If you blow across the top of an empty soft-drink bottle, a pulse of sound travels down through the air in the bottle. at the moment the pulse reaches the bottom of the bottle, what is the correct description of the displace- ment of elements of air from their equilibrium positions and the pressure of the air at this point? (a) the displacement and pressure are both at a maximum. (b) the displacement and pressure are both at a minimum. (c) the displace- ment is zero, and the pressure is a maximum. (d) the displacement is zero, and the pressure is a minimum.

Ababy stroller is a rest on top of a hill which is 10 m high. the stroller and baby have a mass of 20 kg. what is the potential energy of the baby and stroller?

Beryl states that insulation with the smallest possible thermal conductivity is best to keep a house warm in winter, but worst for keeping a house cool in summer. sapphire insists the reverse is true: low thermal conductivity is good in the summer, but bad in the winter. which one, if either is correct? a. beryl, because low thermal conductivity results in low heat transfer. b. beryl, because low thermal conductivity results in high heat transfer. d. sapphire, because low thermal conductivity results in high heat transfer. e. neither, because low heat transfer is desirable both in summer and in winter.

An object dropped from cliff falls with a constant acceleration of 10 metre per second square find its speed of two seconds after it was dropped