التعليمات: أجب عن جميع األسئلة

Transcription

1 Kingdom of Saudi Arabia Ministry of higher Education Al-Imam Mohammed Bin Saud Islamic University College: Science Department: Physics المملكة العربية السعودية وزارة التعليم العالي جامعة اإلمام محمد بن سعود اإلسالمية Course Name: General Physics Course Code:101 Semester/Year: final exam / Duration: 2 houre التعليمات: أجب عن جميع األسئلة إجابتان على نفس السؤال تلغي الد رجة. تكتب اإلجابة بقلم الحبر في ورقة األسئلة. مسموح: اآللة الحاسبة. اكتب اسمك ورقمك الجامعي في المساحة المخصصة لذلك عند حاجتك لمساحة إضافية في الحل فبإمكانك استخدام ظهر الصفحات إلكمال الحل اسم الطالب الرقم اجلامعي الشعبة خاص باألستاذ السؤال األول الثاني الثالث الرابع الخامس السادس السابع الدرجة 10 الدرجة المكتسبة المجموع توقيع المدقق Page 1 of 9

2 g =9.8m/s 2 K= N.m 2 /C 2 Question 1 (10 Points): Please choose one correct answer and put it in the table below If stone fell from the top of a building (from the rest) and reached the ground after 2.5 s. What was the height of the building? A m C m B m D m 2- A ball is thrown straight upward from ground level with an initial velocity of 20m/s. At the highest point it reaches: A. The acceleration is zero C. The velocity is zero B. The velocity is 20 m/s D. The acceleration is at minimum 3- At t=0, a particle moving in xy plane with constant acceleration has velocity of υ=(3i-2j)m/s. At t=3.0s, the particle s velocity is υ =(9i+7j)m/s. The acceleration of the particle is: A. (2i+3j) m/s 2 C. (4i+3j) m/s 2 B. (2i+1.66j) m/s 2 D. (4i+1.66j) m/s 2 4- A 6 kg block initially at rest is pulled to East along a horizontal, frictionless surface by a constant horizontal force of 12 N. What is the speed of the block after it has moved 3m? A m/s C m/s Page 2 of 9

3 B m/s D m/s 5- A car is moving at 40m/s. The x component of its velocity is 30m/s. What is the y component of the velocity? A m/s C m/s B m/s D m/s 6- Consider an 80 kg man and 320 kg horse both running along a road with the same kinetic energy. The man must run: A. With the same speed as the horse. C. 4 times as fast as the horse. B. Twice as fast as the horse. D. 16 times as fast as the horse. 7- An object weighing 15 Newton is lifted from the ground to a height of 0.22 meter. The increase in the object s gravitational potential energy is approximately: A J C. 3.3 J B. B J D J 8- Two vectors A and B. If A.B= 5 where A= (3i+ 2j) m and the angle between them is 300 o. So, the magnitude B is. A m C. 3.6 m B m D m 9- The magnitude of the electric field E at a distance r from an isolated point charge q is: A. kq/r C. kq/r 3 B. kr/q D. kq/r A Skater starts from the rest on a frictionless surface. After 1 second the velocity became 3m/s; assuming that the total power was 9.8 Watt. So, the mass of the crate is: Page 3 of 9

4 A Kg C Kg B Kg D. 19.6Kg Question 2 (4 Points): The driver of a car slams on the brakes when he sees a tree blocking the road. The car slows down uniformly with a constant acceleration of (-5.6 m/s 2 ) for ( 4.20 seconds ), making straight skid marks ( 62.4 m ) long, all the way to the tree. With what speed does the car then strike (hit) the tree? Page 4 of 9

5 Question 3 (6 Points): A 0.21kg pine cone falls 14 m to the ground, with initial speed of 13 m/s. Note: Use conservative or non-conservative energy A. With what speed would the pine cone have landed if there had been no air resistance? B. Find the speed at the half distance of the path (7 m) C. Find the acceleration of the pine. Page 5 of 9

6 Question 4 (4 Points): Vector A has x and y components of -8 cm and 15cm, respectively (Ax= -8cm, Ay=15cm); vector B and y components of 13 cm and -9 cm, respectively (Bx=13.2cm, By= - 9 cm). If A B 3C 0. has x A. What are the components of C? (Cx =? and Cy =?) B. Calculate the direction (θ) of vector C. Page 6 of 9

7 Question 5 (4 Points): A car of mass 1100 Kg on a friction surface (µk = 0.2) can accelerate from the rest to a speed 30 m/s in 1 minute calculate: A. The friction force. B. The force required by the car s engine. Page 7 of 9

8 Question 6 (6 Points): A car of mass 1300Kg slides 100m down an icy slope, the slope being inclined 30 o to the horizontal. If the frictional force and air resistance are ignored A. Show the free body diagram. B. Calculate the acceleration of the car. C. Calculate the total work. Page 8 of 9

9 Question 7 (6 points): y Three point charges, q1= -3 C and q2= 5 C are arranged 0.1m 0.3m as shown in figure. q 1(-) P q 2(+) x A. Find the total electric field that the charges q1 and q2, at point P. B. Find the total electric force on q3 ( q3= 6 C) exerted y by q1 and q2. 0.1m 0.3m q 1(-) P q3(+) q 2(+) x Page 9 of 9