How much work was a baby doing if she used a force of 2N and pulled her rattle for 1.3 M?

Why are some galaxies’ spectra blueshifted rather than redshifted? question 4 options:

Ahydroelectric plant takes energy from water and turns it into electrical energy. what are the transformations of energy in the water molecules that are used in the process of generating electricity this way?

10 newton object is placed 3 meters from the fulcrum. at what distance on the other side would you need to place a 15 newton object to balance the lever? show your work!