(timed for ) which best defines scientific question?

a. a scientific question is based on investigations and can be answered through a conclusion.
b. a scientific question is based on observations and can be answered through an investigation.
c. a scientific question is based on investigations and can be answered through an observation.
d. a scientific question is based on conclusions and can be answered through an investigation.

The great sandini is a 60.0-kg circus performer who is shot from a cannon (actually a spring gun). you don’t find many men of his caliber, so you him design a new gun. this new gun has a very large spring with a very small mass and a force constant of 1100 n/m that he will compress with a force of 4400 n. the inside of the gun barrel is coated with teflon, so the average friction force will be only 40.0 n during the 4.00 m he moves in the barrel. at what speed will he emerge from the end of the barrel, 2.50 m above his initial rest position?

Why should the wavelength scale of spectroscope be calibrated

Estimate the magnitude of the electric field due to the proton in a hydrogen atom at a distance of 5.29×10 to the power of −11 m, the expected position of the electron in the atom.