Which of the following combinations of circuit components can be used to make a tuner for a radio, to select the desired frequency?

a. fixed inductor, variable resistor
b. fixed resistor, variable inductor
c. fixed inductor, variable capacitor
d. fixed capacitor, variable resistor


c

Physics & Space Science

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Some narrow rings of Saturn are seen in space probe photos to be caused by

a. gravitational interactions between ring particles. b. a spiral density wave which confines them. c. the magnetic field which holds them in place. d. small shepherd moons that orbit inside and outside the rings

Physics & Space Science

At what distance could one theoretically distinguish two automobile headlights separated by 1.5 meters? Assume a pupil diameter of 0.50 cm and yellow headlights seen at the wavelength 5.0 × 10^?7 m. Assume eye fluid has an average n = 1.33

a. 6.0 km b. 12 km c. 9.0 km d. 3.0 km e. 16 km

Physics & Space Science

A binary star system in the constellation Orion has an angular separation between the two stars of 1.2 × 10^-5 radians. If l = 5 × 10^-7 m, what is the smallest aperture (diameter) telescope that may be used to resolve the two stars?

a. 10 cm b. 5 cm c. 50 cm d. 1 m e. 4 cm

Physics & Space Science

Why do we think Mercury contracted after it formed?

What will be an ideal response?

Physics & Space Science