المشاركة الأصلية كتبت بواسطة omar eid
تحية وبعد
انا حاولت المساعدة لكن الملف ما فتح عندي لاني بستخدم اوفيس 2003 اكتبي الاسئلة مباشرة
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مره اشكرك يااخ omar
هذي هي مباشرة اذا تقدر تحلها انا اتمنى انك تحلها اليوم اذا تقدر لانو مثل ماقلت قبل انو التسليم بكرا
1-calculate the absolute pressure at an ocean depth of 1000m. assume the density of seawater is 1024kg m3 and that the air above exerts a pressure of 101.3 kpa .
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2- the small piston of a hydraulic life has a cross-sectional area of 3m2,and its large piston has a cross-sectional area of 200m2. What force must be applied to the small piston for the lift to raise a load of 15.0 kn ?
(in service stations,this force is usually exerted by compressed air).
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3- aping-pong ball has a diameter of 3.80 cm and average density of 0.084 g cm3. What force is required to hold it completely submerged under water ?
------------------------------------------------------------------------------------------------------------------------ 4-a plastic sphere floats in water with 50.0 percent of its volume submerged . this same sphere floats inglycerin with 40.0 percent of its volume submerged . determine the densities of the glycerin and the sphere?
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5- the displacement of a partical is given by the expression x (4m)cos(3(3.14)(t)+3.14).where x is in meters and t is in seconds . determine (a)the frequency and period of the motion, (b)the amplitude of the motion , (c)the phase constant , and (d)the position of the particle at t = 0.250 s ?
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6- liquid nitrogen has a boiling point of – 195.81c at atmospheric pressure . express this temperature (a)in degrees fahrenheit and (b)in kelvins ?
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7- a pair of eyeglass farmes is made of epoxy plastic . at room temperature (20.0co), the frames have circular lens holes 2.20 cm in radius . to what temperature must the frames Be heated if lenses 2.21 cm in radius are to be inserted in them? Theaverage coefficient of linear expansion for epoxy is 1.3 10-4 (co )-1 ?
8- the temperature of a silver bar rises by 10.0 o c when it absorbs 1.23 kj of energy by heat. The mass of the bar is 525 g . determine the specifi c heat of silver .
9- a 50.0 g sample of copper is at 25.0oc . if 1 200 j of energy is add to it by heat , what is the final temperature of the copper ? (the specific heat of copper is 387j kg.co.
10- a 1.50 kg iron horseshoe oinitially at 600 co is dropped into abucket containing 20 .0 kg of water at 25 .0 co . what is the final temperature ? (ignore the heat capacity the container),the specific heat of water is 4186 j kg.co, and specific heat of iron is 448 j kg.co)?