What do peaked roofs, convertible tops, and airplane wings have in common when air moves faster across their top surfaces?

What produces light and all other electromagnetic waves? a) the photoelectric phenomena b) heated metals c) charged particles d) radioactive samples (pls explain if you can : )

What is the acceleration of a spaceship that is initially at rest and then speeds up to 220 m/s in 20 seconds

Apatient has a history of poor nutrition. he has skin rashes, bleeding gums, and a cut that hasn’t healed in a long time. what vitamin deficiency most likely caused this symptom?