5. A girl whose mass is 52 kg exerts a force of 25 N on a ball. Calculate the a) acceleration of the ball.
b) the final velouhcity of the ball if the time it takes the ball to reach a
distance of 20 m is 3 minutes.
c) work done by the girl.
d) power of the girl.

Light from the sun reaches the earth in 8.3 minutes. the velocity is 3.00 x 10^8 m/s. how far is earth from the sun? i know how to get to d = (3 x 10^8 m/s)(498 sec). i just don't know how to get from there to the answer being 1.5 x 10^11 m.

A5 foot by 5 foot box culvert is buried 6 feet beneath the surface of the ground. a crosssection of this very long culvert (into and out of the page) is illustrated below. assume that the soil in which the culvert is buried has the following properties: jt = 120 pcf, w = 12%, ko = 0.50, ka = 0.33, and kp = 3.00. calculate the total horizontal force per unit length of culvert (fh) felt on one of the vertical faces of the culvert.

Amagnetic field applies forces on: a)static chargesb)moving chargesc)water flow