atps fisica I

1. F=kx Kx=F K=400.10 K=4000n/m

a)

10=80J

b)Ep=4000.
Ep=
Ep=2.10³.25.
Ep=50.
Ep=5,0 J

2. M.g.h= 15 cm=15.m 1,2. 9,8. h= 11,76h=900.225. 11,76h=202500.0,0001 11,76h=20,25 H= H=1,72 m

3. a) = 2.=400. 2=400.0,0484 2=19,36 = V=3,1 m/s b) m.g.h= 9,8.h= 9,8.h=4,805 H=0,5 m
4. a) + m.g.h = + 2.10.4 = + 80 = 200
=200-80
=120 b)= =120 = =1,2 X=1,09m 5. a) =m.g.h =10 h =20h 20h=225 H=11,25 m

b)v= v= v=15 m/s

6. a) =m.g.h =5.10.h H=3,6 m

=m.g.h =5.10.h

7. + m.g.h = + 0,15.10.1,2 = 0,075. + 1,8 =950.5625. = 534,375.fat = = =3562,5 8.

F=5 N

9. =m.g.h +Me.P + m.g cós a)=510.3+0,5.5.10+5.10 cos53,10 =150 + 10 + 50. 0,6 =160 + 30 = =0,32 X= 0,56 m

b)h=5.10.0,3 h= 15m

10. = +m.g. Mc +m.g. cos = + 1,5.10.0,5 + 5.10. cos30° Eel=77,25 J
11. a) 5.( V= 0,25m/s b)mgh= 0,2.10.0,05= = V=1 m/s

c)
12. a) 40.( V= 5,36m/s b) mgh= 0,5.10.h= 5h=20.0,36 h= h=1,44 m
13.

36=16+5a a= a=4

14. b) T=F.d T=100.4 T=400J

c)T=F.d T=100.12 T=1200J

d)T=100.8 T=800J

F=m.a F=10.10 F=100N

15. T=F.d 2,7=2,4.d