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Home Question Bank Physics Archive 2024 December 23

Physics Questions from Dec 23,2024

Browse the Physics Q&A Archive for Dec 23,2024, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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I buque se encuentra en cierta región del océano, donde realiza investigación que requiere conocimiento de la profundidad del mar en ese punto, para ello emite una señal de 40 m e longitud de onda y 30 Hz de frecuencia, si la señal es captada por el radar del buque segundos después, ¿qué profundidad tiene el mar en esa región? \( \begin{array}{llll}9600 \mathrm{~m} & \text { b) } 2400 \mathrm{~m} & \text { c) } 4800 \mathrm{~m} & \text { d) } 1200 \mathrm{~m}\end{array} \) n buque se encuentra en cierta región del océano, donde realiza investigación que requier conocimiento de la profundidad del mar en ese punto, para ello emite una señal de 40 m e longitud de onda y 30 Hz de frecuencia, si la señal es captada por el radar del buque segundos después, ¿qué profundidad tiene el mar en esa región? 7. Explain how water can transfer heat energy by conduction and by convection 8. State any two laboratory rules concerning electricity. A particle of mass 1.8 kg is whirled round at the end of a string 50 cm long so as to describe a horizontal circle making \( 60 \mathrm{rev} / \mathrm{min} \) how that the fixed nd of the string is a ittle less than 25 cm bove the centre of circle. Example 9.9 A stone of mass 100 g is projected vertically upwards with a velocity of \( 20 \mathrm{~m} / \mathrm{s} \) Find the gravitational P.E at the maximum height reached by the stone. (Tak \( \mathrm{g}=10 \mathrm{~m} / \mathrm{s}^{2} \) ) The biometric height at sea level is 76 cm of Hg . While at a point on a highland is 72 cm of Hg . What is the altitude of the point (take density of Hg as \( 13500 \mathrm{Hg} / \mathrm{m}^{2} \) and air denaty as 1.25 igg . (3mis) The amount of force, \( F \), needed to lift an object using a lever varies inversely as the length, \( l \), of the lever. When a 24 -inch lever is used, a force of 240 pounds is needed. How much force is needed if a 36 -inch long lever is used? A. 120 pounds B. 160 pounds C. 252 pounds D. 360 pounds Encuentre el trabajo realizado cuando una particula se mueve en el campo de fuerzas \( F=3 x^{2} ;+(2 x z-y) j+z k \) a lo largo \( c \) de la cuna en el espacio \( x=2 t^{2} \quad y=t \quad z=4 t^{2} \), wando \( +E[0,1] \) Encuentre el trabajo realizado cuando una particula se mueve en el campo de fuerzas \( F=3 x^{2} i+(2 x z-y) j+z k \) a lo bigo \( C \) de la curva en el espacio \( x=2 t^{2} \quad y=t \quad z=4 t^{2} \), cuando \( +E[0,1] \) Free fall questions A ball is thrown directly downward, with an initial speed of \( 8.00 \mathrm{~m} / \mathrm{s} \), from a height of 30.0 m . After what time interval does the ball strike the ground? At \( t=0 \), a stone is dropped from the top of a cliff above a lake. Another stone is thrown downwar 1.6 s later from the same point with an initial speed of \( 32 \mathrm{~m} / \mathrm{s} \). Both stones hit the water at th same instant. Find the height of the cliff. A hoodlum throws a stone vertically downward with an initial speed of \( 12.0 \mathrm{~m} / \mathrm{s} \) from the roof of a building, 30.0 m above the ground. How long does it take the stone to reach the ground and What is the speed of the stone at impact respectively. An object is dropped from rest at a height of 120 m . Find the distance it falls during its final second in the air. A freely falling object requires 1.50 s to travel the last 30.0 m before it hits the ground. From what height above the ground did it fall? A ball is thrown directly downward, with an initial speed of \( 8.00 \mathrm{~m} / \mathrm{s} \), from a height of 30.0 m . Afte what time interval does the ball strike the ground? A stone is dropped into a river from a bridge 43.9 m above the water. Another stone is thrown vertically down 1.00 s after the first is dropped. The stones strike the water at the same time. What is the initial speed of the second stone? A bolt is dropped from a bridge under construction, falling 90 m to the valley below the bridge. (a) In how much time does it pass through the last \( 20 \% \) of its fall? What is its speed (b) when it begins tho last \( 20 \% \) of its fall and (c) when it reaches the valley beneath the bridge?
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