bài giải chi tiết đề thi thử thpt quốc gia 215 chuyên quốc học huế lần 2

V1 V2

- (songtd1@gmail.com) Câu 1:

u = 120 2cos100πt(V) 1 1 AB

A 2/2 B 3/2 C.1 D.1/2

v1O â φ=-π 4 φ= 2/2 Câu 2: O â

A 3/4 B.1/2 C.4/3 D.1/4

2 d 2 max W v 1 W v 4 Câu 3: â â

u =150cos100πt(V)

cô

A C = 1, 06μF B C = 0,16μF C C = 10, 6μF D C = 106μF

R, UL Z L 2Z C Ta

2 2 2 R r L r 2 2 2 L 5 d r L L L C R r U (U U ) U U U U U U U Z 2Z C 1,06.10 F I I P (U U )I                        Câu 4: = = â â

g = 10m/s2

A Fkvmax = 0,4 N; F = 0,5N B Fkvmax = 2 N; F = 5N C Fkvmax = 2 N; F = 3 N D Fkvmax = 1 N; F = 3N

dh max k max F k( l A ) mg kA F kA       Câu 5: = â

0

Q0 3Q /2 1 0 0 2Q /2 2 2-t1=100 -6

2 10  

A 0,676H B 0,756H C.0,576H D.0,567H

2 1

T T

Câu 6: 4 â

â

g = 10m/s2

A 2,0N B 4,8 N C 3,2 N D 2,8 N

mg k l  

=-2cm   đh F k  l x =3,2N Câu 7: =

4

â = 2

A 1cm/s B 0,9 cm/s C 1,2 cm/s D 0,8cm/s

2 2 C 1 c 1 1 2 2 C 1 2 c 1 2 1 2 C C 1 1 2 1 3 6 c max C 2 2 1 2 c 1 2 2F 1 1 kA kA F ( A A ) A A ( 1 ) 2 2 k 2F 1 1 kA kA F ( A A ) A A ( 2 ) 2 2 k 8F F S A A A A 4 A 0,005 A 0,105m k k F 1 v ( A ) k 10 N / m F 5.10 N k 10 1 1 kA mv F A v 0,0099874m / s 1cm / s 2 2                                        Câu 8: â

Câu 9:

Câu 10:

4

4 4

' 2 0 0 0 0 t T 0 1 H 12,5%H 12,5%( 2H ) H 2 H 4 H 2 H t 2T          Câu 11: g 1 1 π x = A cos ωt - (cm) 6       x = A cos ωt -2 2  (cm) x = 3 3cos ωt + (cm) 2 1

A 9 3 cm B.15 3 cm C.18 3 cm D.9cm

1 2

sin 6

A.sin 3

sin 6





Câu 12: = 4 = 4

= 2 â

A x = 10cos 10t +2 (cm) 3        B x = 10sin 10t + 3 (cm)        C 2 x = 10cos 10t - (cm) 3        D x = 10cos 10t + 3 (cm)       

mg A l 0,1m 10cm k      L =   l x 5cm  x 5cm

suy nhanh φ=-2π/3 Câu 13: = 0 π

0

A 1 400 2

400s B 1 300 2

300s. C 1 600 5

600s D 1 500 3

500s

O

π/6 π/6

V

1 1 1 0 0 2 2 1 t 3 300 i 0,5I i 0,5I 2 2 t 3 300                              Câu 14: â

= = = 1

L=L2=L1 L1

A -4 1 1 3.10 L = H; C = F 4π 2π B -4 1 4 3.10 L = H; C = F π 2π C -4 1 4 10 L = H; C = F π 3π D -4 1 2 10 L = H; C = F π 3π

L1 L2 C L1 Z Z 3 Z Z 2 4    2 L1 C L2 C L1 1 2 2 L1 C Z Z Z Z Z tan tan 1 1 1 Z 4R 400 ; Z 300 R R 16 R                    Câu 15: -â

1, S2 O â

â O

A 0,2mm B 0,6mm C 0,8mm D 0,4mm

y x 0,5i 0,5 0,5 d 0,5.0,6.0,8 y 0,4mm d D D a a 0,6           Câu 16: -â

1S2= 1 2 â

4 1S2 â

S1S2

â â â â

1 1 1 D x k a a a 2 a D x 3k a a D x 4 a k 8 D D x k k a 2 a 2a                                  Câu 17: x = 5cost + /3 (cm) 

A.605s 3 B 304 s 3 C 604 s 3 D 708 s 3

S=2015cm=2000cm+15cm=100x20cm+15cm

2 604 604 100.2 2 t s 3 3 3                     Câu 18: 21084Po

= 3

4 D 138

Po He

Câu 19: = â g

riêng D=8,67g/cm3 =

’= 4 ’= ’= ’=

D T ' T D d   Câu 20: N u n n m ch g m cu n c m thu n L m c n i ti p v n tr thu n R = 1 vào hai c c c a ngu n m t chi u có su n tr trong r thì trong m I Dùng ngu n n n cho m t t n dung C = 2.10-6 n tích trên t t giá tr c i, ng t t n kh i ngu n r i n i t n v i cu n c m thu n L thành m t m ch d ng thì trong m n t t do v i chu kì b ng .10-6 s n c i b ng 8I Giá tr c a r b ng A 2  B 1  C 0,5  D 2,5 

0 0 0 0 E I R r Q C.E Q C( R r ) T 2 2 E I 8 I 8I 8 R r                  Câu 21: â

