2007.11.07 Технически университет - София ФИЗИКА

Page 1

1

– 2007

11

90 km/h

1. . 50 m 2. ,

.

.

5s ? . 125 m 10 g

, . 100 m

. 75 m 60 cm

.

,

-

. 150 m 600 m/s.

,

-

. . 1 000 N 3. . 0,02 m 4. : . 1,5 m 5. 8 kJ . . 500 J/kg·K 6.

. 1 500 N 3 Hz . 0,03 m

. 2 000 N 0,5 cm. . 0,04 m

. 2 500 N 1s

1 kHz .2m

. 2,5 m 0,2 kg

. 3 000 N

20°

: . 0,05 m 2 km/s.

. 0,06 m

.3m 70° ,

. 3,5 m :

. 750 J/kg·K q(

.

. f E

. 800 J/kg·K

. 900 J/kg·K

. 1000 J/kg·K

.

f . E =0

). C?

.

.

1

7.

, -

, . ,

-

? .1 8.

.2

.3

.4 Oxy,

.5 O.

, ,

Oz.

: Ox;

. . 9.

.

Oy;

n > 1. .

-

.

30° ; .

30°; .

-

. 30°; .

-

, 10. . 30, 26, 0

Oz;

; . 30° :

56 26 Fe

. 30, 26, 30

, . 26, 30, 0

. 26, 30, 26

30°; . . : . 56, 26, 0

1


1

-

11-16

, h = 78 cm .

B B

A

B

-

. v1 = 3 m/s

t = 0,5 s

v2 = 1 m/s.

, P.

g = 9,8 m/s2.

.

A

11. 12. 13. 14.

. , m = 100 g,

? B

? B

? -

? B

15. 16.

? P?

17-20

,

-

= 15 V. C = 5 F.

17. 18. 19. 20.

R=3

.

.

.

C? R1? R5? ,

?

2


!"-#$%&'

!()* +,*(-,*&., & %&/&.,,

()*%+%$,

!"#$%&' 1 2 3 4 5 6 7 8 9 10

-

. . . . . . . . . .

! ! ! ! ! ! ! ! ! !

a=

12

14

/ / / / / / / / / /

vA = v1 = 3 m/s

11

13

"=

v 2 ! v1 = !4 m/s2 t

!a !(v 2 ! v1 ) = = 0, 41 g gt

#E =|

m (v12 ! v 22 ) 2

|= 0, 4 J

15

t! =

2h = 0, 40 s g

16

l = v2

2h = 0, 40 m g

17

Q = C ! = 75.10!6 C

I1 =

18

19

20

1,2&,3* 1

11-07-20070.

I5 =

! =5A R

! 3! 3(15 V) = = =3A 5R 5(3 $) R2345

W =

8! 2 = 120 W 5R

0 0 0 0 0 0 0 0 0 0


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