physics midterm 2

density mass speed distance

From the given list, choose all that are examples of scalars. scalar: magnitude and units vectors: magnitude, units, direction

a. d = sqrt ((d1)^2 + (d2)^2 ) = sqrt ((5.1)^2 + (10.1)^2) = 11.315 b. atan(d2/d1)/0.0174533 = atan(10.1/5.1)/0.0174533 = 63.208

a pedestrian walks d1 = 5.1 km east, then d2 = 10.1 km north a. what is the magnitude of the pedestrian's displacement in units of km? b. what is the direction of the pedestrian's displacement, expressed as an angle in degrees north of east?

a. no b. yes

consider how vectors are summed together. a. is it possible for two vectors of different magnitudes to add to zero? b. is it possible for three vectors of different magnitudes to add to zero?

a. 3 b. 1 c. 2,4

each part of the diagram shows two vectors, A and B. a. in which part(s) of the diagram are A*B=0? select all that apply. b. in which part(s) of the diagram are A*B > 0? Select all that apply. c. In which part(s) of the diagram are A*B<0? Select all that apply.

a. 2,3 b. 1,3 c. 3

the diagram shows four examples of the graphical addition of three vectors in the x-y plane. a. select all cases where the x component of the sum of the vectors is zero b. select all cases where the y component of the sum of vectors is zero. c. select all cases where the sum of the vectors is zero.

a. 2 b. 3 c. none d. 1 e. 1,3,4 f. 2,4

the diagram shows four vectors in the x-y plane. 1 southeast 2 north 3 east 4 northeast

a. d = L + 5L + 2L + L + L + 3L = 13L = 13 (102m) = 1326 m b. s = L = 102m

the various lines represent paths taken by different people walking in a city. all blocks are square and 102 m on a side. L = 102 m a. find the total distance traveled on path C in meters. (count blocks and multiply by L) b. find the magnitude of the displacement from start to finish on path C in meters.

a. no length and no direction

8. when two vectors are added together graphically , one can drag the vectors around (keeping the direction the same) so that the tail of one vector touches the tip of the other a. if the three vectors in the figure are added together (A+B+C), in approximately what direction will the resultant be? .

a. scalars have magnitude and no direction; vectors have a magnitude and direction; only quantity with no direction is time b. scalars have a magnitude and no direction. Vectors have a magnitude and direction c. Scalars have a magnitude and no direction. Vectors have a magnitude and direction. The only one to have a magnitude and direction is distance.

please answer the following questions regarding vector and scalar quantities. a. which one of the following is a scalar quantity? b. what information do vector quantities convey? c. which one of the following is a vector quantity?