Q: What instrument is used to measure engine revolution per minute?

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"Radian" is a distance. "Revolution per minute" is a speed. Those two units measure different quantities, and they don't convert into each other. It'll help to know that 1 revolution is (2 pi) radians. So "one revolution per minute" is "2 pi radians per minute", etc.

Revolution Per Minute was created on 2011-06-28.

One Revolution Per Minute was created in 2002.

You cannot. Revolutions per minute are a measure of angular velocity whereas metres per minute are a measure of linear velocity. There is no simple way to convert from one to the other. For example, at any given rpm, a point on the rim of a wheel is moving much faster than a point near the hub. You need the distance of a point from the axis of revolution (in metres) to convert angular speed to linear speed. If the distance from the centre is r metres then the point moves through 2*pi*r metres every revolution. ie 1 rpm = 2*pi*r linear metres per minute.

You cannot in any sensible way. RPM is a measure of (angular) velocity whereas litres is a measure of volume. Your hard disk will have an rpm but what does litres mean in terms of the disk?

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The tachometer.

It is a tachometer, an instrument showing the speed of the engine in RPM (revolutions per minute).

The measure of speed in an engine is typically given in revolutions per minute (RPM). This indicates how many times the engine's crankshaft rotates within a minute. RPM is a key factor in determining the performance and power output of an engine.

"Radian" is a distance. "Revolution per minute" is a speed. Those two units measure different quantities, and they don't convert into each other. It'll help to know that 1 revolution is (2 pi) radians. So "one revolution per minute" is "2 pi radians per minute", etc.

15 revolution per second 900/60=15 60 seconds in a minute divide by 60 to get number of revolution per second

A theodolite is a survey instrument. A tachometer tells you how many Revs per minute an engine is turning.

Revolution Per Minute was created on 2011-06-28.

One Revolution Per Minute was created in 2002.

Yes, a tachometer in an internal combustion engine measures the crankshaft revolutions per minute (RPM). The tachometer provides real-time feedback on the engine's speed and helps the driver or operator monitor and control the engine's performance.

One revolution of the earth around the sun takes three hundred and sixty five and a quarter days. The French revolution paved the way for democracy. Combustion Engine - Revolutions Per Minute: RPM.

RPM (revolutions per minute) measures the number of times a crankshaft in an engine completes a full rotation in one minute. It indicates how quickly the engine's pistons are moving up and down, which in turn affects the speed and power output of the engine. Generally, higher RPMs mean the engine is operating at a faster speed.

You cannot. Revolutions per minute are a measure of angular velocity whereas metres per minute are a measure of linear velocity. There is no simple way to convert from one to the other. For example, at any given rpm, a point on the rim of a wheel is moving much faster than a point near the hub. You need the distance of a point from the axis of revolution (in metres) to convert angular speed to linear speed. If the distance from the centre is r metres then the point moves through 2*pi*r metres every revolution. ie 1 rpm = 2*pi*r linear metres per minute.