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Physics Test 135

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Physics Test 135
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  • Question 1
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    Solution

    This comes out to be dimensionless and angle is also dimensionless.

     

  • Question 2
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    Solution

     

  • Question 3
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    Solution

     

  • Question 4
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    The rate of mass of the gas emitted from rear of a rocket is initially 0.1 kg/sec. If the speed of the gas relative to the rocket is 50 m/sec and mass of the rocket is 2 kg, then the acceleration of the rocket in m/sec2 is

    Solution

     

     

  • Question 5
    4 / -1

    Water falls from a height of 60 m at the rate of 15 kg/s to operate a turbine. The losses due to frictional force are 10% of energy. How much power is generated by the turbine? (g = 10 m/s2)

    Solution

     

  • Question 6
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    From a circular ring of mass M and radius R, an arc corresponding to a 90° sector is removed. The moment of inertia of the remaining part of the ring about an axis passing through the centre of the ring and perpendicular to the plane of the ring is k times MR2. Then the value of k is

    Solution

     

  • Question 7
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    Solution

     

  • Question 8
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    An elastic string of unstretched length L and force constant k is stretched by a small length x. It is further stretched by another small length y. The work done in the second stretching is:

    Solution

  • Question 9
    4 / -1

    A thin liquid film formed between a U-shaped wire and a light slider supports a weight of  (see figure). The length of the slider is 30 cm and its weight negligible. The surface tension of the liquid film is

    Solution

     

  • Question 10
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    A rectangular block is heated from 0C to 100C. The percentage increase in its length is 0.10%. What will be the percentage increase in its volume?

    Solution

     

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