Match each item with the clean water regulation it describes. (2 points)
1 answer:
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Answer:
Explanation:
The power delivered in the wire is given by:
where V is the voltage of the battery and R is the resistance of the wire.
Since the voltage of the battery is constant, we can rewrite this equation as follows:
(1)
At the beginning, the initial resistance is , and the power delivered is
. Later, when the temperature increases, the power becomes
, and the new resistance is
. Using (1), we can write
(2)
So, the new resistance must be 3/2 of the initial resistance.
We know that the resistance increases linearly with the temperature, as
where
is the temperature coefficient
is the change in temperature
Using (2), we can rewrite this equation as
and we find:
So, the new temperature of the wire must be
Answer:
The total work done by the mover is 2.81 kJ.
Explanation:
Given the 46 kg crate is displaced by 10.4 meters.
And the acceleration is zero. Also,
let is applied force,
is the net force,
is the mass and
and
As the acceleration is zero, the net force will also be zero.
.
Now, we know the work done is force times displacement.
So,
So, the total work done by the mover to displace 46 kg crate by 10.4 meters 2.81 kJ.