Question

A phonograph record turns at the rate of 33 1/3 revolutions per minute. In how many seconds will the record revolve 180 Degrees?

Answer 1

I know that 33 1/3 can be 100 revolutions and I know that a revolution is equal to 360 degrees and a minute has 60 secs. How do I solve for this?

Answer 2

First you need to convert revolution into degrees and minute in seconds.

1 Revolution=360 degree
1 Minute=60 seconds

Answer 3

yup

Answer 4

So would there be 50 revolutions per minute? Thus there are 6/5 per 180 degrees? @AravindG

Answer 5

So there are 50 180degrees per minute right? So there are 5/6 seconds in 180?

Answer 6

33 1/3=100/3 Right?

You multiply that with 360 degrees to find angle turned.

Answer 7

so 12000? What is next?

Answer 8

@TheSmartOne @zepdrix

Answer 9

Yep.

Answer 10

Now convert minute to seconds and divide the angle by time in seconds.

Answer 11

@TheSmartOne @zepdrix

Answer 12

Cool so 72000 seconds is the conversion. Then do this 180/72000 or 360/72000? @AravindG

Answer 13

Here are the answer choices btw 1/3, 3, 1 4/5, 9/10, 10

Answer 14

What dod you get when you divided the angle and time in seconds?

Answer 15

Which angle are you talking about 360 or 180?

Answer 16

When the record spins exactly one time back around to its starting position, a point on the rim of the record has traveled 360 degrees.

In 33 1/3 revolutions, a point on the rim of the circle travels 33 1/3 times 360 degrees per minute.

A minute is 60 seconds.

33 1/3 = 100/3 as an improper fraction

In 100/3 revolutions, a point on the rim of the circle travels 100/3 times 360 degrees per 60 seconds.

In how many seconds will the record revolve 180 Degrees?

Set up a proportion:

(100/3) * 360 180
------------ = -----
60 x where x is the number of seconds for a
180 degree spin.



12000 = 180
----- -----
60 x

x = ? @HELP!!!!

Answer 17

@HELP!!!! Any questions?

Answer 18

Thanks!!

Answer 19

You are welcome. I hope the proportion makes sense.

Answer 20

Yup I does! Thanks for the clarification!!