Explain the relationship of each two dances. 1. Folk dance and Ethnic dance
2. Hip-Hop dance and breakdance
3. Modern and Contemporary dance

Please help me with this one. I need your help guys.

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?

Assume that a person skiing high in the mountains at an altitude of h = 15100 ft takes in the same volume of air with each breath as she does while walking at sea level. determine the ratio of the mass of oxygen inhaled for each breath at this high altitude compared to that at sea level. assume that the air composition (i.e. % of air that is oxygen) is the same at sea level as it is at 15100 ft.

Acalorimeter uses the principle that thermal energy flows from hotter material to colder material until both reach the same