Answer:
90 A
Explanation:
Applying,
P = VI.............. Equation 1
Where P = Power, V = Supply voltage, I = current.
Make I the subject of the equation
I = P/V.............. Equation 2
From the question,
Assuming the Voltage of the main electric supply is 120 V
Given: P = 10.8 kW = 10800 W, V = 120 V (household voltage)
Substitute these values into equation 2
I = 10800/120
I = 90 A
The experiment that led scientists to change from the previous model to the one shown is that; the colors of light emitted from heated atoms had very specific energies.
The model of the atom showed in the image is the Bohr model of the atom. This model was the successor of the Rutherford model of the atom.
This model proposed that electrons were found in specific energy levels that has a definite value of energy.
This was arrived at after he discovered by experiments that the colors of light emitted from heated atoms had very specific energies.
Learn more: brainly.com/question/3964366
Answer:
Explanation:
For flow of heat through conduction , the formula is
Q = KA( T₂ -T₁ ) / d where K is thermal conductivity of material , A is surface area , T₂ - T₁ is temp diff .
Thermal conductivity of aluminum is 205 W /m.s
Surface area of cane = 2π r² + 2π r h where r is radius and h is height of cane .
A = 2π r ( r + h )
= 2 x 3.14 x 1.3 x .0254 ( 1.3 x .0254 + 4.83 x .0254 )
= .20736 ( .033 + .12268 )
A = .03228 m²
thickness d = .12 x 10⁻³ m
Putting the values ,
Q = 205 x .03228 x ( 25 - 4 ) / .12 x 10⁻³
= 1158 x 10³ J /s
Gold has almost 4 times the atomic weight of iron. Check the table of elements.D<span>ensity is Mass divided by its volume, right? Gold has a higher atomic weight than iron, so it will be much heavier.</span>
