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which describes how fast-moving particles assist in transferring thermal energy to a cup after hot tea is poured into it?

a. they replace slow-moving particles.
b. they collide with slow-moving particles.
c. they collide with other fast-moving particles.
d. they are replaced by slow-moving particles.

Before it was launched, a helium-filled balloon had a pressure of 201 kpa at a temperature of 27°c. at an altitude of 15,000 m, the pressure had decreased to 2.5 kpa and the temperature had dropped to -14 °c. the volume of the balloon increased to 59.3 m3. what is the original volume of the balloon? 13 m3 0.85 m3 0.077 m3 1.17 m3