A train travels 53 kilometers in 1 hours and then 81 kilometers in 3 hours what is its average speed?

Name two ways the properties of iron and oxygen are different from the compound iron oxide (rust).

You fill two balloons with gas, one with hydrogen and one with carbon dioxide. You hold a match to each balloon. The hydrogen balloon explodes in a small fireball. The carbon dioxide balloon pops where the match burns it, but nothing else happens.

A student stands on a bathroom scale in an elevator at rest on the 64th floor of a building. The scale reads 836 N. a) As the elevator moves up, the scale reading increases to 935 N, then decreases back to 836 N.

If you are reading a book and you move twice as far away from the light source, how does the brightness at the new distance compare with that at the old distance? It is

A 67.5-kg person throws a 0.0410-kg snowball forward with a ground speed of 34.0 m/s. A second person, with a mass of 57.5 kg, catches the snowball. Both people are on skates. The first person is initially moving forward with a speed of 3.

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

Formulas (equations) : A = 3x and B = 5x + 1 As x increases, does A or B go up faster? if x=0, then A=? if x=1 then B=?