An empty density bottle has a mass Xg. Its mass is 50g when full of water and 45g when full of another liquid of density 800kg/m3". Calculate the mass of empty density bottle.

According to social exchange theory, altruistic behaviors benefit the individual who performs them.

10 newton object is placed 3 meters from the fulcrum. at what distance on the other side would you need to place a 15 newton object to balance the lever? show your work!

Awater-filled u-tube manometer is used to measure the pressure inside a tank that contains air. the water level in the u-tube on the side that connects to the tank is 5 ft above the base of the tank. the water level in the other side of the u-tube (which is open to the atmosphere) is 2 ft above the base. determine the pressure within the tank.