A train travels 84 kilometers in 1 hours, and then 85 kilometers in 3 hours. What is its average speed?

For inclined plane derive efficiency = L/h

What type of material is inside the holes in an electrical outlet?

Does sound increases when it's cold

Why was pluto recently reclassified as a dwarf planet? A. Pluto size had changed B. Scientists discovered the Pluto does no orbit the sun C. Scientists discovered other objects of a similar size in the solar system D.

What is the approximate terminal velocity of a sky diver before the parachute opens

Write two examples (mathematical expression) of physical laws that change inversely with the square of the distance.

What units must be used to express the temperature in the equation for the ideal gas law? explain?

Which region of the Sun is typically about 6,000 C?

How well does the infographic ""Plastics in the Ocean"" present a solution to the problem it describes?

Which of the following would be a good question that could be scientifically investigated? what is the best advice a parent can give a child what is the most appropriate number of dogs per household do cherry popsicles freeze slower than orange