1. When a star collapses to form a black hole, its mass

a. decreases

b. remains the same

Antonio wants to replace the lightbulbs in his house. How much money would he save in one year by replacing 10 incandescent bulbs with 10 CFL bulbs? incandescent$1.47 per bulb CFL $3.99 annual operating cost incandescent $32.86 CFL $7.67

Whats the distance between earth and the sun

In the graph, a sample of water is heated from 40 degrees Celsius to 100 degrees Celsius. Which statement correctly describes the curve?

Frank just graduated from eighth grade. Assuming exactly four years from now he will graduate from high school how many seconds does he have until his high school graduation

Which selection is a characteristic of both living and nonliving things

Why should scientists write reports and give oral presentations of the steps and results of their in investigations?

Which of these rocks are formed by volcanic activity? select the two correct answers. a. marble b. basalt c. limestone d. granite e. sandstone

Which source is most likely an authority on the subject? Dr. Vale, a pediatrician, discusses electrical circuitry on her home-improvement website. Jonah, an amateur cook, teaches his son how to make the best grilled cheese sandwiches.

What methods can be used to break down substances into elements

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.