Hard surfaces reflect sound back into the room, while carpets help to absorb the sound so it reflects less
Answer:
320 N/m
Explanation:
From Hooke's law, we deduce that
F=kx where F is applied force, k is spring constant and x is extension or compression of spring
Making k the subject of formula then
![k=\frac {F}{x}](https://tex.z-dn.net/?f=k%3D%5Cfrac%20%7BF%7D%7Bx%7D)
Conversion
1m equals to 100cm
Xm equals 25 cm
25/100=0.25 m
Substituting 80 N for F and 0.25m for x then
![k=\frac {80}{0.25}=320N/m](https://tex.z-dn.net/?f=k%3D%5Cfrac%20%7B80%7D%7B0.25%7D%3D320N%2Fm)
Therefore, the spring constant is equal to 320 N/m
Answer:
The image of everything in front of the mirror is reflected backward, retracing the path it traveled to get there. Nothing is switching left to right or up-down. Instead, it's being inverted front to back. ... That reflection represents the photons of light, bouncing back in the same direction from which they came
Explanation:
Answer:
![F=8.45\times 10^{-8}\ N](https://tex.z-dn.net/?f=F%3D8.45%5Ctimes%2010%5E%7B-8%7D%5C%20N)
Explanation:
Given that,
Mass of a boy is 78 kg
Mass of a girl is 65 kg
We need to find the force of gravitational attraction between them if they are 2 m away.
The formula for the gravitational force is given by :
![F=\dfrac{Gm_1m_2}{r^2}\\\\F=\dfrac{6.67\times 10^{-11}\times 78\times 65}{(2)^2}\\\\=8.45\times 10^{-8}\ N](https://tex.z-dn.net/?f=F%3D%5Cdfrac%7BGm_1m_2%7D%7Br%5E2%7D%5C%5C%5C%5CF%3D%5Cdfrac%7B6.67%5Ctimes%2010%5E%7B-11%7D%5Ctimes%2078%5Ctimes%2065%7D%7B%282%29%5E2%7D%5C%5C%5C%5C%3D8.45%5Ctimes%2010%5E%7B-8%7D%5C%20N)
So, the force between them is
.