In an experiment, mary compares a collision of two 1-kilogram steel balls with a collision of two 1-kilogram foam rubber balls. she makes sure that, except for the material, the two collisions are the same. mary finds that the force of impact of the steel ball collision is greater than the force of impact of the foam rubber ball collision.

from her force measurements, mary concludes that the foam rubber balls’ acceleration during the collision was (blank) the steel balls’ acceleration. she concludes that the collision between the foam rubber balls is an collision.

blank 1
greater than
less than
the same as

blank 2
inelastic
elastic

Alinearly polarized electromagnetic wave has an average intensity of 196 w/m^2. this wave is directed towards two ideal polarizers (in real polarizers, transmission is also effected by reflection and absorption). polarizer a is oriented with its transmission axis at an angle of θ_1=20.8∘ with the incident electric field. polarizer b has its axis at an angle of θ_2=63.0∘ with the incident electric field. what is the average intensity of the wave after it passes through polarizer a? what is the average intensity of the wave after it passes through polarizer b? suppose that the two polarizers a and b are interchanged. what would the average intensity be after passing through both polarizers?