Answer:
b. cannot be effectively tested
Explanation:
We know that density = Mass/Volume
Volume = Mass/density
Here mass = 7.65 g
density = 12.6 g/ml
So volume 7.65/12.6=0.607 ml =
Volume of cube , where a is the edge length
In this case
So the length of the side of a cube having a density of 12.6 g/ml and a mass of 7.65 g is 0.848 cm.
Answer: 363 Ω.
Explanation:
In a series AC circuit excited by a sinusoidal voltage source, the magnitude of the impedance is found to be as follows:
Z = √((R^2 )+〖(XL-XC)〗^2) (1)
In order to find the values for the inductive and capacitive reactances, as they depend on the frequency, we need first to find the voltage source frequency.
We are told that it has been set to 5.6 times the resonance frequency.
At resonance, the inductive and capacitive reactances are equal each other in magnitude, so from this relationship, we can find out the resonance frequency fo as follows:
fo = 1/2π√LC = 286 Hz
So, we find f to be as follows:
f = 1,600 Hz
Replacing in the value of XL and Xc in (1), we can find the magnitude of the impedance Z at this frequency, as follows:
Z = 363 Ω
The answer is 0 because of the velocity “u” doesn’t A