1 A stopwatch is used to time a runner in a race. The diagrams show the stopwatch at the start and
at the end of a lap of the race.
0:50:10
V
1:40:10
start of lap
end of lap
How long did the runner take to finish the lap of the raco?
A 50.00 seconds
B 50.10 seconds
C90.00 seconds
D
100.10 seconds

Ajet plane has a sound level of 120 db at a distance of 60 m. what is the q23. sound level at a distance of 6.0 km? (60)2 (6000)? om solution 80db db, hint: 16x assume ultrasound waves travel through the body of an animal at 1540 q24. m/s. if a 30,000 hz signal were reflected off a portion of a heart which was moving toward the source at 3 m/s, what frequency signal would return to the stationary source? solution 30.117hz

Inside of a windmill or a dam is a that is used to transform one type of energy into electrical energy. a. motor b. generator c. transformer d. power pack

Two balls, each with a mass of 0.5 kg, collide on a pool table. is the law of conservation of momentum satisfied in the collision? explain why or why not