Sound waves must have intensity if a person is to hear them.

a. True

b. False

How many species go extinct every day?

What is the acceleration of gravity?

What is earth's average distance from the sun called? a. a parsec b. a major axis c. a light-year d. an astronomical unit

A gas heated to millions of degrees would emit

How much current flows through a resistor of 285 ohms if the potential difference across the resistor is 122 volts?

Why is it useful to calculate average speed?

Which describes freefall

Suppose you were examining a pulsing radio signal from a stellar remnant in a distant part of the Milky Way.

Which pair of properties do all liquids have? A) Fixed volume; no definite shape B) Conducts electricity well; compressible C) Compressible; brittle D) Good conductor of heat; takes shape of container

0.2000 kg of water at 20.00°C is contained in a 0.1000-kg copper container. The container is shaken vigorously for 10.00 minutes to cause the temperature to rise to 22.00°C. Calculate the work done on the system and the heat supplied to the system.