All elements heavier than iron are made during supernova explosions
Indicate whether the statement is true or false
TRUE
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Two metal rods, one silver and the other gold, are attached to each other end-to-end. The free end of the silver rod is immersed in a steam chamber at 100°C, and the free end of the gold rod in an ice water bath at 0°C
The rods are both 5.0 cm long and have a square cross-section that is 2.0 cm on a side. No heat is exchanged between the rods and their surroundings, except at the ends. What is the temperature at the point where the two rods are in contact with one another? The thermal conductivity of silver is 417 W/m ? K, and that of gold is 291 W/m ? K. A) 47°C B) 39°C C) 41°C D) 59°C E) 53°C
The three stars of the Summer Triangle are
A) Antares, Arcturus, and Spica. B) Arcturus, Vega, and Algol. C) Deneb, Spica, and Vega. D) Vega, Deneb, and Altair. E) Altair, Antares, and Arcturus.
Suppose the half-life of some element is 2 days. If you purchase 10 grams of the element (which was produced in a laboratory 4 days ago), how much of this element would you have 3 days after you purchased it?
A) more than 2.5 grams but less than 5 grams B) 2.5 grams C) more than 1.25 grams but less than 2.5 grams D) 1.25 grams E) less than 1.25 grams
A toy rocket is launched vertically from ground level at time t = 0.00 s. The rocket engine provides constant upward acceleration during the burn phase
At the instant of engine burnout, the rocket has risen to 64 m and acquired an upward velocity of 60 m/s. The rocket continues to rise with insignificant air resistance in unpowered flight, reaches maximum height, and falls back to the ground. The time interval during which the rocket engine provided the upward acceleration, is closest to A) 2.1 s. B) 2.3 s. C) 1.9 s. D) 1.7 s. E) 1.5 s.