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VladimirAG [237]
3 years ago
14

Science help please! Urgent!

Physics
2 answers:
iren2701 [21]3 years ago
3 0
I<span>n </span>direct current<span> (</span>DC), the electric charge (current<span>) only flows in one direction. Electric charge in </span>alternating current<span> (</span>AC<span>), on the other hand, changes direction periodically. The voltage in </span>AC<span> circuits also periodically reverses because the </span>current<span> changes direction.</span>
Karo-lina-s [1.5K]3 years ago
3 0
26) The force felt py a charged particle in a magnetic field is given by Lorentz force:
F=q(vxB) where q is charge, v is velocity, and B is the field vector.
Positive particles have positive charge +q
Negative particles have negative charge -q
So the forces are in opposite directions (they spiral in opposite directions).

27) The coil of a galvanometer is put in a constant magnetic field.  When a current, I, is passed through the coil it creates a magnetic moment M=NIA where N is the turns of wire, A is the area of the loop, and I is current.  This moment feels a torque in the field is MxB  where "x" is the cross product.  So the coil is rotated in the field by an amount proportional to its current.

28) DC travels in one direction only.  AC changes directions twice per period. This makes it possible to transform the voltage later on, since Faraday's law requires the magnetic field created by a current to be changing in time.  This is the main reason we use AC


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Grace [21]
The correct answer is
<span>C) Amount of heat absorbed or released is doubled if quantity is doubled. If a different substance with half the specific heat capacity is used, the amount of heat absorbed or released is cut in half. 

In fact, the amount of heat released or absorbed is given by:
</span>Q=m C_s \Delta T
<span>where 
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Cs is the specific heat capacity of the material
</span>\Delta T is the change in temperature
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We can see that Q is directly proportional to both m (mass, or quantity of the substance) and Cs (specific heat capacity). So if the quantity (m) is doubled, the amount of heat (Q) is doubled as well. Similarly, if the specific heat capacity (Cs) is cut in half, the amount of heat (Q) is cut in half as well.</span>
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3 years ago
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Periodic Motion Problem, how to tackle this beast?
SSSSS [86.1K]
You can see the periodic motion as the projection over the diameter of a point moving with a circular motion.

The Amplitude will be the radius of the circumference and ω is the angular frequency (or speed) for both motions.

In the periodic motion, you will have maximum velocity at the center and it will be zero at the extremities, where the projection changes direction, while the acceleration will be maximum at the extremities and zero at the center.

The displacement will then be:
x(t) = A · cos(ωt)
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4 0
3 years ago
Can someone please give me the (Answers) to this? ... please ...<br><br> I need help….
tensa zangetsu [6.8K]

Answer:

1320 kg I think

Explanation:

Here you can just substitute into the equation. ∆v means change in speed

this gives you (1100x24)/20

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Source:https://starchild.gsfc.nasa.gov/docs/StarChild/questions/question5.html

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3 years ago
What sort of historical data can a glacier provide through an ice core?
ElenaW [278]

Answer:

past temperature, composition of gases in the atmosphere

Explanation:

Cylindrical cones can be drilled out from the core of glaciers to calculate past temperatures. The air bubbles in the cones can also be used to determine the composition of air in the past yars. This information provides us a means to analyze the trend of global warming and change in concentratinos of green house gases over the years.

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