Astudent measures the speed of a rolling ball three times. she adds the measurements and divides by 3.what quantity did the student calculate? average speed varying speed constant speed instantaneous speed

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?

An electromagnet is a device in which moving electric chargers in a coil of wire create a magnet.whats one advantage of using electromagnetic in devices

Which of the following describes how a microwave heats food