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3 years ago

Help please!

Physics

2 answers:

Ne4ueva [31]3 years ago

8 0

Answer:

Spinning permanent magnets within an array of fixed permanent magnets

Explanation:

olchik [2.2K]3 years ago

5 0

Answer:

Definitely Spinning permanent magnets within an array of fixed permanent magnets

Explanation:

Any relative motion between magnets (be they permanent or electromagnetic) and a coil of wire will induce an electric current in the coil.

What will not induce an electric current is the relative motion between the two coils of wire (because there is no change in magnetic field), or the relative motion between two magnets (there are no coils of wire to induce the current into).

<em>Therefore, spinning permanent magnets within an array of fixed permanent magnets does not induce an electric current.</em>

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An electrical motor spins at a constant 2695.0 rpm. If the armature radius is 7.165 cm, what is the acceleration of the edge of

djyliett [7]

Answer:

Acceleration will be $5706.77rad/sec^2$

So option (D) will be correct answer

Explanation:

We have given angular speed of the electrical motor $\omega =2695rpm$

We have to change this angular speed in rad/sec for further calculation

So $\omega =2695rpm=2695\times \frac{2\pi }{60}=282.2197rad/sec$

Armature radius is given r = 7.165 cm = 0.07165 m

We have to find the acceleration of edge of motor

Acceleration is given by $a=\omega ^2r=282.2197^2\times 0.07165=5706.77rad/sec^2$

So acceleration will be $5706.77rad/sec^2$

So option (D) will be correct answer

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4 years ago

A block pushed along the floor with velocity V0 slides a distance d after the pushing force is removed. a) if the mass of the bl

KengaRu [80]

Answer:

$a) \ d_2=d_1\\b) \ d_2=4d_1$

Explanation:

Assume that the distance travelled initially is d.

In order to stop the block you need some external force which is friction.

If we use the law of energy conservation:

$E_i=E_f\\\frac{mv^2}{2}= E_{Friction}\\E_{Friction}=F_{Friction}*d\\F_{Friction}= \mu_kmg\\\frac{mv^2}{2}= \mu_kmgd\\ d=\frac{v^2}{2\mu_kg}$

Looking at the formula you can see that the mass doesn't affect the distance travelled, as lng as the initial velocity is constant (Which indicates that the force must be higher to push the block to the same speed) therefore the distance is the same.

b) If the velocity is doubled, then the distance travelled is multiplied by 4, because the distance deppends on the square of the velocity.

6 0

4 years ago

Newton's First Law says that an object at rest will stay at rest, and an object in motion will stay in motion unless:

Verdich [7]

Answer: Acted on by equal forces in opposite direction

Explanation:

Newton's First Law says that every body continue in its state of rest or constant speed on a straight line unless being acted upon by an external force.

6 0

4 years ago

PLEASE HELP ME IN THIS QUESTION!!!

kirill115 [55]

Answer:

Acceleration is 8.45 and the tension is 2.775

Explanation:

Lets apply the equation F=ma for vertical block,

5-T= 0.5a

foe the frictional force acting on the object,

f=0.11×5 (consider equation no.1)

=0.55N

Applying F=ma for the block which is on surface,

T-0.55=0.5a (consider as equation no.2)

no.1=no.2

5.55=2T

T=2.775

by equation no.1,

4.225=0.5a

a=8.45

8 0

3 years ago

The battery on your car has a rating stated in ampere-hours that permits you to estimatethelengthoftimeafullychargedbatterycould

KengaRu [80]

Answer:

E = 600 J

Explanation:

The power is

P = W / t = E / t

E = P t

The electrical power is

P = V I

We substitute

E = V I t

Let's calculate

E = 12 50 1

E = 600 J

This is the energy stored in the battery

5 0

3 years ago

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