The answer is B. 79 joules.
To calculate this we will use the formula for potential energy (PE):
PE = m * g * h
where m is mass of an object, g is gravitational acceleration, h is a height at which is the object.
It s given:
m = 8.10 kg
g = 9.8 m/s²
h = 0.99 m
After replacing them in the formula for potential energy:
PE = 8.10 * 9.8 * 0.99 = 78.6 J ≈ 79 J
Answer:
In 2.748 sec the mailbag reached the ground
Explanation:
We have given height from the ground ![h=3.25t^3](https://tex.z-dn.net/?f=h%3D3.25t%5E3)
At t =2.25 sec helicopter releases a small mailbag so at t = 2.25 sec height from the ground ![h=3.25t^3=3.25\times 2.25^3=37.01m](https://tex.z-dn.net/?f=h%3D3.25t%5E3%3D3.25%5Ctimes%202.25%5E3%3D37.01m)
When the mail box is drooped its initial velocity would zero so u = 0 m/sec
Acceleration due to gravity ![g=9.8m/sec^2](https://tex.z-dn.net/?f=g%3D9.8m%2Fsec%5E2)
According to third law of motion ![h=ut+\frac{1}{2}gt^2](https://tex.z-dn.net/?f=h%3Dut%2B%5Cfrac%7B1%7D%7B2%7Dgt%5E2)
![37.01=0\times t+\frac{1}{2}\times 9.8\times t^2](https://tex.z-dn.net/?f=37.01%3D0%5Ctimes%20t%2B%5Cfrac%7B1%7D%7B2%7D%5Ctimes%209.8%5Ctimes%20t%5E2)
![t^2=7.553](https://tex.z-dn.net/?f=t%5E2%3D7.553)
t = 2.748 sec
True. The amount of water on Earth is consistent even if it is displayed in different forms.
The answer is substance A
Answer:
id say false
I might be wrong but ye i think its false
Explanation: