Sirius has an apparent magnitude of -1.5. canopus has an apparent magnitude of -0.7. which of the following statements is true?

sirius is brighter than canopus.
sirius is hotter than canopus.
the brightness ratio is 1.5 : 0.7.
the absolute magnitude of sirius is 15.

The earth remains in orbit around the sun due to the force of gravity. how does the force of gravity exerted by the sun on the earth compare to the force of gravity exerted by the earth on the sun?

Alarge box of mass m is pulled across a horizontal frictionless surface by a horizontal rope with tension t. a small box of mass m sits on top of the large box. the coefficients of static and

A1-lb collar is attached to a spring and slides without friction along a circular rod in a vertical plane. the spring has an undeformed length of 5 in. and a constant k =25 lb/ft. knowing that the collar is released from being held at a determine, the speed of the collar and the normal force between the collar and the rod as the collar passes through b.