Aliens slowing down to observe Earth often are distracted by lighthouses. As aliens pass Earth in their spaceship they notice a lighthouse completes its circuit once every 5.0 s, however the lighthouse attendant has set the lighthouse to complete its circuit every 4.1 s from his point of view. How fast is the alien spaceship traveling in terms of the speed of light

cell differentiation  is how generic embryonic  cells  become specialized  cells. this occurs  through a process called gene expression. gene expression is the specific combination of genes that are turned on or off (expressed or repressed), and this is what dictates how a  cell  functions.

explanation:

explanation:

newton's third law, for every action there is an equal and opposite reaction.

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.

wavelength divides in half and speed stays the same.