In all ecosystems energy is eventually lost to the environment via

Describe the path of a ray that approaches a mirror parallel to the principal axis.

Could we see a galaxy that is 20 billion light-years away?

Acharge q experiences no net force at a particular point in space. which of the following situations described below must always be true? -there are no other charges nearby. -if there are other charges nearby, they must all have the same sign as q. -if there are other charges nearby, they must all have the opposite sign of q. -if there are other charges nearby, the total positive charge must equal the total negative charge. -none of the above