Sure, but they must be properly secured and stowed in accordance with the weight and balance diagram of the plane. For that, the pilot or loadmaster will need to know the gross weight.
You have a ball on an airplane..
Depends on the kind of airplane.
no
No.
no
Weight of an object in a flying airplane will lessen very, very, very slightly due to being farther from the center of the earth (gravity), but its mass remains constant.
induction cooker airplane
no
Yes
Yes, you can.
From where.
yes