The process shown in this diagram contributed great amounts of heat to the young planet Earth and is best known as radioactive

A) decay.

B) fission.

C) fusion.

D) isotope.

4x + 7y = - 23 8x + 5y = - 1

Read "Solar Basics" on the Energy Kids website. Specifically, read text under "Two limitations of solar energy". Use the information to answer the question. What factors affect the amount of solar energy that reaches the Earth's surface?

Which object has a varying speed? a bird flying at 10 m/s for 10 seconds a car slowing from 60 m/s to 0 m/s a car traveling the speed limit a fish moving at 2 m/s for 5 minutes

Two lightbulbs each with a resistance of 20 Ω are connected in series to a voltage of 120 V. If a third lightbulb of 20 Ω is added to the circuit, how will the current change? A. It will remain the same. B. It will increase from 40 A to 60 A. C.

What is the change in internal energy if 50 J of heat are released from a system, and the system does 80 J of work on its surroundings?

a submarine moving directly upward in the water at constant speed. The weight of the summer and it is 500,000 N. The submarines motors are off. The magnitude of the buoyant force acting on the submarine is

If the car went 30 km west in 25 min. and then 40 km east in 35 min., what would be its total displacement?

Which of the following is not the name of a space station that was in orbit around Earth?

Relationship between acceleration and free fall

A SI unit used to measure force, equal to less than one-quarter of a pound, is the what