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1 University of Sharjah Semester: Fall 2005/06 College of Arts & Sciences Date: October 8, 2005 Department of Basic Sciences Time: 11:10 – 12:00 Physics for Medical Sciences (0214116) Examination I (B) Name:……………………… ID number :……………. Faculty: Section: Instructor: Dr. B. Suleiman Dr. N. Jisrawi Dr. H. Elmehdi Question 1 Question 2 Question 3 Total Mark Assigned 5 10 10 25 Mark Obtained Please read the following instructions carefully : a) The test is made up of 3 questions and 6 pages including this page and the formula sheet. b) In part one, answer only 5 questions. If more questions are answered, only the first 5 will be counted. c) Calculators are allowed d) Mobiles must be turned off and put away! 1 2 51 52 53 54 55 56 Pharmacy Dentistry Medicine

Transcript of TestI%28Fall06%29

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University of Sharjah Semester: Fall 2005/06 College of Arts & Sciences Date: October 8, 2005 Department of Basic Sciences Time: 11:10 – 12:00

Physics for Medical Sciences (0214116)

Examination I (B)

Name:……………………… ID number :……………. Faculty: Section:

Instructor: Dr. B. Suleiman Dr. N. Jisrawi Dr. H. Elmehdi

Question 1

Question 2

Question 3 Total

Mark Assigned 5 10 10 25

Mark Obtained

Please read the following instructions carefully:

a) The test is made up of 3 questions and 6 pages including this page and the formula sheet.

b) In part one, answer only 5 questions. If more questions are answered, only the first 5 will be counted.

c) Calculators are allowed d) Mobiles must be turned off and put away!

1 2 51 52 53 54 55 56

Pharmacy Dentistry Medicine

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A

B C

D

E

Answer only 5 questions (1 mark per question): 1) A particle travels along a curved path between two points P and Q as shown. The displacement of the particle does not depend on (a) the location of P. (b) the location of Q. (c) the distance traveled from P to Q. (d) the shortest distance between P and Q. (e) the direction of Q from P. 2) A racecar, traveling at constant speed, makes one lap around a circular track of radius r in a time t. Determine the magnitude of the average velocity of the car for one complete lap.

2( ) ( )

2 2( ) ( ) ( )

ra b

t tr r

c d e zerot t

π

π

3) In which one of the following situations does the car have a westward acceleration? (a) The car travels westward at constant speed. (b) The car travels eastward and speeds up. (c) The car travels westward and slows down. (d) The car travels eastward and slows down. (e) The car starts from rest and moves toward the east. 4) A ball is thrown vertically upward from the surface of the earth. Consider the following quantities: (1) the speed of the ball; (2) the velocity of the ball; (3) the acceleration of the ball. Which of these is (are) zero when the ball has reached the maximum height? (a) 1 only (c) 1 and 2 (e) 1, 2, and 3 (b) 2 only (d) 1 and 3 5) An object is moving along a straight line. The graph shows the object’s position from the starting point as a function of time. In which segments of the graph does the object have the highest velocity? 1 2 3 4 5 6 time (sec)

P

Q

20

40

Position (m)

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A •

(a) AB (c) CD (e) AB and CD (b) BC (d) DE 6) A tennis ball is thrown upward at an angle from point A. It follows a parabolic trajectory and hits the ground at point D. At the instant shown, the ball is at point B. Point C represents the highest position of the ball above the ground. Which statement is true concerning the ball when it is at C, the highest point in its trajectory? (a) The ball’s velocity and acceleration are both zero. (b) The ball’s velocity is perpendicular to its acceleration. (c) The ball’s velocity is not zero, but its acceleration is zero. (d) The ball’s velocity is zero, but its acceleration is not zero. (e) The horizontal and vertical components of the ball’s velocity are equal. 7) For a biological sample in a 1.0-m radius centrifuge to have a centripetal acceleration of 25g, (g = 9.8 m/s2) its speed must be: (a) 11 m/s (b) 16 m/s (c) 50 m/s (d) 122 m/s (e) 245 m/s

B

C

D

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Question #2: (10 marks) For the vectors shown in the diagram below find: a. The magnitude and direction of the resultant of 2B - C+ (1/2) A (6 marks) b. Find B•C (2 marks)

y-ax

is

AB

C

x-axis

C. If a car started its motion with a velocity ˆ240 j m/s, 2 minutes later the velocity was

found to be ˆ ˆ(60 360 )i j+ m/s. what is the car’s average acceleration? (2 marks)

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�0

Question 3:

a) A dentistry student is running with a constant acceleration until she reached a max speed of 5m/s. If she suddenly sees a wall 20 m in front of her, how long will it take her to come to a complete stop just before she reaches the wall, what was her acceleration? (4marks)

b) If the same student decided to check what is behind the wall by stepping 5 meters back and throwing a rock so that just clears the 2-m high wall. What should be the initial velocity (magnitude and direction) by which she must throw the rock, so that it just clears the wall at its max height of trajectory? (6 marks)

2m v0

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Formula Sheet

0

0 0

20 0

2 20

0

0 0 0 0

0 0

20 0

2

1( )

212

2

cos sin

12

2

0x 0y

x x y y

x y

r

x vv a

t tv v at

x x v v t

x x v t at

v v a x

v v at

For projectile motion:

v v and v v

v v v v gt

x v t y v t gt

r vv a

T r

θ θ

π

∆ ∆= =∆ ∆

= +

− = +

− = +

= + ∆= +

= == = −

= = −

− − − − − − − − − − − − − − − − − − − − − − − − − − − −

= =

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