Copper, because it has the lowest specific electrical resistance.
specific electrical resistance aka volume resistivity is a fundamental property of a material that quantifies how strongly that material opposes the flow of electric current. A low resistivity indicates a material that readily allows the flow of electric current.
Solution :
Given data :
Mass of ice, m = 200 g
Mass of water, M = 500 g
Temperature of ice = 0°C
Temperature of water = 20°C
We known ;
The latent heat of fusion of water is
The specific heat of water, C = 4.18 kJ/kg K
a). Heat required to change the ice into water is :
J
Heat required to cool the warm water is :
From above result,
This means that total ice could not melt.
So, the temperature must be T = 0°C
b). Q' = mL
m = 0.1253 kg
m = 125.3 g
m = 125 g
Therefore, 125 g of ice had melted.
Answer:
The density of the wooden cube is
Explanation:
Recall that the weight of the entire piece of wood that is floating must equal the weight of the displaced water in the case we have an object under flotation.
At the same time. we have a relationship between Volume (V), Weight (w) and density given by the formula:
Since both weights must be the same, we can write the following equation:
Answer:
50 Ohms
Explanation:
Given that
the original resistance of the wire is 2 ohms, then
it is known that the equivalent resistance in a parallel circuit is
1/R(eq) = 1/R1 + 1/R2 + 1/R3 + 1/R4 + 1/R5.......+ 1/Rn
Giving that there are 5 pieces, then we stop at number 5.
Since R(eq) is 2, we substitute for that, and then we have
1/2 = 1/R + 1/R + 1/R + 1/R + 1/R
1/2 = 5/R
R = 5 * 2
R = 10 ohms
Since each R is 10 ohms, and the wire was cut into 5 pieces, we can then say that the original resistance of the wire is
R + R + R + R + R
10 + 10 + 10 + 10 + 10
total original resistance is 50 Ohms
Answer:
The new force becomes 3 times of the initial force.
Explanation:
Let q₁ and q₂ are two charged particles. The force between them is given by :
If
and
Also, r' = r/2
New force,
Putting all the above values,
So, the new force becomes 3 times of the initial force.