A load of 400N is lifted by first class lever in which the load is situated 20m away from fulcrum and effort is situated 60m from fulcrum ,if 150N effort is applied on the lever then calculate the Mechanical Advantage and Velocity Ratio. HELP FAST PLSSS

Write the overall equation for the reaction for lithium battery

If 22.5 liters of oxygen reacted with excess of hydrogen, how many liters of water vapor could be produced?

Nebulae are enormous clouds in outer space. they are made mostly of hydrogen gas, helium gas, and dust. some nebulae glow brightly, while others do not. the stars that people see are huge, bright balls of glowing gas. they are made mostly of hydrogen and helium. which statement correctly describes other ways in which nebulae and stars are different? a. stars can form inside a nebula but a nebula can never be produced by any star. b. a star always has a higher density than a nebula. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star.