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Ivanshal [37]
3 years ago
14

The metric prefix milli- means:

Physics
2 answers:
butalik [34]3 years ago
8 0

1000 times smaller. i took the test

Ray Of Light [21]3 years ago
4 0
The answer is A. 1000 times smaller

The metric prefix mili- is used to signify something 1000 times smaller than a measure. For example in 1 meter there are 1000 milimeters. Therefore; A is correct.

Hope this helped. Have a great night!
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two 200 pound lead balls are separated by a distance 1m. both balls have the same positive charge q. what charge will produce an
Anna [14]

Answer:

The  charge is  q = 3.14 *10^{-4} \  C

Explanation:

From the question we are told that

     The mass of each ball is  m  =  200 \ lb  =  \frac{200}{2.205}  =  90.70 \ kg

       The distance of separation is  d =  1 \ m

Generally the weight of the each ball is mathematically represented as  

      W  =  m  *  g

where g is the acceleration due to gravity with a value g  =  9.8 m/s^2

substituting values

      W  = 90.70  * 9.8

      W  = 889 \ N

Generally  the electrostatic force between this balls is mathematically represented as

         F_e  =  \frac{k  *  q_1* q_2  }{d^2}

given that the the charges are equal we have

    q_1= q_2 = q

So

         F_e  =  \frac{k  *  q^2  }{d^2}

Now from the question we are told to find the charge when the weight of one  ball is equal to the electrostatic force

So  we have

       889 =  \frac{9*10^9 *  q^2}{1^2}

   =>   q = 3.14 *10^{-4} \  C

       

5 0
3 years ago
An electron moves in a circular path perpendicular to a magnetic field of magnitude 0.220 T. If the kinetic energy of the electr
Gwar [14]

Answer:

971605.66\ \text{m/s}

25.1\ \mu\text{m}

Explanation:

m = Mass of electron = 9.11\times 10^{-31}\ \text{kg}

B = Magnetic field = 0.22 T

K = Kinetic energy of electron = 4.3\times 10^{-19}\ \text{J}

q = Charge = 1.6\times 10^{-19}\ \text{C}

v = Velocity of electron

r = Radius of curved path

Kinetic energy is given by

K=\dfrac{1}{2}mv^2\\\Rightarrow v=\sqrt{\dfrac{2K}{m}}\\\Rightarrow v=\sqrt{\dfrac{2\times 4.3\times 10^{-19}}{9.11\times 10^{-31}}}\\\Rightarrow v=971605.66\ \text{m/s}

The speed of the electron is 971605.66\ \text{m/s}

The force balance of the system is given by

qvB=\dfrac{mv^2}{r}\\\Rightarrow r=\dfrac{mv}{qB}\\\Rightarrow r=\dfrac{9.11\times 10^{-31}\times 971605.66}{1.6\times 10^{-19}\times 0.22}\\\Rightarrow r=0.0000251=25.1\ \mu\text{m}

The radius of the curved path is 25.1\ \mu\text{m}

6 0
3 years ago
From the small number of impact craters on ____, planetary geologists suspect that virtually all its original surface has been c
allsm [11]

<span>From the small number of impact craters on moon, planetary geologists suspect that virtually all its original surface has been covered over by younger volcanic activity</span>. Most of the Moon's surface is densely covered with craters, but we find relatively few craters within the lunar maria.<span> </span>

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4 years ago
What is the specific heat of water?
Sergeeva-Olga [200]

Answer:

A) 4.18 J/g°C

Explanation:

8 0
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Read 2 more answers
Find the missing spaces in the charts below! Please!
Neko [114]

Answer:

Zinc- Zn

Mass Numbers:

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Protons:

Tin-50

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35 neutrons in zinc

iodine-

atomic number- 53

78 neutrons

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atomic number 17

18 neutrons

17 electrons

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symbol Br

35 protons

45 neutrons

35 electrons

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protons and electrons 13

neutrons 14

atomic number 14

fe+2

26 protons

24 electrons

30 neutrons

ferrous iron

Cu+1  copper

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proton and electron 29

neutron 35

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