I think it’s A because it makes the most sense
Answer:
A
Explanation:
the string would be dangling backwards because you are moving forward it would be putting backward force on the string
Answer: 1600 km from the surface
Explanation:
![E = \frac{GM}{R^{2} }\\g1 = \frac{GM}{R1^{2} } \\R1 = 6400 km\\g2 = 0.64g1\\\frac{g1}{g2} = \frac{\frac{GM}{R1^{2} } }{\frac{GM}{R2^{2} } } \\\frac{g1}{0.64g1} = \frac{R2^{2}}{R1^{2} }\\\frac{1}{0.64} = \frac{R2^{2}}{6400^{2} }\\\\\frac{1}{0.8} = \frac{R2}{6400}\\\\R2 = \frac{6400}{0.8}\\R2 = 8000 km\\](https://tex.z-dn.net/?f=E%20%3D%20%5Cfrac%7BGM%7D%7BR%5E%7B2%7D%20%7D%5C%5Cg1%20%3D%20%5Cfrac%7BGM%7D%7BR1%5E%7B2%7D%20%7D%20%5C%5CR1%20%3D%206400%20km%5C%5Cg2%20%3D%200.64g1%5C%5C%5Cfrac%7Bg1%7D%7Bg2%7D%20%3D%20%5Cfrac%7B%5Cfrac%7BGM%7D%7BR1%5E%7B2%7D%20%7D%20%7D%7B%5Cfrac%7BGM%7D%7BR2%5E%7B2%7D%20%7D%20%7D%20%5C%5C%5Cfrac%7Bg1%7D%7B0.64g1%7D%20%3D%20%5Cfrac%7BR2%5E%7B2%7D%7D%7BR1%5E%7B2%7D%20%7D%5C%5C%5Cfrac%7B1%7D%7B0.64%7D%20%3D%20%5Cfrac%7BR2%5E%7B2%7D%7D%7B6400%5E%7B2%7D%20%7D%5C%5C%5C%5C%5Cfrac%7B1%7D%7B0.8%7D%20%3D%20%5Cfrac%7BR2%7D%7B6400%7D%5C%5C%5C%5CR2%20%3D%20%5Cfrac%7B6400%7D%7B0.8%7D%5C%5CR2%20%3D%208000%20km%5C%5C)
Therefore, 8000 km - 6400 km = 1600 km from the surface
Answer: Counting is the only type of measurement that is free from uncertainty, provided the number of objects being counted does not change while the counting process is underway.
PLEASE MARK ME AS BRAINLIEST! Hope this helped!
Answer:
<em>The penny will hit the ground at 6.39 seconds</em>
Explanation:
<u>Free Fall</u>
The penny is dropped from a height of y=200 m. The equation of the height on a free-fall motion is given by:
![\displaystyle y=\frac{gt^2}{2}](https://tex.z-dn.net/?f=%5Cdisplaystyle%20y%3D%5Cfrac%7Bgt%5E2%7D%7B2%7D)
Where
, and t is the time.
Solving for t:
![\displaystyle t=\sqrt{\frac{2y}{g}}](https://tex.z-dn.net/?f=%5Cdisplaystyle%20t%3D%5Csqrt%7B%5Cfrac%7B2y%7D%7Bg%7D%7D)
Using the value y=200:
![\displaystyle t=\sqrt{\frac{2*200}{9.8}}](https://tex.z-dn.net/?f=%5Cdisplaystyle%20t%3D%5Csqrt%7B%5Cfrac%7B2%2A200%7D%7B9.8%7D%7D)
t=6.39 sec
The penny will hit the ground at 6.39 seconds