if a distant star is 20 light years away how long wil it take us to travel there moving at the speed of light?

An electron is placed in a magnetic field that is directed along a z axis. The energy difference between parallel and antiparallel alignments of the z component of the electron's spin magnetic moment with is 7.50 * 10-25 J. What is the magnitude of?

A gas has an initial volume of 168 cm3 at a temperature of 255 K and a pressure of 1.6 atm. The pressure of the gas decreases to 1.3 atm, and the temperature of the gas increases to 285 K. What is the final volume of the gas?

A ray diagram is shown what does the letter x represent?

A toy roller coaster cart has a mass of 2kg. The track of the roller coaster has a semicircular valley with a radius of 1.2 meters.

How does a doppler radar work?

Blocks with masses of 3.0 kg, 4.0 kg, and 5.0 kg are lined up in a row on a frictionless table. All three are pushed forward by a 16 N force applied to the 3.0 kg block. How much force does the 4.0 kg block exert on the 5.0 kg block?

Objects falling through air experience a type of friction called a. terminal velocity. b. air resistance. c. inertia. d. rolling frictio

Between which pair of objects would the largest gravitational attraction be found

Which of these items are made of cells? Check all that apply

Which of the following is true about high-energy mechanical devices?