If a black hole with a diameter of 15 kilometers and a mass of 90 kilograms were to appear right in front of you, it would have an incredibly high density and immense gravitational pull. Here are some consequences:
Spaghettification: As you move closer to the black hole, the gravitational force acting on your body would be much stronger on the side closer to the black hole compared to the side farther away. This difference in gravitational pull would cause a tidal force, stretching your body in a process known as spaghettification. You would be stretched into a long, thin shape resembling spaghetti.
Extreme Gravitational Attraction: The gravitational pull of the black hole would be extremely powerful. Since you are very close to it, the gravitational force would be much stronger on you than on other objects around. You would be irresistibly drawn toward the black hole, and it would be impossible for you to escape its pull without external intervention.
Time Dilation: As you approach the black hole, the intense gravitational field would cause time dilation. Time would appear to slow down for you relative to someone observing from a distance. This means that from the perspective of an outside observer, your actions and movements would appear to slow down as you get closer to the black hole.
Event Horizon: The event horizon is the boundary of a black hole beyond which nothing, including light, can escape. In the case of a black hole with a mass of only 90 kilograms, the event horizon would be extremely small, much smaller than the size of the black hole itself. As you approach the black hole, you would cross this event horizon, and once inside, you would be unable to communicate or escape.
It's important to note that the scenario you described, with a black hole of such a small mass and size, is not consistent with our current understanding of black holes. Black holes typically form from the collapse of massive stars and have much larger masses. The consequences described here are based on the general principles of black hole physics, but the specific details would depend on the actual mass and size of the black hole.