Answer:
1.) A - 1,2,1,2
2.) Both forces can act without objects touching.
3.) C
Both can be modeled as waves having amplitude, frequency and wave lengths.
4.) A, B and C
Explanation:
1.) SO2 + ___ H2 ----------> _____ S + _______H2O
Looking at above equation, we have one molecule of surfur at the right hand side (RHS), and one molecule of surfur at the left hand side (LHS).
Two atoms of hydrogen and both RHS and LHS
But oxygen is not balanced. We have two atoms of oxygen at the RHS while having one at the LHS.
So let's make oxygen 2 atoms at LHS by adding 2 to water molecules and hydrogen molecules at the RHS.
SO2 + ___ 2H2 ----------> _____ S + _______2H2O
The correct answer is A - 1,2,1,2
2.) Both magnetic force and gravitational force obey inverse square law with distance. They are not directly proportional but inversely proportional to the square distance. B is the correct answer because Both forces can act without objects touching.
3.) Light waves are transverse waves which can travel through a vacuum without a medium while sound waves are longitudinal waves which cannot travel through vacuum without a medium. But both can be modeled as waves having amplitude, frequency and wave lengths.
4.) If an object is slowing down, due to conservation of energy,
The potential energy could be increasing, like a ball thrown into the air.
The kinetic energy could be lost to friction or air resistance.
The ball could be returning to its natural resting state.
