What is the primary role of the respiratory system in living organisms?

A. to make carbon dioxide

B. to obtain oxygen

C. to use up nitrogen

D. to find hydrogen

A vibrating drum is an example of what kind of energy? 1) Nuclear 2) Chemical 3) Mechanical 4) Electrical

A sprinter runs 500 meters west in a straight line and then turns around and runs in the same straight line 300 meters east. What is the runner's displacement?

Which phrases describe organisms that formed index fossils

How much work is done by the gravitational force when a 265-kg pile driver falls 2.80m?

What is an important similarity between sound and light? a. Both are transverse waves. b. Both are longitudinal waves. c. Both travel with same speed in air. d. Both can show interference effects.

What is the critical angle θcrit for light propagating from a material with index of refraction of 1.50 to a material with index of refraction of 1.00? express your answer in radians?

Which of these could NOT be used to find the mechanical advantage of an inclined plane? A. input force B. output force C. percent efficiency D. length and height of inclined plane

What are the Rules of magnetism

Two spheres of the same radius, but of different masses, are both fully submerged in water. The lighter sphere is held below the water line by a rope anchored to the bottom of the container. The heavier sphere is suspended from a rope.

How does an increase in thermal energy affect molecules?