For the above equation find the work done by the falling mass in its displacement by 8 m.
5000 J
1000 J
8000 J
2000 J
A single fixed pulley is used because it
has a mechanical advantage greater than 1
has a velocity ratio less than 1
gives 100% efficiency
helps to apply the effort in a convenient direction
The lever for which the mechanical advantage is less than 1 has:
fulcrum at mid point between load and effort
load between effort and fulcrum
effort between fulcrum and load
load and effort acting at the same point
A uniform seesaw 5 m long is supported at its centre. A boy weighing 40 kgf sits at a distance of 1 m from the centre of seesaw. To which class of lever does it belong?
Class I
Class II
Class III
Class I & II
Foot treadle and sugar tongs are examples for:
Class I lever
Class II lever
Class III lever
Class I & II lever
Nut cracker is an example for:
A crowbar 2 m long is pivoted about a point 10 cm from its tip. Mechanical advantage of crowbar is
19
18
12
10
Which type of lever is this?
Nothing can said
Efficiency of an ideal machine is
50%
100%
90%
75%
Mechanical advantage (MA), load and effort related as
MA = L x E
MA x E = L
E = MA x L
None of these
