Tell Meh If Dey Are Positive or Negative Acceleration Please

8. A roller coaster car’s acceleration is in the same direction as its motion.

9. A roller coaster car’s acceleration is in the opposite direction of its motion.

Suppose that recording station n is located 200 km north of the epicenter of an earthquake, and recording station s is located 100 km south of the epicenter of the same earthquake. which of the following statements would be true?

Air is to be preheated by hot exhaust gases in a cross-flow heat exchanger before it enters the furnace. air enters the heat exchanger at 95 kpa and 20°c at a rate of 0.6 m^3/s. the combustion gases (cp = 1.10 kj/kg°c) enter at 160°c at a rate of 0.95 kg/s and leave at 95°c. determine the rate of heat transfer to the air and its outlet temperature.

Which system of units is used by only a small number of countries in the world, including the u.s.