4. Según la publicidad, determinado coche pequeño fota en el agua. a) Si la masa de coche es 1000kg y su volumen interior ,0 m !, "#u$ %racci&n del coche se sumerge cuando fota' (espr$ciese el empue o fotaci&n de acero y de los dem*s materiales. b) +omo el agua penetra gradualmente en el coche desplaando al aire, "#u$ %racci&n de volumen interno es agua cuando el coche se hunde'
9. -na piea de aleaci&n de oro y aluminio pesa 10lb. +uando se supone de una balana de resorte y se sumerge en agua la balana indica lb. "+u*l es el peso del oro en la aleaci&n, si la densidad relativa del oro es 1/,! y la del aluminio ,'
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14. Un bloque cubico de acero (cuya densidad es 7,8 g.cm-3) fota en mercurio (densidad13,! g.cm-3). a) "#u$ %racci&n de bloque se encuentra por encima de la super2cie del mercurio' b) Si se vierte agua sobre la super2cie del mercurio hasta que alcance ustamente la parte superior del bloque de acero, acero, "#u$ pro%undidad pro%undidad ha de tener la capa de agua'
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19. Un bloque de madera de balsa colocado sobre el "latillo de una balan#a de bra#os iguales se equilibra e$actamente con una "esa de lat%n de 1&& g colocado en el otro "latillo. (eterm3nese la masa real de la madera de balsa, si su densidad relativa es 0,1.
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'4. n un tubo en U las secciones rectas estn en relaci%n 1*+. n la rama estreca se introduce mercurio asta un "unto situado a '&cm de la boca del tubo. Si esta rama se llena totalmente de agua, determinar la altura que desciende el mercurio.
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'9. Un tubo ca"ilar est sumergido en agua con su e$tremo inerior 1&cm "or debao de la su"er/cie de la misma. l agua se ele0a en el tubo 4cm "or encima del lquido, y el ngulo de contacto es cero. "#u$ presi&n manom$trica se requiere para %ormar una burbua semies%$rica en el e4tremo in%erior del tubo'
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34. Un bloque c2bico de ierro, de arista 1&cm de densidad 7,8g*cm3, fota sobre mercurio. i se 0ierte agua sobre la su"er/cie de mercurio, "#u$ altura debe tener la capa de agua para que su super2cie alcance ustamente la cara superior del bloque de hierro'
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39.-l embolo de la /gura tiene un rea de 1&cm', "+u*l es su peso si el nivel de mercurio de la rama abierta del tubo en est* a una altura de 10cm con respecto a la base del $mbolo'
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a) "#u$ %uera debe eercer el pist&n pequeño' b) Si el auto sube 5 6 1mm, "qu$ distancia h recorre recorre el pist&n pequeño' c) "#u$ %uera 7 1 eerce una persona en el e4tremo 8 de la palanca d) #ue distancia S 1 recorre el e4tremo 8 de la palanca
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:;<=<;5>;? '. l agua alcan#a una altura : en un gran de"%sito abierto, de "aredes 0erticales. e "ractica un ori/cio en una de las "aredes a una "roundidad "or debao de la su"er/cie libre del agua. a) "9 qu$ distancia : del pie de la pared alcanar* el suelo el chorro de agua que sale por el ori2cio' b) "9 qu$ altura por encima del %ondo del dep&sito puede practicarse un segundo ori2cio para que el chorro que sale de $l tenga el mismo alcance que el anterior'
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7. @or el medidor de Aenturi Aenturi de la /gura, circula agua con un caudal constante de 1&litros*s. n el estrecamiento la secci%n trans0ersal es la tercera "arte de la secci%n en la "arte anca,
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dos corros es el mismo. i el ori/cio inerior dista 1,+m del ondo, ?alcularB a) =l alcance horiontal b) ;a distancia del ori2cio superior a la super2cie libre del l3quido.
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''. e utili#a agua como lquido manomDtrico en un tubo de @randt montado en un a0i%n "ara medir la 0elocidad del aire. i la dierencia m$ima de altura entre las columnas de lquido es de &,1m, "+u*l es la velocidad m*4ima del aire que se puede medir' ;a densidad del aire es 1,!kg.m>!.