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
The ideal mechanical advantage of a lever in which the effort arm is 60 cm and the load arm is 4 cm.
15
20
30
40
While ascending a hill, the driver keeps the gear ratio.
equal to 1
less than 1
greater than 1
either equal to 1 or greater than 1
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
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
A movable pulley is used as:
force multiplier
speed multiplier
device to change the direction of effort
all the above
Nodding action of head is an example of :
Class I lever
Class II lever
Class III lever
The opposing force to be overcome by a machine is:
Effort
Load
Fulcrum
Both a and b
Raising the weight of the body on toes is an example for:
