The star sirius a has an apparent magnitude of −1.5. sirius a has a dim companion, sirius b, which is 10,000 times less bright than sirius a. what is the apparent magnitude of sirius b? can sirius b be seen with the naked eye?

Lets say that an object of a certain volume has a certin mass. what happens to its mass when you double its volume?

An object is 10 cm from the mirror, its height is 1 cm and the focal length is 5 cm. what is the image height? (indicate the object orientation by including the + or - sign with the answer.) hi = cm +1 -1 +10 -10

Which statement is best supported by the information in the chart? wave y is moving the fastest. wave x is moving the fastest. all of the waves are moving at the same speed. all of the waves have the same value of wavelengths per second.