George and Frank are moving their piano for the big concert. George is pushing the piano with 25 N of force. Frank is pulling the piano with 20 N of force. What is the combined force on the piano? A. 45 N to the right
B. 5 N to the left
C. 5 N to the right
D. 45 N to the left

The slope of a good speed time indicates ? a. velocity b. acceleration c. direction d. speed

What is the relationship between the wavelength of a wave and it's energy?

In a simplified model of the human eye, the aqueous and vitreous humors and the lens all have a refractive index of 1.40, and all the refraction occurs at the cornea, whose vertex is 2.60 cm from the retina. what should be the radius of curvature of the cornea such that the image of an object 40.0 cm from the cornea’s vertex is focused on the retina?