PHYSICS EXAM 1!!!
P1.
Two persons, A and B, start from origin to a goal C. (See the figure). Person A first
walks 2.1 km to the due west and then walks 3.5 km to the direction of angle 45 degrees
to the north from the east. Person B walks straight to the goal C.
a. (5) What is the displacement vector
R
A
,1
of the first part of A’s walk in the unitvector
notation?
b. (5) What is the displacement vector
R
A
,2
of the second part of A’s walk in the unit vector
notation?
c. (5) For the person B to reach the goal by walking on a straight line, what should be the
angle
θ
(measure from the due east) of the walking direction?
d. (5) If person A walks at a constant speed
v
= 1.1 m/s for the whole path, how much
time he takes to reach the goal?
e. (5) For B to start and arrive simultaneously with A, at what speed
B
v
should he/she
walk?
Note: Do not forget correct significant figures and units.
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A car starts from rest and travels in a straight line for 12 seconds with a uniform
acceleration of 1.5 m/s
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 Spring '10
 IA
 Velocity, entire trip

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