The rocket goes upwards because the hot gases shoot downwards out of the nozzle. The faster the gases go downwards, the faster the rocket goes upwards.  If John decreases the rate at which gas exits the bottom of his rocket, what will happen to the upward momentum of the rocket? It will increase or decrease?
decrease


(Question)
Differences in air pressure over the surface of the Earth result in wind. The greater the differences in air pressures, the stronger the wind.  When you have air pressures change very little what happens to the wind decreases or increases?
(Answer)
decreases


Ques: Acids have pH values below 7. The lower the pH value, the more strongly acidic the substance.  You can find tables that show the pH value of different fruits and vegetables. The fruits such as oranges are very acidic so they have a pH value that is higher or lower?
Ans: lower


(Q).
Its harder to overcome friction between heavier objects and the floor than it is between lighter objects and the floor.  If you tried to push a sack of feathers or a sack of hammers, both of the same volume, would it be easier to push the sack of feathers or sack of hammers??
(A).
sack of feathers


Ques:As blood glucose levels decrease, less insulin is produced.  Polly was managing her diabetes. As her blood glucose levels increase or decrease, her body produces less insulin so she would need to supplement this?

Ans:decrease


Ques:Water becomes more dense when it is colder and when it has more salt.  When ice melts into water it becomes less dense. or more dense?

Ans:
less dense.