Đề kiểm tra và Đáp Án môn vật lý a2 dao Động oscillation hysics a2 test 1

A particle is in simple harmonic motion with period T.. A particle moves back and forth along the x axis from x=−xm to x=+xm, in simple harmonic motion with period T.. the ratio of the p

Department of Engineering Physics

HYSICS A2 TEST 1

Student’s name:

Student ID:

MCQ ANSWER SHEET :

Choose for each question only one correct answer and darken corresponding circle

in the following answer sheet.

1 In simple harmonic motion, the restoring force must

be proportional to the:

A amplitude

B frequency

C velocity

D displacement

2 A particle is in simple harmonic motion with period T

At time t= 0 it is at the

equilibrium point Of the following times, at which time

is it furthest from the

equilibrium point?

A 0.5T

B 0.7T

C 1T

D 1.4T

3 A particle moves back and forth along the x axis from x=−xm to x=+xm, in simple

harmonic motion with period T At time t= 0 it is at x

=+xm When t=0.75T:

A it is at x= 0 and is traveling toward x=+xm

B it is at x= 0 and is traveling toward x=−xm

C it at x=+xm and is at rest

D it is between x= 0 and x=+xm and is traveling toward x=−xm

4 A meter stick is pivoted at a point a distance a from its center and swings as a

physical pendulum Of the following values fora, which results in the shortest period

of oscillation?

A a=0.1m

B a=0.2m

C a=0.3m

D a=0.4m

* Situation for questions 5-7

Transverse waves on a string have wave speed 8.00 m/s, amplitude 0.0700 m, and

wavelength 0.320 m The waves travel in the -

x-direction, and at t = 0 the x = 0 end of

the string has its maximum upward displacement

5 Find the wave number of these waves

A 19.6rad/m

B 25rad/m

C 0.3rad/m

D 0.4rad/m

6 Write a wave function describing the wave

7 Find the transverse displacement of a particle at x =

0.360 m at time t = 0.150 s

A +4.95m

B -4.95m

C 0.07m

D -0.07m

* Situation for questions 8-12

A simple harmonic oscillator at the point x = 0 generates

a wave on a rope The

oscillator operates at a frequency of 40.0 Hz and with an amplitude of 3.00 cm The

rope has a linear mass density of 50.0 g/m and is stretched with a tension of 5.00 N

8 Determine the speed of the wave

A 1m/s

B 0.25m/s

C 0.07m/s

D 10m/s

9 Find the wavelength

A 1m

B 0.25m

C 0.07m

D 10m

10 Find the wave number

A 19.6rad/m

B 25rad/m

C 0.3rad/m

D 0.4rad/m

11 Find the maximum transverse acceleration of points

on the rope

A 1890m/s2

B 189m/s2

C 18.90m/s2

D 189cm/s2

12 A car alarm is emitting sound waves of frequency

520 Hz You are on a

motorcycle, traveling directly away from the car How fast must you be traveling if

you detect a frequency of 490 Hz?

A 1m/s

B 25m/s

C 0.7m/s

D 20m/s.* Situation for questions 13-15

A soprano and a bass are singing a duet While the soprano sings an A-sharp at 932

Hz, the bass sings an A-sharp but three octaves lower In

this concert hall, the density

of air is 1.20 kg>m3 and its bulk modulus is 1.42 * 105

Pa In order for their notes to

have the same sound intensity level, what must be

13 the ratio of the pressure amplitude of the bass to that

of the soprano?

A 1

B 0.25

C 0.07

D 10

14 the ratio of the displacement amplitude of the bass to that of the soprano?

A 2

B 3

C 8

D 10

15 What displacement amplitude does the soprano produce to sing her A-sharp at

72.0 dB?

A 1m

B 25m

C 47nm

D 10m

ĐÁP ÁN

Câu 1:

In simple harmonic motion, the restoring force must be proportional to the:

A amplitude.

B frequency.

C velocity.

D displacement.

Câu 2:

A particle is in simple harmonic motion

with period TT At time t=0t=0 it is at the

equilibrium point Of the following times,

at which time is it furthest from the

equilibrium point?

A 0.5T.

B 0.7T.

C 1T.

D 1.4T.

Câu 3:

A particle moves back and forth along

the xx axis

from x=−xmx=−xm to x=+xmx=+xm, in

simple harmonic motion with period TT

At time t=0t=0 it is at x=+xmx=+xm

When t=0.75Tt=0.75T:

A it is at x=0x=0 and is traveling

toward x=+xmx=+xm.

B it is at x=0x=0 and is traveling

C it is at x=+xmx=+xm and is at rest.

D it is

between x=0x=0 and x=+xmx=+xm and is traveling toward x=−xmx=−xm.

Câu 4:

A meter stick is pivoted at a point a

distance aa from its center and swings as

a physical pendulum Of the following

values for aa, which results in the

shortest period of oscillation?

A. a=0.1 ma=0.1m.

B. a=0.2 ma=0.2m.

D. a=0.4 ma=0.4m.

Câu 5:

Transverse waves on a string have wave speed 8.00 m/s8.00m/s, amplitude 0.0700 

m0.0700m, and wavelength 0.320 m0.320m

The waves travel in the −x−x-direction, and at t=0t=0 the x=0x=0 end of the string

has its maximum upward displacement Find the wave number of these waves.

A. 19.6 rad/m19.6rad/m.

B. 25 rad/m25rad/m.

C. 0.3 rad/m0.3rad/m.

D. 0.4 rad/m0.4rad/m.

6 Write a wave function describing the wave.

ĐÁP ÁN B

Câu 7: Find the transverse displacement of a

particle at x = 0.360 m at time t = 0.150 s A

+4.95m B -4.95m C 0.07m D -0.07m.

Câu 8: Determine the speed of the wave A 1m/s

B 0.25m/s C 0.07m/s D 10m/s.

Câu 9: Find the wavelength A 1m B 0.25m C

0.07m D 10m.

Câu 10: Find the wave number A 19.6rad/m B

25rad/m C 0.3rad/m D 0.4rad/m.

Câu 11: Find the maximum transverse acceleration

of points on the rope A 1890m/s² B 189m/s² C

18.90m/s² D 189cm/s².

Câu 12: A car alarm is emitting sound waves of

frequency 520 Hz You are on a motorcycle,

traveling directly away from the car How fast must you be traveling if you detect a frequency of 490

Hz? A 1m/s B 25m/s C 0.7m/s D 20m/s.

Câu 13: the ratio of the pressure amplitude of the

bass to that of the soprano? A 1 B 0.25 C 0.07

D 10.

Câu 14: the ratio of the displacement amplitude of

the bass to that of the soprano? A 2 B 3 C 8 D

10.

Câu 15: What displacement amplitude does the

soprano produce to sing her A-sharp at 72.0 dB? A.

1m B 25m C 47nm D 10m.