How are concentration and chemical reaction rate related?
a. lower concentrations can lead to faster reactions.
b. higher concentrations can lead to faster reactions.
c. concentration has an unpredictable effect on reaction rate.

**urgent** roberto plans to use two transformers to reduce a voltage of 120 v to 4 v. he uses a transformer that has 300 coils in the primary winding and 50 coils in the secondary winding. he has four other transformers, as listed in the table. which transformer should roberto use to have an ending voltage of 4 v? a- w b-xc- yd- z

Considering only the earth's rotation, determine how much later the asteroid would have had to arrive to put the explosion above helsinki at longitude 25˚ e? this would have obliterated the city.

If two parallel light rays hit a mirror, they will not be parallel to each other after they reflect.