Provides online astronomical info, such as sunrise and sunset times


Answer: United States Naval Observatory’s Astronomical Applications    

Physics & Space Science

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Reactance: A pure inductor is connected to an ac power supply. In this circuit, the current

A. leads the voltage by 90°. B. is in phase with the voltage. C. lags the voltage by 45°. D. lags the voltage by 90°. E. leads the voltage by 45°.

Physics & Space Science

A vehicle undergoes acceleration when it

A) gains speed. B) loses speed. C) changes its direction. D) all of the above

Physics & Space Science

A laser shines 630-nm light through a grating producing a first-order (m = 1) maximum at an angle of 30°. A second laser produces a first-order maximum with the same grating at 20°. What is the wavelength emitted by the second laser?

a. 945 nm b. 651 nm c. 420 nm d. 431 nm

Physics & Space Science

Consider a Carnot cycle starting at the state of highest pressure and smallest volume. Call the isothermal expansion that starts at this state step 1, the adiabatic expansion which follows step 2, the isothermal compression that then follows step 3, and the adiabatic compression which returns the system to the initial state step 4 . In which step does the entropy of the system increase?

a. 1 c. 3 b. 2 d. 4

Physics & Space Science