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1 answer:
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Answer:
density = 5000 [kg/m^3]
Explanation:
Density is defined as the relationship between mass and volume.
Now we have:
m = 100 [gr] = 0.1[kg]
V = volume = 20[cm^3]
density = 0.1 / (2 x 10^-5)
density = 5000 [kg/m^3]
Answer:
EMF = 11.35 V
R = 0.031Ω
Explanation:
To find the battery's EMF and the internal resistance we need to use Ohm's law:
Where:
V: is the voltage
I: is the current
R is the resistance
We have:
The current through the battery is 64.2 A and the potential difference across the battery terminals is 9.36 V:
(1)
When only the car's lights are used, the current through the battery is 1.96 A and the terminal potential difference is 11.3 V:
(2)
By solving equation (1) and (2) for R we have:
Hence, the internal resistance is 0.031 Ω.
Now, by entering R into equation (1) we can find the battery's EMF:
Therefore, the battery's EMF is 11.35 V.
I hope it helps you!
Answer:
The tension in the string connecting block 50 to block 51 is 50 N.
Explanation:
Given that,
Number of block = 100
Force = 100 N
let m be the mass of each block.
We need to calculate the net force acting on the 100th block
Using second law of newton
We need to calculate the tension in the string between blocks 99 and 100
Using formula of force
We need to calculate the total number of masses attached to the string
Using formula for mass
We need to calculate the tension in the string connecting block 50 to block 51
Using formula of tension
Put the value into the formula
Hence, The tension in the string connecting block 50 to block 51 is 50 N.