Huge collections of stars in space containing anywhere form a few hundred million to more than a trillion stars are referred to as
A) island universes
B) galaxy clusters
C) star clusters
D) galaxies
A
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What gets left behind in the middle of a planetary nebula?
A.) A newborn star. B.) A white dwarf. C.) A neutron star. D.) A black hole. E.) None of the above.
An organ pipe that is 1.75 m long and open at both ends produces sound of frequency 303 Hz when resonating in its second overtone. What is the speed of sound in the room?
What will be an ideal response?
Two long straight wires carry currents perpendicular to the xy plane. One carries a current of 50 A and passes through the point x = 5.0 cm on the x axis. The second wire has a current of 80 A and passes through the point y = 4.0 cm on the y axis. What is the magnitude of the resulting magnetic field at the origin?
a. 200 ?T b. 600 ?T c. 450 ?T d. 300 ?T e. 400 ?T
The power rating of a 400-? resistor is 0.25 W. What is the maximum voltage you can safely connect across its ends?
A) 10 V B) 20 V C) 30 V D) 40 V E) 50 V