Two thin lenses (focal lengths f1and f2) are separated by distanced. by starting from the thin lens equation, calculate the back and front focal lengths of the system.

Which of the following is the phase that results when the moon is on the opposite side of the earth from the sun? a. quarter moon b. crescent moon c. new moon d. full moon

What is the power rating of the lightbulb if 3.0 a flow through it when connected to a 15 v battery

An object with initial temperature 130 ∘ f is submerged in large tank of water whose temperature is 50 ∘ f . find a formula for f ( t ) , the temperature of the object after t minutes, if the cooling constant is k = − 0.2 . remember newton's law of cooling (the rate of change of temperature with respect to time is equal to k times the difference between the temperature of the object and the surrounding temperature) ! : )