5. Eliza starts from rest at the top of a 35 m hill, snowboards down a 30° incline into a valley, and continues up a 25 m hill. Both hill heights are measured from the valley floor. Assume you can neglect friction. a. How fast is Eliza snowboarding at the bottom of the valley?

b. What is Eliza’s speed at the top of the next hill?

True or false when elements combine to form a mixture, the resulting chemical properties may be very different from those of the elements that make it.

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.

Infrared radiation has wavelengths that are shorter than visible light is part of the visible light spectrum has wavelengths that are longer than visible light has the same wavelengths as ultraviolet radiation