# Homework Help: Air Resistance and Projectile Motion Assignment Task

1. Aug 3, 2013

### kobijean

1. Hi, I'm currently in my second last year of highschool (Australia) and my Physics assessment task is all about cars, however, a stimulus Item is the Movie Speed, long story short, I need to find the minimum angle required, including air resistance at a velocity of 30 m/s.

2. I have tried almost every website, and I will get halfway through their steps, and something completely out of context comes through, take in note that we have never been taught projectile motion including air resistance.

3. Drag force = 7.79 Newtons
air density = 0.0013
Bus's drag co-efficient =0.8
Area of the front of the bus = 7m^2
I somehow found out that the Δt= 6.122 seconds
and i get fairly stuck after that.
and the jump is 27m

Last edited: Aug 3, 2013
2. Aug 3, 2013

### voko

With any problem, your first is to formulate the problem exactly and precisely. You have not done so; in fact, it is not even clear what the problem is about.

3. Aug 4, 2013

### kobijean

The question is finding the minimum angle the bus would have to jump off to make 27m jump, (jump is 15m, but av. bus length is 12m), taking air resistance into account.

4. Aug 4, 2013

### voko

So there is a bus. Its length is 12 m. It goes at 30 m/s up an incline with some unknown angle to the horizontal. The incline ends and there is a gap whose length is 15 meters. It is still unclear:

1. Is the opposite side at the same height as the edge of the incline?

2. How do you compute drag?

3. Are you supposed to take into account that as soon as the front wheels leave the incline, the bus begins to rotate?

5. Aug 5, 2013

### Basic_Physics

I think you would need to simplify the problem first.
1. Do not consider the bus's length.
2. Can you calculate the angle without taking drag into account?