In a Class I lever the effort arm is 60 cm and the load arm is 20 cm. Mechanical advantage is:
A3
B1/3
C40
D80
Answer & Solution
Correct answer: A. 3
1. For a lever in equilibrium, load * load_arm = effort * effort_arm.
2. So M.A. = load / effort = effort_arm / load_arm.
3. M.A. = 60 / 20 = 3.
4. So mechanical advantage is 3.
_Source: Selina Concise Physics ICSE Class 10, Ch 3 'Machines' (aplustopper.com extract)_
Related questions
Why does increasing the length of an inclined plane reduce effort?In an ideal block and tackle with 5 strings supporting the load, the effort needed to liftA force multiplier always has:Which of the following has M.A. of 1?A boy can apply effort of 100 N. If he wants to lift a 400 N load, the M.A. of the machineIf a 200 N load is lifted 0.5 m using a 50 N effort moving 2 m, find efficiency:A pulley arrangement has 3 movable and 1 fixed pulley. Ideal V.R. is:A force multiplier is a machine whose: