If the x-component of velocity u depends only on y in a plane incompressible flow, the y-component of velocity v is:
(A) f (y)
(B) const
(C) f (x)
(D) 0
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A projectile is projected from the origin with a velocity of 10.0 m/s at an angle of 30.0 degrees above the horizontal. What is the velocity of the projectile 2.00 seconds later?
A. Vx = 8.7 m/s, Vy = -14.6 m/s B. Vx = 14.6 m/s, Vy = -5.6 m/s C. Vx = -8.7 m/s, Vy = -14.6 m/s D. Vx = -14.6 m/s, Vy = 8.7 m/s E. Vx = 5.6 m/s, Vy = -14.6 m/s
How much compressional stress builds up in a thick aluminum bar held between 2 immovable walls if the temperature increases by 20. C°? (? = 24. × 10-6 C-1, Y = 7 × 1010 N/m2)
A) 34. × 105 N/m2 B) 34. × 107 N/m2 C) 34. × 106 N/m2 D) 34. × 104 N/m2 E) 34. × 108 N/m2
When people get into a small boat it settles lower in the water and
a. the buoyant force increases as a result of more water being displaced. b. the net force on the boat again becomes zero. c. the pressure on the bottom of the boat becomes greater because it is deeper in the water. d. all of the above.
What is an inertial reference frame? It is one
a. that does not accelerate. c. that accelerates at a constant rate. b. that accelerates at a varying rate. d. in which velocities are all constant.