Why should it take significantly more energy to move a beam of alpha particles than a beam of beta minus particles

What is the conversion factor between kg/m^3 and g/m^3. express your experimental values for the densities in kg/m^3.

What is the role of the ocular lens?

When considering gravity acceleration and the force of acceleration, what must be true? a. the direction of acceleration must be perpendicular to the direction of the force. b. the direction of the force and the direction of acceleration must be the same as each other. c. the direction of the force and the direction of acceleration must be opposite of each other. d. the mass of the body must be the same as the acceleration of the body.