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Engineering

The motion of an airplane is represented by velocity-time graph as shown below. The distance covered by airplane in the first 30.5 second is ________ km. [Diagram: Velocity-time graph. Velocity (m/sec) on y-axis, Time (sec) on x-axis. A trapezoidal shape from t=0 to t=40. At t=0, v=0. At t=2, v=200. From t=2 to t=10, v=200. From t=10 to t=30, v increases linearly from 200 to 400. At t=30, v=400. From t=30 to t=40, v decreases linearly from 400 to 0.]

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Given below are two statements: Statement I: Chlorine can easily combine with oxygen to form oxides; and the product has a tendency to explode. Statement II: Chemical reactivity of an element can be determined by its reaction with oxygen and halogens. In the light of the above statements, choose the correct answer from the options given below

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A metal wire of uniform mass density having length L and mass M is bent to form a semicircular arc and a particle of mass m is placed at the centre of the arc. The gravitational force on the particle by the wire is: [Diagram: Semicircular arc with mass m at center]

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