First to answer and gets it correct gets brainliest What creates Earth's magnetic field? Choose the best answer from the selections below.

a

the hot, dense ball of solid iron at the Earth's inner core

b

hot swirling iron at the Earth's outer core

c

The north and south poles

d

magnetic force

Asilver dollar is dropped from the top of a building that is 1324 feet tall. use the position function below for free-falling objects. s(t) = −16t2 + v0t + s0 (a) determine the position and velocity functions for the coin. s(t) = v(t) = (b) determine the average velocity on the interval [1, 2]. ft/s (c) find the instantaneous velocities when t = 1 second and t = 2 seconds. v(1) = ft/s v(2) = ft/s (d) find the time required for the coin to reach the ground level. (round your answer to three decimal places.) t = s (e) find the velocity of the coin at impact. (round your answer to three decimal places.) ft/s

Your friend increases her force on the desk by 30n . she doesn't change the direction of her push . what happens to the net force on the desk .will the desk accelerate

What do we mean by the event horizon of a black hole?