Physics, 06.06.2020 22:59, Dragon63770
A 4 kW vacuum cleaner is powered by an electric motor whose efficiency is 90%. (Note that the electric motor delivers 4 W of net mechanical power to the fan of the cleaner). What is rate at which this vacuum cleaner supplies energy to the room when running
Answers: 1
Physics, 22.06.2019 13:00, chie42
Which of the following correctly describes what happens when an atomic bomb explodes? small pieces of fissionable material are joined and form a body with a mass greater than the critical mass, the relative number of neutrons escaping decreases, and a chain reaction and explosion result. large pieces of fissionable matter are brought together quickly and form a body with a mass smaller than the critical mass, the relative number of escaping neutrons increases, and a chain reaction and explosion result.
Answers: 2
Physics, 22.06.2019 15:30, anonymous1813
What is the increase in density of a medium due to wave travel?
Answers: 2
Physics, 22.06.2019 15:50, showerofstars
How many neutrons does plutonium -196 with an atomic number of 78.
Answers: 3
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