A train travels 140 km in 2 hours and 30 minutes. What is its average speed?

Fluorine is the most reactive element in the halogen family

How long would it take the Earth to complete 4 orbits around the Sun?

Conduction occurs when thermal energy is transferred by the movement of A waves B molecules C liquids D fluids

Fission: can produce krypton, strontium, barium, and xenon is the type of nuclear reaction that occurs in stars takes two small atoms and fuses them together to create a larger atom only produces a minimal amount of radioactive waste

Which of the following is true about the gibbous moon? A. All of its lit surface can be seen. B. More than half of its lit surface can be seen. C. Less than half of its lit surface can be seen. D. None of its lit surface can be seen.

Contrast balanced and unbalanced forces.

A wave will travel only as long as it has energy

a box sliding on a frictionless surface when it suddenly begins to rain heavily. if the downpour of rainfall falls vertically into the box, gradually filling it, what would happen to the speed of the box

Which would fall with a greater acceleration in a vacuum-a leaf or a stone?

A force acts on a 5kg object at rest. How fast will the object accelerate on a frictionless surface? A.) 4 m/s^2 B.) 15 m/s^2 C.) 25 m/s^2 D.) 100 m/s^2