Subject :NSO Class : Class 8
Read the given passage and answer the following questions. A cuboid rests on the floor. Data of the cuboid and some other parameters are given here.
By rotating the cuboid, what is the minimum pressure it can exert on the floor?
A7500 Pa
B10000 Pa
C5000 Pa
D20000 Pa
Ans 1:
Class : Class 8
Minimum pressure means maximum area as pressure is inversely proportional to area
so, 1 cm = 1/100 m
so the Largest area is 40cm*30cm = 4/10* 3/10 = 12/100
P =F/Area
P = Mass*acceleration/area
P = 60*10/(12/100)
P = 600 * 100/12
P = 60000/12 = 5000
so answer is C
Ans 2:
Class : Class 9
C is the answer