baseball is thrown from center field to second base and its velocity changes from 15m/s to 10m/s. s mass is 150g, how much energy was lost due to air resistance (in J)? A) 9.4 B) 14.2 Ci8.3 A small object of mass m slides along the frictionless track in the figure, staring from rest at point D) 16.9 E) 6.2 What is its speed (in m/s) at point B? A) 10.8 B) 7.7 C) 12.3 D) 16.9 E) 8.9 A B 9m 5m 10) A 2000kg car and a 1000kg car traveling at 60m/s in opposite directions collide head on and lock together. What are their speeds after the collision (in m/s)? A) 9.4 B) 16.7 C) 14.3 D) 18.1 E) 20.0 11) A 800kg car moving at 20m/s hits a 1200kg parked car head on. How much mechanical energy is dissipated if collision is completely inelastic? A) 82000J B) 54000J C) 45000J D) 69000J E) 96000J 12) What is the mass of 0.6 mole of CO2 (in g)? A) 31 B) 7 C) 26 D) 18 E) 37 13) What is the volume of 8 moles of an ideal gas at p=latm and T=42°C? A) 0.069m B) 0.021m C) 0.207m D) 0.05m E) 0.570m 14) If a solute diffuses through water an average distance of 2cm in 2hours, what is its diffusion constant (in m2/s)? D) 0.6x106 E) 0.6x104
Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
physics, please solve question 13
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