Answer:
C is the correct answer, 35m/s
Explanation:
This is so because speed doesn't have direction, it is a scalar. Vectors such as velocity do.
The solution for this problem is:
v = sqrt(T/µ) where T = m*g = 4*g and µ = 0.0055/2.5 = 0.0022kg/m
Now L = 2 m
For a string the frequencies are n*v/2L
so n*v/2L = 64 and (n+1)*v/2L = 80
Now eqn 2 divided by eqn 1 yields (n + 1)/n = 80/64 = 1.25
=> 1.25 n = n + 1 or .25n = 1 or n = 4
now subbing back into eqn 1 we have 4*v/2L = 64 or v = 32*L = 32*1.9 = 60.8
So 60.8= sqrt(1.1*g/0.0022)
so 1.1*g = 60.8^2*0.0022 = > g = 60.8^2*0.0022/1.1 = 7.39 m/s^2
Answer:
Explanation:
There are several differences between a physical and chemical change in matter or substances. A physical change in a substance doesn't change what the substance is. In a chemical change where there is a chemical reaction, a new substance is formed and energy is either given off or absorbed.