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Unformatted text preview: homework 02 RAHMAN, TARIQUE Due: Jan 30 2008, 3:00 am 1 Question 1, chap 3, sect 1. part 1 of 1 10 points Which of the following are scalar quantities, which are vector quantities? a) velocity. b) age. c) speed. d) acceleration. e) temperature. 1. Vectors: velocity. Scalars: age, tempera- ture, speed,acceleration. 2. Vectors: velocity, acceleration. Scalars: age, temperature, speed. correct 3. Vectors: velocity, acceleration, age, tem- perature, speed. 4. All are wrong. 5. Vectors: age, temperature, speed. Scalars: velocity, acceleration. Explanation: Speed is a measure of how fast something moves, measured by a unit of distance divided by a unit of time, so speed is a scalar quan- tity. Velocity is specified by describing both speed and the direction of motion, so veloc- ity is a vector quantity. Age is a measure of how long something exists, so age is a scalar quantity. Acceleration is defined as changes in velocity divided by a certain time interval. Since the velocity is a vector quantity, accel- eration is also a vector quantity. Temperature is the quantity that tells how warm or cold an object is with respect to some standard, so temperature is a scalar quantity. Question 2, chap 3, sect 2. part 1 of 1 10 points A vector of magnitude 3 CANNOT be added to a vector of magnitude 4 so that the magnitude of the resultant is 1. 5. 2. 3. 3. 0. correct 4. 1. 5. 7. Explanation: The smallest magnitude of the resultant occurs when the vectors are anti-parallel ( R = 1); the largest occurs when they are parallel ( R = 7). Therefore all listed values are possible except R = 0. Question 3, chap 3, sect 99. part 1 of 2 10 points B C A D R P The vector vector R shown in the sketch may be expressed in terms of vector A , vector B , vector C , and vector D , which are the edges of a parallelogram, as 1. vector R = vector C + vector D . 2. vector R = vector B vector A . 3. vector R = vector A vector B . 4. vector R = vector C + vector B . 5. vector R = vector A + vector D . 6. vector R = vector A vector C . 7. vector R = vector B + vector A . correct 8. vector R = vector A vector D . 9. vector R = vector D vector A . homework 02 RAHMAN, TARIQUE Due: Jan 30 2008, 3:00 am 2 10. vector R = vector B + vector D . Explanation: The solution is found by the application of the parallelogram rule of addition; the tails of the two vectors vector A and vector B are joined together and the resultant vector is the diagonal of a parallelogram formed with vector A and vector B as two of its sides....
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