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Home Question Bank Physics Archive 2025 January 21

Physics Questions from Jan 21,2025

Browse the Physics Q&A Archive for Jan 21,2025, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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D'après Brevet, Métropole, juin 2017 La distance de freinage d'un véhicule dépend de sa vitesse et de l'état de la route. On peut la calculer à l'aide de la formule où est la distance de freinage en la vitesse du véhicule en et le coefficient dépendant de l'état de la route. Sur route mouillée, . Sur route sèche, . 1. Quelle est la distance de freinage d'un véhicule roulant à sur route mouillée? 2. Quelle est la distance de freinage d'un véhicule roulant à sur route sèche? 1. Цепь состоит из двух последовательно соединенных резисторо Упражнение 17 сопротивлениями 4 Ом и 12 Ом. Сила тока в первом резисторе равн 1,2 А. Каково напряжение на каждом резисторе и общее напряжение? (Omeem: 4,8 B; 14,4 B; 19,2 9) You are planning a bicycle trip for which you want to average . You cover the first half of the trip at an average speed of . What must your average speed be in the second half of the trip to meet your goal? 10) You have 6.0 hours to travel a distance of 140 km by bicycle. How long will it take you to travel the first half at an average speed of ? In the second half of the ride, you need to increase your average speed to make up for lost time. If you can maintain an average speed of , will you be able to reach your destination on time? What is the average speed you need to maintain in the second half of the bike ride to make up for lost time? If light travels at , how long will it take light from the Sun to reach a planet that is 6.45 light years away? yr How far will the light have traveled in meters? (Use a value of exactly days for a year.) 2. Два заряда по Кл, разделенные слоем слюды, взаимо- действуют с силой . Определите толщину слоя слюды, если её диэлектрическая проницаемость равна 8 . State two situations for which friction is considere to be: desirable undesirable State the mathematical relationship between the maximum height reached by an oblique projectile and its time of flight . [1 mark] A body is projected with a speed of to attain a maximum range. Calculate its velocity at the highest point. marks Part III. Workout Items 1. A projectile is fired with sec, upward from the level ground assuming , calculate, (4pts). a. The equation of ies trajectory b. Time of flight c. Maximum horizontal and verical displacements' magnitudes d. The position vector of the projectile after 3 seconds 7. a) A bullet is fired horizontally at a speed of from a point 1.5 m above the ground. The bullet misses its target and hits the ground some distance away. i) For how many seconds is the ball in the air. ii) Determine the maximum horizontal displacement. A ball is hit with an initial speed of at an angle of . Calculate i) the time the ball reaches the highest point of its flight. ii) the maximum height iii) The range. 6. A car is traveling east at when it turns due north and accelerates to , all during a time of 6.00 s. Calculate the magnitude of the car's average acceleration.
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