An object is placed 100cm in front of a lens of focal length 20cm. A second lens is placed 35 cm beyond thte first, this second lens having a focal length of 8.0cm. If the height of the object is 6.0cm, what is the heiht of the final image

Amodel rocket with a mass of 0.212 kg is launched into the air with an initial speed of 84 m/s. how much kinetic energy will the rocket have at a height of 214 m? assume there is no wind resistance. 634 j 303 j

Awind turbine is rotating counterclockwise at 0.5 rev/s and slows to a stop in 10 s. its blades are 20 m in length. (a) what is the angular acceleration of the turbine? (b) what is the centripetal acceleration of the tip of the blades at t=0s? (c) what is the magnitude and direction of the total linear acceleration of the tip of the blades at t=0s?

What was the first instrument to ever record an earthquake?