Three identical lightbulbs are in series with a battery in a closed circuit. if a fourth identical lightbulb is added in parallel with the third lightbulb, what happens to the brightness of the first and third lightbulbs? o a. both get brighter. o b. the first lightbulb gets brighter, the third gets dimmer ° c. the first lightbulb kets dimmer, the third gets brighter. 0 d. both get dimmer

Awave travels at a speed of 5.2 m/s. if the distance between crests is 0.40 m, what is the frequency of the wave? use f=v/wavelength a. 13 hz b. 2.1 hz c. 0.077 hz d. 5.6 hz

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.

The ability to make things happen is also called a. heat b. force c. matter d. energy