Torricelli's Law states that the velocity of efflux of a fluid through a sharp-edged hole at the bottom of a tank filled to a depth 'h' is identical to:
A.The velocity of a sound wave in that fluid.
B.The terminal velocity of the fluid.
C.The critical velocity for turbulent flow.
D.The velocity acquired by a freely falling body dropped from height 'h'.
Explanation:
Torricelli's Law is a direct application of Bernoulli's principle. It proves mathematically that the velocity of fluid exiting a small hole (efflux velocity v) is v = sqrt(2gh). This is exactly the same velocity a solid body would acquire if it fell freely under gravity from rest over the same vertical height 'h'.
Explanation:
Ammeter measures current, must be in series so same current flows through it. Low resistance minimizes circuit disturbance. Voltmeter connects in parallel. Memory aid: 'Ammeter = series (low R); Voltmeter = parallel (high R)'. Circuit connection rule frequently tested in competitive electricity sections.
Explanation:
Telescope (refracting/reflecting) makes distant objects appear nearer, magnified. Microscope for tiny near objects. Periscope uses mirrors to see over obstacles. Endoscope medical.
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