The refractive index of medium a is 1.54 and that of medium b is 2.12. which statement is correct about this information?

a. a ray of light passing from medium a to b can undergo total internal reflection.

b. a ray of light passing from medium a to b will bend away from the normal.

c. a ray of light passing from medium a to b will bend toward the normal.

d. a ray of light passing from medium a to b can make a critical angel.

Out of the choices given, the statement that is correct about this information is a ray of light passing from medium A to B will bend toward the normal. The correct answer is C. 

Answertraveling around a circular trackexplanation"traveling around a circular track" is the best answer as you could be traveling around a circular track at a constant speed. your velocity would therefore have the same magnitude but will always be constantly direction. since acceleration is the rate of change of velocity, the rate of change will only involve the direction of velocity and not the magnitude.wrong choices: "an object at rest" does not accelerate at all"increasing speed while traveling around a curve" means that the acceleration will not be constant due to only change in direction; it will be constant due to both magnitude and direction"an object in free fall" does not necessarily change direction 

W= fd
where f is an applied force and d is the distance over which it is applied. when a parachuting skydiver is at constant velocity, he is experiencing "terminal velocity", the point at which his acceleration down is canceled out by air resistance. that means that the resisting force of the air is equal to his weight, but in the opposite direction. with this, we can solve for the work done by the force.
w = fd
w = (92.0)(9.81 m/s^2) (325)
w= 2.93 x 10^5 j
the value for work in this case is positive because it is pushing up on the skydiver, who has a downward force of gravity.
therefore the answer is 2.93 x 10^5 j