Babylon
India submerged bodies
Greek
Microscope
Answer:
v = 2.85 m/s
Explanation:
By the law of similarity of the triangle we can say
![\frac{height\: of\: man}{distance\: of \: man\: from \: spotlight} = \frac{height \:of \:image}{distance\: of \:wall\: from\: spotlight}](https://tex.z-dn.net/?f=%5Cfrac%7Bheight%5C%3A%20of%5C%3A%20man%7D%7Bdistance%5C%3A%20of%20%5C%3A%20man%5C%3A%20from%20%5C%3A%20spotlight%7D%20%3D%20%5Cfrac%7Bheight%20%5C%3Aof%20%5C%3Aimage%7D%7Bdistance%5C%3A%20of%20%5C%3Awall%5C%3A%20from%5C%3A%20spotlight%7D)
here we know that
height of man = 2 m
let the distance of man from spotlight = x
distance of wall from spotlight = 12 m
height of image is let say "y"
so we will have
![\frac{2}{x} = \frac{y}{12}](https://tex.z-dn.net/?f=%5Cfrac%7B2%7D%7Bx%7D%20%3D%20%5Cfrac%7By%7D%7B12%7D)
![y = \frac{24}{x}](https://tex.z-dn.net/?f=y%20%3D%20%5Cfrac%7B24%7D%7Bx%7D)
now we have
![\frac{dy}{dt} = \frac{24}{x^2}\frac{dx}{dt}](https://tex.z-dn.net/?f=%5Cfrac%7Bdy%7D%7Bdt%7D%20%3D%20%5Cfrac%7B24%7D%7Bx%5E2%7D%5Cfrac%7Bdx%7D%7Bdt%7D)
here we know
![\frac{dx}{dt} = speed = 1.9 m/s](https://tex.z-dn.net/?f=%5Cfrac%7Bdx%7D%7Bdt%7D%20%3D%20speed%20%3D%201.9%20m%2Fs)
x = 4 m
now we have
![\frac{dy}{dt} = \frac{24}{4^2}(1.9)](https://tex.z-dn.net/?f=%5Cfrac%7Bdy%7D%7Bdt%7D%20%3D%20%5Cfrac%7B24%7D%7B4%5E2%7D%281.9%29)
![v = 2.85 m/s](https://tex.z-dn.net/?f=v%20%3D%202.85%20m%2Fs)
First Law of Thermodynamics: Energy can be changed from one form to another, but it cannot be created or destroyed. The total amount of energy and matter in the Universe remains constant, merely changing from one form to another.
<h2>
Answer: Toward the center of the circle.</h2>
This situation is characteristic of the uniform circular motion , in which the movement of a body describes a circumference of a given radius with constant speed.
However, in this movement the velocity has a constant magnitude, but its direction varies continuously.
Let's say
is the velocity vector, whose direction is perpendicular to the radius
of the trajectory, therefore
the acceleration
is directed toward the center of the circumference.
Answer:
study of everything that helps to improve the home and the family
Explanation: