Pedro thinks that if he adds earthworms to a compost pile, it will decompose twice as fast as a compost pile without earthworms. pedro has designed an experiment to test his prediction. the steps of his experiment are shown below.

step 1. start two compost piles at the same time with the same materials.

step 2. add earthworms to one compost pile.

step 3. add fungi to the other compost pile.

step 4. judge the level of decomposition in each compost pile every week.

report the results.
which step in pedro's experiment would make it difficult for pedro to fairly compare the two compost piles?
a.
step 3
b.
step 1
c.
step 4
d.
step 2
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True or false a high force means an object is moving fast100 points!

Na food processing facility, a spherical container of inner radius r1 5 40 cm, outer radius r2 5 41 cm, and ther- mal conductivity k 5 1.5 w/m · k is used to store hot water and to keep it at 100°c at all times. to accomplish this, the outer surface of the container is wrapped with a 800-w electric strip heater and then insulated. the temperature of the inner surface of the container is observed to be nearly 120°c at all times. as- suming 10 percent of the heat generated in the heater is lost through the insulation, (a) express the differential equation and the boundary conditions for steady one-dimensional heat conduction through the container, (b) obtain a relation for the variation of temperature in the container material by solving the differential equation, and (c) evaluate the outer surface tempera- ture of the container. also determine how much water at 100°c this tank can supply steadily if the cold water enters at 20°c.

Consider two metallic rods mounted on insulated supports. one is neutral, the other positively charged. you bring the two rods close to each, but without contact, and briefly ground the the neutral rod by touching it with your hand. show answer correct answer what would be resulting charge (if any) on the initially neutral rod