A lever and fulcrum are used to raise a heavy rock, which has a weight of 200 N. If the lever has a mechanical advantage of 11.4. what must the input force on the lever be in order to just begin lifting the rock?​

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.

Which of the following are considered noble gases? a. bromine b. neon c. argon d. chlorine

Ryan is examining the energy of the particles in a bar of gold. what is ryan most likely studying?