8. Humans need oxygen to break down food in order to provide energy for cells. The oxygen needed for this process is delivered by an organ system called the A. respiratory system. B. lungs. C. digestive system. D. alveolus.

Which energy is cuased by an objects vibration A thermal B electrical C chemical D sound

An airplane is in level flight at an altitude of 0.50 km and a speed of 150 km/h. At what distance d should it release a heavy bomb to hit the target X? Take g = 10 m/s2

A very low dense concentration of energy, in which the waves are quite spread apart is a characteristic sign of an area of __?__ of a wave.

A PWC is overtaking another vessel. Which vessel must give way?

What are black dwarfs? A) Cooled off white dwarfs that no longer glow visibly B) Pulsars that have slowed down and stopped spinning C) The lowest mass main sequence stars D) Objects that are not quite massive enough to be stars E) The end result of

Write two examples (mathematical expression) of physical laws that change inversely with the square of the distance.

What units must be used to express the temperature in the equation for the ideal gas law? explain?

Which region of the Sun is typically about 6,000 C?

How well does the infographic ""Plastics in the Ocean"" present a solution to the problem it describes?

Which of the following would be a good question that could be scientifically investigated? what is the best advice a parent can give a child what is the most appropriate number of dogs per household do cherry popsicles freeze slower than orange