Exercício de Ajuda na resolução de questões sobre Velocidade
Exercício:
1- (UERJ) A velocidade normal com que uma fita de vídeo passa pela cabeça de um gravador é de aproximadamente 33mm/s.Assim,o comprimento de uma fita de 120 min de duração correspondente a cerca de:
a) 40 m b)80 m c)120 m d) 240 m
2- (UFES) Uma pessoa caminha 1,5 passos/segundos com passos que medem 70 cm cada um.Ela deseja atravessar uma avenida com 20 m de largura.O tempo minimo que o sinal de transito de pedestres deve ficar averto para que a pessoa atravesse a avenida com segurança é:
A) 10s B)14s C)20s D)32s E)45s
3- (Unimep-SP)Uma pessoa,preocupada em manter-se em forma,pratica caminhada diariamente,percorrendo em media 6 km por dia.Sabendo-se que a pessoa executa uma marcha uniforme de 140 passos/min e que cada “passada” corresponde a cerca de 70 cm,respectivamente,a velocidade media desenvolvida pela pessoa e o tempo gasto em cada caminhada serão aproximadamente:
A)5,9 km/h 61 min B) 7,1 km/h e 51 min C) 5,9km/h e 44 min D) 3,5 km/h e 103 min
e) 3,5 km/h e 66 min
Gostaria que me ajudassem na resolução,por favor.
3- (Unimep-SP)Uma pessoa,preocupada em manter-se em forma,pratica caminhada diariamente,percorrendo em media 6 km por dia.Sabendo-se que a pessoa executa uma marcha uniforme de 140 passos/min e que cada “passada” corresponde a cerca de 70 cm,respectivamente,a velocidade media desenvolvida pela pessoa e o tempo gasto em cada caminhada serão aproximadamente:
A)5,9 km/h 61 min B) 7,1 km/h e 51 min C) 5,9km/h e 44 min D) 3,5 km/h e 103 min e) 3,5 km/h e 66 min
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