A 100. gram steel bullet moves at 250. m/s just before imbedding itself into a thick anchored wood post. If 40.% of the initial kinetic energy goes into heating the bullet (steel c = 460.J/kg-C):
(a) how hot does the bullet become if it initially is at 25.°C?
(b) what would be the bullet's temperature if it had been twice as massive ( 2 times 100. grams)?
(a) 52.°C
(b) 52.°C
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Sunspots
a. are cooler than their surroundings. b. are regions where material is rising from below the photosphere. c. are the result of convection. d. produce spicules. e. are generally found near the poles of the Sun during sunspot maximum.
The mass of a sulfur atom is 32.0 u, and the mass of a fluorine atom is 19.0 u. What is the mass of a mole of sulfur hexafluoride (UF6)?
a. 41.0 g b. 20.5 g c. 106 g d. 146 g e. 211 g
What element is found in all life on Earth?
a. hydrogen b. iron c. carbon d. oxygen e. nitrogen
Energy Conservation With Conservative Forces: A 1500-kg car moving at 25 m/s hits an initially uncompressed horizontal ideal spring with spring constant (force constant) of 2.0 × 106 N/m. What is the maximum distance the spring compresses?
A. 0.17 m B. 0.34 m C. 0.51 m D. 0.68 m