What does Hubble's law tell us?
A) The more distant a galaxy, the faster it is moving away from us.
B) The faster a spiral galaxy's rotation speed, the more luminous it is.
C) The longer the period of a Cepheid variable, the greater its luminosity.
D) For every force, there is an equal and opposite reaction force.
A) The more distant a galaxy, the faster it is moving away from us.
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The phase angle of a series RL circuit with a 20.0-mH inductor and a certain resistor at 1000 Hz is 20.0°. What is the value of the resistance in this circuit?
A) 145 ? B) 100 ? C) 245 ? D) 200 ? E) 345 ?
Which of the following represents the equipotential lines of a dipole?
a.
b.
c.
Referring to how many kilograms of ice can a 3-ton refrigeration unit produce in a 24-hour period? The heat of fusion of water is 330 kJ/kg.
GIVEN - A three-ton refrigeration unit - Heat of fusion of ice is 330 kJ/kg FIND (a) Kilograms of ice produced by the unit per 24 hour period (b) The refrigeration unit capacity is the net value, i.e., it includes heat losses ASSUMPTIONS (a) Water is cooled to just above the freezing point before entering the unit
To increase the applied torque one can
A. Increase the force B. Increase the lever arm by moving to the end of the lever C. Increase the lever arm by applying the force perpendicularly to the lever D. All of the above E. None of the above