A positive lens has a focal length of 6cm. An object is located 24cm from the lens. a. How far from the lens us the image?
b. is the image real or virtual, erect or inverted?

Suppose that two tanks, 1 and 2, each with a large opening at the top, contain different liquids. a small hole is made in the side of each tank at the same depth 1.57 m below the liquid surface, but the hole in tank 2 has 2.49 times the cross-sectional area of the hole in tank 1. (a) what is the ratio ρ1/ρ2 of the densities of the liquids if the mass flow rate is the same for the two holes? (b) what is the ratio rv1/rv2 of the volume flow rates from the two tanks? (c) at one instant, the liquid in tank 1 is 14.9 cm above the hole. if the tanks are to have equal volume flow rates, what height above the hole must the liquid in tank 2 be just then?

Your town is considering building a biodiesel power plant describe at least two advantages and two disadvantages

What is the measurement of how fast an object moves relative to a reference point?