Do i become a professional astrophysicist after getting phd in astrophysics ? or will i be a postdoc research student i mean will i be practicing under another researcher ? will i get the correct salary just after finishing phd ?

Amodel rocket with a mass of 0.212 kg is launched into the air with an initial speed of 84 m/s. how much kinetic energy will the rocket have at a height of 214 m? assume there is no wind resistance. 634 j 303 j

Unpolarized light whose intensity is 1.19 w/ is incident on a polarizer. (a) what is the intensity of the light leaving the polarizer? (b) if the analyzer is set at an angle of = 41.0∘ with respect to the polarizer, what is the intensity of the light that reaches the photocell?

Which notation is used to represent an alpha particle? a. b. c. d.