D) the north star is not part of our solar system...
hope this helps!
Answer:
the focal length of the mirror is : ![f=-2.5\,\,cm](https://tex.z-dn.net/?f=f%3D-2.5%5C%2C%5C%2Ccm)
Explanation:
Use the formula for the formation of image using a divergent mirror and recalling that the image (s') that this mirror formed is virtual, so it is entered as a negative number in the formula. Use the object position (s) as 10, the image position (s') as -2, and derive the value of the focal length:
![\frac{1}{s} +\frac{1}{s'}=\frac{1}{f}\\\frac{1}{10} +\frac{1}{-2}=\frac{1}{f}\\\frac{1}{10} -\frac{1}{2}=\frac{1}{f}\\\frac{10\,f}{10} -\frac{10\,f}{2}=\frac{10\,f}{f}\\f-5\,f=10\\-4\,f=10\\f=-2.5\,\,cm](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7Bs%7D%20%2B%5Cfrac%7B1%7D%7Bs%27%7D%3D%5Cfrac%7B1%7D%7Bf%7D%5C%5C%5Cfrac%7B1%7D%7B10%7D%20%2B%5Cfrac%7B1%7D%7B-2%7D%3D%5Cfrac%7B1%7D%7Bf%7D%5C%5C%5Cfrac%7B1%7D%7B10%7D%20-%5Cfrac%7B1%7D%7B2%7D%3D%5Cfrac%7B1%7D%7Bf%7D%5C%5C%5Cfrac%7B10%5C%2Cf%7D%7B10%7D%20-%5Cfrac%7B10%5C%2Cf%7D%7B2%7D%3D%5Cfrac%7B10%5C%2Cf%7D%7Bf%7D%5C%5Cf-5%5C%2Cf%3D10%5C%5C-4%5C%2Cf%3D10%5C%5Cf%3D-2.5%5C%2C%5C%2Ccm)
Answer:
7.45
Explanation:
At 3.0 m PE = m*g*3.0, KE = m*g*(4.0 - 3.0)
At 2.0 m PE = m*g*2.0, KE = m*g*(4.0 - 2.0)
At 3.0 m PE = m*g*1.0, KE = m*g*(4.0 - 1.0)
At 0 m PE = 0, KE = m*g*h = total energy = 7.45 J
The first one is B
and the second one is A hope this helps
on a different planet I would play a sport similar to soccer. The main difference is that there is zero gravity. To win the game u have to get the ball into the other person's net first.
Explanation:
I was just bored