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Home Question Bank Physics Archive 2025 January 02

Physics Questions from Jan 02,2025

Browse the Physics Q&A Archive for Jan 02,2025, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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Which of the following causes coastal tides? A changes in temperature of the earth's atmosphere and oceans Bravitational attraction of the moon and sun on the earth Dariations in atmospheric pressure and weather patterns D centrifugal force from the rotation of the earth and sun - General Science Which of the following would more likely be involved in computing the wind stress on a building? A cryogenics B aerodynamics C thermodynamics D electromagnetics \( K=\frac{1}{2} v^{2} m \quad \) for \( v^{2} \) A transformer has 300 turns of wire in the rimary coil and 30 turns in the secondary oil. If the input voltage is 100 volts. What is he output voltage? Un oggetto d'oro (densità \( =19,3 \mathrm{~g} / \mathrm{cm}^{3} \) ) ha una massa di 20 g . Qual è il suo volume? 5. MaTH + Frenate In un circuito di gara, due motociclette viaggiano affiancate al tempo \( t=0 \mathrm{~s} \), la prima a una velocità di \( 165 \mathrm{~km} / \mathrm{h} \), l'altra a una velocità di \( 124 \mathrm{~km} / \mathrm{h} \). La prima moto riduce la velocità di \( 2,8 \mathrm{~m} / \mathrm{s} \) ogni secondo, la seconda di \( 1,9 \mathrm{~m} / \mathrm{s} \) ogni secondo. Scrivi la legge della velocità delle due moto, facendo riferimento ai dati del problema in esamee usando le unità del SI; quindi rappresentale nello stesso piano cartesiano. (P) An athlete launches a shot put from shoulder height. The height of the shot put, in metres, above the ground \( t \) seconds after launch, can be modelled by the following function: h(t) \( 161.7+10 t-5 t^{2} \quad t \geqslant 0 \) a Give the physical meaning of the constant term 1.7 in the context of the model. b Use the model to calculate how many seconds after launch the shot put hits the ground. c Rearrange \( \mathrm{h}(t) \) into the form \( A-B(t-C)^{2} \) and give the values of the constants \( A, B \) and \( C \). d Using your answer to part c or otherwise, find the maximum height of the shot put, and the time at which this maximum height is reached. Exercice \( n^{\circ} 05 \) s Une piste dans un plan verticale est constituée d'une parti circulaire \( A B \) et d'une partie horizontale \( B C \) tangentiellemer raccordées. \( A B \) est un quart de cercle de rayon \( r=32 \mathrm{~cm} \) et \( B C=L=25 \mathrm{~cm} \). En dessous de \( C \), à la distance \( h=15 \mathrm{cr} \) se trouve le sol. On prendra \( g=10 \mathrm{~N} / \mathrm{kg} \). Une petite sphère métallique \( (\mathrm{S}) \) de masse \( \mathrm{m}=200 \mathrm{~g} \), supposé ponctuelle est abandonnée en \( A \) sans vitesse initiale. On choisit comme état de référence des énergies potentielles \( d \) pesanteur et comme origine des altitudes le sol. \( 1- \) On néglige les frottements sur la piste \( A B C \). 1.1- En appliquant le principe de la conservation de l'énergi mécanique, calculer la vitesse de la sphère lors de son passage en \( B \) et \( C \). \( 1.2- \) Donner l'expression de la vitesse \( V_{1} \) au point I en fonction de \( r \) et \( \alpha \). La calculer pour \( \alpha=\frac{\pi}{4} \) rad. C) A uniform bar XY of mass 5.0 kg und le, sci 300 cm is suspendeu by two inextensibie Identical wres P and Q . P is attached 50 cm from the end X and Q to the contre of mass C of the bar, such that they are vertical. A mass 10.0 kg is amached to the end X of the tar. (i) Draw and label the dlagram of the arrangement. (ii) Determine the distance from the centre of mass C where another mas of 10.0 kg should be hung on the bar to keep the bar horizontal anc to make the tens on in Q four times the tension in P 2. Physics: What is Newton's second law of motion?
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