You've decided to protect your house by placing a 5.7-m-tall iron lightning rod next to the house. the top is sharpened to a point and the bottom is in good contact with the ground. from your research, you've learned that lightning bolts can carry up to 45 ka of current and last up to 50 μs. how much charge is delivered by a lightning bolt with these parameters?

Explanation:

A lightning rod or a lightening conductor is a metallic rod installed from the top of the building to a depth in the ground where a wide metallic plate of copper is connected to it.

We know that current is the rate of flow of charge.

Mathematically,

...........................(1)

where:

Given:

To determine the charge that is delivered with the above parameters:

Using the eq.(1)

temp rises, and expansion

the minimum constant speed at which she can catch the train is 2.7 m/s

given:

acceleration = 0.6

time = 4.5 s

to find:

velocity = ?

formula used:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

solution:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

v = 0 + (0.6 × 4.5)

v = 2.7 m/s

the minimum constant speed at which she can catch the train is 2.7 m/s