Which of the following is an example of convection?

A. hot air rising and cooler air falling

B. a hot object transferring heat to a cooler one

C. a hot oven warming the air around it

D. the rays of the Sun warming the earth

Why is water always used in energy generation (water - > steam - > turbine) instead of a liquid with a lower specific heat capacity or boiling?

Explain how a reduction in the amount of sunlight in an ocean ecosystem could cause greater competition among the consumers.

For parallel and series circuits with the same resistances and voltage; the series circuit has a smaller total current. True or false?

A coil of wire that is carrying a current and produces a magnetic field is a. a galvanometer. b. a solenoid. c. a magnetic domain. d. an electric motor.

Are chemical reactions necessary in life

Heliocentric means ... sun-centered. moon-centered. Earth-centered. galaxy-centered.

Which of the following statements are true? a. A satellite's motion is independent of its mass. b. A satellite's velocity and orbital radius are independent of each other. c. A geosynchronous satellite has a period of approximately 28 days. d.

Latent heat of vaporization refers to which changes of state? liquid to gas or gas to liquid solid to gas or gas to solid solid to liquid or gas to liquid gas to liquid or liquid to solid

In what part of the scientific method do you record data? a. Conclusion b. Experiment c. Analysis d. Hypothesis

What is the basic definition of a black hole? a. any compact mass that emits no light b. a dead star that has faded from view any object from which the escape velocity exceeds c. the speed of light any object made from dark matter d.