Which excerpt from A Black Hole Is NOT a Hole is meant to help readers understand what a black hole looks like? “If you could somehow take a close-up picture of a black hole, it wouldn't be one for the scrapbook. It would just be blank . . . and black.”
“Just outside the event horizon of a black hole, light's energy keeps it zipping along, like that fish swimming along the outer edge of a whirlpool.”
“As the light continues traveling in its new direction, it gets even closer to the center of the black hole, where gravity is even stronger.”
“Just as you rely on the rise and fall of a melody's tune and volume to recognize a particular song, scientists look for a unique pattern in the rise and fall of the X-rays to identify a black hole.” ITS NOT D

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm.   the wire diameter is d = 0.9 mm.   the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a                                          

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2)   in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation:

ok if it wasn't the hans one it was probably c or he thought the mountain was collapsing on them.

the answer would either be a or d

i hope this

reflexive.the third one.