Water is flowing through a V-shaped weir, which has a 30° vertex
The flow rate is 7.0 x 104 kg/s and the speed of the flow is 5.0 m/s. What is the distance from the surface of the water to the vertex?
A) 3.6 m
B) 7.2 m
C) 4.8 m
D) 9.6 m
E) 14.4 m
B
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If you punch a hole in the side of a container filled with water, in what direction does the water initially flow outward from the container?
When a car goes around a circular curve on a level road without slipping,
a. no frictional force is needed because the car simply follows the road. b. the frictional force of the road on the car increases when the car's speed decreases. c. the frictional force of the road on the car increases when the car's speed increases. d. the frictional force of the road on the car increases when the car moves to the outside of the curve. e. there is no net frictional force because the road and the car exert equal and opposite forces on each other.
A series RLC ac circuit has a capacitive reactance of 55 
and inductive reactance of 25
and a resistance of 40 
What is the phase constant of this circuit?
A. 37
B. -37
C. 53
D. -53
E. 66
Coronal holes are cooler parts of the corona from which the solar wind escapes.
Answer the following statement true (T) or false (F)