Answer:
Q = 640425 J = 640.425 KJ
Explanation:
From the law of conservation of energy:
Heat Addition = Heat Gain of Water + Heat Gain of Aluminum Kettle
where,
Q = Heat addition required = ?
= mass of water =1.8 kg
= mass of aluminum kettle = 1.1 kg
= specific heat capacity of water = = 4200 J/kg.°C
= specific heat capacity of aluminum kettle = = 890 J/kg.°C
= = change in temperature of water and kettle = 95°C - 20°C = 75°C
Therefore,
Q = 567000 J + 73425 J
<u>Q = 640425 J = 640.425 KJ</u>
Answer:
<em>The amount of charge increases.</em>
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Explanation:
For a capacitor that has its plates still connected to a battery, the voltage on the capacitor remains constant. If the distance between the two plates of this capacitor is decreased, the capacitance will increase, and then the charge on the plate will increase in accordance with the relationship
Q =CV
From this relationship, if V is held constant, then Q has to increase for C to increase also.
Answer:
The ant
Explanation:
we know that the formula to calculate the work is: Fs
even though the elephant does exert force on a big tree, the distance it moved, which is s, is zero. F*s = F*0 = 0. It doesn't do work.
in contrast, the ant does exert force to drag a housefly, and it does move it, so it is doing work.
Answer:
The answer is V = 0.9*C
Explanation:
from the relativity formula we have to:
Δt = γ * Δto
Clearing γ:
γ = Δt/Δto
Replacing values:
γ = 2070 s/900 s = 2.3
γ = 1/((1-(V/C)^2)^1/2)
1/((1-(V/C)^2)^1/2) = 2.3
1/(1-(V/C)^2) = 2.3^2
1/(1-(V/C)^2) = 5.29
Clearing V:
V = C * ((1 - (1/5.29))^1/2) = 0.9*C