Answer:
1456 N
Explanation:
Given that
Frequency of the piano, f = 27.5 Hz
Entire length of the string, l = 2 m
Mass of the piano, m = 400 g
Length of the vibrating section of the string, L = 1.9 m
Tension needed, T = ?
The formula for the tension is represented as
T = 4mL²f²/ l, where
T = tension
m = mass
L = length of vibrating part
F = frequency
l = length of the whole part
If we substitute and apply the values we have Fri. The question, we would have
T = (4 * 0.4 * 1.9² * 27.5²) / 2
T = 4368.1 / 2
T = 1456 N
Thus, we could conclude that the tension needed to tune the string properly is 1456 N
Answer:
I think its Pound or a gram
Answer:
Charge,
and it is negative.
Explanation:
Given that,
Mass of the charge, 
Electric field, E = 640 N/C
To find,
Charge
Solution,
The electric force and the force of gravity are balanced in the electric field. It is given by :




Since, the electric field is in downward direction. The force must be upward direction s that the charge is negative.
If
and
are perpendicular, then their dot product is zero. This means

Solving for n is trivial; it follows that n = 3.
Molecular mass may be calculated by taking the atomic mass of each element present and multiplying it by the number of atoms of that element in the molecular formula. Then, the number of atoms of each element is added together. This value may be reported as a decimal number or as 16.043 Da or 16.043 amu.