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AysviL [449]
3 years ago
12

Consider a disk of radius 4.9 cm, having a uniformly distributed charge of +6.1 μC. The value of the Coulomb constant is 8.98755

x 10 N m2/C2 Compute the magnitude of the electric field at a point on the axis and 3.1 mm from the center Answer in units of N/C.

Physics
1 answer:
gayaneshka [121]3 years ago
5 0

Answer:

the electric field is 42.8×10^6 N/C

Explanation:

let k be the coulomb constant, Q be the charge distribution , R be the radius of the disk and x be the distance from the center.

k = 8.98755×10^9 N×m^2/c^2

Q = 6.1×10^-6 C

R = 4.9×10^-2 m

x = 3.1×10^-3 m

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A 6.00 g lead bullet traveling at420 m/s is stopped by a large
Westkost [7]

Answer:

The increase in temperature of the bullet is 351.1 kelvin

Explanation:

First, we should find the kinetic energy of the bullet is:

K=\frac{mv^{2}}{2}=\frac{(6\times10^{-3}\,kg)(420\,\frac{m}{s})^{2}}{2}

with m the mass and v the velocity.

K=529.2 J

Now we know that half of the kinetic energy of the bullet is transformed into internal energy, by second's law of thermodynamics that means heat (Q) to raise bullet temperature (T), so:

Q=\frac{K}{2}= 264.6\,J

To know what the increase in temperature is, we should use specific heat of lead:

c=125.604 \frac{J}{kg\.K}

The equation that relates specific heat, change in temperature and mass is:

Q=cm\varDelta T

solving for \varDelta T:

\varDelta T=\frac{Q}{cm}=\frac{264.6}{(125.604)(6\times10^{-3})}

\varDelta T= 351.10\, K

4 0
2 years ago
A uniform rod is set up so that it can rotate about an axis at perpendicular to one of its ends. The length and mass of the rod
guapka [62]

Answer:

F = 0.179 N

Explanation:

given,

length of the rod = 0.759 m

mass of the rod = 1.03 kg

force = ?

initial angular speed = 0 rad/s

final angular speed = 6.87 rad/s

time interval = 9.95 s

the angular acceleration

\alpha = \dfrac{\omega_f-\omega_i}{\Delta t}

\alpha = \dfrac{6.87 -0}{9.95}

\alpha =0.690\ rad/s^2

moment inertial of the rod

I =\dfrac{mL^2}{3}

torque produced by the rod τ = I α

torque is also equal to τ = F L

now,

F L =  I α

F L=(\dfrac{mL^2}{3})\times \alpha

F= (\dfrac{1.03\times 0.759}{3})\times 0.690

F = 0.179 N

5 0
3 years ago
Read 2 more answers
Please help me find the answer
anygoal [31]
B-thymine nucleotides is the answer i am sure
8 0
3 years ago
At the instant a traffic light turns green, a car starts with a constant acceleration of 1.3 m/s2. At the same instant a truck,
Bas_tet [7]

Answer:

(a) Distance traveled = 75.3846 m

(b) Velocity of car at that instant will be 14 m/sec

Explanation:

We have given acceleration of the car a=1.3m/sec^2

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(a) According to second equation of motion we know that s=ut+\frac{1}{2}at^2

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0.65t^2=7t

t=10.769sec

So distance traveled s_c=s_t=7\times 10.769=75.3846m

(b) From second equation of motion we know that v = u+at

So v = 0+1.3×10.769 = 14 m /sec

7 0
2 years ago
Surface currents are caused by what?
tigry1 [53]
The Coriolis<span> Effect causes winds and currents to form circular patterns. The direction that they spin depend on the hemisphere that they are in. 
I hope this helped God bless.</span>
8 0
3 years ago
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