All of the following statements are true of the water cycles except:
a. runoff occurs when excess water flows across the surface. this water can carry contaminants into rivers, lakes, and oceans.
b. water in reservoirs are used in households, industry, and agriculture. the largest reservoir is lake mead on the colorado river.
c. the oceans contain about 97.25% of all of the water on the planet.
d. once water vapor becomes liquid it will never be vapor again.

If an astronaut takes an object to the moon the following is true (choose only one). a the mass will change but the weight will be the same. b both the mass and the weight of the object will be the same. c the weight will change but the mass will be the same. d both the mass and the weight of the object will change.

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.

How long will it take a car traveling of a constant speed of 45m/s to cover the distance of a 2.5km?