Spicules can trigger communications blackouts and auroras on Earth
a. True
b. False
Indicate whether the statement is true or false
False
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A 200-g metal container, insulated on the outside, holds 100 g of water in thermal equilibrium at
A 21-g ice cube, at the melting point, is dropped into the water, and when thermal equilibrium is reached the temperature is 15.00°C. Assume there is no heat exchange with the surroundings. For water, the specific heat is 4190 J/kg · K and the heat of fusion is 3.34 × 105 J/kg. The specific heat for the metal is closest to A) 3850 J/kg ? K. B) 2730 J/kg ? K. C) 4450 J/kg ? K. D) 4950 J/kg ? K. E) 5450 J/kg ? K.
Einstein's ________ is a candidate for the dark energy that would be a repulsive force that may exist throughout space, and accelerate the expansion of the universe
Fill in the blank(s) with correct word
The distance between peaks on a wave divided by the time for the wave to travel this distance is the wave's
a. speed. b. frequency. c. wavelength. d. amplitude. e. loudness.
If an electron has the same de Broglie wavelength as the wavelength of a 390-nm photon in vacuum,
what is the speed of the electron? (melectron = 9.11 × 10-31 kg, c = 3.0 × 108 m/s, h = 6.626 × 10-34 J ? s) A) 2100 m/s B) 540 m/s C) 1900 m/s D) 1700m/s E) 1500 m/s