Helium is less than the elements that make up the air we breathe, so a balloon filled with helium will float in air.

What is the average speed of an object that travels at a constant speed of 50 m/s?

Determine the magnitude of the effective value of g⃗ at a latitude of 60 ∘ on the earth. assume the earth is a rotating sphere.

Which is not an area where the maritime tropical air masses that affect north america originate?

A worker is pushing a box of mass M up a rough incline by applying a horizontal pushing force of constant magnitude P.

How far away is mars from the sun. why is is red?

If a 2,300 kg car is accelerating at 16 m/s^2, what is the force it is producing?

A hollow sphere of negligible mass and radius R is completely filled with a liquid so that its density is rho. You now enlarge the sphere so its radius is 2R and completely fill it with the same liquid. What is the density of the enlarged sphere?

what is the average speed of a person who can run around the track 4 times in 5 minutes? the track is 400 meters long.

A planet with a mass of 3.0 x 1023kg orbits 6.0 x 1010m from a star with a period of 3.4 x 1011seconds. Determine the mass of the star.

Humans obtain energy in a number of different ways. About half of the electrical energy in the U. S. is generated by burning coal, largely because coal is very inexpensive.