2. A system consists of two objects that collide in a partially elastic collisio
ID: 1397616 • Letter: 2
Question
2.
A system consists of two objects that collide in a partially elastic collision. Which two properties of the system are conserved by the collision?
momentum and kinetic energy
mass and kinetic energy
momentum and mechanical energy
momentum and mass
3.
cycloid
parabola
circular arc
hyperbola
4.
As a train approaches a farm house at 30.0 m/s, the train engineer sounds the 800-Hz whistle. The air is still and the speed of sound is 340 m/s. What frequency will a person inside the farmhouse hear? Assume that the angle between the farmhouse and the train is negligible.
871 Hz
735 Hz
877 Hz
883 Hz
5.
Two loudspeakers are placed 4.5 m apart. They produce the same sounds, in step, across a frequency range of 744 Hz to 992Hz Point P is located 5.30m from one loudspeaker and 3.60m from the other. What frequency of sound from the two speakers will produce destructive interference at point P? Assume the speed of sound is 344m/s.
911 Hz
890 Hz
931 Hz
971 Hz
951 Hz
2.
A system consists of two objects that collide in a partially elastic collision. Which two properties of the system are conserved by the collision?
momentum and kinetic energy
mass and kinetic energy
momentum and mechanical energy
momentum and mass
Explanation / Answer
answer
part 2 )
momentum and mass
part 3 ) parabola
part 4 ) by doppler effect
f' = f*(v/v-vs)
f' = 800 * (340/340-30)
f' = 877 Hz
part 5 )
dl = v/2f * (1+2n)
f = v/2dl * (1+2n)
f = 911 Hz for n = 4
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