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?

Mass (kg) force (n) 5 25 10 50 15 75 20 100 a student was trying to find the relationship between mass and force. he placed four different masses on a table and pulled them using a spring scale. the table shows the different masses used in the experiment and the force required to pull each mass. the student concluded that more force was required to pull heavier objects. what comment would you make regarding his conclusion? a) no clear relation can be observed between mass and force from the data. b) there is a direct proportion between the mass and force listed in the table. c) gravity should have been taken into account while performing the experiment. d) there is an inverse proportion between the mass and force listed in the table.

Road users moving into your lane, brake lights, and abrupt changes in road surface are a. rare at night b. indicators of potential hazards c. not worth worrying about before you reach them d. no problem for experienced drivers

What is the weight of a feather (mass = 0.0001 kg) that floats through earth's and the moon's atmospheres?