Considere a questão a seguir.
A
B
C
D
E Você já respondeu e acertou esse exercício. A resposta correta é: E.
0,500
0,123
0,256
0,300
0,368
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A
B
C
D
E Você já respondeu e acertou esse exercício. A resposta correta é: B.
1,28
1,84
2,22
3,13
0,25
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A
B
C
D
E Você já respondeu e acertou esse exercício. A resposta correta é: A.
1,88
2,22
3,15
0,85
0,28
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A
B
C
D
E Você já respondeu e acertou esse exercício. A resposta correta é: D. Considere a questão a seguir.
456
345
234
144
45
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566
C
856
D
1623
E Você já respondeu e acertou esse exercício. A resposta correta é: E. Considere a questão a seguir.
A
B
C
D
E
Você já respondeu e acertou esse exercício. A resposta correta é: D.
25,5%
55,8%
11,3%
18,8%
7,5%
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A
B
C
D
E
100 e 200
400 e 100
200 e 76,6
76,6 e 335,7
76,6 e 100
Você já respondeu e acertou esse exercício. A resposta correta é: D.
A
B
C
D
E Você já respondeu e acertou esse exercício. A resposta correta é: C.
50; 50 e 25
100; 50,8 e 96
50; 25,4 e 47,7
25;12,5 e 50
200; 25 e 80
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A
B
C
D
E
150,3
500
223,2
350,5
75,8
Você já respondeu e acertou esse exercício. A resposta correta é: C.
A
B
C
D
E Você já respondeu e acertou esse exercício.
326,4
500
275,9
100
78,9
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160 N.m
B
6 N.m
C
15 N.m
D
600 N.m
E Você já respondeu e acertou esse exercício. A resposta correta é: E.
A
B
C
D
600 N.m
100 N.m
519,6 N.m
728,45 N.m
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A
B
C
D
E Você já respondeu e acertou esse exercício. A resposta correta é: A.
519,6 N.m
300 N.m
100 N.m
600 N.m
6 N.m
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10 m
B
8m
C
100 m
D
6m
E Você já respondeu e acertou esse exercício. A resposta correta é: C.
A
B
C
D
1000 N
500 N
866 N
250 N
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A
B
C
D
E
500 N e 500 N
Zero e 500 N
250 N e 866 N
866 N e Zero
866 N e 500 N
Você já respondeu e acertou esse exercício. A resposta correta é: D. Um bloco de peso P = 200N está apoiado sobre um plano inclinado que forma um ângulo de 30º com a linha do horizonte. O coeficiente de atrito e Determine qual deve ser o mínimo coeficiente de atrito µ, para que o bloco fique na iminência de descer o plano.
A
B
0,25
0,10
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20,70 e 89,65
A
24,25 e 100
B
20 e 100
C
100 e 25,80
D
19,80 e 21,25
E Você já respondeu e acertou esse exercício. A resposta correta é: A.
Nas empresas engarrafadoras de GLP é comum a utilização de transportadores de corrente, assim como a utilização de ram outro do transporte, apenas utilizando-se do efeito da aceleração da gravidade. Sabendo que a tara (massa da embalagem) ao cliente deve ser de 13 kg, um engenheiro deseja determinar o coeficiente de atrito entre a rampa e o fundo do recipien este recipiente fique na iminência de deslizar (g=10 m/s²).
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F = 50 N
A
F = 133,2 N
B
F = 44,3 N
C
F = 70 N
D
F = 151,80 N
E Você já respondeu e acertou esse exercício. A resposta correta é: E.
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Você já respondeu e acertou esse exercício. A resposta correta é: B. Nos projetos de novas indústrias, há a necessidade de instalação de sistemas de combate a incêndio. Um Engenheiro foi enca Grande São Paulo, para posterior aprovação do bombeiro. O sistema é composto de uma bomba movida por um motor diesel, pequeno porte para pressurização da linha e um reservatório de água (Fig. 1). Visando o projeto do pavimento que sust empresa terceira, que com os dados de sondagem do terreno e peso que será aplicado em cima desta área elaborará o projeto que será armazenado, quais seriam os dados de peso (em N e kgf) que deverão ser encaminhados para a empresa responsável
A
B
C
5.070.000 N e 517.347 Kgf
6000.000 N e 580.347 Kgf
6.500.000 N e 600.000 Kgf
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parede que não ficou exatamente na horizontal, mas formando um ângulo de 3 graus com a horizontal. Mesmo notando o erro, a pe ssoa manteve a prateleira desta man Determine o coeficiente de atrito entre o vaso e a prateleira, sabendo que a força de atrito é o produto deste coeficiente de atrito pela reação da prateleira no vaso. A ma
0,10
A
0,33
B
0,07
C
0,052
D
0,021
E Você já respondeu e acertou esse exercício. A resposta correta é: D.
A lei das cordas de Pitágoras (séc. VI a.C.) estabelece que a frequência de vibração de uma corda é inversamente proporcional ao seu comprimento. Ao vibrarmos a cor Hz. Ao vibrarmos apenas 2/3 da corda, obtemos uma diferença de 5 tons, ou seja, obtemos a nota mi. Usando a lei das cordas de Pitágoras, determine a frequência de vi
A
B
C
D
1000 Hz
438 Hz
660 Hz
1720 Hz
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Os satélites Iridium são um conjunto de satélites de órbita próxima da Terra, usados em telecomunicações (celular). O satélite Iridium 49 possui órbita 480 km acima d quadrado do período orbital com o semi eixo maior da órbita pela constante 4π 2/[G(M+m)], determine o seu período orbital. Despreze a massa do satélite frente à mass R T=6,37.106 m. A constante gravitacional é G=6,67.10-11 m3.kg-1.s-2.
A
B
C
D
E
2,5 h
6,2 h
1,7 h
0,8 h
3,9 h
Você já respondeu e acertou esse exercício. A resposta correta é: C. Um rapaz deseja mover um objeto de massa m = 500 kg. Ele possui uma barra de 3 m de comprimento, apoiada conforme a figura a seguir. S aproximadamente que ele terá que fazer para movimentar esse objeto? Despreze a altura do apoio.
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C
D
E
16 unidades;
64 unidades;
128 unidades.
Você já respondeu e acertou esse exercício. A resposta correta é: A. Considere dois planetas hipotéticos cujas órbitas circulares têm raio r e 16r, em torno de um mesmo "Sol". Sendo T a duração do ano do planeta mais interno, podemos afirmar corretamente que o ano do mais externo vale:
A
B
C
12T
16T
8T
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50,2 dias.
E Você já respondeu e acertou esse exercício. A resposta correta é: E.
Um satélite artificial de 80 kg de massa está em órbita circular acima da superfície da Terra. Se o satélite tivesse o triplo da sua massa, o seu período
o triplo do valor atual;
A
1/3 do valor atual;
B
9 vezes o valor atual;
C
1/9 do valor atual;
D
o mesmo valor atual.
E Você já respondeu e acertou esse exercício. A resposta correta é: E.