A freight train rolls along a track with considerable momentum. If it rolls at the same speed but hastwice as much mass, its momentum isa. zero. b. doubled. c. quadrupled. d. unchanged.

What determines the force of gravity

Why is it difficult to walk on muddy road?

Describe how air particles differ in the way they move when air begins to cool.

If you drop a bowling ball, a tennis ball, and a feather from the top of a tall building at the same time which one will hit the ground first? (in the absence of air resistance) A. the bowling ball B. the tennis ball C. the feather D.

Astronomers are getting information about dark energy from a the existence of dark matter b the number of stars in the sky c the fact that gases are in galaxies d the shape of galaxies in cluster galaxies

Explain the relationship between speed, velocity and acceleration

What are the characteristics of prokaryotes? A.) A prokaryote lacks a well-defined nucleus. B.) A prokaryote cannot perform basic life functions. C.) A prokaryote lacks cell organelles. D.) A prokaryote is larger than a eukaryote.

In a perfectly inelastic collision, the total momentum of the system ___ (i) ___ constant, while the total kinetic energy of the system___ (ii) ___constant.

What factors determine power

Superman, with a mass of 150kg, goes into outer space to push a 125000kg alien spaceship out of stationary orbit. He uses his super strength and pushes the ship away ay at speed of 150m/s. What is the speed of Superman after his big push