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1cat2ferrets

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Posts posted by 1cat2ferrets

  1. Rocco has already acclimated himself to his cage and loves the toys I bought him. Trying to get him not to bite is tough, but he's learned to step up rather quickly. I love him so much and can tell he's very smart. I think he tried to say his name last night, too. Today was his (and mine) first bath which was very comical.

     

    Thanks again for the help and advice!

  2. and I'm sooo excited about it!! He's an African Grey parrot and he's 4 months old. He's absolutely beautiful!! I'm in love, but very nervous as he's

    my first bird ever. Anyone with any helpful tips would be greatly appreciated, to say the least. We named him Rocco and he's already trying to say it.

    Shadow, our cat, is a little put off about his new brother, but I'm sure they'll get along fine. Shadow and the ferrets were the best of friends, so I'm not worried about the cat/bird rivalry...LOL!!!

  3. 1. If a beam of visible light causes a piece of metal to eject electrons, do you think that a beam of gamma rays would cause the metal to eject electrons? Why or why not?

     

    2. The first scientists who worked with radioactive materials in the late 19th and 20th centuries did not realize how dangerous radiation was to their health. For example, 1903 nobel prize winner henri becquerel once placed a radioactive sample of barium in a glass tube, wrapped it in paper, put it in a cardboard box, and then left it in the jacket pocket of the coat he was wearing for 6 hours. When he removed the jacket, he discovered, to his surprise, that the radiation from the sample had burned his skin. What kind of radiation was responsible for becquerel's burn? How do you know?

     

    TIA for any help!

  4. Here it is and it has a few parts to it:

     

    1.a. Power lines carry electricity at about 120,000 volts. If a power line were stepped down by a transformer to 120 volts, how many turns would there be on the secondary coil if there were 1000 turns on the primary?

     

    b. if the secondary coil in part a is connected to a resistor with a resistance of 10 ohm's, what is the current in the secondary coil?

     

    c. what is the power in the secondary coil?

    d. what is the current drawn by the primary coil?

    e. why is it useful for the power lines to transfer electricity with a current of the magnitude of your answer in part d?

     

    Ok, this is a physics course but my son is studying electricity and magnetism. In the textbook it gives the following formula to use for part a, but he doesn't know what goes where.

     

    primary voltage/number of primary turns= secondary voltage/number of secondary turns

     

    Any help will be greatly appreciated!:001_smile:

  5. Here's 2 questions my son is having difficulty with.

     

    1 When rubbed with a piece of fur, an object which is a poor conductor:

    a, will probably become negatively charged because it holds its electrons tightly, b. will probably become positively charged because it holds electrons tightly, c. will probably become positively charged because it holds its electrons weakly, d. cannot become charged because its resistance is high.

    He thinks it's c.

     

    2. A scientist holds a charged rod 1m away from a charged sphere. If she moves the rod so that it's only 1/2m away from the sphere, the rod will experience: a. half the elecetrical force it originally experienced, b. the same electrical force as it originally experienced, c. twice the electrical force it originally experience, d. four times the electrical force it originally experience.

    he thinks it's b.

     

    TIA..let him know if he's right or wrong, please!

  6. Sorry there's one mpre problem and then I'll go away..LOL!!

     

    The electric charge of an electron is -1.6x10^-19C. What is the force exerted between two electrons separated by one meter? (Be sure to note whether the force is attractive or repulsive)

     

    Using this formula f=k*(q1*q2/d^2)

    where k= 9.0x10^9 Nm^2/c^2

    q1 and q2= -1.6x10^-19C

    d= 1m..We think?

     

    HELP!!

  7. Once again, my son and I are stumped on a few problems in wonderful physics and we're desperately looking for help from someone out there.

     

    Here's the problems:

     

    1. How much power does a light bulb connected to a 120V outlet use if it

    draws 0.5A of current?

     

    OK, I think my son got this one...current * Voltage=power so, 120V*0,5A=60Watts.

     

    One kilowatt-hour is a measure of energy which is equal to 3,600,000J. How many hours would you have to leave on the light bulb from the above problem in order to expend one kilowatt-hour? (remember that 1W=1J/s)

     

    In his textbook there's a formula energy=power *time.

    Plugging the numbers into it we get 3,600,000=60W*time.

    Now what? I know you have to get this equation: time= 60W/3600000, or time=3600000/60W ?

     

    If one kilowatt-hour costs $.10, how long would you have to leave the light bulb on from the above problem in order to spend $1.00 on electricity? This one cpmpletely has us stumped!!

     

    TIA to anyone who can help us!!

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