A 6500-kg helicopter accelerates upward at 0.60 m/s² while lifting a 1200-kg car. (a) What is the lift force exerted by the air on the rotors? (b) What is the tension in the cable (ignore its mass) that connects the car to the helicopter? a) The total mass that is accelerating at .60 m/s/s is […]
Why does a child in a wagon seem to fall backward when you give the wagon a sharp pull? If the acceleration of a body is zero, are no force acting on it? Why do you push harder on the pedals of a bicycle when first starting out than when moving with a constant speed? […]
1. A reaction by which ozone is destroyed in the stratosphere is O3(g) + O(g) ® 2 O2(g) The activation energy for ozone destruction is 17.1 kJ per mole of O3 consumed. Use standard enthalpies of formation from Table B of Appendix II to calculate the enthalpy change for this reaction. Is the reaction endothermic […]
1. The isomerization of methyl isonitrile (CH3NC) to acetonitrile (CH3CN) was studied in the gas phase at 215EC, and the following data were obtained. Time(s) [CH3NC](M) 0 0.0165 2000. 0.0110 5000. 0.00591 8000. 0.00314 Calculate the average rate of reaction, in M/s, for the time interval between each measurement. (1) First […]