An astronaut on a space walk floats a little too far away from the space station. Without air to push against, he
cannot paddle back. However, the astronaut is holding a
hammer. Explain how the astronaut could use the
hammer to move and why this will get him back to the
space station.

Anybody wanna ? (picture included? )

Which of the following is a measure of the amount of light a star directly emits?               a.  luminosity    b.  intensity    c.  wavelength    d.  brightness

Consider the phase change taking place in the picture. you could use all but one statement to describe what is happening here. that is: a) temperature is increasing. b) kinetic energy is increasing. c) the space between the particles remains the same. d) the attractive force between the particles is decreasing.