A student needs to travel a total of 400 miles to reach his vacation destination . if he drives at an average speed of 50 mph how many hours will it take for him to complete the 400 miles ??.

The answer is 8 hours.

Explanation:

M : H

50 : 1

400 : X

400 * 1 = 50 x

400 / 50 = 8

It'll take the student 8 hours.

Explanation:

All you need to do is divide 400 by 50 which is 8. To check this answer multiply 50 x 8 and it'll also equal 400.

electrical potential energy =0.072 j

explanation:

electrical potential energy is given by

u= q δv

q= charge=6 c

δv= potential difference and is given by

δv= e d

e= electric field

d= distance=5 mm=0.005 m

δv=2.4 (0.005)=0.012 v

now electric potential energy= u= q δv

u=6 (0.012)

u=0.072 j