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13/12/2009
Física
PADRÃO DE RESPOSTAS
(VALOR DE CADA QUESTÃO = 2 PONTOS)
Questão Resposta
A B B B B Ao o o o o o75 3 75 5cm e 15 cm× = → × = → = =
A B A B A B15 (1 ) 5 (1 ) 15 (1 300 ) 5 (1 300 )α θ α θ α α= → × + Δ = × + Δ → × + = × +
B
A B B15 4500 5 1500 15 4500 5 1500
9
α
α α α+ = + → + = +
1
1
2 o
B B10 1000 1 10 Cα α
−
−
= → = ×
=PV nRT
2,46 15 1,5 0,082 300 K× = × × → =T T
Δ 900 300 600= − =θ
2
Δ 3 2,42 600 4356 calθ= → = × × =Q mc Q
Δ = ΔQ mc t
o
cal
12 kcal 500g 1 ( 0)
g C
= × × −maxT
Neste caso, o
0 24 C.− =maxT
Para a quantidade de calor ser maior que 12 kcal, Tmax > 24 o
C.
3
Portanto, são 5 as capitais nas quais é necessário fornecer mais de 12 kcal para aquecer
500 g de água.
19 19
= = 1 10 1,6 10 = 1,6 C−
→ × × ×q Ne q
1,6
= = = 0,8A
2
→
q
i i
t
= ×P U i
4
= 12×0,8 = 9,6 WP
=pE mgh
1 2= 5000 m e = 500 mh h
5
1 1
2 2
5000
= = = 10
500
E h
E h
360
= 1
α
−n
360
= 1
4
−n
n
2
= 0+ − 90n n
6
o
1 2= e = 9 = 9 4 = 36α−10 → ×n n
13/12/2009
Física
1 1
2 2
x 1 x
x 2 x
= sen30 = 0,4 10 0,5 = 2,0 N
= sen = 0,6 10 sen = 6,0 sen N
× × × ×
× × × × ×
P m g P
P m g β P β β
1 2x x=P P
2,0 1
2,0 = 6,0 sen sen =
6,0 3
=× →β β
7
1
= arc sen
3
β
Hg Liq E=+V V V
E Hg Liq E E Hg Hg Liq Liq= =μ μ μ+ +→E E E V g V g V g
Hg Hg9 256 = 13,6 4 (256 )× × + × −V V
8
3
Hg = 133,3 cmV
N
Δ=A v
1 2 3Δ = Δ Δ Δ+ +v v v v
1 2 3Δ = 6 4 = 24 cm/s Δ = 4 ( 3) = 12 cm/s Δ = 6 4 = 24 cm/s
Δ = 24 ( 12) 24 = 36 cm/s
× × − − ×
+ − +
v v v
v
9
0Δ = 36 = 2 = 38 cm/s− → − →v v v v v
2
C
1
=
2
E mv
21 18
9 = 3 = = 2 kg
2 9
× × →m m
=Q mv
10
= 2 5 = 10 kg.m/s×Q

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2010 gabarito fisica

  • 1. 13/12/2009 Física PADRÃO DE RESPOSTAS (VALOR DE CADA QUESTÃO = 2 PONTOS) Questão Resposta A B B B B Ao o o o o o75 3 75 5cm e 15 cm× = → × = → = = A B A B A B15 (1 ) 5 (1 ) 15 (1 300 ) 5 (1 300 )α θ α θ α α= → × + Δ = × + Δ → × + = × + B A B B15 4500 5 1500 15 4500 5 1500 9 α α α α+ = + → + = + 1 1 2 o B B10 1000 1 10 Cα α − − = → = × =PV nRT 2,46 15 1,5 0,082 300 K× = × × → =T T Δ 900 300 600= − =θ 2 Δ 3 2,42 600 4356 calθ= → = × × =Q mc Q Δ = ΔQ mc t o cal 12 kcal 500g 1 ( 0) g C = × × −maxT Neste caso, o 0 24 C.− =maxT Para a quantidade de calor ser maior que 12 kcal, Tmax > 24 o C. 3 Portanto, são 5 as capitais nas quais é necessário fornecer mais de 12 kcal para aquecer 500 g de água. 19 19 = = 1 10 1,6 10 = 1,6 C− → × × ×q Ne q 1,6 = = = 0,8A 2 → q i i t = ×P U i 4 = 12×0,8 = 9,6 WP =pE mgh 1 2= 5000 m e = 500 mh h 5 1 1 2 2 5000 = = = 10 500 E h E h 360 = 1 α −n 360 = 1 4 −n n 2 = 0+ − 90n n 6 o 1 2= e = 9 = 9 4 = 36α−10 → ×n n
  • 2. 13/12/2009 Física 1 1 2 2 x 1 x x 2 x = sen30 = 0,4 10 0,5 = 2,0 N = sen = 0,6 10 sen = 6,0 sen N × × × × × × × × × P m g P P m g β P β β 1 2x x=P P 2,0 1 2,0 = 6,0 sen sen = 6,0 3 =× →β β 7 1 = arc sen 3 β Hg Liq E=+V V V E Hg Liq E E Hg Hg Liq Liq= =μ μ μ+ +→E E E V g V g V g Hg Hg9 256 = 13,6 4 (256 )× × + × −V V 8 3 Hg = 133,3 cmV N Δ=A v 1 2 3Δ = Δ Δ Δ+ +v v v v 1 2 3Δ = 6 4 = 24 cm/s Δ = 4 ( 3) = 12 cm/s Δ = 6 4 = 24 cm/s Δ = 24 ( 12) 24 = 36 cm/s × × − − × + − + v v v v 9 0Δ = 36 = 2 = 38 cm/s− → − →v v v v v 2 C 1 = 2 E mv 21 18 9 = 3 = = 2 kg 2 9 × × →m m =Q mv 10 = 2 5 = 10 kg.m/s×Q