Indica si las siguientes afirmaciones son verdaderas. En caso de que sean falsas, explica por qué:

A. La leva y la excéntrica son mecanismos de transformación reversibles.

B. Todos los trinquetes permiten el giro en un sentido y lo impiden en el sentido contrario.

C. El freno de cinta consta de un fleje que presiona un tambor acoplado al eje que se desea frenar.

D. Las juntas Cardan transmiten el movimiento entre árboles que forman un determinado ángulo.

E. Los amortiguadores y las ballestas son mecanismos que frenan el movimiento.

Which best describes the role or restriction enzymes in the analysis of edna a. to break dna into fragments that vary in size so they can be sorted and analyzed b. to amplify small amounts of dna and generate large amounts of dna for analysis c. to purify samples of dna obtained from the environment so they can be analyzed d. to sort different sizes of dna fragments into a banding pattern that can be analyzed

5.a fishing rod is formed from a composite material of 0.5 kg of glass fibers embedded in a matrix of 0.5 kg of epoxy resin. the glass fibers are assumed to be long, continuous and unidirectional. to achieve a greater stiffness it is proposed to use a different composite that is comprised of long continuous carbon fibers that will be embedded in a matrix of 0.5 kg of epoxy resin. if the modulus of elasticity of the carbon fiber composite is 10% greater than the elastic modulus of the glass fiber composite, estimate the mass of carbon fibers that will be used to make the carbon fiber composite. assume the applied tensile stress is parallel to the direction of the long axis of the fibers. the epoxy resin, glass fiber, and carbon fiber have an elastic modulus of 5, 86, and 350 gpa respectively and a density of 1100, 2500, and 1800 respectively.

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