Which gives you a frame of reference for your speed when you are riding a train?

the wheels of the train

the sky overhead

the train track

the station

True or false:In free fall the object with less air resistance falls with a greater acceleration

1. why does the sun have the greatest amount of gravity in our solar system?

The average density of the outer "giant" planets compared with the density of liquid water is

An elevator of mass 3000 kg is ascending at a steady speed of 2.0 m/s. What is the force in the cable supporting the elevator?

Why is there a danger of explosion in places like coal mines where there are large quantities powdered, combustile material

Why does Alpha Centauri appear to be yellow-white?

In order to determine speed, you must know

Which of the statements best describes the relationship between the surface of an object and the amount of friction it produces? A.) The smoother the surface of an object, the more friction it will produce. B.

Laboratory measurements show hydrogen produces a spectral line at a wavelength of 486.1 nanometers (nm). A particular star's spectrum shows the same hydrogen line at a wavelength of 486.0 nm. What can we conclude

Esimate and add to the nearest thousand 6,521+1,063+901