A block-and-tackle pulley is used to lift an object weighing 2000 N using an effort force of 500 N. Determine the mechanical advantage of the pulley. A. 1500 B. 2500 C. 0.24 D. 4​

Astudent is given an assignment to demonstrate diffraction. he takes a photograph of a straw in a glass of water. the straw appears bent at the water level. which best describes this example? a) this is a good example of diffraction. b) this is an example of dispersion and not diffraction. c) this is an example of refraction and not diffraction. d) this is an example of reflection and not diffraction.

Pls pls pls pls ! describe, in your own words, how you found the epicenter of the earthquake.

In a stagnant pool of water, a crayfish may spend much of its time lying with one side of its carapace near the surface of the water. in this position, it will move the walking legs on that side in a rhythmic back-and-forth motion. explain the likely function of this behavior.