Before a star is born, the matter that will become the star exists as a

A bright, explosive supernova

Bred giant

C black hole

D cool, dark nebula

What material is rare in the atmosphere of earth, but common in the atmospheres of mars and venus?

Student A: As the skater moves along the track, some of her kinetic energy is converted to thermal energy, so she will lose energy, causing the total energy of the system to decrease.

What does a kidney do

Stormwater is described as

How Do You Appreciate the role of spherical mirrors in daily life?

8. A gas is contained in a horizontal piston-cylinder apparatus at a pressure of 350 kPa and a volume of 0.02 m3. Determine the work done by the piston on the gas if the cylinder volume is increased to 0.15 m3 through heating.

A 75.0 kg person stands on a scale in an elevator. (a) What does the scale read (in N and in kg) when the elevator is at rest?

The hinge at A and cable BDC support beam ABC. Cable BDC passes over the pulley D that is pinned to the ceiling. (Assume that the + x-axis is to the right and the + y-axis is up along the page.

The "zone of avoidance" a) Accounts for the absence of any planet between the orbits of Mars and Jupiter Prevents collisions between planets in the Solar System.

Electric current is ...