The operating efficiency of a electric motor that lifts a 9 kg mass against gravity…

PHYSICS · Single correct · AP · Physics 1: Algebra-based · Work Energy and Power · Work Energy and Power

Problem

18. The operating efficiency of a

0.5 \mathrm{~A}, 120 \mathrm{~V}

electric motor that lifts a 9 kg mass against gravity at an average velocity of

0.5 \mathrm{~m} / \mathrm{s}

is most nearly (A)

13 \%

(B)

25 \%

(C)

53 \%

(D)

75 \%