Rhea is running towards Sean and kicks a soccer ball to him. Sean is standing still.
Which statement best describes the speed of the ball
from Sean's frame of reference and Rhea's frame of
reference?
O The speed of the ball from Sean's reference frame
would be greater than the speed of the ball from
Rhea's reference frame.
O The speed of the ball from Sean's reference frame
would be less than the speed of the ball from Rhea's
reference frame.
The speed of the ball from Sean's and Rhea's
reference frames would be 0 km/h.
O The speed of the ball from Sean's and Rhea's
reference frames would be less than 0 km/h.

O The speed of the ball from Sean's reference frame would be greater than the speed of the ball from Rhea's reference frame.

Explanation:

Say the ball is kicked at 10 m/s and Rhea is running 3 m/s

Sean would see the ball approach at 10 m/s and Rhea approach at 3 m/s

Rhea would see Sean approach at 3 m/s and the ball depart at 10 - 3 = 7 m/s

The ball would see Sean approach at 10 m/s and Rhea depart at 7 m/s

-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

hope this