Since its mass is 145 metric tons, the barge must displace 145 metric tons of water in order to float. 145 metric tons= 145,000 kilograms. Use the rough-but-close rule of thumb that 1 liter of water has 1 kilogram of mass. So the barge displaces 145,000 liters, which is also 145 cubic meters of water.
(Length) x (width) x (depth of the part under water) = 145 cubic meters
Draft of the barge (depth under water) = 145 / (50 x 20) = 145/70 = <em>2.07 meters</em>.
No, it will not clear the reef 1.5 meters below the surface. Either the barge will shave off the top 0.57 meter of the reef, or else the reef will do serious damage to the barge. In any case, there will be a situation.
The last significant figure is inherently uncertain because of the rounding off. The rounding-off uncertainty is usually half of the last figure's decimal-place value if no other uncertainty is expressed. As a rule of thumb results of measurements and calculations have a limited number of significant figures.
A. a laser system developed by NASA to help spaceship dock with space stations was later adapted to help doctors perform eye surgery.
Option A is correct because it is the statement that describes an unanticipated impact of a technological advance.
The laser system used in spaceship has been discovered to be useful during eye surgeries. In astronaut, the eye tracking device is used to used to track the eyes without interfering with the work of the astronaut. Also, it now became useful in surgery in tracking the position of the eye without interfering with the surgeon's work.