Astronomers believe there are something like 100 million neutron stars in the galaxy, yet we have only found about 2000 pulsars in the milky way. give several reasons these numbers are so different. explain each reason.

Work out sian speed for the first 30 minutes of her journey. give your answer in km/h.

In a stagnant pool of water, a crayfish may spend much of its time lying with one side of its carapace near the surface of the water. in this position, it will move the walking legs on that side in a rhythmic back-and-forth motion. explain the likely function of this behavior.

If two students are running down the hall toward each other, trying to get to class, and they have the same mass and acceleration, what will happen when they collide? will their forces cancel out or will each one experience a reaction?