Which of the following gases is the heaviest?

O2

CH4

CO2

Cl2

A pulley system operates with 40% efficiency. if the work put in is 200 joules, how much useful work is produced?

Jupiter contains a number of small moons that are thought to be captured comets or material ejected by collisions with larger objects. what is the evidence for this theory?

A small pool filled only with water will require an additional 300 gallons of water in order to be filled to 80% of its capacity.

Is NaCH an element? Why or why not?

How are observation and inference different

A SI unit used to measure force, equal to less than one-quarter of a pound, is the what

What basic form of energy is present in blowing wind?

A wave with a frequency of 30 Hz has a wavelength of 40.5 m. How fast is the wave traveling?

A soccer ball is sitting in the middle of a soccer field during a game. When the referee blows his whistle, one of the players runs toward the ball and kicks it as hard as he can.

A body with v=20m/s changes its speed to 28m/s in 2sec. its acceleration will be