Two dc motors, three Led lights, 3 resistors, potentiometer, slide switch, Figure out how much power is needed to work this system. How many
volts does it need and how many watts does the motors put out.

If a clock aboard a space ship traveling at 0.900 c of the speed of light relative to earth chimes once at the beginning of the hour and again when it reads one hour later, how much time would an observer on earth say elapsed between the two chimes?

The most important difference between a wedge and an inclined plane is a. their size b. their shape c. how they are used d. what they are made of

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