Amotorcyclist is traveling north on a road at a speed of 25.0 m/s. a police car, traveling south at a speed of 40.0 m/s, approaches with its siren producing sound at a freqency of 2600 hz. (enter your answers in hz. assume that the speed of sound in air is 313 m/s.) (a) what frequency does the motorcyclist observe as the police car approaches? (enter your answer to the nearest integer.) hz (b) what frequency does the motorcyclist detect after the police car passes her? hz(c) repeal parts (a) and (b) for the case when the police car is traveling northbound while police car overtakes hz after police car passes hz ?

Jackson is designing a new heater, and he wants to experiment with different thermally conductive materials. which of these materials would be useful in conducting heat?

Did the proton move into a region of higher potential or lower potential? did the proton move into a region of higher potential or lower potential? because the proton is a negative charge and it accelerates as it travels, it must be moving from a region of higher potential to a region of lower potential. because the proton is a negative charge and it accelerates as it travels, it must be moving from a region of lower potential to a region of higher potential. because the proton is a positive charge and it slows down as it travels, it must be moving from a region of higher potential to a region of lower potential. because the proton is a positive charge and it slows down as it travels, it must be moving from a region of lower potential to a region of higher potential. request answerpart bwhat was the potential difference that stopped the proton? express your answer with the appropriate units.î”v î” v = nothingnothingrequest answerpart cwhat was the initial kinetic energy of the proton, in electron volts? express your answer in electron volts. ki k i = nothing ev request answerprovide feedback

10 newton object is placed 3 meters from the fulcrum. at what distance on the other side would you need to place a 15 newton object to balance the lever? show your work!