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The rope with the highest tension is going to break first. The ropes must have some flexibility for it to work, allowing the ball to accelerate downwards when pulled. With slow pulling the acceleration of the ball is negligible and the balance of forces make the top rope carry a higher tension since you have to add the weight of the ball to the pulling force....

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when a person hits a broomstick, the direction of the force F applied is vertically downwards. according to 3rd law of Newton, there would be an equal and opposite reaction. so in this case the broomstick breaks into two parts, each part having a torque equal to the force F and moment arm (1/2 length of the broomstick)thus not touching the wine glasses as ...

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@PhysicsDave probably has not tried to interfere the light from two independent lasers. In fact, the two will NOT form a visible interference pattern. Their frequencies and relative phases will never have a stationary relationship (which is necessary for forming a visible interference pattern) unless the two lasers are coupled. At any instant, there will ...

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Yes there will still be an interference pattern from the 2 combined sources. Your approach would be the same as if we had combined 2 separate interference patterns from 2 sources. The separate patterns are identical because they are created with the same type of initial source, same color filter, same pinhole, distance to screen, and slit size and spacing. ...

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