200mg of uranium-238 has a half life of 4.5 billion years

How much will be left after 13.5 billion years

When steam condenses a. it changes from the gas phase to the liquid phase. b. it gives off heat. c. molecules move closer together. d. all of the above occur.

When you step on a roach, the roach applies an equal and opposite force on your foot as your foot applies to the roach (we don't advocate killing insects this way, especially if you are barefoot). Choose 1 answer: True False

Which of the following situations is an example of change in momentum? a. a tennis ball hit into a net b. a helium ballon rising up into the sky c. an airplane flying through scattered clouds

How is the Earth's magnetic field like a bar magnet's magnetic field?

What volume would 90 g occupy

To calculate the ideal mechanical advantage of a lever divide the input arm by the

An ionic compound is a compound that consists of molecules made of atoms that are covalently bonded. True or False?

What is the term for the flow of electric charge

Relation between wavelength wave velocity and time period

Infer how distance and speed in the motions of a clock parts are used to measure time