Answer:
1.52 m
Explanation:
We are given that
Maximum force=F=679 N
Mass of rock ,m=385 kg
Distance,d=0.233 m
We have to find the minimum total length L of the rod required to move the rock.
Torque on rock=
Where 
Torque on man=




Hence, the minimum total length of rod=1.52 m
t = d/v = 510:340 = 1,5 secunde
1,4 secunde, deci
t2 = 1,5 - 1,4 = 0,1 secunde
v2 = distanta/timp = 510 metri / 0,1secunde
= <span>5100 metri / secunda</span>
<span>hope it helps</span>
Answer:
Waves: "The phenomenon in which any number of particles or the energy packets that originates from a transmitter travels in a direction and it is somehow directed towards a receiver end is called as waves."
Electromagnetic wave: The type of waves which do not require any sort of medium for the transformation process of the energy, as it is directed towards from a transmitter towards a receiver.
For example: Radio, IR , Ultra sonic waves etc.
Mechanical waves: The type of waves which requires some medium to transfer the energy packets from one place to another, or from one point to the other using some medium. As the medium can be solids,liquids, or any gaseous forms.
For example: Sound waves, seismic waves etc.
Explanation:
The transfer of energy in Mechanical waves and Electromagnetic waves:
Both, the waves are much different due ones basic requirement of a medium while the other don't require one. As the density of any medium if increased it will increase the speed of the wave propagation. And this any medium being more denser will result in high speed form mechanical waves.
While, the electromagnetic waves can pass through matters or elements easily with out having any obstruction faced in its path because presence of medium is no requirement for the wave propagation.
I hope this helps!!
here the charge density of metal plate is given as

now the electric field is given Gauss law

now here E = constant
so we will have

Since total area on both sides of plate will be double and becomes 2A



Now if we will find the electric field inside the metal plate
Then as we know that total charge inside the plate will always be zero
so we have

Answer:1.902 m
Explanation:
Given
height of apartment=1.5 m
It takes 0.21 sec to reach the bottom from apartment
So



i.e. if ball is dropped from top its velocity at window is 6.11 m/s
So height of upper floor above window

where s= height of upper floor above window
here u=0


s=1.902 m