A converging lens forms an image at 40 cm. A 9 cm tall object is placed in front of the lens at a distance of 78 cm. Determine the focal length of the lens.

If an object with an initial temperature of 300 k increases its temperature by 1°c every minute, by how many degrees fahrenheit will its temperature have increased in 10 minutes? (a) 6°f (b) 10°f (c) 18°f (d) 30°f

According to an observer on earth, planet x is stationary. maria and samir depart earth on their spaceships at the same time, each flying at 0.5c. maria flies toward planet x and samir flies in the opposite direction. according to maria, her voyage to planet x takes 9 years. how many years does maria's voyage take according to samir?

Which of the following is an example of a compound machine. a. a bicycle chain. b. a coffee mug. c. a paper cutter