O som mais grave que o ouvido humano é capaz de ouvir possui comprimento de onda igual a 17 m. Sendo assim, determine a minima
frequência capaz de ser percebida pelo ouvido humano.
Dados: Velocidade do som no ar = 340 m/s
a) 10 Hz
b) 15 Hz
c) 17 Hz
d) 20 Hz
e) 34 Hz​

Identify the error in the sentence. my cat was so enormously overweight that the vet suggested, much to my cat's dismay putting him on a diet. a. overweight c. dismay b. suggested, d. diet.

Which explanation describes the forces involved for a person to walk down the sidewalk? a. the person's feet push backward on the sidewalk; the sidewalk pushes backward on the person. b. the person's feet push forward on the sidewalk; the sidewalk does not push on the person. c. the person's feet push backward on the sidewalk; the sidewalk pushes forward on the person. d. the person's feet push forward on the sidewalk; the sidewalk pushes forward on the person.

Imagine that someone pushes one marble toward a motionless marble. would there still be action-reaction forces involved in the collision? how might the marbles’ motions be changed? ?