A basic observation of a star is how bright it appears. This brightness is known as the star's

A. luminosity.

B. absent magnitude.

C. apparent magnitude.

D. absolute magnitude.

A 0.299 kg mass slides on a frictionless floor with a speed of 1.44 m/s. The mass strikes and compresses a spring with a force constant of 44.9 N/m. How far does the mass travel after contacting the spring before it comes to rest?

Hypothesis: plants will grow more when the day is longer. what is the independent variable?

Freight trains can produce only relatively small acceleration and decelerations. (a) what is the final velocity (in m/s) of a freight train that accelerates at a rate of 0.0600 m/s2 for 8.00 min, starting with an initial velocity of 5.00 m/s?

Which statements accurately describe density? Check all that apply.

Which of the following statements is true? After one half-life, 75% of the original radionuclide will remain. After two half-lives, 50% of the original radionuclide will remain. After four half-lives, 12.5% of the original material will remain.

IF you are skateboarding and push back with one leg, and, as a result the skateboard moves forward. Which law of motion is being described

Explain why astronomers long ago believed that space must be filled with some kind of substance (the "aether") instead of the vacuum we know it is today.

Which of the following is an example of the electrostatic force acting in an atom? A. An electron repelling a proton B. A proton repelling another proton C. A neutron repelling an electron D. A neutron repelling another neutron

What are the correct units for energy and work

At the instant a current of 0.40 A is flowing through a coil of wire, the energy stored in its magnetic field is 9.5 ✕ 10-3 J. What is the self-inductance of the coil (in H) ?