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In Fig. 7.49, /B\ < /A and /C\ < /D. Sho...

In Fig. 7.49, `/_B\ < /_A` and `/_C\ < /_D`. Show that `A D\ < \ B C`.

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In `ΔAOB, ∠B < ∠A ` (given)
`AO < OB` (The side opposite to the smaller angle is smaller) ... (1)
In `ΔCOD, ∠C < ∠D`
...
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In Fig. 7.21, A C\ =\ A E , A B\ =\ A D and /_B A D\ =/_E A C . Show that B C\ =\ D E .

One end of a horizontal string is attached to a vibrating blade , and the other end passes over a pulley as in Fig. 7.49 (a). A sphere of mass 2.00 kg hangs at the end of the string . The string is vibrating in its second harmonic . A container of water is raised under the sphere so that the sphere is completely submerged . In this configuration , the string vibrates in its fifth harmonic as shown in Fig . 7.49 (b). What is the radius of the sphere ?

Knowledge Check

  • Refer to Fig. 7.49 . At t = 0 , the switch is closed . Just after closing the switch, find the current through the 5 Omega resistor.

    A
    `(4)/(5) A`
    B
    `(2)/(5) A`
    C
    `(6)/(5) A`
    D
    `2 A`

  • Refer to Fig. 7.49 . Now the switch is opened after closing it for a long time. Find the total energy dissipated in the system.

    A
    `40.8 muJ`
    B
    `50.8 muJ`
    C
    `40 mu J`
    D
    None of these

  • Refer to Fig. 7.49 . Long time after closing the switch , find the current through the 5 Omega resistor.

    A
    `(4)/(5) A`
    B
    `(2)/(5) A`
    C
    `(6)/(5) A`
    D
    `(8)/(5) A`

    • Similar Questions

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    In Fig. 6.49, it is given that LM = ON and NL = MO (a) State the three pairs of equal parts in the triangles NOM and MLN. (b) Is ∆NOM ≅ ∆MLN . Give reason

    In Fig. 5.49, AB||CD, AF||ED, angleAFC = 68^(@) and angleFED = 42^(@) . Find angleEFD .

    Consider the situation shwon in Fig. 7.49 . The horizontal surface below the bigger block is smooth . The coefficient of friction between the blocks is mu . Find the minimum and maximum accelerations with which the system should move in order to keep the smaller blocks at rest with respect to the bigger block .

    In Fig. 7.48, sides AB and AC of DeltaA B C are extended to points P and Q respectively. Also, /_P B C\ \ A B .

    In Fig. 5.50, OB is perpendicular to OA and angleBOC = 49^(@) . Find angleAOD.

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