In going from the ground floor to the third floor of a building, a senior citizen used the main stairs to go to the second floor. In order to rest, he walked along the corridors of the second floor leading to a side stairs. He then used the side stairs to go to the third floor. Did the senior citizen do lesser work than continuously taking the stairs from the first to the third floor? Explain your answer.

If you want to change the pitch of a sound, you have to change the

Shelly experiences a backward jolt when the driver starts the school bus. which of the following explains this phenomenon? a. the inertia of shelly b. the inertia of the bus c. the normal force of the seats on shelly d. the net force acting on shelly in a backward direction e. a zero net force acting on shelly

Avehicle has an oil leak that is causing the entire oil pan to be wet, but inspection reveals no exact source after cleaning off the oil residue. technician a says to install a fluorescent dye in the crankcase and operate the engine, then re-inspect for leaks with a special light (black light). technician b says the oil leak may be coming from a source at the top of the engine, such as a valve cover gasket. who is correct?