Aweather balloon is released into the atmosphere. you know the initial volume, temperature, and air pressure. what information will you need to predict its volume when it reaches its final altitude? which law would you use to calculate this volume?

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

Select the correct answer how does the heat content of the reaction change in the process of photosynthesis when a glucose molecule is formed? ca the value of is negative the value of qis positive the value of a remains constant the value of a decreases the value of equals zero e

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.