医用物理学试?- 百度文库 ر

27. ͼʾijˮƽܣͷʾҺS1Ϊ ĺS2S3ΪϸĺS2 = S3 SlS2S3һװһˮɽιܣɽ ϶ҺɺԲƣɽιˮĸ߶ȣ

Aϸˮڴִ Bִˮϸ Cûи߶Ȳ Dˮ𽥽 Eˮߡ 28Һһϸȵˮƽȶѹǿ ˮҺͼ߶Ȳô

AҺ壬Ҵ B. Һ壬Ҵ

C. ʵҺ壬Ҵ D. ʵҺ壬Ҵ E. Ͻ۶пܳ

29Һڰ뾶ΪRvȶ˹İ뾶ΪR/3

ܽͨҺڰ뾶ΪR/3ȶΪ

Av/6 B3v/2 Cv D. v /2 E. v/3 30. ijճͨһιܰ뾶ΪrĹܵʱΪRܰ뾶һΪ

AR/2 BR/8 CR/16 D8R E. 16R 31. ѪҺѭϵͳѪҺΪ8.1410-5m3/sһεΪ1.2107pas/m3ѪѹĴС൱mmHgΪ

A976.8 pa 130 mmHg B976.8 pa 7.34 mmHg C678 pa 90.2 mmHg D1470 pa 11.1 mmHg E϶

32. һ뾶ΪrܶΪѵĿݣܶΪ' ҺٶvɼóҺճϵΪ

222222??r(????)g(?A ? ? r ( ? ? ? ? ) g B ? ? r ? ? ? ) g C

9v9v9v22D ? ? ? r ( ? ? ? ? ) g E϶

9v

5

ڶ 벨

1г񶯵˶˵ʱλxٶvٶaΪ

AxAv0a0 B xAv0aA2 CxAv0a-A2 D x AvAأa0 2һг񶯷Ϊx?12cos(t-)cmx?-6cmʼx3˶˵صƽλʱ䣺 A

3235 s B s C s Ds 43863һʵˮƽг񶯣ΪXt0ʱʵ˶λƷдx?Acos(?t??),Ϊ A

A2???2? B C D-

3633?? B 0 C D ?

24??? C _ D 2324⣬ƽλ·λƴʼ񶯣λΪ A-5⣬t0ʱx00v00Ϊ A0 B

6⣬ʵƽλ¿ʼ˶ʱλΪ A

Ц? B C - D ? 6227һʵԭOΪƽλг,ΪA t0.1sʱxA t0.6sʱ x-AΪ A0.5s B1s C11s(n?0,1,2,......) D s(n?0,1,2,......) 1?2n2?2n8һʵгͼʾʵ˶Ϊ

5?3t??)cm 245?3(B) x?4cos(t??)cm

24?3(C) x?4cos(t??)cm

24?3(D) x?4cos(t??)cm

24(A) x?4cos(

6

9ȵIJԴֱA BC˥ĴΪˣAC=

5,BC=10,C㴦һ 2A ǿ B CΪ0 D޷ȷ 10һʵͬг񶯣񶯷Ϊ X?52cos(4?t??/2)cmһ񶯷Ϊ

X1?5cos(4?t?3?/4)cmһ񶯷Ϊ

A X2?5cos(4?t??/4)cm BX2?5cos(4?t??/4)cm CX2?5cos(4?t?3?/4)cm DX2?5cos(4?t?3?/4)cm 11ijʵx1?10cos(t-Ц)cmx2?20cos(t-)cmͬͬƵʵļ23г񶯣񶯵Ϊ

A30cm B10cm C29.1cm D20cm 12к񶯵ijΪ

A 0.5 B0.05 C13ijʵx1? D 0.388 4Ц?10cos(t-)cmx2?20cos(t?)cm ͬͬƵ

22ʵļг񶯣񶯵Ϊ

A2cm B8cm C10cm D30cm

T14֪y?0.005sin(10t-?x)cmʱ䵥λΪ룬t=Դ

4vӦΪ

Av=0.5 Bv=-0.5 Cv=0.5cos10t Dv=0 15֪y?Acos(Bt?kx?M)ʽABkMΪֵΪ A

2BB B2BK CBK D 2?KK2?K? B C D 2?K?K16У򲨳Ϊ A

17ʵyг񶯣Ϊ12cmƵΪ0.5Hzt0ʱλΪ-6cmyḺ˶ôԭг񶯷Ϊ

2?2?)cm By?12cos(t??)cm 32322Cy?12cos(?t??)cm Dy?12cos(?t??)cm

33Ay?12cos(t?7

?218УɴԭĺᲨx򴫲䲨Ϊ4m/s򲨶Ϊ

x2x2)???cm By?12cos??(t?)???cm 4343x2x2Cy?12cos??(t?)???cm Dy?12cos??(t?)???cm

40034003x19ijвIJΪy?10cos(10?t-)cmڲϣΪ

100Ay?12cos??(t?A100cm/s B1000cm/s C100cm/s D1000cm/s 20ȷIJ̷ֱΪ

x1?6cos2?(5t-0.1x)cmx2?6cos2?(5t-0.01x)cm

IJ1ͦ2ӦΪ

A1=10cm , 2=20cm B1=2cm , 2=8cm C1=10cm , 2=10cm D1=10cm , 2=100cm

21һƽгIJΪy=Acos2(Bx-Ct+D)ʽABCDΪֵò١Դ񶯳λֱΪ

B12D B CBB1C 2D D

CBA

C12D BBC12D BBx22ijвIJΪy?10sin(10?t-)cmڲϣxһλ100ƷΪ

Ay?10sin(10?t-2?) cm By?10sin10t cm Cy?20sin5?t cm D

y?10cos(10?t-2?)cm

23Ϊ˲ⶨijCƵʣѡȡƵ֪ƵʽӽABAƵ800 HzBƵ797 Hzе飺һʹACͬʱ񶯣ÿǿΣڶʹBCͬʱ񶯣ÿǿһΡĽͿȷCƵ

A3 Hz B 1 Hz C802 Hz D 798 Hz E796 Hz

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