Which "sphere" does an astronomer most directly study?

a. biosphere

b. exosphere

c. geosphere

d. cryosphere E. atmosphere F. hydrosphere

What is the name of newton's first law of motion? a. law of inertia b. law of acceleration c. law of objects at rest d. law of opposing forces

Formula that will find density

A plane flies toward a stationary siren at 1/4 the speed of sound. Then the plane stands still on the ground and the siren is driven toward it at 1/4 the speed of sound.

A swimmer heading directly through a 200m wide river reaches the opposite shore in 6 min 40s. She is washed downstream 480 m. How fast can you swim in calm water?

What is ozone and why is it important?

What is a parallelogram

If the force exerted by a canon on a cannonball is equal to the force exerted by a cannonball on a canon why does the cannonball move so much farther than the canon?

A teacher gives students four liquids commonly found in the kitchen - vinegar, apple juice, dish detergent, and milk - and pH indicator strips, which measure acidity.

What are geothermal heat pumps used for? a. Cooling and heating buildings b. Cooling buildings c. Heating buildings d. Heating water for using in homes

Electromagnetic waves have linear momentum as well as energy. What does this imply about electromagnetic waves?