In the diagram above, a rod 50 cm long of uniform cross-s...
In the diagram above, a rod 50 cm long of uniform cross-section is suspended horizontally on a fulcrum, F, by the action of two forces. What is the weight of the rod?
40N
80N
120N
200N
Correct answer is B
Being a uniform rod, the height W should be acting at the mid point 25cm mark.
∴ Taking moment about the fulcrum, F,
200 x 10 = W x 10 + 40 x 30
2000 = 10W + 1200
=> 10W = 2000 - 1200
= 800
w = 800/10 = 80N
Similar Questions
When a ray of light passes from water to glass, it is ...
The joule is equivalent to? ...
The blade of a hoe feel colder to touch in the morning than the wooden handle because the ...
When two like charges are brought together, the potential energy of the system formed will ...
A lamp is rated 240V 60W, calculate the resistance of its filament ...
A block of aluminum is heated electrically by a 30 w heater if the temperature rises by 10°c in ...
A body that produces its own light is said to be ...