A high-voltage powerline operates at 500000 V-rms and carries an rms current of 500 A. If the resistance of the cable is 0.050?/km, what is the resistive power loss in 200 km of the powerline?
a. 250 kW
b. 500 kW
c. 1 Megawatt
d. 2.5 Megawatts
e. 250 Megawatts
d
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A series of tests in which water was heated while flowing through a 1 m-long electrically heated tube of 1.3 cm ID yielded the experimental pressure-drop data shown next.
GIVEN
Water flowing through a tube
Isothermal and nonisothermal pressure drop data given above
The dimensionless friction factor
Reynolds number
Inside tube diameter
Tube length
FIND
Dimensionless equation of the form:
SKETCH
PROPERTIES AND CONSTANTS
From Appendix 2, Table 13, for water
Consider the graph of expansion models. Which model(s) predicts that galaxies will eventually get closer together?
A) accelerating B) coasting C) critical D) recollapsing E) all of them F) none of them
A baseball infielder, mass 75.0 kg, jumps up with velocity 2.00 m/s and catches a 0.150-kg baseball moving horizontally at 50.0 m/s. Of the following, which is closest to the final momentum of the system, infielder and baseball?
a. 158 kgm/s c. 152 kgm/s b. 155 kgm/s d. 150 kgm/s
The energy released from a nuclear reaction is equal to:
a. energy associated with momentum conservation. b. the exothermic endothermy. c. energy associated with the change in mass. d. the total charge involved.