An ideal gas is expanded isothermally from 20 L to 30 L. During this process, 6 J of energy is expended by the external mechanism that expanded the gas. Which of the following statements is correct?
A) 6 J of energy flow from surroundings into the gas.
B) 6 J of energy flow from the gas into the surroundings.
C) No energy flows into or from the gas since this process is isothermal.
D) None of the above statements is correct.
A
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A) slower. B) faster. C) the same.
Two masses are connected by a string which passes over pulley with negligible mass and friction. One mass hangs vertically and one mass slides on a 30.0 degrees frictionless incline. The vertically hanging mass is 4.00 kg and the mass on the incline is 6.00 kg. The acceleration of the 4.00 kg mass is
A. 2.98 
B. 3.92
C. 5.75
D. 6.86
E. 7.84
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a. 97.0 ? b. 100 ? c. 4.00 ? d. 36.0 ?
A load of steel of mass 6000 kg rests on the flatbed of a truck. It is held in place by metal brackets that can exert a maximum horizontal force of 8000 N
When the truck is traveling 20.0 m/s, what is the minimum stopping distance if the load is not to slide forward into the cab?