Answer:
The mass number is the product of number of protons and number of neutrons
The atomic number is the same as the mass number but just put amu next to the number
The question should be D: Non-repeating
Answer:
570 N
Explanation:
Friction = normal force × coefficient of friction
F = Nμ
71.2 = N (0.125)
N = 569.6
Rounded to 3 significant figures, the normal force is 570. N.