Answer questions 3 through 12
3. [-/2 Points] DETAILS OBINPHYS8 7.P.006. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER current of 0.9 A goes through an electric motor for 8 min. How many coulombs of charge flow through it during that time? C Need Help? Read It Submit Answer 4. [-/2 Points] DETAILS OBINPHYS8 7.P.010. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER The resistance of each brake lightbulb on an automobile is 4.8 0. Use the fact that cars have 12-V electrical systems to compute the current that flows in each bulb if they are connected in series. (For simplicity, assume that the circuit is only composed of one brake lightbulb and the car battery.) A Need Help? Read It Submit Answer 5. [-/2 Points] DETAILS OBINPHYS8 7.P.017. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER All of the electrical outlets in a room are c nnected in a single parallel circuit. The circuit is equipped with a 20-A fuse, and the voltage is V = 120 V. Wall outlets 20-A fuse (a) What is the maximum total power that can be supplied by the outlets without blowing the fuse? b) How many 1,400-W appliances can be plugged into the sockets without blowing the fuse? appliance(s) Need Help? Read It Submit Answer 6. [2/2 Points] DETAILS PREVIOUS ANSWERS OBINPHYS8 7.Q.015. MY NOTES ASK YOUR TEACHER A solid metal cylinder has a certain resistance. It is then heated and carefully stretched to form a longer, thinner cylinder. After it cools, will its resistance be the same as, greater than, or less than what it was before? Explain your choice. The resistance will be the same since the resistance is independent of the length and cross-sectional area. Increasing the length and shrinking the radiu e resistance. The resistance will be greater since the resistance is proportional to length and inversely proportional to cross-sectional area. Increasing the length and shrinking the radius both act to increase the resistance. The resistance will be less than before since the resistance is inversely proportional to length and proportional to cross- sectional area. Increasing the length and shrinking the radius both act to decrease the resistance Need Help? Read It Submit Answer 7. [-/2 Points] DETAILS OBINPHYS8 7.P.004. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER During 22 seconds of use, 280 C of charge flow through a microwave oven. Compute the size of the electric current. Need Help? Read It Submit Answer 8. [-/2 Points] DETAILS OBINPHYS8 7.P.005. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER lightning stroke lasts 0.08 s and involves a flow of 207 C. What is the current? Need Help? Read It Submit Answer . [-/2 Points] DETAILS OBINPHYS8 7.P.008. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A current of 17.7 A flows through an electric heater operating on 220 V. What is the heater's resistance? Need Help? Read it Submit Answer 10. [-/2 Points] DETAILS OBINPHYS8 7.P.015. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER An electric eel can generate a 308-V, 0.7-A shock for stunning its prey. What is the eel's power output? W Need Help? Read It Submit Answer 11. [-/2 Points] DETAILS OBINPHYS8 7.P.016. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER An electric train operates on 720 V. What is its power consumption when the current flowing through the train's motor is 2,130 A? W Need Help? Read It Submit Answer 12. [-/2 Points] DETAILS OBINPHYS8 7.P.021. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER An electric clothes dryer is rated at 5,400 W. How much energy does it use in 30 min
