1 of 20

What is the most accurate statement concerning the elastic modulus?

Elastic modulus is change in length divided by the original length of a linear material (like a wire) that results from applying a tension force to the wire.

Elastic modulus is a constant of proportionality that relates stress to strain.

Elastic modulus is a unitless number that describes the elastic region for a material under pressure.

Elastic modulus is a unitless number that describes the plastic region for a material under pressure.

It is the ratio of strain divided by stress.

Question

2 of 20

What is the most accurate statement concerning simple harmonic motion (SHM)?

Objects undergoing SHM vibrate back and forth with constant acceleration that is inversely proportional and in opposition to the displacement from the equilibrium position.

Objects undergoing SHM vibrate back and forth with constant velocity.

Objects undergoing SHM vibrate back and forth with constant acceleration that is in the same direction as the displacement of the object at any given instant of time.

SHM describes the vibrational motion of an object oscillating back and forth through an equilibrium position.

Objects that rotate and translate simultaneously are best described using the SHM model.

Question

3 of 20

What is the most accurate statement concerning an object undergoing simple harmonic motion (SHM)?

The object's acceleration is maximum as it passes the equilibrium position.

The object's velocity is maximum as it passes the equilibrium position.

The amplitude of the oscillation is directly proportional to the frequency of oscillation.

The amplitude of the oscillation is directly proportional to the period of oscillation.

The algebraic sum of the object's PE and KE is zero throughout the motion.

Question

4 of 20

What is the most accurate statement concerning bulk modulus?

Bulk modulus has units of N/m²Â or Pascal.

Bulk modulus is sometimes referred to as the incompressibility of a substance.

Bulk modulus is equal to the quotient of the applied pressure divided by the relative deformation.

Bulk modulus is a numerical constant that describes the elastic properties of a solid or fluid when it is under pressure.

All of the statements above are accurate.

Question

5 of 20

What is the most accurate statement concerning sound waves?

Sound waves are transverse waves whose wave speed is independent of the transmitting medium.

Sound waves are longitudinal waves whose wave speed depends on the transmitting medium.

Sound waves are transverse waves whose wave speed depends on the transmitting medium.

In general, sound waves travel faster in air than in water.

In general, sound waves travel faster in fluids than in solids.

Question

6 of 20

If a wave has a speed of 362 m/s and a period of 4.17 ms, its wavelength is closest to which of the following?

1.51 m

1510 m

86.8 m

86,800 m

0.0115 m

Question

7 of 20

What is the most accurate statement concerning the physical pendulum?

The period for one complete oscillation is directly proportional to the mass attached to the bottom of the pendulum.

The period for one complete oscillation is directly proportional to the length of the pendulum.

The period for one complete oscillation is directly proportional to the square root of the length of the pendulum.

The period for one complete oscillation is directly proportional to the square of the length of the pendulum.

The period for one complete oscillation is directly proportional to the square root of the mass of the pendulum.

Question

8 of 20

An 88.6-kg bungee jumper jumps off a bridge and undergoes simple harmonic motion. If the period of oscillation is 11.2 s, what is the spring constant of the bungee cord?

27.9 N/m

33.5 N/m

44.6 N/m

56.3 N/m

65.3 N/m

Question

9 of 20

An object undergoing simple harmonic motion has amplitude of 2.3 m. If the maximum velocity of the object is 15 m/s, what is the object's angular frequency?

5.8 rad/s

5.2 rad/s

6.5 rad/s

7.2 rad/s

13 rad/s

Question

10 of 20

The density of aluminum is 2,700 kg/m3. If transverse waves propagate at 38 m/s in a 4.6 mm diameter aluminum wire, what is the tension on the wire?

39 N

65 N

78 N

52 N

130 N

Question

11 of 20

A crane lifts a 2,500 kg mass using a steel cable with mass per unit length of 0.65 kg/m. What is the speed of transverse waves on this cable?

1,220 m/s

1,880 m/s

194 m/s

225 m/s

578 m/s

Question

12 of 20

A 4.0 g string, 0.39 m long, is under tension. The string produces a 600 Hz tone when it vibrates in the third harmonic. The speed of sound in air is 344 m/s. The tension in the string is closest to which of the following?

340

290

160

250

200

Question

13 of 20

Which of the following is an accurate statement?

A system like a vibrating string has only one possible frequency.

In order for a singer to break a wine glass by singing, she must adjust the amplitude of the sound she makes so that it is exactly equal to the amplitude of vibration of the wine glass.

The fundamental frequency of a system is the name given to the highest possible frequency at which the system will naturally vibrate.

The sound in an organ pipe can vibrate at an infinite number of frequencies.

The sound in an organ pipe can vibrate at a finite number of frequencies.

Question

14 of 20

A string, 0.15 m long, vibrating in the n = 5 harmonic, excites an open pipe, 0.82 m long, into second overtone resonance. The speed of sound in air is 345 m/s. The distance in mm between a node and an adjacent antinode, in the string, is closest to which of the following?

150

30

23

15

7.5

Question

15 of 20

Which of the following increases when a sound becomes louder?

Frequency

Wavelength

Amplitude

Period

Velocity

Question

16 of 20

An organ pipe closed at one end has two successive harmonics with frequencies of 2170 Hz and 2790 Hz. What is the fundamental frequency of the pipe?

1,240 Hz

520 Hz

620 Hz

260 Hz

310 Hz

Question

17 of 20

The period of a simple pendulum in a grandfather clock on another planet is 1.80 s. What is the acceleration due to gravity on this planet if the length of the pendulum is 1.00 m?

11.3 m/s²

12.2 m/s²

13.4 m/s²

14.6 m/s²

24.4 m/s²

Question

18 of 20

A simple pendulum has a period T on the Earth. 18. If it were used on Planet X, where the acceleration due to gravity is 3 times what it is on Earth, its period would be which of the following?

3T

√3T

T

T√ (1/3)

T/3

Question

19 of 20

An aluminum wire and a steel wire, each of length 2 m, are hung from the ceiling. A 5.0-kg mass is suspended from the lower end of each wire. The aluminum wire has a diameter of 2.2 mm. What must be the diameter of the steel wire if it is to stretch the same distance as the aluminum wire, so that the two wires maintain equal lengths after the masses are attached? The Young's modulus for aluminum is 0.70 E 11 Pa and for steel it is 2.0 E 11 Pa.

0.65 mm

2.1 mm

3.2 mm

1.3 mm

0.95 mm

Question

20 of 20

For an object undergoing simple harmonic motion,

the acceleration is greatest when the speed is greatest.

the displacement is greatest when the speed is greatest.

the acceleration is greatest when the displacement is greatest.

the maximum potential energy is larger than the maximum kinetic energy.

the total energy oscillates at frequency f = 1/(2π) √ (k/m)

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