=

4

1 H U ' U 1 H '    Câu 22:

Câu 23: = =

= = -34

J.s, e=1,6.10-19C, c=3.108

A 0,258 A B 0,416 A C 0,125A D.0,179A

bh h.I c H pe  (

Câu 24: β+: â â

â â

â â

â â

Câu 25:

4 â

= â

A.29 B.27 C.25 D.26

 

s

L

2i

vidu 7 ,9 7

 

 



Câu 26: O1O2

O1O2 4

O1O2

A 40 cm/s B 53,4cm/s C.26,7cm/s D.20cm/s

2 1 CDM d d 14 20 K 6 1cm v f              Câu 27:

4

â â â â â

A 83 B 85 C.77 D.81

M 1 2 3 1 2 3 N 1 2 3 1 2 2 1 3 1 3 1 x 15mm 17,85i 13,39i 11,9i N 44; N 33; N 29 x 20mm 26 ,19i 19,64i 17,46i k 4 8 16 20

k 3 6 12 15 k 3 6 9 k 2 4 6 0 12 24 0 9 18 0 12 0 8                                                                    trung 2 trung 3 sang 1 2 3 trung 2 tru 3 2 3 2 ng 3 15 18 21 10 12 14 k

24 N 17; N 4 16 0 9 18 0 8 16 N N N N N 2N 81 k                                                            Câu 28: â 4

â

A f=170Hz B.f=200Hz C.f=85Hz D.f=255Hz

0,85 2 v f     Câu 29: â

â â

ia â

Câu 30:

AB= AM= MB=

A R B L,C C.R,L D.C,R

AM 2 2 2 AB AM MB AM MB MB AM MB MB 0 2 U U U 2U U cos ( 0TM ) 2 2 0 ( TM ) R, L 2                                   Câu 31: â â â 4

â 4

φ= π

A 12 Hz B 12,5 Hz C.8,5Hz D 10Hz

X

2 d f v



Câu 32:

â

Câu 33: â 4

-

A 60 cm/s B 240cm/s C 40cm/s D 120cm/s

tb S A 10 A A S v 240cm / s T t 1 2 2 t t 6 6 N 24               Câu 34: â

â 0

Câu 35:

4 4

L Cb C Cb C W W W 3 2 W ' W W W W W 4 W 2 4              Câu 36: â

1 2

A 2 1 2 2U R + R B 2 1 2 U 2 R R C 2 1 2 1 2 U (R + R ) 4R R D 2 1 2 U R + R

 2 1 2 1 2 L C 2 2 L C 1 2 Max L C 1 2 P P R R Z Z U U R Z Z R R P 2 Z Z 2 R R           

Câu 37: â = â A=

â 0=0,1nW/m2 â

A 0,1nW/m2 B 0,1GW/m2 C 0,1W/m2 D 0,1mW/m2

0 I L 10 log I  Câu 38: â â

â

MB

L

C 1













A UAM B UAM C UAM D UAM

Max L C MB max C Max 2 2 C C AM max L C Z Z U I Z I 4R Z Z U Z Z 2          L AMmax ,không ng ,

Câu 39: â â

4

â

A 2π 7cm/s 3 B 2π 3 cm/s 3 C 2π 5 cm/s 3 D 2π cm/s

0 0 2s  4 s 2cm Khi = =

2 2 2 2 2 0 0 2 v s S v  S s       Câu 40: â

= 0 1 = 0 1

1

A 350 B 300 C.450 D.250

  2 2 2 2 0 a b a b 1 1 2 2 2 2 c d c d 1 1 T T ( 2T ) T 60 0 25 0 T T 1,5T T                    Câu 41:

phatra chieuvao   Câu 42: 15O

3 â

60 t 10 120 12 T V 0V V i i H H 2 1,5.3,7.10 60.2 2,3547 pra / ph H V V 7,5lit H        Câu 43: = â

â â

â

8 m/s

D A 2 .AD f 3 v 8m / s 2 2 v                     

Câu 44: â 1, Re1, Mi1 , Fa1 , Sol1, La1, Si1 â 2

â

- â â â

âm Do2 â â â

n 1 2 n f 1 log f 12   â â â 1

4 4 â = â

D

B

E

6

8

8 0,5 1,0

1,5 2,0

x2

x1 -6

0

x(cm)

t(10-1s)

n 1 2 n f 1 log f 12   Câu 45: π 4

2

2

R cos Z  Câu 46: â

â

A 5 Hz B 12,5Hz C 50Hz D.75Hz

2 2 1 2 1 1 f k 1 f f 12,5Hz f  k  4  4  Câu 47: â

0 â

A 2mg (1 - cosα ) 0 B mg (1 - cosα ) /2 0 C mg (1 - cosα )0 D mg(1 - cosα ) 0 Câu 48:

< 0

0 hc hc eV    Câu 49: 1 2

π π

π 4 π

  1 max 2 2 2 1 2 1 2 T 0,05s 20 2 x 6 cos t cm v A 200 cm / s x 8 cos t cm 2 A A A 2 A A cos 10                                        Câu 50: â 7 â â

â A=6,022.1023 mol-1

A 2263 kg B.2461kg C.2361 kg D 2333kg

tongph ph U 1 ph 1 ph u 1 ph A U U A E Pt N N E H E t.A P m( g ) H E N N A m N             ( )