Answer:
A list
Explanation:
1. Reload the page to see that same message will pop up. It its a system bug reloading the page should eliminate such bug.
2. If its an app, close the app and try logging into it again. If after logging in again, the problem still persists you may need to clear the app's cache.
Note: During this will delete every data on the app.
If this does not work also, you could try deleting the app and reinstalling it.
3. You should also check if the network signal is as strong as it should be. If it isn't, turn "off" the network and then turn it "on" again. This will serve as refreshing your network.
4. You could also go online and ask the community to know if the problem is general or just peculiar to you.
5. You could also utilize the "contact us" option, its usually at the button of the page. This will lead you to a tab where you can chat with a customer rep and describe your problems.
6. If every of the solution above does not cut it, you should restart your device so as to reboot the device operating system.
Answer:
b) electrons jump onto or off the neutral ball when a charged object comes close
Explanation:
What causes a pithball to move is when "electrons jump onto or off the neutral ball when a charged object comes close".
The pithball electroscope is actually used to test if a body is charged or not. When a charged body is brought near the pithball, the ball moves. The movement of that charged body reveal that there are electrons it is carrying.
The pithball can actually be charged. It is charged by touching a charged object to it. This leads to some of the charges on the surface of the charged object moving to the surface of the ball. The pith-ball electroscope was invented by John Canton, a British schoolmaster and physicist in 1754.
Answer: PE = 800j, KE = 800J
Explanation:
To calculate the potential energy, we use the formula
Potential Energy = Mgh
M = 20kg, g = 10m/sˆ2 , h = 4m
=20 × 10 × 4
=800J
At the maximum height S = 4 and the initial velocity u = 0 The acceleration g = 10m/sˆ2
Using the third equation of motion
vˆ2 = uˆ2 + 2as
= 0ˆ2 + 2 × 10 × 4
vˆ2 = 80
Kinetic Energy (KE) is given by
KE = ½ mvˆ2
= ½ × 20 × 80
=800J
