College Physics with Mastering Physics

Answer:

The conversion formula of nautical miles to miles to solve this problem is as follows:
The speed of the ship is 25 nautical miles per hour.
Now, convert this unit into miles per hour.
Thus, in terms of miles/hour, the speed of the ship is 28.75 mi/h and this speed is greater than the speed of the car which is moving at 25 mi/h.
Hence, the statement of the sailor is true stating that his ship moving with speed 25 nautical miles per hour is greater than the car moving with speed 25 mi/h.

Answer:

The metric ton is not the unit of weight and is for the unit of mas. It is defined as the mass of 1.0 cubic meter of water.
One cubic centimetre is equal to one gram.
Hence the 1.0 metric ton is equal to 1000 kg.

Answer:

A second is a basic time unit based in SI units.
A solar day is not the interval of time that elapses between two successive crossings of the same longitude line (meridian) by the Sun. A second was fixed as 1/86400 of this apparent solar day (1 day = 24h =1440min =86400s).
The mean solar day replaces the original second definition.
The mean solar day is the time which is calculated based on the crossing of sun across the meridian. This is the calculation of time with respect the position of sun in the sky. The mean solar day is defined as the period where the earth makes the rotation on the axis of earth. This is equal to 24 hours.
This replacement is not used now.
These are now replaced by atomic clocks. Because, 1 second is defined as the 9,192,631,770 cycles of a Cesium - 133 atomic clock.