Answer:
3.2 miles
Explanation:
We can assume that the light coming from the lightning reach instantaneously our eyes (because light travels very fast, ), so the time between the lightining and the hearing of the thunder is equal to the time that sound takes to each us.
Sound travels in air approximately at speed
v = 343 m/s
So the distance it covers in a time of t = 15 seconds is
And using the conversion from meters to miles,
1 mile = 1609 meters
we find
Answer:
force of attraction will be increased by 9
Explanation:
force of attraction is inversely proportional to square of distance
i.e F= 1/R²
F=1/3R²
F=1/9R
9×F= 9×1/9R
9F= 1/R
so force of attraction is 9 times
Energy
In electromagnetic waves, energy is transferred through vibrations of electric and magnetic fields. In sound waves, energy is transferred through vibration of air particles or particles of a solid through which the sound travels. In water waves, energy is transferred through the vibration of the water particles.
Here just look it up
In physics, energy is the property of an object which can be transferred to other objects or converted into different form, it also the ability of the system to perform work. To determine its total energy you must subtract its Kinetic Energy and it Potential Energy. I hope this helps
The forces of gravity between two objects are inversely proportional
to the square of the distance between them.
So the gravitational forces are stronger at closer distance, and weaker
at greater distance.
This is a big part of the reason why we are attracted more strongly to
the Earth than we are to Jupiter.