Johnny was playing baseball with his friends and they noticed a bolt of lightning. They heard thunder seven seconds later. How far away is the storm?

meters

2380m

Explanation:

Given parameters:

Time taken to hear the sound after lightning  = 7s

Unknown:

Distance of the storm  = ?

Solution:

Light has been shown to travel faster than sound. To solve this problem,

                 Speed  =

Speed is the rate of change of distance with time

Distance  = speed x time taken

The speed of sound is given as 340m/s

Distance  = 340 x 7  = 2380m

the answer is b

explanation:

adding a(n) to an electric circuit would increase the magnetic field around a wire;

b. solenoid

a solenoid is a type of electromagnet whose purpose is to generate a controlled magnetic field.

if the purpose of the solenoid is instead to impede changes in the electric current, a solenoid can be more specifically classified as an inductor rather than an electromagnet.