a car was rolled up an inclined plane. it required a force of 20 kilograms to pull the car up the 50 meter length ramp to a final height of 10 meters. the car weighs 100 kilograms. what was the work accomplished using the ramp?

Aray of light traveling parallel to the principal axis of a concave mirror will be reflected through the mirror's

Consider an ordinary, helium-filled party balloon with a volume of 2.2 ft3. the lifting force on the balloon due to the outside air is the net resultant of the pressure distribution exerted on the exterior surface of the balloon. using this fact, we can derive archimedes’ principle, namely that the upward force on the balloon is equal to the weight of the air displaced by the balloon. assuming that the balloon is at sea level, where the air density is 0.002377 slug/ft3, calculate the maximum weight that can be lifted by the balloon. note: the molecular weight of air is 28.8 and that of helium is 4.

What is the freezing point of radiator fluid that is 50% antifreeze by mass? kf for water is 1.86 ∘c/m.