Two harmonic waves are described by 
What is the amplitude of the resultant wave?
A. 8.0 m
B. 4.3 m
C. 6.0 m
D. 3.2 m
E. 3.0 m
Answer: D
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A cast iron pipe (L 5 12 m, weight density 5 72 kN/m3, d2 5 100 mm, and d1 5 75 mm) is lifted by a hoist. The lift points are 6 m apart. The maximum bending stress in the pipe is approximately:
(A) 28 MPa
(B) 33 MPa
(C) 47 MPa
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A 20-ton truck collides with a 1500-lb car and causes a lot of damage to the car
A) The force of collision on the truck is greater then the force of collision on the car. B) The force of collision on the truck is equal to the force of collision on the car. C) The force of collision on the truck is smaller than the of collision force on the car. D) The truck did not slow down during the collision. E) The car did not slow down during the collision.
In an inelastic collision involving an isolated system, the final total momentum is
A) exactly the same as the initial momentum. B) more than the initial momentum. C) less than the initial momentum.