A race car is one lap behind the lead race car when the lead car has 47 laps to go in a
Your
race.
If the speed of the lead car is 61.9 m/s, what
must be the average speed of the second car
to catch the lead car just before the end of the
race (i. e., right at the finish line)? Assume 1
lap is 1.34 km.
Answer in units of m/s.

What is the single most important equation in all of physics?

Aresistor with an unknown resistance is connected in parallel to a 9 ω resistor. when both resistors are connected in parallel to an emf source of 21 v, the current through the unknown resistor is measured with an ammeter to be 4 a. what is the resistance of the unknown resistor? answer in units of ω.

Which statement is the best definition of an atom? a) anything that has mass and occupies space. b) the smallest particle that has the properties of an element. c) a substance that cannot be broken down chemically into simpler substances. eliminate d) the smallest unit of a substance that exhibits all of the properties characteristic of that substance.