How do scientists know that the universe is expanding? The Doppler effect shows stars with red shifted light.

The Doppler effect shows stars with yellow shifted light.

The Doppler effect shows stars with blue shifted light.

The Doppler effect shows stars with green shifted light.

Which of the following is considered to be a vector?               a.  temperature    b.  velocity    c.  time    d.  mass

During spring semester at mit, residents of the parallel buildings of the east campus dorms battle one another with large catapults that are made with surgical hose mounted on a window frame. a balloon filled with dyed water is placed in a pouch attached to the hose, which is then stretched through the width of the room. assume that the stretching of the hose obeys hooke's law with a spring constant of 89.0 n/m. if the hose is stretched by 5.80 m and then released, how much work does the force from the hose do on the balloon in the pouch by the time the hose reaches its relaxed length? unitst 3 number-1497 the tolerance is +/-5% open show work click if you would like to show work for this question:

Two polarizers are oriented at 70∘∘ to one another. unpolarized light falls on them. what fraction of the light intensity is transmitted?