If we use 67 W of power to heat 148 g of water, how long will it take to raise the temperature of the water from 15°C to 25°C? The specific heat of water is 4190 J/kg•K
A) 22 s B) 5.3 s C) 114 h D) 93 s
D
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The Copernican system was no more accurate than the Ptolemaic system in predicting the positions of the planets because ___________just as in the Ptolemaic system
a. the Copernican system assumed the Earth was at rest at the center b. the Copernican system used elliptical planetary orbits c. the Copernican system used uniform circular motion d. the Copernican system assumed all planets orbited the Sun
The electrons are quantized in an atom. That means
A. the electrons are in bulk. B. the quantity of electrons keeps changing. C. the electrons can stay only in specific orbits. D. All of these choices are correct.
Why are supernova explosions important for our existence?
A. They liberate from the star's core the heavy elements of which we and Earth are made. B. They destroy wandering stars that might otherwise collide with our Sun. C. They heat the interstellar medium and help keep Earth warm. D. They sterilized the young Earth and allowed life to originate by killing off competing bacteria. E. They bathe Earth in X-rays that may have helped life form.
An electron is placed in a uniform electric field of 4.5 × 104 N/C that points to the right. (e = 1.6 × 10-19 C, melectron = 9.11 × 10-31 kg)
(a) What are the magnitude and direction of the force on the electron? (b) If the electron is released from rest, what is its speed after 3.0 ps?