What is the average speed of a helicopter that flies 50 km in 20 minutes and then 30 km in 10 minutes? Answer the question for speed in Km/hr. 2.7 km/ min
2.7 km/ min

160 m/ s
160 m/ s

160 km/ hr

If the radius of curvature of the cornea is 0.75 cm when the eye is focusing on an object 36.0 cm from the cornea vertex and the indexes of refraction are as described before, what is the distance from the cornea vertex to the retina? express your answer to two significant

Directions: count the number of atoms. ar co2 na3po4 so3 nac2h3o2

Thermal radiation gets its name because