Physics
Convert the following.
(a) 250 km to m
(b) 400 m2 to cm2
(c) 5000 kg to tonnes
(d) 20 cm to mm
(e) 2 solar days to seconds
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Mohan's father sells fruits and vegetables. Since Mohan has learnt about measuring mass at school, he is helping his father. He has a beam balance. Let us call the pans of the beam balance as A and B. There are known weights of 50 g, 200 g, 500 g and 1000 g at his shop.
How will Mohan weigh the following items? What will he place on pan A and pan B in each case?
(a) 1 kg of onions
(b) 250 g of ginger
(c) 750 g of apples
(d) 1 kg and 200 g of potatoes
(e) 50 g of chillies
Pushpa and her friends are competing against each other. They are running from point A to point B to see who complete the distance the fastest. However, they are getting confused as to how to record the time properly since only one of their friends has a wristwatch.
Now, answer the following questions.
(a) What will your suggestion be to Pushpa and her friends?
(b) Is there any other instrument that will be a better choice in this case?
(c) What will be the most appropriate unit for their observations?