21. Melissa and Steven are both pulling on a rope, Steven has a mass of 80 kg and is pulling to the right with 40 Newtons of force. Melissa has a mass of 50 kg and is pulling to the left with 30 Newtons of force.

a. What is the net force between Melissa and Steven?

b. Melissa lets go. What is the net force?

6. What will Steven's acceleration be?

Pls help me !!

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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no. bullets are macro objects. wave nature is for light waves, extremely tiny particles. if a light particle was the size of your finger, the bullet would be the size of the universe. so basically, that huge difference in size makes the wave nature of matter insignificant.