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प्रश्न
The basic unit of speed is ______.
विकल्प
km/min
m/min
km/h
m/s
उत्तर
The basic unit of speed is m/s.
Explanation:
In the International System of Units (SI), the basic unit of speed is meters per second (m/s), which measures the distance travelled in meters over one second.
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संबंधित प्रश्न
Fill in the blank.
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Assertion (A): The SI system of units is the improved system of units for measurement.
Reason (R): The SI unit of mass is the kilogram.
Assertion (A): The skill of estimation is important for all of us in our daily life.
Reason (R): The skill of estimation reduces our consumption of time.
You can make your own sundial and use it to mark the time of the day at your place. First of all, find the latitude of your city with the help of an atlas. Cut out a triangular piece of cardboard such that its one angle is equal to the latitude of your place and the angle opposite to it is a right angle. Fix this piece, called gnomon, vertically along a diameter of a circular board a shown in Figure One way to fix the gnomon could be to make a groove along a diameter on the circular board.
Next, select an open space, which receives sunlight for most of the day. Mark a line on the ground along the North-South direction. Place the sundial in the sun as shown in Figure Mark the position of the tip of the shadow of the gnomon on the circular board as early in the day as possible, say 8:00 AM. Mark the position of the tip of the shadow every hour throughout the day. Draw lines to connect each point marked by you with the centre of the base of the gnomon as shown in Figure Extend the lines on the circular board up to its periphery. You can use this sundial to read the time of the day at your place. Remember that the gnomon should always be placed in the North-South direction as shown in Figure.
Make a model of a sand clock which can measure a time interval of 2 minutes.
