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## Homework Statement

The question shows a circle labeled as follows

-A at the uppermost point

-B at the most-right point

-C at the lowest point

-D at the most-left point

so, the length along the circle from A to B (and B to C, C to D, D to A) is one quarter of the circumference.

There is a particle traveling along this circle at constant speed, and completes one revolution in 5.0seconds.

a) average speed for one revolution

b) average speed from A to B

c) average velocity for one revolution

d) average velocity from A to C

e) average velocity from A to B

f) change in velocity from A to C

g) change in velocity from A to B

## Homework Equations

a = (v^2)/r

v = wr

## The Attempt at a Solution

I thought I understood circular motion and the definitions for speed and velocity until I came upon this question :(

a) Well, speed is velocity without a direction, but when something is moving around a circle, it's direction is constantly changing so I'm unsure how to go about this question

b) same problem as (a)

c) I thought this to be zero, since it returns to its original displacement but I'm not sure if it is asking for angular or linear... are definitions different? Or if it isn't mentioned, is it normally linear?

d) and e) same problem as (c)

f)&g) thought acceleration was just (v^2)/r... I'm not sure thought because they ask from one place to another, not around the entire circle.

Question 2..

## Homework Statement

The turning circle of an F16 jet fighter when flying at a constant speed of 650 metres per second, has a radius of 80km. What is the angle of bank the plane must make to achieve this manoeuvre? (The angular tilt of its wings)

## The Attempt at a Solution

I.. have no idea. The answer says 28.3 degrees, and I tried finding the angle using the velocity in one direction and acceleration perpendicular to it, with trig, but it comes out as 0.47 degrees (way too low)

That's it for now I guess >_>

Thanks ^^