Suppose you want to determine the chemical composition of a distant planet or star. Which of the following will be most useful to have?
A) high angular resolution
B) high turbulence
C) a radio telescope
D) high spectral resolution
D
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Consider an RLC circuit. The impedance of the circuit increases if R increases
A) always true B) true only if XL is less than or equal to XC C) true only if XL is greater than or equal to XC D) never true
The diagram below is an H-R diagram. The line indicates the location of the main sequence. Which of the five labeled locations on the H-R diagram indicates a luminosity and temperature similar to that of a T Tauri star?
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
A particle (charge = 5.0 mC) is released from rest at a point x = 10 cm. If a 5.0-mC charge is held fixed at the origin, what is the kinetic energy of the particle after it has moved 90 cm?
a. 1.6 J b. 2.0 J c. 2.4 J d. 1.2 J e. 1.8 J