An illuminated object is 20 cm from the center of a convex lens. A focused image is formed on a screen 100 cm from the lens. What is the focal length of the lens?

Abaseball picther can throw a ball at about 90 miles per hour, v = 40 m/s, on solid rock ground. we now put him into space. when he throws the ball, which weighs mb = 0.15 kg moves away from himat the same speed. how long does it take the ball thrown in space to travel the 30 meters to the batter? he weighs mp = 100kg

Explain earth's motion, using the terms "precession" and "rotation" in your answer.

Write a full page that sumerizes thermodynamics it’s from the website visionlearnig