The two jovian planets that contain the highest proportions of hydrogen compounds are
a) jupiter and neptune
b) saturn and uranus
c) jupiter and saturn
d) jupiter and uranus
e) uranus and neptune
f) saturn and neptune

Aray of light traveling parallel to the principal axis of a concave mirror will be reflected through the mirror's

The air that we breath is made mostly of which gaseous molecule

Awater balloon launcher uses an elastic band with a spring constant of 115 n/m to use thee launcher you stretch thee band back with a balloon n it the water balloons have a mass of 1.3 kg a) if you stretch the band by 0.8 m, what elastic force will the band exert? b) with the band stretched 0.8 m, how much elastic potential energy is stored in the spring? c) if you release the band, it pushes forward. what is the kinetic energy of the balloon when it reaches the natural length of the band? d) what is the speed of the balloon when it reaches the natural length of the band?