The transverse motion of a star can be determined by studying its spectrum. true or false

The most important difference between a wedge and an inclined plane is a. their size b. their shape c. how they are used d. what they are made of

The speed of light in a material is 0.50 c. what is the critical angle of a light ray at the interface between the material and a vacuum?

Abus travels 280km south along a straight path with an average velocity of 88km/h to the south. the bus stops for 24 min, then it travels 210 km south with an average velocity of 75 km/h to the south. how long does the total trip last?