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What is the term for number of vibrations per second?
Hertz are used to measure cycles per second. Sound is measured in hertz. I hope I understood the question.
What is measured by meters per second per second?
The speed of an object falling from a great height is measured in meters per second per second until it reaches terminal velocity (maximum downward speed).
Which quantity can be measured in the units feet per second per second?
Acceleration
How is the unit lightyear measured?
It's calculated, not measured. It's the speed of light ... 299,792,458 meters per second ... multiplied by the number of seconds in a standard year.
Explain per second per second?
"Per second per second" is a measurement of acceleration. If an object (such as a car) is moving, its speed can be measured in terms of miles per hour, or feet per second (which work out to be a similar figure to miles per hour). If the car is accelerating, the acceleration can be measured in terms of additional speed (feet per second) that is acquired in a given second, therefore, feet per second per second. Get it?
