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Home Question Bank Physics Archive 2024 December 18

Physics Questions from Dec 18,2024

Browse the Physics Q&A Archive for Dec 18,2024, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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Callisto is one of the moons orbiting the planet Jupiter. Callisto's mean distance from Jupiter is about \( 1,882,700 \) meters. Which of the following expresses this distance using scientific notation? \( 1.8827 \times 10^{7} \mathrm{~km} \) \( 18,827 \times 10^{2} \mathrm{~km} \) \( 1.8827 \times 10^{2} \mathrm{~km} \) \( 1.8827 \times 10^{6} \mathrm{~km} \) Example 3.7 A train moving in the east direction accelerates from rest to \( 36 \mathrm{~km} / \mathrm{h} \) in 20 s . What is the average acceleration during that time interval? Given: \( \vec{v}_{i}=0, \vec{v}_{f}=36 \mathrm{~km} / \mathrm{h}, \Delta t=20 \mathrm{~s} \), Required: \( \vec{a}_{a v}= \) ? Solution: 2. You have a rock with a volume of \( 15 \mathrm{~cm}^{3} \) and a mass of 45 g . What is its density? 3. A bar measures \( 12 \mathrm{~mm} \times 20 \mathrm{~mm} \times 1 \mathrm{~m} \). It has a specific gravity of 2.78 . Determine its mass. Una zuccheriera viene riempita completamen te con 500 g di zucchero \( \left(1,6 \mathrm{~g} / \mathrm{cm}^{3}\right) \). Qual è il volume della zuccheriera? \( \quad\left[312,5 \mathrm{~cm}^{3}\right] \) Una tanica di vetro contiene \( 5 \mathrm{dm}^{3} \) di benzina, che ha la densità \( \mathrm{di} 0,734 \mathrm{~kg} / \mathrm{dm}^{3} \). Calcola la sua massa, sapendo che la tanica vuota pesa 400 g . 2) Describe the effect of wavelength and object size on the diffraction of a wave e Choisis les bonnes propositions. a. La résistance électrique \( R \) s'exprime en ampère / ohm / volt; le symbole de cette unité est \( \mathrm{V} / \mathrm{O} / \Omega \). b. Une résistance se mesure avec un ohmmètre / ampèremètre / voltmètre. c. Le dipôle utilisé pour sa résistance dans les circuits électriques porte le nom de résistant / résistor / résisteur. e Choisis les bonnes propositions. a. La résistance électrique \( R \) s'exprime en ampère / ohm / volt; le symbole de cette unité est \( \mathrm{V} / \mathrm{O} / \Omega \). b. Une résistance se mesure avec un ohmmètre / ampèremètre / voltmètre. c. Le dipôle utilisé pour sa résistance dans les circuits électriques porte le nom de résistant / résistor / résisteur. Which of the motions below is simple harmonic (I) The motion of the tyres of a moving car (II) The motion of a loaded test tube oscillating vertically (III) The beating of the heart (IV) A stone tied to a string and whirled round Circular (V) The motion of the pistons in a gasoline For a moving object, the force acting on the object yaries directiv with the objects acceleration. When a force of 45 N acts on a sertain object, the accele of the object is \( 5 \mathrm{~m} / \mathrm{s}^{2} \). If the force is changed to 54 N , what will be the acceieration of the object? \( \square \mathrm{m} / \mathrm{s}^{2} \)
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