g C and 0.0775 g H
so
C = 104 × 0.9225 g / 12 g/mol
C = 7.995 mol = approx 8 mol
and
H = 104 × 0.0775 g / 1 g/mol
H = 8.06 mol = approx 8 mol
so we say that 1 mole of styrene have 8 mole of C and H
so
molecular formula =