BASIC FINAL EXAM PHYSICS PHY 201-01 FALL 2017 04/252011 Name of the student. 1.

Question

BASIC FINAL EXAM PHYSICS PHY 201-01 FALL 2017 04/252011 Name of the student. 1. A merry-go-round makes 27 revolutions in a 3.3 min ride. What is its average angular speed in rad/s? a) 0.86 rad/s b) 1.86 rad/s c) 3 rad/s d) 0.086 rad/s 2. Newton's second law of motion is expressed by the equation F-ma, where Frepresents force, m is mass, and a is acceleration. What is the unit of force? a) kg m s b) (kg m) s d) kg m s 3. What is the sum of 7.0e 7.0 and B 2.0 3.0 Express your answer in terms of the unit vectors and y. C A B 9.0? 10.0y 5.0? 7.0y b) C 7.0? 4.0 d) C

Explanation / Answer

1.

w = rev/time

w = 27 rev/3.3 min

3.3 min = 3.3*60 sec = 198 sec

w = 27/198 rev/sec = 0.13636 rev/sec = 2*pi*0.13636 rad/sec

w = 0.856 rad/sec

Correct option is A.

2.

F = m*a

F = kg*(m/sec^2) = kg-m/sec^2

correct option is C

3.

C = (7 + 2)x + (7 + 3)y = 9x + 10y

correct option is A.

4.

Using force balance

Fg = Ft

Ft = 410*18

Fg = m*g

m*g = 410*18

m = 410*18/9.81 = 752.29 kg

Correct option is A.

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