Could somebody please help me with these physics questions?

Question

Two boxes with different masses are tied together on a frictionless ramp surface.

 

 where L = 2.39 and M = 1.70.

What is the tension in the lower cord? What is the tension in the upper cord?

A hammer (mass 0.670 kg) rests on the surface of a table.

Which forces must be equal in magnitude and opposite in direction even though they are not interaction partners?

 

(1) The force of Earth pulling on the hammer.

 

(2) The force of the table pushing on the hammer.

 

(3) The force of the hammer pushing on the table.

 

(4) The force of the hammer pulling on Earth.

Select all that apply:

1 and 2

2 and 3

3 and 4

1 and 4

Answer 1

For the first question, I have explained the process to find the cord tensions in the attached video.

For the second question, hint: gravitational forces between two masses are not considered 'interaction partners'.