17. The components of vector A are Ax = +2.2 and Ay = -6.9 , and the components

Question

17. The components of vector A are Ax = +2.2 and Ay = -6.9 , and the components of vector B are
given are Bx = -6.1 and By = -2.2. What is the magnitude of the vector B - A? (Points : 1)
A) 9.5
B) 6.1
C) 9.9
D) 91
E) 0.76


18. Three forces are exerted on an object placed on a tilted floor. Forces are vectors. The three
forces are directed as shown in the figure (open the midterm figures file in doc sharing). If the forces have magnitudes F1 = 1.0 N, F2 = 8.0 N and F3 = 7.0 N, where N is the standard unit of force, what is the component of the net force Fnet = F 1 + F2 + F 3 parallel to the floor? (Points : 1)
A) 2.5 N
B) 5.1 N
C) 6.0 N
D) 7.8 N


19. Vector A = -3.00 i^ + 3.00 j^ and vector B = 3.00 i ^
+ 4.00 j^. What is vector C = A + B ? (Points : 1)
A) 0.00 i^ + 3.00 j^
B) 7.00 i ^+ 7.00 j^
C) -3.00 i^ + 7.00 j^
D) 0.00 i^ + 7.00 j^
E) -3.00 i ^-3.00 j^


20. An object has a position given by r = [2.0 m + (5.00 m/s)t]i^ + [3.0 m - (2.00 m/s2)t2]j^, where
quantities are in SI units. What is the speed of the object at time t = 2.00 s? (Points : 1)
A) 6.40 m/s
B) 9.43 m/s
C) 7.00 m/s
D) 7.65 m/s
E) 13.0 m/s






22. A 7.0-kg object is acted on by two forces. One of the forces is 10.0 N acting toward the east.
Which of the following forces is the other force if the acceleration of the object is 1.0 m/s2
toward the east? (Points : 1)
A) 6.0 N east
B) 3.0 N west
C) 12 N east
D) 9.0 N west
E) 7.0 N west





24. The following four forces act on a 4.00 kg object:
F1 = 300 N east
F2 = 700 N north
F3 = 500 N west
F4 = 600 N south
What is the acceleration of the object? (Points : 1)
A) 224 N in a direction 63.4

Explanation / Answer

17.c 18. no diagram 19.D 20./B 22.B 24.D

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