11. The eyepiece of a refracting telescope has a focal length of 90 cm. The distance between objective and eyepiece is 1.8 m and the final image is at
infinity. What is the angular magnification of the telescope?
Give solution​

To protect all four receptacles on a branch circuit that surrounds a swimming pool, you would install which of the following configurations? a. gfci feed-through receptacle at the end of the load's circuit b. gfci-terminated receptacle at the beginning of the load's circuit c. gfci feed-through receptacle at the beginning of the load's circuit and the other receptacles connected to the load side of that receptacle d. gfci-terminated receptacle at each end of the load's circuit

In addition to gravity, what is the other predominant force that affects the motion of a pendulum?

What is the difference between mass density and weight density?