Un corp avea +5 e. După contactul cu un alt corp sarcina lui a devenit -5 e. Determinați sarcina celui de al doilea corp. A primit sau a cedat electroni corpul? Se dă: Formule : Calcule: Răspuns:

What do you think car designers do if the damage caused by a crash test is too severe?

Two loudspeakers, 5.5 m apart and facing each other, play identical sounds of the same frequency. you stand halfway between them, where there is a maximum of sound intensity. moving from this point toward one of the speakers, you encounter a minimum of sound intensity when you have moved 0.33 m . assume the speed of sound is 340 m/s.part a) what is the frequency of the sound? part b) if the frequency is then increased while you remain 0.21 m from the center, what is the first frequency for which that location will be a maximum of sound intensity? express your answer to two significant figures and include the appropriate units.

A15.75-g piece of iron absorbs 1086.75 joules of heat energy, and its temperature changes from 25°c to 175°c. what is the specific heat capacity of iron?