:the launching velocity of a projectile is 20m/s at 53 degrees above the horizontal. what is the vertical component of its velocity at launch? neglecting air friction, which of these components remains constant throughout the flight path? which of these components determines the projectile's time in the air?

Certain bacteria (such as aquaspirillum magnetotacticum) tend to swim toward the earth’s geographic north pole because they contain tiny particles, called magnetosomes, that are sensitive to a magnetic field. if a transmission line carrying 100 a is laid underwater, at what range of distances would the magnetic field from this line be great enough to interfere with the migration of these bacteria? (assume that a field less than 5% of the earth’s field would have little effect on the bacteria. take the earth’s field to be 5.0 * 10-5 t, and ignore the effects of the seawater.)