Answer:
1.) Covering the ceiling and walls with soft perforated boards
2.) Hanging curtains round the hall
3.) Having more opening in the wall.
Explanation:
This is due to what we called Reverberation due to poor acoustic properties.
Reverberation can be reduced by;
1.) Covering the ceiling and walls with soft perforated boards
2.) Hanging curtains round the hall
3.) Having more opening in the wall.
P (momentum) = mass x velocity
p = .5 x 20
p = 10
In this way, heat inside Earth moves toward the cooler crust. This movement of rock is a COnvection Current<span>. </span>Convection Currents<span> in the mantle cause the movement of tectonic plates. Figure 4 </span>Convection currents in the atmosphere<span> form when cold </span>air<span>sinks and forces warm </span>air<span> away from Earth's surface.</span>
Turbine generators to produce electricity.
The displacement of the rock will be the same as the total horizontal distance traveled. Here the rock's horizontal position is given by
so to find the horizontal distance it traversed, we need to know the time it took for the rock to return to the ground. We use the rock's vertical position over time to figure that out:
where 
is the acceleration due to gravity. Then we find that 
, at which point we find 
.
