How is radiometric dating done? a. the ratio of the isotopes from two different elements is compared over time. b. the ratio of a natural isotope to a radioactively decaying isotope of the same element is compared over time. c. the ratio of two radioactive isotopes is compared over time. d. the ratio of two nondecaying isotopes is compared over time.

Aball tossed vertically upward from the ground next to a building passes the bottom of a window 1.8 s after being tossed and passes the top of the window 0.20 s later. the window is 2.0 m high from top to bottom. what was the ball's initial velocity? the unit vector j^ is directed upward. how far is the bottom of the window from the launch position? how high does the ball rise above the launch position?

*drag each tile to the correct location in the sequence* the table shows chronological events in the life of our sun, a medium-sized star. place the missing events into the correct rows of the table.

If 2 moles of co_2 at 2l and 500k are expanded reversibly to 20l, more work can be obtained from an adiabatic process than from an isothermal process. is the above statement true or false?