A 1200 -kg car moves due north with a speed of 15 m/s. An identical car moves duc with the same speed . What are the direction and the magnitude of the system's total momentum ?

An object weigh 40n in air ,weigh 20n when submerged in water,and 30n when submerged in a liquid of unknown liquid density.what is the density of unknown of liquid?

Match each scenario to the form of energy it represents

You are doing a science experiment with a fahrenheit thermometer. your data must be in degrees celsius. if you measure a temperature of 125°f, what is this temperature in degrees celsius