Question 7 of 10 Which observation is evidence of refraction in this photo?
A. The top of the man's head appears disconnected from the rest of
his head.
B. The man's arm is clearly seen under the water.
C. The snorkel in the man's mouth appears yellow.
a
D. The water in which the man is swimming is transparent.

The position of a dragonfly that is flying parallel to the ground is given as a function of time by r⃗ =[2.90m+(0.0900m/s2)t2]i^− (0.0150m/s3)t3j^. a: at what value of t does the velocity vector of the insect make an angle of 34.0 degree clockwise from the x-axis? b: at the time calculated in part (a), what is the magnitude of the acceleration vector of the insect? c : at the time calculated in part (a), what is the direction of the acceleration vector of the insect?

Which car has the most kinetic energy? a. a car of mass 1000 kg with a speed of 3 m/s b. a car of mass 2000 kg with speed 7 m/s c. a car of mass 1000 kg with speed 7 m/s d. a car of mass 2000 kg with speed 3 m/s

Suppose a comet has an orbital period of 309.1 years around the sun. what is it’s average distance from the sun?