The star's color index is a quick way of determining its
A) density. B) mass. C) composition. D) temperature. E) luminosity.
D
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A transverse wave travels at 250 m/s along the z-axis. If the frequency of the periodic vibrations of the wave is 440 Hz, then what is the wavelength of the wave?
the wave is 440 Hz, then what is the wavelength of the wave? A. 21.9 cm B. 26.7 cm C. 35.7 cm D. 56.8 cm E. 73.7 cm
A 1.1kg seagull takes off from a piling along the California coast and accelerates within 0.50s to a flight speed of 7.5m/s along a horizontal path. What average power was developed by the bird’s wings as it accelerated?
A. 62W B. 8.3W C. 33W D. 250W
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Answer the following statement true (T) or false (F)
It is a well-known fact that water has a higher specific heat than iron. Now, consider equal masses of water and iron that are initially in thermal equilibrium. The same amount of heat, 30 calories, is added to each one. Which statement is true?
A) They remain in thermal equilibrium. B) They are no longer in thermal equilibrium; the iron is warmer. C) They are no longer in thermal equilibrium; the water is warmer. D) It is impossible to say without knowing the exact mass involved. E) It is impossible to say without knowing the exact specific heats.