How is the federal government is limited in its powers

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

Should the city pass a ban on skateboarders on all public property, or are the citizens who oppose the ban right when they argue that there are benefits to having the skateboarders in public parks? plan and write a response in which you state your position and persuade readers to agree with you. support your position with reasons and examples drawn from the proposed amendment to ban skateboarding and from information in the letters to the editor, as well as from your own experience.

For an actor, keeping his mind on will ultimately his performance.