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Physics, 21.06.2019 15:00
An ambulance emits a frequency of 450 hz from its siren. what frequency is heard by a man as the ambulance moves toward him? less than 450 hz more than 450 hz 450 hz 0 hz
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In a system, when potential energy decreases, then entropy also decreases. true false
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Physics, 22.06.2019 06:30
If an atom contains 11 protons in its nucleus, predict the element with the atomic number and electronic configuration. will the number of electrons remain the same during the chemical reaction in such an atom? explain.
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Physics, 22.06.2019 17:20
Properties seen when one one substance changes to another are known as properties
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Two objects attract each other gravitationally with a force of 2.5×10−10 n when they are 0.25 m apar...
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