At what temperature is the rms speed of hydrogen molecules, H2, which have a molecular weight of 2.02 g/mole, equal to 2.0 km/s? The Boltzmann constant is 1.38 × 10-23 J/K and NA = 6.022 × 1023 molecules/mol
A) 17°C B) 51°C C) 68°C D) 72°C E) 34°C
B
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The ____________________ theory describes pulsars as rotating neutron stars with strong magnetic fields that confine high speed charged particles in two beams emanating from the magnetic poles of the neutron star
Fill in the blank(s) with correct word
A steel cable spanning a river is 200.000 m long when the temperature is 20.°C. What will be its length when the temperature drops to 0°C? (The coefficient of thermal expansion of steel is 12. × 10-6K-1.)
What will be an ideal response?
You are in distant space, where there is no gravity. You hold two blocks of metal. They look and feel identical when touched, but you been informed that one is made of lightweight aluminum and the other of lead
Can you determine which one is lead without doing any kind of chemical analysis? A) You can determine this by dropping them; the lead ball will fall fastest. B) You can determine this by dropping them; the aluminum ball will fall fastest. C) You can determine this, by tapping each block with your finger; the one that accelerates the most is aluminum. D) You can determine this by giving each block a tap with your finger; the one that accelerates the most is the lead. E) The above methods will not work.
A styrofoam container used as a picnic cooler contains a block of ice at 0°C. If 225 grams of ice melts in 1 hour, how much heat energy per second is passing through the walls of the container? (The heat of fusion of ice is 3.33 × 10^5 J/kg)