How do astronomers best learn about distant objects in the universe a. they collect and analyze data from their electromagnetic radiation. b. they analyze rock samples from space probes. c. they study nearby objects and match their properties with those of distant objects.

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j? 1. write the equation 2.list out your known variables 3.plug the numbers into the equations 4.solve 5.write your solution statement that includes initial energy and final

Anika asks eva to roll a basketball and then a bowling ball to her. which requires more force to roll, and why?

Calculate the volume of this regular solid. what is the volume of the cone? round your answer to the nearest hundredth