Gulf Of Sidra University
Physics ( ii ) Final exam.
Faculty of health Science
First Year, 2022-2023
Applied Science preparatory Department
Date: 30/11/2023 - Time:2:00 h
-------------------------------------------------------------------------------------------------------------------------------‫ممنوع إستعارة آلة حاسبة‬
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‫ النقال في وضع إطفاء‬:‫عفوا‬
Q1/ The density of mammals is roughly the same as that of water. Find the volume of a 250-kg lion.
Q2/An oak beam 10 cm by 20 cm by 4 m has a mass of 58 kg. Find the density and specific gravity of oak.
Q3/A 65-kg woman balances on the heel of her right shoe, which has a circular base 1 cm in radius. How much
pressure does she exert on the ground?
Q4/The interior of a submarine located at a depth of 50 m in seawater is maintained at sea-level atmospheric
pressure. Find the force acting on a window 20 cm square. The density of seawater is 1.03 × 103 kg/m3 .
Q5/What is the pressure at the bottom of a swimming pool 6 ft deep that is filled with freshwater? Express the
answer in pounds per square inch.
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Q6/ A garden hose has an inside diameter of 12 mm, and water flows through it at 2.5 m/s. (a) What nozzle diameter
is needed for the water to emerge at 10 m/s? (b) At what rate does water leave the nozzle?
Q7/Water emerges horizontally at 10 m/s from the nozzle of a hose held 1.2 m above the ground. How far away
does the water stream reach?
Q8/An airplane whose mass is 40,000 kg and whose total wing area is 120 m2 is in level flight. What is the difference
in pressure between the upper and lower surfaces of its wings?
Q9/At what velocity does water emerge from an orifice in a tank (a) in which the gauge pressure is 3×105 Pa and (b)
in which the gauge pressure is 40 lb/in.2 (dwater = 103 kg/m3 = 1.94 slugs/ft3 )?
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Q10/How much heat must be added to 3 kg of water to raise its temperature from 20 to 80◦C?
Q11/A total of 0.8 kg of water at 20◦C is placed in a 1.2-kW electric kettle. How long a time is needed to raise the
temperature of the water to 100◦C?
Q12/Three pounds of water at 100◦F is added to 5 lb of water at 40◦F. What is the final temperature of the mixture?
Q13/How much heat must be added to 200 lb of lead at 70◦F to cause it to melt? The specific heat capacity of lead is
0.03 Btu/(lb· ◦F), it melts at 626◦F, and its heat of fusion is 10.6 Btu/lb.
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Atmospheric pressure = 1 atm = 1 Bar =105 pa = 14.7 lb/in2
The density of sea water = 1030 kg/m3
,, The weight density of fresh water ( dg ) = 62 lb/in3
,, 1 foot = 12 inch ,, 1 m = 100 cm ,, 1m2 = 104 cm2 ,, 1m3 = 106 cm3
1 ft2 = 144 in2 ,, 1ft3 = 1728 in3 ,, [ specific heat capacity for water ( C = 4.185 kj/kg.oC = 1 Btu/lb.oF ]