Agirl rolls a marble across the floor and determines the distance rolled (in meters) every second for 10 seconds. what is the average speed of the marble as it rolls across the floor? a. 0 m/sb. 0.67 m/sc. 1.5 m/sd. 150 m/s

The average speed of the marble as it rolls across the floor is 1.5 m/s.

Average speed is the ratio of total distance travelled to total time taken. It is given by:

Average speed = total distance / total time

The average speed of the marble can be gotten by finding the slope of the graph. The graph passes through (0, 0) and (6, 9).

The slope is:

The average speed of the marble as it rolls across the floor is 1.5 m/s.

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Average speed during some time interval =  

(distance traveled during the time) / (length of the time) .

According to the graph, the marble traveled 15 meters in 10 seconds.

Average speed = (15 m) / (10 s)

Average speed = 1.5 m/s during that 10 sec.  

We also know that the speed at any point in time is the slope of the graph at that point in time.  Since the graph is a straight line, it has the same slope at every point.  So the speed of the marble is 1.5 m/s at every instant during the 10 second interval.

most voltage drop calculators want the distance between the source and destination. then internally, they double it so both the source and return wires are calculated. but you need to know which distance the calculator uses so you're not half of what you should be or double what you should be.

most circuit breakers will not take a #6 directly, so the electrician will have to splice on a smaller pigtail. you also have to upsize the grounding wire when you upsized the ungrounded (hot) wire (see note in 250.122). this will preclude using most cable assemblies, as a cable with #6 copper will most likely only have a #10 grounding conductor. you need a #6 grounding conductor if the circuit is 20a. a #8 cable is no better, as it will have a #10 grounding conductor too. but most 20a breakers will take a #8 directly.

in your related post, you didn't say what type of load this is. if it is a light or heater, voltage drop won't be a big issue. if this is a motor, the current needs are huge at startup and the voltage drop can pose a problem. if this is a motor, knowing if the motor is under much load during startup will answer the voltage drop effect (a saw is easier to start than a compressor).

well, you would divide 135 by 33 to get your answer. then that is how many seconds it would take. boardman should fly about 132 m or 4.090909090909091 seconds.