ooo Verizon LTE 8:55 AM 100% PHYS B2A PracticeTest 2.SS18.docx 32044 PHYS B2A -G

Question

ooo Verizon LTE 8:55 AM 100% PHYS B2A PracticeTest 2.SS18.docx 32044 PHYS B2A -General Physics-Mec and Heat Done Bakersfield College PHYS B2A Test 2 Fall 2017 1· The horizontal surface on which the block slides is frictionless. If F-20 N and M-5.0 kg, what is the magnitude of the resulting acceleration of the block? 2. At an instant when a 4.0-kg object has an acceleration equal to Gi- m/s, one of the two forces acting on the object is known to be a2i 22) N. Determine the magnitude of the other force acting on the object. 3. IfF-4.0 N and m 2.0 kg, what is the magnitude a of the acceleration for the block shown below? The surface is frictionless. ?

Explanation / Answer

1. F_net = m a

F + Fcos30 = m a

20 (1 + cos30) = 5 a

a = 7.5 m/s^2

2. F1 + F2 = m a

12i + 22j + F2 = 4(5i + 3j)

F2 = 8i - 10j

|F2| = sqrt(8^2 + 10^2) = 12.8 N  

Ans(B)

3. F cos40 + F = m a

4 ( 1 + cos40) = 2 a

a = 3.5 m/s^2

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