When placing a fulcrum in a lever, to get the greatest mechanical advantage, you would need to make the length of the effort arm greater than the length of the load arm. why?

Two friends at different locations want to communicate with each other by sending low energy signals. which of the following methods can they use to communicate? a) produce x-rays using colliding electrons and send them to radios, which capture sound b) send messages using infrared radiation, which travel in the form of waves c) send radio waves through intervening media like radio and television d) produce sound waves using microwaves from heated objects

How many atoms are there in 5.70 mol of mg

How do you convert 4 mmol of bromobenzene to ml?