A plane travels 200 meters in 20 seconds. What is its velocity?

Jackson is designing a new heater, and he wants to experiment with different thermally conductive materials. which of these materials would be useful in conducting heat?

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

The focal length of a lens is determined by the curve of the lens and the material that the lens is made from. (5 points) is this true or false? ?