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Karo-lina-s [1.5K]
4 years ago
9

You need to prepare a 0.199-mm-diameter tungsten wire with a resistance of 3.09 kÏ. how long must the wire be? the resistivity o

f tungsten is 5.62 à 10-8 Ï·m.
Physics
1 answer:
jekas [21]4 years ago
7 0
<span>1.71x10^3 meters. The resistivity of a conductor with an uniform cross section is expressed as R = pl/A where p = resistivity l = length of conductor A = cross sectional area of conductor. Solving for l gives R = pl/A RA = pl RA/p = l The cross section is defined a A = pi r^2, so A = 3.14159 * (9.95x10^-5 m)^2 A = 3.14159 * 9.90025x10^-9 m^2 A = 3.11025x10^-8 m^2 Now substitute the known values into the formula, giving: RA/p = l 3090 ohm * 3.11025x10^-8 m^2 / 5.62x10^-8 ohm * m = l 1.71009x10^3 m Rounding to 3 significant places gives 1.71x10^3 meters.</span>
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A wheel starts from rest and rotates with constant angular acceleration to reach an angular speed of 11.2 rad/s in 3.07 s. (a) f
Hitman42 [59]
(a) The angular acceleration of the wheel is given by
\alpha =  \frac{\omega_f - \omega_i }{t}
where \omega_i and \omega_f are the initial and final angular speed of the wheel, and t the time.

In our problem, the initial angular speed is zero (the wheel starts from rest), so the angular acceleration is
\alpha =  \frac{(11.2 rad/s) - 0}{3.07 s} =3.65 rad/s^2

(b) The wheel is moving by uniformly rotational accelerated motion, so the angle it covered after a time t is given by
\theta (t) = \omega_i t +  \frac{1}{2} \alpha t^2
where \omega_i = 0 is the initial angular speed. So, the angle covered after a time t=3.07 s is
\theta=  \frac{1}{2}  \alpha t^2 =  \frac{1}{2}(3.65 rad/s^2)(3.07 s)^2 = 17.2 rad
6 0
3 years ago
PLEASE HELP
Gennadij [26K]

Answer:

3.675 m

Explanation:

a_{x} =0 v_{xo}=100 a_{y} =-g  v_{yo}=0

X-direction     | Y-direction

R=x_{o}+ v_{xo} t  | y=y_{o}+v_{yo}t+\frac{1}{2}a_{y}t^2

75=100t         |y=0+0+\frac{1}{2} (9.8)(0.75)

\frac{75}{100} =t             | y=3.675 m

0.75s=t              

Hope it helps

3 0
3 years ago
Would a limestone building weather more rapidly in Homer, Alaska, or in Honolulu, Hawaii? Explain your reasoning.
Vinvika [58]
Hawaii for sure. 

Well, Hawaii is hot (most of the time I think) and Alaska is always freezing (or at least cold). So hawaii. 
8 0
3 years ago
What is the primary difference between an ideal emf device and a real emf device?.
EleoNora [17]

Answer:

A real emf device has an internal resistance, but an ideal emf device does not.

3 0
2 years ago
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Kate must do 39 days of training each year as a naval reservist. How will she serve that time?
elixir [45]

Answer:

c

Explanation:

i did the test

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3 years ago
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