v (m/s) The following graph pertains to questions 11 and 12. It represents the s
ID: 1778553 • Letter: V
Question
v (m/s) The following graph pertains to questions 11 and 12. It represents the speed of the blood in the ascending aorta during one heartbeat. 1.0 Q11) Approximately how far, in cm, does the blood move s during one heartbeat? a) 2.5 b) Zero c)-2.5 d)1 e) 7.5 r (s) 0 0.20 040 .60 Q12) What is the average velocity of the blood during time interval? a) 0.13m/s b) 0.38m/s 0.75m/s d) zero e) 0.3m/s Q13) Given that the maximum force your forehead can take is about 6000N, while the maximum force your cheekbone can take is 1300N. If a 0.14 kg solid ball strikes any part of your head at 39 m/s and stops in 1.2 × 10" s, which of the following is correct: a) Only your forehead will be in danger of fraction. b) Nor your forehead neither your cheekbone will be in danger of fraction c) Only your cheekbone will be in danger of fraction. d) Both your forehead and your cheekbone will be in danger of fraction e) I cannot decide because the mass of the head is not known Q14) A typical laboratory centrifuge rotates at 4000 rev/min. What is the centripetal acceleration at a point located 10 cm from the axis of rotation of the centrifuge? a) 4.2x10 m/s c) 1.8x10 m/s d) 1.8x10' m/s e) 1.6x10 m/s? Q15) Vector A has length 4 units and directed to the north. Vector B has length 9 units and is directed to the south. Calculate the magnitude and direction of A + EB a) 13 units, south b) 13 units, north c)5 units, north d)5 units, south Midterm Exam,Fall, 13/14(Attaelmanan, Maya, Bassam) Physics for Med. Sci.Explanation / Answer
(11)
distance travelled = area under the graph
= (1/2)(b*h)
b =base , h = height
= 1/2*(0.2*0.8)
= 0.08 m = 8 cm
(13)
Only your checkbone will be in danger of friction.
(14)
angular speed w = 4000 rev/min
= 4000* 2*pi rad / 60 s
= 418.87 rad / s
distance r = 10 cm = 0.1 m
accleration at the end of the tube a = r*w^2
a = 0.1 * 418.87^2
a = 17545.96 m/s^2 = 1.8*10^4 m/s^2
(15) vector A has length along north = 4j
vector B has length along south = -9j
A+B = 4j+(-9j)
= -5j
so direction is along south direction
magnitude = 5 units.
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