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EASTERN MEDITERENIAN UNIVERSITY

Department of Physics

2012-13 fall semester

PHYS 111 FINAL

04-01-2012 / 12:30(Assoc.Prof.Dr. zzet Sakall - Dr. Mehmet Okcan)

No Name Surname Signature

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12

12

.

0.693/

P1 P2 P3 P4 P5 P6 TOTAL

DO ALL THE PROBLEMS ----- DURATION 120 minutes

DURING THE EXAM SWITCH OFF YOUR MOBILE PHONE!!!

CALCULATORS ARE ALLOWED TO USE.

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Problem 1:

The rectangle shown in the figure has sides parallel to

x andy axes. The position vectors of two corners are

A = 10.0 m at 50.0andB =12.0 m at 30.0. Find the

lengths of sides a and b. (6 points)

a

b

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Problem 2:

A bag of cement weighting 325 Nhangs in equlibrium from

three wires as shown in the figure. Two of the wires makes

angles 1 = 60.0 and 2 = 40.0

with the horizontal.

Assuming the system is in equlibrium, find the tensions T1,T2, and T3 in the wires. (7 points)

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Problem 3:

A block of mass m=2.50 kghaving an initial speed of5 m/s

is pushed a distance x=2.20 m along a frictionless,

horizontal table by a constant applied force of magnitude

F=16.0 N directed at an angle =25.0

as shown in the

figure: Detrmine

(a) the net work done on the block by the force acting on it,

(b) the final speed of the block. (3+3 = 6 points)

F

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Problem 4:

A block of mass m = 5 kg is released from point A and slides on the frictionless track shown in the

figure. Determine (a) the block speed at points B, and C and (b) the work done by the gravitational

force on the block as it moves from point A to point C. (6 points)

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Problem 5:

(a) The small piston of a hydraulic lift has a cross sectional

area of310 m2, and its large piston has a cross sectionalarea of

20010

. What downward force of magnitude

F1 must be aplied to the small piston for the lift to raise a load

whose weight is Fg = 15000 N? (5 points)

(b) The gravitational force exerted on a solid object is

5.00 N. When the object is suspended from a spring

scale and submerged in water; the scale reads 3.50 N.

find the density of the object.

( 1000/) (5 points)

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Problem 6:

(a)A sample of radio active material contains 110atoms and has an activity of610. What is its half life? (5 points)

VARIOUS DECAY PATHWAYS Particles

Alpha Decay Beta Decay () Beta Decay () Electron Capture Gamma Decay

(b) Identify the unknown atomic mass number () and proton number () of () for the followingreactions. (5 points)

(i)

(ii)

(iii)

(iv) 2

(v)