Homework Help: physics

Posted by kim on Tuesday, November 11, 2008 at 10:06pm.

1. A cart of weight 20 N is accelerated across a level surface at .15 m/s^2. What net force acts on the wagon? (g=9.8m/s^2)

2. An automobile of mass 2000 kg moving at 30 m/s is braked suddenly with a constant braking force of 10000 N. How far does the car travel before stopping?

3. An airplane of mass 1.2 X10^4 kg tows a glider of mass .6X10^4 kg. The airplane propellers provide a net foward thrust of 3.6X10^4 N. What is the gliders acceleration?

how do i solve these?

physics - drwls, Wednesday, November 12, 2008 at 1:37am
You solve #1 and #3 by applying Newton's Second Law, F = m a.

For the second problem, you first need to solve for the required deceleration rate. a = F/m = 5 m/s^2
The time it takes to stop is
t = Vo/a = (30 m/s)/5 m/s^2 = 6 s
The distance travelled while stopping is that stopping time multiplied by the average velocity (Vo/2),
15 m/s * 6 s = 90 m

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