Afar sighted person can not see clearly objects that are closer to his eyes than 60.0 cm. which one of the following combinations represents the correct focal length and the refractive power of the contact lenses that will enable him to see the objects at a distance of 25.0 cm from his eyes?
a) -42.9 cm, +2.33 diopters
b) -42.9 cm, -2.33 diopters
c) +60 cm, +42.9 diopters
d) +42.9 cm, +2.33 diopters
e) +42.9 cm, -2.33 diopters

Which of the following would not be taken into consideration when describing the quality of a sound

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 790 n/m. it is initially at rest on an inclined plane that is at an angle of 28 degrees with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is k = 0.14. in the initial position, where the spring is compressed by a distance of a = 0.18 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. b) if the spring pushes the block up the incline, what distance, l, in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.

The graph describes the motion of an object. the object moves with from a to b. it from b to c. it moves with from c to d.