1. This is the first midterm for a General Physics for Medical Students course taught by Dr. Hassan S. Ashour on August 5, 2007. It consists of 4 questions worth a total of 55 points. 2. Question 1 (10 points) asks students to calculate the number of square meters painted given the amount of paint used and thickness on the wall. 3. Question 2 (20 points) asks students to find the scalar product, cross product, magnitudes, and angle between two given vectors. 4. Question 3 (15 points) asks if a pivoted bar will start rotating if initially at rest and if so, in which direction. 5. Question 4 (20 points) has

1. 1
General Physics for Medic students
First Midterm
Instructor: Dr. Hassan S. Ashour
Time: 10:00-11:30, Aug 5, 2007
5 points bonus for neat answers
Answer the following questions
Q1: A Painter used 7 liters of yellow pigment to paint certain wall. If his painting
thickness on the wall is about 0.05 mm, how many square meters is the painter
paint? (10 points)
Q2. Given tow vectors kjiBandkjiA 232,52  , obtain the
following, (20 point)
1. The scalar product (dot) BA ,
2. The cross product (vector) BA ,
3. Find the magnitude of each vector,
4. The angle between the two vectors .
Q3. The bar in the figure is pivoted at point P. Will it tend to start rotating if it is
initially at rest? Explain, and indicate in which direction it would rotate if your
answer is yes. (15 point)
Q4. A 1.6m long steel piano wire has diameter of 0.20 cm. (20 point)
a. How great the tension in the wire if it stretched 0.3 cm when tightened?
b. Find the spring constant of the steel
Hint:   29
/102 mNsteelE 
 Good Luck 
Hassan Ashour