Waves Practice 2
Name _________________
Date: ___________
1. The diagram below shows a wave in a string. The length of the string is 0.9 meters. The speed of
the wave in the string is 4 m/s.
a. What are the amplitude and wavelength of the wave?
b. What are the frequency and period of the wave?
c. While keeping the tension in the string the same, the frequency is reduced to 1/3rd of its
original value. On the diagram below, sketch how the wave in the string would look.
d. The frequency is returned to its original value, so that the wave appears like it did in
part a. Then the tension in the string is decreased, while the frequency remains the
same. Which diagram shows how the wave could look under these conditions? Explain.
2. The diagrams below show four different situations in which a police car (p) and an observer car
(o) are moving with different speeds relative to one another. Answer the questions about how
the siren would sound to the driver of the 2nd car.
The observer hears the siren. Rank the situations from highest observed frequencies to lowest,
indicating any ties. Explain.
3. Three lamps produce different colored light, one red, one green, and one yellow.
a. Rank the waves from highest frequency to lowest.
b. Rank the waves from highest wavelength to lowest.
c. Rank the waves from highest speed to lowest.
4. A ball of mass m falls from rest a distance D.
a. Express the time it will take to fall in terms of m, D, and fundamental constants.
b. If the distance fallen quadruples, what will happen to the time it takes to fall?
c. Express the speed of the ball after it has fallen the distance D in terms of m, D, and
fundamental constants.
d. If the distance fallen quadruples, what will happen to the speed at the end of its fall?
5. Four identical blocks slide from rest down frictionless inclines with the same height (h), but
different lengths.
a. Rank the blocks from highest acceleration to lowest.
b. Rank the blocks from highest speed at the bottom of the ramps to lowest.
c. Rank the situations from greatest work done by gravity to least.
6. The graphs below show the positions of 4 objects with respect to time.
a. Rank the objects from highest average speed to lowest.
b. Which objects are speeding up?
c. Rank the objects from greatest distance traveled to least.
7. A 3 kg mass and a 2 kg mass undergo various collisions, as shown below. In cases A, B, and C, the
masses stick together. In D, the 2 kg mass bounces back.
a.
Rank the situations
from the highest speed for the
3 kg mass after the collision to
the lowest.
b.
Rank the situations
from highest impulse on the 3
kg mass to the least.