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The energy of the first excited state of a hydrogen atom is -0.34 eV ± 0.0003 eV. What is the average lifetime of for this state?
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a 30kg child wants to use a 20kg board that is 6.0m long as a seesaw. since all her friends are busy, How far from her will the support be
A hollow cylindrical conductor has an inner radius a= 1 cm and an outer radius b= 2.6 cm. The total current during the cylinder is 15 A. Using Ampere's Law, Compute the magnetic field at
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A spring is hanging from the ceiling. Attaching a 700 physics book to the spring causes it to stretch 27 in order to come to equilibrium. Spring constant 25 N/m: -From equilibrium, the book is pulled down 10cm and released. What is the period of osci..
The rms speed of a sample gas is increased by 2.0 %. What is the percent change in the temperature of the gas
The enthalpy of the reaction is 22.4 kj/mol CO and the entropy of the reaction is 39.6 kj/K mol CO for a standard state (consisting of 1 weight percent of Oxygen and 1 weight percent of Carbon in steel).
The baseball's kinetic energy is 1/2 × 0.15kg ×(24.6ms-1)2 = 45.4J. The kinetic energy of the bowling ball is 1513J. That of the automobile is 0.454MJ.
A research group plans to construct an engine that extracts energyfrom the ocean, what is the maximum efficiency such anengine could have
Calculate the change in internal energy for each of the following systems: 100 joules of energy is added to a system that does 40 joules of external work
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