If a car is traveling 60 mph, its tires may have an rpm of 840. how many revolutions do the car’s tires make in one second?
due tomorrow
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Forget about the car's speed.  You don't need it.

The tires spin 840 rpm.  That's 840 Revolutions per Minute .

There are 60 seconds in 1 minute.  So something that happens 840 times in 1 minute happens (840 / 60) times every second.

(840 rev per minute) / (60)  =  14 revs per second .

the answer is ampere

the ampere is used to measure electricity. an ampere is a unit of electric current equal. a unit of measure for the flow of current in a circuit. one ampere is the amount of current flow provided when one volt of electrical pressure is applied against one ohm of resistance.