Look at the image below. HI
Both of the people on the left are pulling with a force of 55 N to
the left. On the right side of the rope, one person is pulling with
35 N to the right, and the other person is pulling 20 N to the right.
What is the net force on the rope?

a polar bond is formed when electrons are shared unevenly between atoms

the answer is 0.42 is that is an option. this question provides no info

percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally