What is work a product of? force and heat energy
buoyancy and heat energy
force and distance
cause and effect

What surface does the epithelial tissue cover? a. the surface of the body b. lines internal organs c. forms many glands d. all of the above

1. study the scenario. the particles in some system are moving around quickly. a few minutes later, the particles are moving, on average, more slowly. how does this change in motion affect the temperature of the system? the temperature of the system did not change. the speed of the particles does not affect temperature, the number of particles affects the temperature. the temperature of the system is lower now than it was initially. faster moving particles result in a higher temperature for the system. the temperature of the system is higher now than it was initially. slower moving particles result in a higher temperature for the system. the temperature of the system did not change. the speed of the particles has no effect on the temperature, only the type of atom affects the temperature.

A50.0 mg sample of an unknown radioactive substance was placed in storage and its mass measured periodically. after 19.7 days, the amount of radioactive substance had decreased to 3.13 mg. what is the half-life of the unknown radioactive substance?