Which of the following is happening right now in the Milky
Way?
a
The Sun is orbiting the Milky Way's galactic center
b
The Earth is orbitincelme Sun
C
Earth's Moon is orbiting the Earth
d All of the above

Using a wheel and axle, a farmer is trying to lift a bucket of water from the bottom of a well. the larger wheel has a radius of 40 cm compared to the axle that has a radius of 10 cm. if a bucket of water is 50 n, then how much effort is required to raise it? 12.5 n 200 n 2 n 500 n

What is the energy of a photon of ultraviolet radiation with a frequency of 4.4 × 1015 hz? planck’s constant is 6.63 × 10–34

It is really hard for me right know