Consider a person attending a concert being broadcast over the radio, sitting about 45 meters from the stage. The person listens to the radio broadcast with a transistor radio over one ear and the non-broadcast sound signal with the other ear. Further suppose that the radio signal must travel all the way around the world before reaching the ear.

What time does the radio signal or the sound signal will reach person?

Same time or different time Explain why?

Distance = 45 meters
Light speed = ? meter / sec
Sound speed = ? meter / sec

! 55 !  

write a paragraph or story to explain the transformation between potential and kinetic energy as shown in your picture or model.  

you should have at least 5 complete sentences with a main idea and supporting details.  

you must include the following words:  

potential energy

kinetic energy

mechanical energy

conservation of energy

dude, this is hard lol : ))

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm.   the wire diameter is d = 0.9 mm.   the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a                                          

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2)   in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation:

d eras and periods

490 n

f=125n a=2.5m/s2