Explanation:
sound waves go through almost every thing exept solid walls
Answer:
probably the trip where it took u 5 seconds
The density of the body and the height or the depth of the body since the formula of liquid pressure is density x height gravity
Answer:
a) In order to catch the ball at the level at which it is thrown in the direction of motion.
b)Speed of the receiver will be 7.52m/s
Explanation:
Calculating range,R= Vo^2Sin2theta/g
R= (20^2×Sin(2×30)/9.8 = 35.35m
Let receiver be(R-20) = 35.35-20= 15.35m
The horizontal component of the ball is:
Vox= Vocostheta= 20× cos30°
Vox= 17.32m/s
Time taken to coverR=35.35m with 17.32m/s will be:
t=R/Vox= 35.35/17.32
t= 2.04seconds
b)Speed required to cover 15.35m at 2.04seconds
Vxreciever= d/t = 15.35/2.04 = 7.52m/s
Answer:
![L_0\approx1.0328\ m](https://tex.z-dn.net/?f=L_0%5Capprox1.0328%5C%20m)
Explanation:
Given:
- relativistic length of stick A,
![L=1\ m](https://tex.z-dn.net/?f=L%3D1%5C%20m)
- relativistic velocity of stick A with respect to observer,
![v=0.25c=7.5\times 10^{7}\ m.s^{-1}](https://tex.z-dn.net/?f=v%3D0.25c%3D7.5%5Ctimes%2010%5E%7B7%7D%5C%20m.s%5E%7B-1%7D)
<em>Since the object is moving with a velocity comparable to the velocity of light with respect to the observer therefore the length will appear shorter according to the theory of relativity.</em>
<u> Mathematical expression of the theory of relativity for length contraction:</u>
![L=\frac{L_0}{\gamma}](https://tex.z-dn.net/?f=L%3D%5Cfrac%7BL_0%7D%7B%5Cgamma%7D)
where:
L = relativistic length
original length at rest
Lorentz factor ![=\frac{1}{\sqrt{1-\frac{v^2}{c^2} } }](https://tex.z-dn.net/?f=%3D%5Cfrac%7B1%7D%7B%5Csqrt%7B1-%5Cfrac%7Bv%5E2%7D%7Bc%5E2%7D%20%7D%20%7D)
![\Rightarrow 1=\frac{L_0}{\frac{1}{\sqrt{1-\frac{(0.25c)^2}{c^2} } }}](https://tex.z-dn.net/?f=%5CRightarrow%201%3D%5Cfrac%7BL_0%7D%7B%5Cfrac%7B1%7D%7B%5Csqrt%7B1-%5Cfrac%7B%280.25c%29%5E2%7D%7Bc%5E2%7D%20%7D%20%7D%7D)
![L_0=\frac{1}{\sqrt{1-\frac{(0.25c)^2}{c^2} } }](https://tex.z-dn.net/?f=L_0%3D%5Cfrac%7B1%7D%7B%5Csqrt%7B1-%5Cfrac%7B%280.25c%29%5E2%7D%7Bc%5E2%7D%20%7D%20%7D)
![L_0\approx1.0328\ m](https://tex.z-dn.net/?f=L_0%5Capprox1.0328%5C%20m)