Which of the following best explains why the atomic theory changed over the past 200 years?
New experiments led to revised ideas.
Few people believed it was correct.
The atomic model was incomplete.
The theory was terribly flawed.

In a vernier instrument the main scale is in 1/2 mm divisions .vernier is made by redividing 19 such divisions into 20 equal parts. calculate the least count of the instrument.

What object a collides with object b and bounces back its final momentum is?

Aprotein molecule in an electrophoresis gel has a negative charge. the exact charge depends on the ph of the solution, but 30 excess electrons is typical. what is the magnitude of the electric force on a protein with this charge in a 1600n/c electric field? write in two significant numbers, and also in newton