Acar is at rest at the top of a driveway that has a slope of 12.5°. if the brake of the car is released with the car in neutral gear find: a. the acceleration of the car down the drive. b. the time it takes for the car to reach the street, 8.0m away.

Explanation:

angle of inclination, θ = 12.5°

initial velocity, u = 0 m/s

distance, s = 8 m

(a) acceleration, a = g Sinθ  

a = 9.8 x Sin 12.5°

a = 2.12 m/s²

(b) Let t be the time taken to reach the street.

Use II equation of motion

s = ut + 1/2 at²

8 = 0 + 0.5 x 2.12 x t²

t = 2.75 second

increases it

the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it