Which of the following is a trend among the main sequence stars?

A) Most of the stars are white or red.

B)The hotter the star, the more brightly it burns.

C) Stars dimmer than the Sun are of class O or B

D) The larger stars emit light that is blue.

Aperson stands on a platform, initially at rest, that can rotate freely without friction. the moment of inertia of the person plus the platform is ip. the person holds a spinning bicycle wheel with its axis horizontal. the wheel has moment of inertia iw and angular velocity ωw. take the ωw direction counterclockwise when viewed from above. part a what will be the angular velocity ωp of the platform if the person moves the axis of the wheel so that it points vertically upward?

Suppose a comet has an orbital period of 309.1 years around the sun. what is it’s average distance from the sun?

The vapour pressure of benzene is 53.3 kpa at 60.6 °c, but it fell to 51.5 kpa when 19.0 g of a non-volatile organic compound was dissolved in 500 g of benzene. calculate the molar mass of the compound.