Pwaves
arrive first
s waves
arrive then
displacement
earthquake generates sound 1
waves in earth. unlike in a
gas, there are both z
longitudinal (p) and
transverse (s) sound waves in
solid. typically, the speed of s
waves is about 4.5 km/s and
that of p-waves 8.2 km/s. a
seismograph records p& s waves from an earthquake. the first p
waves arrive 3 minute before the first s waves. how far away did
the earthquake occur?
ans: 1795 km

32: from largest to smallest, this hierarchy includes eons, eras, periods, epochs, and ages.

33: answer is c

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air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.