Fuel cells are devices that

A. directly convert hydrogen to electricity.

B. store solar energy.

C. spin turbines.

Which can be used to determine composition of a star

What are some examples of motion that has negative acceleration?

What do we call the combination of all food chains in a given ecosystem

Which characteristics are generally given to the atoms that make up a liquid?

What must be photographed with an impression before it is moved or cast? A) a scale B) an evidence card C) the likely object that made the impression D) the badge of the first officer at the scene

After creating a question and forming a hypothesis, what is the next step in the scientific method

Roger sees water balloons fall past his window. He notices that each balloon strikes the sidewalk 0.51 s after passing his window. Roger's room is on the second floor, 10 m above the sidewalk.

Which statements accurately describe the Doppler effect?

Describe how mass and distance affect gravitational force.

a bike can climb the inclined road at uniform speed of 72 km/hr by applying force 500N what will be the power applied by the bike?