Aball is thrown onto a rough floor at an angle theta. if it rebounds at an angle phi and the coefficient of kinetic friction is determine: (a) the coefficient of restitution e. (b) further simplify the expression if theta = phi = 45°. (c) from the previous part, determine the coefficient of friction if = 0.6. neglect the size of the ball. hint: show that during impact, the average impulses in the x and y directions are related by = . since the time of impact is the same, δ = δ or = .

they are non-matter

explanation:

they are non-matter. basically, any type of energy or any abstract concept is an example of something that does not matter. other examples include dreams, magnetism, radio, and hate

there is no correct list among the choices you've provided.

the list might look something like this:

-- baby human

-- piccolo

-- flute

-- soprano singer

-- trumpet

-- tenor singer

-- trombone

-- baritone singer

-- baritone horn

-- bass singer

-- tuba

since i had to make up the list myself, i made it easy on myself, and i didn't try to shuffle the string instruments and woodwinds into it too.