Answer:
A
Explanation:
There is a mechanical advantage in this system....
she only needed 100 N to lift 500 N
1:5 she lifted it 2 meters, so if there WAS NO friction, she would have to pull in 5 x 2 = 10 meters
but there IS friction so she must have pulled in MORE than 10 m
Answer:
B
Large mountains ranges will form
Explanation:
Answer:
1.208
Explanation:
L = Length of tube
c = Speed of light in air
v = Speed of light in jelly
Time taken by light in tube

Time taken when jelly is present

Dividing the above equations we get

The refractive index of the jelly is 1.208
Answer:
Explanation:
Check attachment for solution