PLEASE HELP I GIVE BRAINLIEST AND THANKS AND 5 STAR Ok so basically I put some attachments at the bottom and its a worksheet pls someone help me ask much as you can (don't mind the in class boxes)

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

The graph below represents the work done by a student while running up flights of stairs. determine the student's power output after 10 seconds: 1600 j/s 8000 j/s 160 j/s 800 j/s

At 20∘c, the hole in an aluminum ring is 2.800 cm in diameter. you need to slip this ring over a steel shaft that has a room-temperature diameter of 2.804 cm . 1. to what common temperature should the ring and the shaft be heated so that the ring will just fit onto the shaft? coefficients of linear thermal expansion of steel and aluminum are 12×10−6 k−1 and23×10−6 k−1 respectively.