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What are the angular velocities of a sec...

What are the angular velocities of a second hand, minute hand and hour hand of a clock ?

Text Solution

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Second hand of a clocj completes one rotation in ` 60 seconds` . So ` T =60 s, theta = 2 pi ` rad.
` omega = (theta)/T = (2 pi) /(60) = (pi) /(30) rad//s `
For minute hand of a clock,
` T =60 min =60 xx 60 s = 3600 s`
` omega = (2 pi)/(3600) = (pi)/(1800) rad//s`
For hour hand of a clock,
` T = 12 h= 12 xx 60 xx 60 s`
` omega = (2 pi)/(12 xx 60 xx 60) = (pi) /(21600) rad//s`.
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Knowledge Check

  • The angular velocity of the seconds hand in a watch is

    A
    `0.053 rad//s`
    B
    `0.210 rad//s`
    C
    `0.105 rad//s`
    D
    `0.42 rad//s`
  • The angular velocity of seconds hand of a watch is

    A
    `60 pi " rad"//s `
    B
    `(pi)/(60)pi " rad"//s`
    C
    `40pi" rad"//s`
    D
    `(pi)/(30)pi" rad"//s`
  • The angular separation between the minute hand and hour hand of a clock at 12.20pm is

    A
    `120^(@)`
    B
    `90^(@)`
    C
    `110^(@)`
    D
    `100^(@)`
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