Describing the motion of an object can be difficult to do and using graphs make motion easier to understand. motion is a change in position measured by distance and time. speed tells us the rate at which an object moves. speed graphs are distance-time graphs; sometimes people label them as position-time graphs as well. time is plotted on the x-axis and distance or position on the y-axis of a line graph. a distance-time graph tells us how far an object has moved with time. • the steeper the graph, the faster the motion. • a horizontal line means the object is not changing its position. it is not moving, and it is at rest. • a downward sloping line means the object is returning to the start. use the text and the graphs above to choose all of the correct answers concerning speed? in both graphs, speed will be measured in meters/second. in graph a, the object travelled a distance of 40 meters in 4 seconds the total distance travelled by the object in graph b is greater than the object in graph a. in graph b, the object is at rest for 5 seconds. the object in graph b was moving at a greater speed than the object in graph a

Explanation:

1. In both graphs, speed is measured in meters/ second. The time measured in seconds is plotted on the X-axis while the distance measured in meters is plotted on the Y-axis.

2. Looking at the graph, you could identify the distance of 40 meters on the Y-axis and trace it down to time at 4 seconds on the X-axis.

3. The total distance travelled by the object in graph A is greater than the total distance travelled by the object in graph B. Graph B has a total distance of 25 m while graph A has a total distance of 50 m.

4. In graph B, the object is at rest at 5 seconds. From 5 seconds, it maintained a horizontal line indicating that it was static.

5. Graph A was moving at a greater speed than Graph B. Graph A had a speed of 10 m/s while Graph B had a speed of 5 m/s.

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-first use of geothermal energy occurred more than 10,000 years ago in north america by american paleo-indians

-the first industrial use of geothermal energy began near pisa, italy in late 18th century

-in 1904, italian scientist piero ginori conti invented the first geothermal electric power plant in which steam was used to generate the power

-with the above experiment, the first geothermal plant in usa started in 1922 with a capacity of 250 kilowatts

-however, in 1946 first ground-source geothermal heat pump installed at commonwealth building in portland, oregon

-during the 1960’s, pacific gas and electric began operation of first large scale geothermal power plant in san francisco, producing 11 megawatts

-in 1973, when oil crisis began many countries began looking for renewable energy sources and by 1980’s geothermal heat pumps (ghp) started gaining popularity in order to reduce heating and cooling costs

-as effect of climate change started showing results, governments of various countries joined hands to fight against it, for which kyoto protocol was signed in japan in 1997, laid out emission targets for rich countries and required that they transfer funds and technology to developing countries, 184 countries have ratified it

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