Which substance is made of molecules?

a. water

b. table salt

c. aluminum foil

d. pure gold necklace

If a pulley system with an actual mechanical advantage of 2,000,000 is used in lifting a 2,000 lb. car, what effort would be needed to move the car?

The energy stored in oil come from the sun. Describe how energy from the sun became stored in oil

Which statement best describes the limits of science? a. science cannot answer any abstract questions. b. usually science can answer only mathematical questions. c. science cannot answer religious questions. d.

A ball is dropped from the roof of a building. If it takes the ball 2.6s to reach the ground, how tall is the building?

Which biome has the most extreme conditions

Do you think an observer on another planet in the solar system might see eclipses

A. A vector is any element of a vector space. Is this statement true or false? A. True by the definition of a vector space B. False; not all vectors are elements of a vector space. C. False; a vector space is any element of a vector.

19 Which gas is the most abundant greenhouse gas? A. ozone B. chlorofluorocarbon C. carbon dioxide OD. methane E. water vapor Reset Next

The plates of a parallel-plate capacitor are maintained with a constant voltage by a battery as they are pushed together, without touching. How is the amount of charge on the plates affected during this process? a.

Which of the following creates a longitudinal wave? A. striking a gong B. turning on a flashlight C. shaking a rope up and down D. dropping a stone into a pond