Aweather balloon contains 12.0 m3 of hydrogen gas when it is released from a location at which the temperature is 22°c and the pressure is 101 kpa. it rises to a location where the temperature is -30°c and the pressure is 20 kpa. if the balloon is free to expand so that the pressure of the gas inside is equal to the ambient pressure, what is the new volume of the balloon?

Consider a 1000 w iron whose base plate is made of 0.5 cm thick aluminum alloy 2024-t6 (ρ = 2770 kg/m3 and cp = 875 j/kg°c). the base plate has a surface area of 0.03 m2. initially, the iron is in thermal equilibrium with the ambient air at 22°c. assuming 90% of the heat generated in the resistance wires is transferred to the plate, determine the minimum time needed for the plate temperature to reach 200°c.

Which pair of quantities includes one quantity that increases as the other decreases during simple harmonic motion?

Suppose that two objects attract each other with a gravitational force of 16 units. if the distance between the two objects is double, what is the new force of attraction between the two objects?