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Hitman42 [59]
3 years ago
5

Dark areas on the surface of the Sun that exhibit intense magnetic activity are

Physics
2 answers:
Radda [10]3 years ago
7 0
A. sunspots
a spot or patch appearing from time to time on the suns surface, appearing dark by contrast with its surroundings, hope this helps
svp [43]3 years ago
6 0
I think it's A) Sunspots. I hope this helps:)    
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In braking an automobile, the friction between the brake drums and brake shoes converts the car's kinetic energy into heat. If a
satela [25.4K]

To solve this problem it is necessary to apply the concepts related to energy conservation.

In this case the kinetic energy is given as

KE = \frac{1}{2} mv^2

Where,

m = mass

v= Velocity

In the case of heat lost energy (for all 4 wheels) we have to

Q = mC_p \Delta T \rightarrow 4Q = 4mC_p \Delta T

m = mass

C_p = Specific Heat

\Delta T= Change at temperature

For conservation we have to

KE = Q

\frac{1}{2} mv^2 = 4mC_p \Delta T

\Delta T = \frac{1}{2}\frac{mv^2}{4mC_p}

\Delta T = \frac{1}{2}\frac{(1500)(30)^2}{4(8)(448)}

\Delta T = 47.084\°C \approx 47\°C

Therefore the temperature rises in each of the four brake drums around to 47°C

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3 years ago
While sleeping, a 15.5 kg dog exerts a downward force on the ground. What is the magnitude of the upward force being exerted on
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3 years ago
What is the electric force between a +2 µC point charge and a –2 µC point charge if they are separated by a distance of 5.0 cm?
mrs_skeptik [129]
The electrostatic force between two point charges is given by:
F=k_e  \frac{q_1 q_2}{r^2}
where
k_e = 8.99 \cdot 10^9 Nm^2 C^{-2} is the Coulomb's constant
q1 and q2 are the two charges
r is the distance between them

In our problem, charge 1 is
q_1 = +2 \muC = +2.0 \cdot 10^{-6}C
while charge 2 is
q_2 = -2 \mu C=-2.0 \cdot 10^{-6} C
and their distance is
r=5.0 cm=0.05 m

So, the electrostatic force between them is
F=(8.99 \cdot 10^9 Nm^2C^{-2}) \frac{(+2\cdot 10^{-6}C)(-2 \cdot 10^{-6}C)}{(0.05 m)^2} =-14.4 N

And the negative sign means the force is attractive, because the two charges have opposite sign.
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3 years ago
When iron combines with oxygen to form iron oxide, a chemical reaction has occurred.
REY [17]
It is true for this question
6 0
3 years ago
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When you observe the world and see something that you don't understand, you make a hypothesis that you try to prove. This either
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Just like the water cycle, rocks undergo changes of form in a rock cycle. A metamorphic rock can become an igneous rock, or a sedimentary rock can become a metamorphic one. Unlike the water cycle, you can’t see the process happening on a day-to-day basis. Rocks change very slowly under normal conditions, but sometimes catastrophic events like a volcanic eruption or a flood can speed up the process. So what are the three types of rocks, and how do they change into each other? Keep reading to find out!



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4 years ago
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