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Home Question Bank Physics Archive 2025 January 20

Physics Questions from Jan 20,2025

Browse the Physics Q&A Archive for Jan 20,2025, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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8.3 LES ONDES ÉLECTROMAGNÉTIQUES Associe chaque type d'onde électromagnétique à l'utilisation qu'on en fait. Ondes radio Réseau Wi-Fi Micro-ondes Dépistage de faux billets de banque Rayons infrarouges Éclairage de maison Lumière visible Radiographie Rayons ultraviolets Centrale nucléaire Rayons \( X \) Imagerie par résonnance magnétique Rayons gamma Télécommandes \begin{tabular}{|l|l|}\hline \( \begin{array}{l}\text { Classe les ondes électromagnétiques suivantes en ordre } \\ \text { croissant d'énergie transportée, sachant qu'elles ont la même } \\ \text { amplitude. }\end{array} \) \\ \hline Rayons infrarouges \\ \hline Micro-ondes \\ \hline\end{tabular} A rocket drifts sideways in outer space from point " \( a \) " to point " \( b^{\prime \prime} \) as shown below. The rocket is subject to no outside forces. Starting at position " \( b \) ", the rocket's engine is turned on and produces a constant thrust (force on the rocket) at right angles to the line "ab". The constant thrust is maintained until the rocket reaches a point " \( \mathrm{c}^{\prime \prime} \) in space. As the rocket moves from position" \( b^{\prime \prime} \) to position " \( c \) " its speed is: constant. continuously increasing. constant for a while and decreasing thereafter. 7) Usando a expressãa matemática para o cáulculo da aceleração da gravidade (pág 161), mastre aque a gra- ridade na Terra i, aproumadamente, \( 10 \mathrm{~m} / \mathrm{s}^{2} \). 3.73 •• Em uma partida de futebol da Copa do Mundo, José está correndo para o gol na direção norte, com velocidade de \( 8,0 \mathrm{~m} / \mathrm{s} \) em relação ao solo. Um jogador do seu time passa a bola para ele. A bola tem velocidade de \( 12,0 \mathrm{~m} / \mathrm{s} \) e se move em uma direção de \( 37,0^{\circ} \) a nordeste em relação ao solo. Quais são o módulo e a direção da velocidade da bola em relação a José? 3.73 e•• Em uma partida de futebol da Copa do Mundo, José está correndo para o gol na direção norte, com velocidade de \( 8,0 \mathrm{~m} / \mathrm{s} \) em relação ao solo. Um jogador do seu time passa a bola para ele. A bola tem velocidade de \( 12,0 \mathrm{~m} / \mathrm{s} \) e se move em uma direção de \( 37,0^{\circ} \) a nordeste em relação ao solo. Quais são o módulo e a direção da velocidade da bola em relação a José? A boy throws a steel ball straight up. Consider the motion of the ball only after it has left the boy's hand but before it touches the ground, and assume that forces exerted by the air are negligible. For these conditions, the force(s) acting on the ball is (are): a downward force of gravity along with a steadily decreasing upward force. a steadily decreasing upward force from the moment it leaves the boy's hand until it reaches its highest point, on the way down there is a steadily increasing downward force of gravity as the object gets closer to the earth. an almost constant downward force of gravity along with an upward force that steadily decreases until the ball reaches its highest point; on the way down there is only a constant downward force of gravity. none of the above. The ball falls back to ground because of its natural tendency to rest on the surface of the earth. A large truck collides head-on with a small compact car. During the collision: the truck exerts a greater amount of force on the car than the car exerts on the truck. the car exerts a greater amount of force on the truck than the truck exerts on the car. neither exerts a force on the other, the car gets smashed simply because it gets in the way of the truck. the truck exerts a force on the car but the car does not exert a force on the truck. the truck exerts the same amount of force on the car as the car exerts on the truck. A stone dropped from the roof of a single story building to the surface of the earth: reaches a maximum speed quite soon after release and then falls at a constant speed thereafter. speeds up as it falls because the gravitational attraction gets considerably stronger as the stone gets closer to the earth. speeds up because of an almost constant force of gravity acting upon it. falls because of the natural tendency of all objects to rest on the surface of the earth. falls because of the combined effects of the force of gravity pushing it downward and the force of the air pushing it downward. A stone dropped from the roof of a single story building to the surface of the earth: reaches a maximum speed quite soon after release and then falls at a constant speed thereafter. speeds up as it falls because the gravitational attraction gets considerably stronger as the stone gets closer to the earth. speeds up because of an almost constant force of gravity acting upon it. falls because of the combined effects of the force of gravity pushing it downward and the force of the air pushing it downward.
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