A. Answer the following in not more than 20 words.
1. What is a unit of measurement?
2. Define speed and mention the SI unit of speed.
3. When is a body said to be in motion?
4. How are stopwatches different from ordinary watches?
5. What property of a pendulum made it suitable to be used in the manufacture of clocks
6. What is the time period of a pendulum?
7. Mention one factor that determines the time period of a pendulum.
8. When is a moving body said to be in uniform motion?
9. Correct the following.
(a) 90 m.
(b) 100 kgs
(c) 10 secs
(d) 50 kilos
Answers
Answer:
1 A unit of measurement is a definite magnitude of a quantity, defined and adopted by convention or by law
2speed = distance / time
S.I unit is m/s
3 when a body changes its position with respect to time and observer
4 Stopwatch is a special type of watch. it is used to calculate the time taken in a process or an activity. a stopwatch is different from other watches because in normal wristwatches, the time keeps moving whereas in stopwatches, the time starts from 00:00 and can be reset.
5 As it is used in clocks period of pendulum oscillations depend only on its length and strength of local gravity. So when you don't move your clocks it depend s only on length of pendulum
6 A pendulum is a weight suspended from a pivot so that it can swing freely. ... The time for one complete cycle, a left swing and a right swing, is called the period. The period depends on the length of the pendulum and also to a slight degree on the amplitude, the width of the pendulum's swing
7 length of pendulum
8 when a body travels equal distance in equal interval of time
9 90m
100kg
10s
50kg
Explanation:
hope it helps you.....
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1. ᴛʜᴇ ꜱᴛᴀɴᴅᴀʀᴅ ᴜɴɪᴛ ᴏꜰ ᴍᴇᴀꜱᴜʀᴇᴍᴇɴᴛ ɪꜱ ᴅᴇꜰɪɴᴇᴅ ᴀꜱ ᴀ ᴜɴɪᴛ ᴏꜰ ᴍᴇᴀꜱᴜʀᴇᴍᴇɴᴛ ᴡʜɪᴄʜ ʜᴀꜱ ᴀ ꜰɪxᴇᴅ ᴠᴀʟᴜᴇ ᴛʜᴀᴛ ᴅᴏᴇꜱ ɴᴏᴛ ᴄʜᴀɴɢᴇ ꜰʀᴏᴍ ᴩᴇʀꜱᴏɴ ᴛᴏ ᴩᴇʀꜱᴏɴ ᴏʀ ᴩʟᴀᴄᴇ ᴛᴏ ᴩʟᴀᴄᴇ.
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2. ꜱᴩᴇᴇᴅ ɪꜱ ᴅᴇꜰɪɴᴇᴅ ᴀꜱ ᴛʜᴇ ᴅɪꜱᴛᴀɴᴄᴇ ᴛʀᴀᴠᴇʟʟᴇᴅ ʙy ᴀ ʙᴏᴅy ᴩᴇʀ ᴜɴɪᴛ ᴛɪᴍᴇ. ɪᴛꜱ ꜱɪ ᴜɴɪᴛ ɪꜱ ᴍ/ꜱ.
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3. ᴀ ʙᴏᴅy ɪꜱ ꜱᴀɪᴅ ᴛᴏ ʙᴇ ɪɴ ᴀ ꜱᴛᴀᴛᴇ ᴏꜰ ᴍᴏᴛɪᴏɴ ɪꜰ ɪᴛ ᴄʜᴀɴɢᴇꜱ ɪᴛꜱ ᴩᴏꜱɪᴛɪᴏɴ ᴡɪᴛʜ ʀᴇꜱᴩᴇᴄᴛ ᴛᴏ ᴛɪᴍᴇ.
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4. ꜱᴛᴏᴩ ᴡᴀᴛᴄʜᴇꜱ ʜᴀᴠᴇ ᴛɪᴍᴇ ʟɪᴍɪᴛ ᴀɴᴅ ᴏʀᴅɪɴᴀʀy ᴡᴀᴛᴄʜᴇꜱ ꜱʜᴏᴡꜱ ʀɪɢʜᴛ ᴛɪᴍᴇ.
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5. ᴛɪᴍᴇ ᴩᴇʀɪᴏᴅ ᴏꜰ ᴛʜᴇ ᴏꜱᴄɪʟʟᴀᴛɪᴏɴ ᴏꜰ ᴩᴇɴᴅᴜʟᴜᴍ ɪꜱ ꜰɪxᴇᴅ ᴀɴᴅ ᴏꜱᴄɪʟʟᴀᴛɪᴏɴ ʀᴇᴩᴇᴀᴛꜱ ɪᴛꜱ ꜱᴇʟꜰ ᴀꜰᴛᴇʀ ᴀ ꜰɪxᴇᴅ ɪɴᴛᴇʀᴠᴀʟ ᴏꜰ ᴛɪᴍᴇ.
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6.ᴛʜᴇ ᴛɪᴍᴇ ᴛᴀᴋᴇɴ ʙy ᴀ ꜰʀᴇᴇʟy ᴏꜱᴄɪʟʟᴀᴛɪᴏɴ ᴩᴇɴᴅᴜʟᴜᴍ ᴛᴏ ᴄᴏᴍᴩʟᴇᴛᴇ ᴏɴᴇ ᴏꜱᴄɪʟʟᴀᴛɪᴏɴ ɪꜱ ᴄᴀʟʟᴇᴅ ᴛɪᴍᴇ ᴩᴇʀɪᴏᴅ. ɪᴛ ɪꜱ ɴᴜᴍᴇʀɪᴄᴀʟʟy ᴛʜᴇ ʀᴇᴄɪᴩʀᴏᴄᴀʟ ᴏꜰ ꜰʀᴇqᴜᴇɴᴄy ᴏꜰ ᴏꜱᴄɪʟʟᴀᴛɪᴏɴ.
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7. ʟᴇɴɢᴛʜ ᴏꜰ ᴛʜᴇ ᴩᴇɴᴅᴜʟᴜᴍ
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8. ɪꜰ ɪᴛꜱ ᴠᴇʟᴏᴄɪᴛy ᴄʜᴀɴɢᴇꜱ ᴡɪᴛʜ ᴇqᴜᴀʟ ᴀᴍᴏᴜɴᴛ ɪɴ ᴇqᴜᴀʟ ɪɴᴛᴇʀᴠᴀʟ ᴏꜰ ᴛɪᴍᴇ, ᴛʜᴇɴ ɪᴛ ɪꜱ ꜱᴀɪᴅ ᴛᴏ ʙᴇ ɪɴ ᴜɴɪꜰɪʀᴍ ᴍᴏᴛɪᴏɴ.
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9.(a) 90 ᴍ
(b) 100 ᴋɢ
(c) 10 ꜱ
(d) 50 ᴋɢ
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ʜᴏᴩᴇ ᴛʜɪꜱ ʜᴇʟᴩᴇᴅ yᴏᴜ❣️✌️
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ʙᴀᴅɪ ᴍᴇʜᴀɴᴀᴛ ʟᴀɢɪ ʜᴀɪ yʀʀ ʟɪᴋʜɴᴇ ᴍᴀɪ....xᴅ
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