# Uniform circular motion

1. May 13, 2015

### Bechensten

1. The problem statement, all variables and given/known data

An object is moving uniformly in circles with a radius of 5m and a frequency of 2 Hz. What is its instantaneous velocity?

2. Relevant equations

3. The attempt at a solution
The problem i am dealing with is the frecuency.
I am not here for an answer or to cheat. I am applying for a admission test and working on some old admission test that comes without a answer sheet. Please help me to understand the way to solve this problem so i can pratice further. Thank you

2. May 13, 2015

### SteamKing

Staff Emeritus
You should understand that the hertz (Hz) is a unit of frequency equal to one cycle per second.

3. May 13, 2015

### Staff: Mentor

How does frequency (which is given) relate to period (T)?

4. May 13, 2015

### Bechensten

So if 1hz i 360 degrees (5m) than 2hz is 10m. hz is by second so that means that the velocity is 10m/s, right?

5. May 13, 2015

### Bechensten

Doc Al, i dont know.. I cannot aford a teacher thats why im using methods like this to learn.. Instead behaving like that give me a chance or a clue like Steamking did..

6. May 13, 2015

### Staff: Mentor

No. 5 m is the radius of the circle here.

7. May 13, 2015

### Staff: Mentor

8. May 13, 2015

### Bechensten

Okey i think i got it. O=3.14x10= 31.4m.
1hz: 31,4m
2hz: 1hzx2=31,4x2=62,8m/s ?

9. May 13, 2015

### Staff: Mentor

Good!

FYI: Frequency and period are inverses of each other. Frequency is cycles per second; Period is seconds per cycle. So a frequency of 2 Hz, means a period of 1/2 seconds.

10. May 13, 2015

### Bechensten

Thank you! And thank you for your time and your advice, i will keep that in mind!
The same goes for you too steamking!