Calculate the energy transferred by an appliance using mains electricity (230V) if the charge is 150C. Give your answer in kiloj
1 answer:
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The potential at a distance r from a charge Q is given by
where ke is the Coulomb's constant.
The charge in our problem is
; for the point at 
, the potential is
For the point at infinity, we immediately see that the potential is zero, because
and so 
.
Therefore, the potential difference between the two points is
where ke is the Coulomb's constant.
The charge in our problem is
For the point at infinity, we immediately see that the potential is zero, because
Therefore, the potential difference between the two points is
Answer:
4.53 second, 195 ft/s
Explanation:
u = 50 ft/s
h = 555 ft
g = 32 ft/s^2
Let the time taken by the ball to reach the ground is t and the velocity of the ball as it hits the ground is v.
Use third equation of motion
v = 195 ft /s
Thus, the ball strikes the ground with velocity 195 ft/s.
Use first equation of motion
v = u + at
195 = 50 + 32 t
32 t = 145
t = 4.53 second
Thus, the ball reach the ground in 4.53 second.