Abird can fly 25 km/h how long does it take to fly 3.5km

In which of these cases are the two wave points considered to be in phase with each other?

Listed following are various physical situations that describe how light interacts with matter. match these to the appropriate category. 1) transmission? -visible light meets clear glass -visible light does not pass through a black wall -red light hits a red sweatshirt -light comes from your computer screen -cell phone signals pass through walls -blue light hits a red sweatshirt -white light hits a white piece of paper -light comes from a light bulb

How does the strength of the electrostatic force between an electron and a proton compare to the strength of the gravitational force between them?