Why does the rotation curve of the Milky Way imply the presence of dark matter? Group of answer choices Because we directly detected dark matter at the outskirts of the Milky Way using more sensitive telescopes and instruments Because the galactic halo has retrograde and prograde orbits Because the Milky Way would not rotate without any dark matter Because stars and ISM clouds orbit slower than expected from the visible mass in our galaxy Because stars and ISM clouds orbit faster in the outskirts, which can only be explained by the gravity of invisible mass

Aman tries to push a box of mass 4 kg with a force of 5 n but the box remains stationary if the coefficient of static friction is 0.45, what is the value of the maximum force of friction?

Two technicians are discussing a resistance measurement between the can-h and can-l wires. technician a says this measurement should be done with the ignition switch in the "run" position. technician b states that a measurement of 0 ohms indicates an open in the network. which technician is correct?

Astudent is performing an experiment comparing sound and light waves. the student gathers the following data. what conclusion does the student most likely make based on this data? light waves always travel the same speed; however, the speed of sound is determined by the medium that it travels through. all sound waves always have the same energy, so the temperature of the medium does not affect wave speed. light needs to vibrate particles, so it travels fastest in tightly packed solids, while sound does not need a medium, so it travels fastest in a gas. tightly packed particles in solids slow down the light waves; however, sound waves make particles bounce into each other, so they travel faster in solids.