৩৮০৫
The safe speed for a train rounding a corner is proportional to the square root of the radius. If the safe speed for a curve of radius 49 meters is 28 km/h. The safe speed for a curve of radius 64 metes is:
উত্তর
(256/7)km /h
(256/7) km /h
৩৮০৮
A motorist estimates that his annual expenditure distance traveled. The cost when he travels 400 km is $100 and when he travels 600 km is $ 125. The cost when he travels 640 km is -
উত্তর
$ 130
৩৮০৯
The illumination of a bulb varies inversely as the square of the distance. If the illumination is 6 lux at a distance of 5 meters whet is illumination at a distance of 3 meters?
উত্তর
12
৩৮১০
The height and weighs of a solid cone are 6 cm and 2.7 kg. The weighs of a similar cone of 5 cm height is _____.
উত্তর
5.75 kg