A light bulb uses 40.0 W of power when connected to a 110 V (DC) outlet. If the
same bulb is connected to a European
220 V outlet, how much power will the
bulb use?
(Hint: What is the resistance of the
bulb?)
(Unit = W)

Awave has a wavelength of 7 mm and a frequency of 19 hertz. what is its speed?

While strolling downtown on a saturday afternoon, you stumble across an old car show. as you are walking along an alley toward a main street, you glimpse a particularly stylish alpha romeo pass by. tall buildings on either side of the alley obscure your view, so you see the car only as it passes between the buildings. thinking back to your physics class, you realize that you can calculate the car's acceleration. you estimate the width of the alleyway between the two buildings to be 6 m. the car was in view for 0.6 s. you also heard the engine rev when the car started from a red light, so you know the alpha romeo started from rest 4 s before you first saw it. find the magnitude of its acceleration.

The molecular weight of oxygen gas (o2) is 32 while that of hydrogen gas (h2) is 2. prove that under same physical conditions, the velocity of sound in hydrogen is four times that in oxygen