An object is placed to the left of a convex lens with a 17 cm focal length so that its image is the same size as the object. What are the image and object positions (magnitude only)?

An observer that stands still as the electron moves by him, will observe

Thomas his older brothers, who own a junk yard, on the weekends to earn extra money. he likes to them push broken-down cars to the back of the junk yard because it makes him feel strong. last saturday, they pushed three cars with different weights, and he noticed he used different amounts of force for each one. the cars were the following weights: white car: 2,700 kg red car: 1,500 kg blue car: 2,100 kg think about how much force is needed to move each car. which correctly lists the cars in order from the most to least amount of force needed to move them? a) white, blue, red b) blue, red, white c) red, white, blue d) white, red, blue

Achlorine atom has 17 protons and 18 neutrons. what is its mass number? what is its atomic number?