To resolve an object in an electron microscope, the wavelength of the electrons must be close to the diameter of the object. what kinetic energy, , must the electrons have in order to resolve a protein molecule that is 2.80 nm in diameter? take the mass of an electron to be 9.11×10−31 kg .

You are given two vectors a⃗ =−3.00ι^ 5.00j^ and b⃗ =5.00ι^ 2.00j^. let the counterclockwise angles be positive.

Which of the following situations is impossible? a) an object has velocity directed east and acceleration directed east. b) an object has zero velocity but non-zero acceleration. c) an object has constant non-zero velocity and changing acceleration. d) an object has velocity directed east and acceleration directed west. e) an object has constant non-zero acceleration and changing velocity.

Which word expression describes how much to calculate pressure