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NEET-XII-Physics

05: Newton's Laws of Motion

with Solutions -
Qstn# i-8-a Prvs-QstnNext-Qstn
  • #8-a
    What is the reading of the balance? (b) Will the reading change if the balance is heavy, say 2.0 kg? (c) What will happen if the spring is light but the blocks have unequal masses? (b) Will the reading change if the balance is heavy, say 2.0 kg? (c) What will happen if the spring is light but the blocks have unequal masses? (b) Will the reading change if the balance is heavy, say 2.0 kg? (c) What will happen if the spring is light but the blocks have unequal masses?
    Ans :
    The reading of the balance = Tension in the string
    And tension in the string = 20g
    So, the reading of the balance = 20g = 200 N (b) If the balance is heavy, the reading will not change because the weight of spring balance does not affect the tension in the string. (c) If the blocks have unequal masses, the spring balance will accelerate towards the heavy block with an acceleration a. Then the reading will be equal to the tension in the string.
    Suppose m1 > m2.
    Then tension in the string,
    `` T=\frac{2{m}_{1}{m}_{2}g}{{m}_{1}+{m}_{2}}`` (b) If the balance is heavy, the reading will not change because the weight of spring balance does not affect the tension in the string. (c) If the blocks have unequal masses, the spring balance will accelerate towards the heavy block with an acceleration a. Then the reading will be equal to the tension in the string.
    Suppose m1 > m2.
    Then tension in the string,
    `` T=\frac{2{m}_{1}{m}_{2}g}{{m}_{1}+{m}_{2}}`` (b) If the balance is heavy, the reading will not change because the weight of spring balance does not affect the tension in the string. (c) If the blocks have unequal masses, the spring balance will accelerate towards the heavy block with an acceleration a. Then the reading will be equal to the tension in the string.
    Suppose m1 > m2.
    Then tension in the string,
    `` T=\frac{2{m}_{1}{m}_{2}g}{{m}_{1}+{m}_{2}}``
  • #8-b
    Will the reading change if the balance is heavy, say 2.0 kg?
    Ans : If the balance is heavy, the reading will not change because the weight of spring balance does not affect the tension in the string.
  • #8-c
    What will happen if the spring is light but the blocks have unequal masses?
    Ans : If the blocks have unequal masses, the spring balance will accelerate towards the heavy block with an acceleration a. Then the reading will be equal to the tension in the string.
    Suppose m1 > m2.
    Then tension in the string,
    `` T=\frac{2{m}_{1}{m}_{2}g}{{m}_{1}+{m}_{2}}``