An electron is shot into one end of a solenoid. as it enters the
uniform magnetic field within the solenoid, its speed is 800 m/s and its velocity vector makes an angle of 30° with the central axis of the solenoid. the solenoid carries 4.0 a and has 8000 turns along its length. how many revolutions does the electron make along its helical path within the solenoid by the time it emerges from the solenoid’s opposite end? (in a real solenoid, where the field is not uniform at the two ends, the number of revolutions would be slightly less than the answer here.)

the total distance traveled by the car is

30km + 49km = 79 km .

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.

heats surface water up