Achild releases a helium-filled party balloon. it is filled with low-quality helium and one must make a small allowance for the weight of the balloon, so it's overall specific gravity compared to ambient air is 0.15. its initial acceleration opposite to gravity starting from rest is about: (hint: since the body is starting from rest, you can ignore drag to get the initial acceleration, but you must include buoyancy forces) a. -1 g b. -17/13 gc. -25/13 g

1in2 processor chip can be modelled as an isothermal plane wall of silicon, isothermal on both sides. the power input to the bottom of the plane wall, or the processing power of the chip, often called the thermal design power (tdp), is 100w. assume the periphery is adiabatic. the silicon is 400 microns thick. the temperature at the junction, or in this case on the bottom of the isothermal plane wall, is 85°c. what is the top surface temperature, assuming that the only mode of heat transfer is conduction