[ 395 ] Physical Science GED ® TEST SCIENCE FLASH REVIEW • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • How much force (in Newtons) is needed to raise the object in the pulley system 4? Adapted from Wikimedia: “Pulley diagram with 4 pulleys” F z = 100 N F Z = 50 N F Z = 33˜ N F Z = ? ? s = 20 cm s = 10 cm s = 30 cm s = 40 cm F L = 100 N F L = 100 N F L = 100 N F L = 100 N h = 10 cm h = 10 cm h = 10 cm h = 10 cm A. 25 N B. 33 N C. 50 N D. 10 N The equation for photosynthesis is: 6CO 2 + 6H 2 O + Energy → C 6 O 6 + 6O 2 H 12 Which of the following correctly identify(ies) the reactants in the equation? Choose one or more. • glucose • oxygen • carbon dioxide • water