Question

What is called velocity?​

Answer 1

Answer

The time average of the velocity of a fluid at a fixed point, over a somewhat arbitrary time interval T counted from some fixed time t0. For example, the mean velocity of the u component is. The time average of any other quantity can be defined in this manner.

YellowVine❤

Answer 2

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ᴛʜᴇ ᴍᴇᴀɴɪɴɢ ᴏꜰ ᴠᴇʟᴏᴄɪᴛʏ ᴏꜰ ᴀɴ ᴏʙᴊᴇᴄᴛ ᴄᴀɴ ʙᴇ ᴅᴇꜰɪɴᴇᴅ ᴀꜱ ᴛʜᴇ ʀᴀᴛᴇ ᴏꜰ ᴄʜᴀɴɢᴇ ᴏꜰ ᴛʜᴇ ᴏʙᴊᴇᴄᴛ'ꜱ ᴘᴏꜱɪᴛɪᴏɴ ᴡɪᴛʜ ʀᴇꜱᴘᴇᴄᴛ ᴛᴏ ᴀ ꜰʀᴀᴍᴇ ᴏꜰ ʀᴇꜰᴇʀᴇɴᴄᴇ ᴀɴᴅ ᴛɪᴍᴇ. ... ɪᴛ ɪꜱ ᴀ ᴠᴇᴄᴛᴏʀ Qᴜᴀɴᴛɪᴛʏ, ᴡʜɪᴄʜ ᴍᴇᴀɴꜱ ᴡᴇ ɴᴇᴇᴅ ʙᴏᴛʜ ᴍᴀɢɴɪᴛᴜᴅᴇ (ꜱᴘᴇᴇᴅ) ᴀɴᴅ ᴅɪʀᴇᴄᴛɪᴏɴ ᴛᴏ ᴅᴇꜰɪɴᴇ ᴠᴇʟᴏᴄɪᴛʏ. ᴛʜᴇ ꜱɪ ᴜɴɪᴛ ᴏꜰ ɪᴛ ɪꜱ ᴍᴇᴛᴇʀ ᴘᴇʀ ꜱᴇᴄᴏɴᴅ (ᴍꜱ-1).

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1) ʀᴇᴠᴏʟᴜᴛɪᴏɴ ᴏꜰ ᴇᴀʀᴛʜ ᴀʀᴏᴜɴᴅ ᴛʜᴇ ꜱᴜɴ.

2) ʀᴇᴠᴏʟᴜᴛɪᴏɴ ᴏꜰ ᴍᴏᴏɴ ᴀʀᴏᴜɴᴅ ᴛʜᴇ ᴇᴀʀᴛʜ.

3) ᴠᴇʟᴏᴄɪᴛʏ ᴏꜰ ᴀ ꜱᴀᴛᴇʟʟɪᴛᴇ ᴀʀᴏᴜɴᴅ ᴛʜᴇ ᴇᴀʀᴛʜ.

4) ᴠᴇʟᴏᴄɪᴛʏ ᴏꜰ ᴀ ᴄᴀʀ ᴡʜɪʟᴇ ᴅʀɪᴠɪɴɢ.