If an object of mass 10 kg is lifted in 10 mins and 15 s using a motor of 1000 Watt, then what is the amount of wasted energy? What is its efficiency? ps- Efficiency = (amount of work-energy wasted) /energy given
Work(W) = force(F) * distance(s)

a and c

c is 100% but i am confused in a

iron would move it is magnetic there is a mag field around the current in the wire

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.

r = ρ x length / area  

ρ = r x area / length  

ρ is in ohm-meters  

in basic units, it is m³kg/s³a²  

i think this is it.