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glamorouspotato1251
22.08.2019 •
Physics
In a certain lightning flash, the potential difference between a cloud and the ground is! 1.0 x 109 v and the quantity of charge transferred is 30 c. (a) what is the change in energy of the transferred charge? (b) if all the energy released by the transfer could be used to accelerate a 1000 kg automobile from rest, what would be the automobiles final speed?
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Ответ:
a) 3.0 x 10¹⁰ J
b) 7.75 x 10³ m/s
Explanation:
a)
ΔV = potential difference between cloud and the ground = 1.0 x 10⁹ Volts
Q = Amount of charge transferred = 30 C
ΔU = Change in energy transferred
Change in energy transferred is given as
ΔU = Q ΔV
ΔU = (30) (1.0 x 10⁹)
ΔU = 3.0 x 10¹⁰ J
b)
v₀ = initial speed of the automobile = 0 m/s
v = final speed of the automobile = ?
m = mass of automobile = 1000 kg
Using conservation of energy
ΔU = (0.5) m (v² - v₀²)
3.0 x 10¹⁰ = (0.5) (1000) (v² - 0²)
v = 7.75 x 10³ m/s
Ответ:
The average time it took the car to travel 0.25 meters was 2.23 seconds
The average time it took the car to travel 0.50 meters was 3.13 seconds
Happy to help :)