If forces acting on an object are unbalanced, the object could experience a change in .

mass, speed, or direction
negative acceleration or mass
direction, mass, or both
speed, direction, or both

What is the role of the ocular lens?

Abeam of electrons with of wavelength of 7.5 x 10-6 m is incident on a pair of narrow rectangular slits separated by 0.75 mm. the resulting interference pattern is projected onto a screen 10.0 m from the slits. what is the separation of the interference maxima in the resulting interference pattern?

An object weighs 40n in air, weighs 20n when submerged in water and 30n when submerged in a liquid of unknown density. what is the density of the liquid?