The diagram is missing; however, we know that the intensity of a sound wave is inversely proportional to the square of the distance from the source:
where I is the intensity and r is the distance from the source.
We can assume for instance that the initial distance from the source is r=1 m, so that we put
The intensity at r=3 m will be
Therefore, the sound intensity has decreased by a factor
.
Answer:
Part a)
Part b)
Part c)
Part d)
Part e)
Part f)
Part g)
Part h)
Explanation:
Part a)
Torque due to F1 force is given as
Part b)
Torque due to F2 force is given as
Part c)
Torque due to F3 force is given as
Part d)
Net torque along x direction is given as
Part e)
Net torque along y direction is given as
Part f)
Net torque along x direction is given as
Part g)
angular acceleration is given as
now we have
Part h)
angular speed of the disc after 1.5 s
now rotational kinetic energy is given as
Answer: Decreases the transparency of the atmosphere to infrared light.
Explanation: Green House gases are gases such as Carbondioxide,Methane,Water Vapor etc which are present in the Atmosphere,they trap and emit heat in the form of radiations. Green house gases act like a barrier preventing some of the radiations especially of the IR(INFRA-RED) to leave the Earth,which eventually leads to increase in the overall Temperature of the Earth.
The higher the concentration of the Green house gases,the lesser the transparency of the Atmosphere to the Infrared radiation.