Two solid spheres of radius r made of the same type of steel are placed in contact, as shown in the figures above. The magnitude of the gravitational force that they exert on each other is f1. When two other solid spheres of radius 3r made of this steel are placed in contact, what is the magnitude of the gravitational force that they exert on each other?.

Scientists observed a rock stratum and discovered some fossils. the image shows the fossils they discovered. what can you interpret from the image? an illustration showing layers rock with fossils embedded in some rock layers1. the dinosaur and the mammoth existed after the trilobites.2. the dinosaur and the armored fish existed before the trilobites.3. the trilobites and the armored fish died before the dinosaur.4. the trilobites and the armored fish were born after the dinosaur.5. the early mammoth is older than the trilobites.

What is 7/81 as a percentage? round your answer to the nearest tenth of a percent.

How many credit hours does a student typically need to complete general educational requirements at a four year college