A bird flies straight down from its perch on the branch of a tree to the ground, a distance of 10.0m. the bird then returns straight up to the perch. the total of flight is 4.0s. what is the bird’s a) distance travelled?
b) displacement?
c) average speed?
d) average velocity?

The graph below represents the work done by a student while running up flights of stairs. determine the student's power output after 10 seconds: 1600 j/s 8000 j/s 160 j/s 800 j/s

The current in a hair dryer measures 11 amps. the resistance of the hair dryer is 12 ohms. what is the voltage?unit:

**urgent** roberto plans to use two transformers to reduce a voltage of 120 v to 4 v. he uses a transformer that has 300 coils in the primary winding and 50 coils in the secondary winding. he has four other transformers, as listed in the table. which transformer should roberto use to have an ending voltage of 4 v? a- w b-xc- yd- z