Answer:
True
Explanation:
Because in atom the negative charge become lose or gain.
Answer:
Probably competition with television news-
by 1953 television was becoming common in many houses and people could obtain news from television newscasts
Answer:
The speed of the flow of water in the river is 4 m/s.
Explanation:
Given that,
Speed of man = 5 m/s
If this man swims crosses a specific river his speed is 3 m/s.
If he takes the minimum time to cross the river
Let the speed of flow of water be ![v_{r}](https://tex.z-dn.net/?f=v_%7Br%7D)
We need to calculate the speed of the flow of water in the river
Using formula for velocity
![v_{rs}^2=v_{r}^2+v_{s}^2](https://tex.z-dn.net/?f=v_%7Brs%7D%5E2%3Dv_%7Br%7D%5E2%2Bv_%7Bs%7D%5E2)
![v_{r}^2=v_{rs}^2-v_{s}^2](https://tex.z-dn.net/?f=v_%7Br%7D%5E2%3Dv_%7Brs%7D%5E2-v_%7Bs%7D%5E2)
Where,
= velocity of swimmer
= relative velocity
= velocity of river
Put the value into the formula
![v_{r}^2=5^2-3^2}](https://tex.z-dn.net/?f=v_%7Br%7D%5E2%3D5%5E2-3%5E2%7D)
![v_{r}=\sqrt{5^2-3^2}](https://tex.z-dn.net/?f=v_%7Br%7D%3D%5Csqrt%7B5%5E2-3%5E2%7D)
![v_{r}=4\ m/s](https://tex.z-dn.net/?f=v_%7Br%7D%3D4%5C%20m%2Fs)
Hence, The speed of the flow of water in the river is 4 m/s.
Image distance (Di) = 17 cm
Object distance (Do) = 36 cm
Using mirror equation,
1/Di + 1/Do = 1/f
1/17 + 1/36 = 1/f
0.058824 + 0.027777 = 1/f
1/f = 0.086601
f= 11.5472 = 11.55 cm
Answer:
<em>The velocity of the ball as it hit the ground = 19.799 m/s</em>
Explanation:
Velocity: Velocity of a body can be defined as the rate of change of displacement of the body. The S.I unit of velocity is m/s. velocity is expressed in one of newtons equation of motion, and is given below.
v² = u² + 2gs.......................... Equation 1
Where v = the final velocity of the ball, g = acceleration due to gravity, s = the height of the ball
<em>Given: s = 20 m, u = 0 m/s</em>
<em>Constant: g = 9.8 m/s²</em>
<em>Substituting these values into equation 1,</em>
<em>v² = 0 + 2×9.8×20</em>
<em>v² = 392</em>
<em>v = √392</em>
<em>v = 19.799 m/s.</em>
<em>Therefore the velocity of the ball as it hit the ground = 19.799 m/s</em>