Answer:
The answer is A, the Law of Conservation of Matter.
Explanation:
Power is the rate of work or energy. It has units of Watts. For an electrical circuit, it can be calculated by multiplying the voltage and the current flowing. Ampere represents the amount of electricity while voltage represents the force of the electricity flowing. We calculate as follows:
P = IV
P = 1 A (5x10^2 V)
P = 5x10^2 W
That's false. Mechanical waves (like sound and ocean waves) do
need a medium to travel in, but electromagnetic waves (like radio
and light) don't.
A. We know that the height (h) = 25 m, and the distance (x) = 135 m.
B. We need to find the time flight first (t), then we can find easily the horizontal velocity (
![v_{x}](https://tex.z-dn.net/?f=%20v_%7Bx%7D%20)
. )
C. Because this is a projectile motions, so horizontal velocity is constant, but the vertical velocity is change because of the gravitational acceleration.
So we can use :
![h = \frac{1}{2} g t^{2}](https://tex.z-dn.net/?f=h%20%3D%20%20%5Cfrac%7B1%7D%7B2%7D%20g%20t%5E%7B2%7D%20)
,
Note : Time that will be exist is a time from a land to the takeoff point, that can be called as the time flight.
Then we use,
![x = v_{x} t](https://tex.z-dn.net/?f=x%20%3D%20%20v_%7Bx%7D%20t)
, to find the horizontal velocity.
D. We know that :
![h = \frac{1}{2} g t^{2}](https://tex.z-dn.net/?f=h%20%3D%20%20%5Cfrac%7B1%7D%7B2%7D%20g%20t%5E%7B2%7D%20)
, so by insert the numbers, and assune that the (g = 10 m/
![s^{2}](https://tex.z-dn.net/?f=%20s%5E%7B2%7D%20)
), we get that ( t =
![\sqrt{5}](https://tex.z-dn.net/?f=%20%5Csqrt%7B5%7D%20)
. )
After that by using
![x = v_{x} t](https://tex.z-dn.net/?f=x%20%3D%20v_%7Bx%7D%20t)
, we can get that
Answer: That's air resistance.
Explanation: Well, air resistance is an upward force exerted on falling objects.
( I hope this helped <3 )