Rupert (66 kg) is now in a full-pipe of radius 25 m, calculate the minimum speed at which rupert can skate to ensure he will not a fall off the skateboard at the top of the pipe? **show work**

at the top most point if Rupert will not fall then normal force at the top point is almost zero for minimum speed

so here we can say

now if

so above will be the minimum speed

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.

we need to know the time interval during which the force acts. impulse of force = momentum change