What 3 things can an object with unbalanced forces do?

1 answer:

3 0

Forces are considered balanced when all of the combined forces lead to no change in the motion of the object. For example, when a book is sitting on a table, the force of gravity is pushing downward and the normal force is pushing upward with exactly the same amount of force. Since they are equal and opposite forces, the book does not move.

Unbalanced forces exist when there are unequal forces acting upon the object, which leads to a change in the state of motion. Unbalanced forces can lead to a change in direction, a change in speed, or both a change in direction and in speed.

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Do electrical appliances like heaters, toasters and heating pads have high or low resistance (remember for constant voltage, p =

Semenov [28]

The correct answer is low resistance.

A heating element's resistance is neither "extremely high" nor "very low." Since the amount of heat produced by the circuit is proportional to the current, the resistance of the heating element must be low enough to draw the necessary current. Thus, low resistance is the general characteristic of electrical devices like warmers, toasters, and heating pads. Any voltage will experience high current if resistance is too low. Current will be low if resistance is too high and voltage is okay. NOTE: Current increases as resistance decreases and decreases as resistance increases while the voltage remains constant, like in an automotive circuit.

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2 years ago

All of the following are ways to induce an emf in a loop of wire except which one? a. Move the loop into or out of a magnetic fi

vodka [1.7K]

Faraday's law of induction states the following:
$\varepsilon=-\frac{d\Phi}{dt}$
The strength of the induced electromotive force is equal to the negative of the time rate of change of the magnetic flux enclosed by the circuit.
Knowing all this, we can conclude that the answer is C.
Flux can be understood as the number of field lines interesting with the area of the loop. You can simply think that stronger field has more field lines. This is just a useful simplification.
When you simply move the loop along the lines of magnetic field there is no change in flux. If you are rotating or moving the loop in and out of the field you are changing the are of the loop that intersects with the field and thus you are changing the flux. The same thing happens when you have a changing field, the only difference being that field is doing all the work for you.

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4 years ago

True or false? a Movable pulley does not provide mechanical advantage.<br><br>False<br><br>True

shepuryov [24]

Answer:

i think its false i hope u get it correct

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3 years ago

In order to be a good conductor, a martial needs to...

Travka [436]

B-allow electrons to flow

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3 years ago

A sphere of radius 5.15 cm and uniform surface charge density +12.1 µC/m2 exerts an electrostatic force of magnitude 35.9 ✕ 10-3

rosijanka [135]

The radius of the sphere is r=5.15 cm=0.0515 m, and its surface is given by
$A=4 \pi r^2 = 4 \pi (0.0515 m)^2 = 0.033 m^2$

So the total charge on the surface of the sphere is, using the charge density
$\rho=+1.21 \mu C/m^2 = +1.21 \cdot 10^{-6} C/m^2$ :
$Q= \rho A = (+1.21 \cdot 10^{-6} C/m^2)(0.033 m^2)=4.03 \cdot 10^{-8}C$

The electrostatic force between the sphere and the point charge is:
$F=k_e \frac{Qq}{r^2}$
where
ke is the Coulomb's constant
Q is the charge on the sphere
$q=+1.75 \muC = +1.75 \cdot 10^{-6}C$ is the point charge
r is their separation

Re-arranging the equation, we can find the separation between the sphere and the point charge:
$r=\sqrt{ \frac{k_e Q q}{F} }= \sqrt{ \frac{(8.99 \cdot 10^9 Nm^2 C^{-2})(4.03 \cdot 10^{-8} C)(1.75 \cdot 10^{-6}C)}{35.9 \cdot 10^{-3}N} }=0.133 m=13.3 cm$

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3 years ago