Some scientists have suggested that spacecraft with sails of the kind described above could be propelled by lasers. Suppose that such a sail is constructed of a highly reflective material thin enough so that one square meter of the sail has a mass of just 3.30e-3 kg. The sail is to be propelled by an ultraviolet laser beam (wavelength 223 nm) that will strike its surface perpendicularly.(a) Use the impulse-momentum theorem to determine the number of photons per second that must strike each square meter of the sail in order to cause an acceleration of 9.80e-6 m/s^2, which is one million times smaller than the gravitational acceleration at the earth's surface. Assume that no other forces act on the sail, and that all the incident photons are reflected.(b) Determine the intensity (power per unit area) that the laser beam must have when it strikes the sail.
BEFORE TAKING PICTURE ASK THEM IF THEY CAN SHOW THEMSELVES SO YOU CAN TAKE THERE PICTURE AS STUPID AS THIS MAY SOUND YOU WILL GET BETTER PICS OF GHOSTS BY ASKING THAN NOT,ALSO IF YOU RECORD EVP ASK SIMPLE QUESTIONS AND GIVE UP TO 30SECONDS FOR A RESPONSE MOST TIMES YOU WON'T HEAR ANYTHING UNTIL YOU REWIND AND PLAYBACK IF IT ALL POSSIBLE USE A DIGITAL VOICE RECORDER IF NOT THEN A TAPE RECORDER WITH A SEPARATE MIC. OTHERWISE YOU WILL GET A LOT OF MOTOR NOISE ON YOUR RECORDINGS WHICH WILL INTERFERE WITH HEARING ANY GHOSTLY VOICES.
you can use rollers. or an easier way to do it is to get your hair wet, then braid it (fairly big, tight braids), and leave it overnight. In the morning let your hair out and run some gel through it.
Yes, that is just a plastic screw or mine was and i got some from the dealer where i bought the bike and helmet. If it aint broke don't fix it.
