How do collisions between molecules transfer energy from a system of reacting substances to its surroundings?
O A. They cause molecules to flow into the system from the
surroundings.
O B. They cause heat to flow from the system to the surroundings.
C. They cause the thermal energy of the surroundings to decrease.
D. They cause the potential energy of the system to increase.

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Consider a one meter long horizontal pipe with a constant 100 cm^2 cross sectional area. water flows rightward into the pipe at x = 0 with flow velocity 02m/sec at every point within the pipe intake area. at x=1, the rightward flow rate is 0.192 m/sec. assume the water is a conserved quantity in the pipe, so there must be a leak (a sink) somewhere in the pipe. 1. compute net volumetric flow of the source if the system to be in equilibrium. 2. now assume the pipe in the problem has no leaks. compute the net volumetric rate of change for the system.

What distance does a car travel as its speed changes from 0 to 20 m/s in 17 s at constant acceleration?