It is a chemical change because the salt is dissolving.
Answer:
The sum of PE and KE remains constant
Explanation:
Answer:
16.935 N
Explanation:
In order to make the box start moving, the level force applied on the box (F) must be greater than the force of static friction that keeps the box at rest, which is equal to

where
is the coefficient of static friction
(mg) = 30 N is the weight of the box
Therefore, the condition for F must be:

So, the applied force must be greater than this value.
Answer:
A
Explanation:
the metal lunchbox has a higher conductivity
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