A train travels 57 kilometers in 3 hours, and then 87 kilometers in 2 hours. What is its average speed? km/hr

A bicycle slows down when the rider applies the brakes. What type of energy transformation is involved in this example? A. kinetic energy into heat energy B. heat energy into potential energy C. potential energy into kinetic energy D.

What is the magnitude of the resultant force, in newtons, acting on an object that has two forces acting in the same direction having magnitudes of 15 newtons and 25 newtons and a third force acting perpendicular to the first two having a magnitude

A car moving at 20m/s slows down to 10 m/s find the change in kinetic energy

Define uniform and nonuniform motion. Write one example for each.

Compare the numbers of protons and electrons in a positive ion with the numbers of protons and electrons in a negative ion.

Which describes how radiation moves? radiation moves from a cooler object to a warmer object radiation moves from a warmer object to a cooler object radiation moves from a warm object to an object of the same temperature radiation moves from a cool

Why does the closed top of a convertible bulge when the car is riding along a highway? Why does the closed top of a convertible bulge when the car is riding along a highway? The air pressure is greater outside the car than inside.

Is a white shirt cooler or warmer in the sunlight?

A stone is thrown vertically upward with a speed of 18.0. (a) How fast is it moving when it reaches a height of 11.0? (b) How long is required to reach this height? For part A) I did: y=11m, g=9.

What object or class of objects makes up most of the solar systemâs mass?