An isolated black hole in empty intergalactic space would be difficult to detect because Group of answer choices there would be no stars behind it whose light would be affected by gravitational lensing. it could not emit light from inside its event horizon. no companion stars would be affected by its gravitational field. no matter would be falling into it to create an X-ray-emitting accretion disk. all of the others.

Answer as quick as ! kate is working on a project in her tech education class. she plans to assemble a fan motor. which form of energy does the motor convert most of its electric energy into? a. light energyb. motion energyc. sound energyd. thermal energy

1.what is where an object is located 2. what is how fast an objects speed is changing 3. what is how fast an object is moving

As you are trying to move a heavy box of mass m, you realize that it is too heavy for you to lift by yourself. there is no one around to , so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. you pull up on the rope to lift the box. use g for the magnitude of the acceleration due to gravity and neglect friction forces. once you have pulled hard enough to start the box moving upward, what is the magnitude f of the upward force you must apply to the rope to start raising the box with constant velocity? express the magnitude of the force in terms of m, the mass of the box.