Answer:
O. 5 g
Explanation:
It literally says for every cm3 its 0.5 g
Answer:
(i)
, (ii)
, (iii) 
Explanation:
(i)
and
represent the points where particle has a velocity of zero and spring reach maximum deformation, Given the absence of non-conservative force and by the Principle of Energy Conservation, the position where particle is at maximum speed is average of both extreme positions:

(ii) Maximum accelerations is reached at
and
.

(iii) Greatest net forces exerted on the particle are reached at
and
.

Answer:
A real emf device has an internal resistance, but an ideal emf device does not.
Magnesium is element 12 in the periodic table and has 2 valance electrons.