Which of the following are car safety features that rely on increasing the time of a crash? *
seat belts
crumple zones
air bags
all of the above

Examine the equation. 23490th→23088ra+42he what kind of barrier would you need to block the radioactive particles from this reaction? a. a piece of paper b. a sheet of aluminum foil c. a two-inch block of lead d. a solid concrete block

If we relied solely on the nonrenewable resources found in the u. s., which one would we run out of first at current usage levels? a. natural gas b. oil c. uranium d. coal

In the cores of extremely hot red giants, nuclear reactions convert helium to