Answer:
Thus, the payback time for cavity wall insulation is 7.5 years
The ozone layer traps heat from the sun's heat. only three-fourths are reflected back out into space by the ozone layer. the greenhouse effect traps carbon dioxide and so does the ozone layer.
Answer:
Speed is a "scalar" quantity
(C) is the correct answer
An object could travel at 10 m/s to some point and then return to the origin at 10 m/s for an average speed of 10 m/s, however it's displacement over that time would be zero for a net velocity of zero.
Answer:
Explanation:
In order to find its centripetal acceleration we need to use the next equation:
So, we need to find its velocity in first place. Considering that the time T required for one complete revolution is called the period. For constant speed is given by:
Solving for v, considering that in this case T=1.3min=78s, and r=242
Finally, replacing v in the centripetal acceleration equation: