PHYSICS HIGH SCHOOL

A ___ is used in a motor to switch the direction of the magnetic field created by the current.The rotating part of a motor that holds the electromagnets is called the _.
Electric current passes through the _ and into the electromagnets in an electric motor.
A motor turns _ energy into ___ energy.

Answers

Answer 1

Answer:

Answer:

A _commutator_ is used in a motor to switch the direction of the magnetic field created by the current.

The rotating part of a motor that holds the electromagnets is called the __armature___.

Electric current passes through the _brushes_ and into the electromagnets in an electric motor.

A motor turns _electrical_ energy into _mechanical_ energy.

Explanation:

A commutator, which is a split ring rotary switching device, reverses the direction of the current between the external circuit and the rotor. Reversing the current reverses the magnetic field.

The armature comprises the rotating part of the motor and the electromagnets

A brush is the electrical contact for conducting current through the moving and stationary parts of an electric motor

An electric motor turns electrical energy into mechanical energy.

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The toxic effects of water pollution are generally
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Si el sonido no atraviesa las paredes entonces, ¿por qué se escuchan las voces de los vendedores dentro de nuestra casa aún cuando las puertas y las ventanas estén cerradas?

Answers

Answer:

DE HECHO EL SONIDO DÍ PUEDE ATRAVESAR LAS PAREDES, PERO

CUANDO ENTRA EN LA PARED, EL SONIDO VIAJA MÁS RÁPIDO QUE EN EL

AIRE Y CUANDO SALE DEL OTRO LADO, EL SONIDO VA A UNA

VELOCIDAD ALTA, POR ESTO LSA VOCES SE ESCUCHAN AUNQUE NO

MUY CLARAS.

Explanation:

Before we can use parallax to measure the distance to a nearby star, we first need to know:?a. the distance to the nearest star besides the Sun
b. the month in which the star is observed
c. the Earth-Sun distance
d. the Sun's mass

Answers

The correct answer for the question that is being presented above is this one: "c. the Earth-Sun distance." Before we can use parallax to measure the distance to a nearby star, we first need to know the Earth-Sun distance. The correct option among all the options that are given in the question is the third option or option "C". Astronomers normally use parallax for measuring the distances of the stars that are nearby.

Three balls leave the edge of a table at the same time. Ball A rolls off the table with an initial horizontal velocity. Ball B is launched at an angle and has both an initial horizontal and vertical velocity. Ball C is dropped from rest, and has no initial velocity.a) Explain which one(s) hit the ground first.

b) Explain which one(s) hit the ground last

Answers

Explanation:

Balls A and C have the same initial vertical velocity of zero. Therefore, they land at the same time.

Ball B has a positive initial vertical velocity, so it hits the ground last.

Recall that the height of an object t seconds after it begins moving when gravity is the only force acting on the object is given. h(t)=-16x^2 + v0t + h0. h(t) is given in feet. v0 = initial velocity of object in ft/sec. ho= initial height of object in feet. If the feather is dropped from the top of the bridge 90 feet above a river, how long does it take the feather to reach the water?

Answers

That's pretty easy, have a look :

$h(t)=−16x2=v0t+h0$
$v0=0 ft/sec$
$h0=90 ft$

The only thing you need to do is to find t and the problem is solved.

Answer:

Time taken, t = 2.37 seconds

Explanation:

It is given that,

Height of an object at time t is given by :

$h(t)=-16t^2+v_0t+h_0$

Where

v₀ is initial velocity of object

h₀ is initial height of the object

The feather is dropped from the top of the bridge 90 feet above a river. we have to find the time taken by the feather to reach the water.

At the surface of water, h(t) = 0 and v₀t = 0

So, $0=-16t^2+0+90$

t = 2.37 seconds

The feather will take 2.37 seconds to reach the water surface.

Flatworms can be cut in half, creating two new individuals, by _____.binary fission
multiple fission
fragmentation
budding

Answers

Flatworms can be cut in halfcreating two individuals by binary fission. Binary fission is a type ofasexual reproduction in which the offspring has the same features andcharacteristics of the parent. During binary fission, the DNA replicates intotwo and goes at the end of each membrane. And then the cell membrane divides intotwo daughter cells. Then cytokinesis follow.

Answer:

If you think about you're cutting and Flatworm in half. Flatworms don't naturally divide/create new individuals by binary fission. So, the answer would be c) fragmentation; based on the fact that you are the one cutting the Flatworm, not the other way around.

Two bowling balls each have a mass of 6.9-kg.They are located next to each other with their centers 21.8-cm apart.What gravitational force do they exert on each other

Answers

We can start with Newton's Law of Universal Gravitation, which is
$F_(grav) = (G. m_(1) .m_(2))/d^(2)$
Otherwise known as... The force due to gravity between two objects is equal to G ( a universal constant G = 6.673 x 10-11 N m2/kg2) times the mass of the first object (kg) times the mass of the second object (kg) all divided by the distance between the two objects squared.

We can thus plug in the given values to receive the answer...
$F_(grav)=(6.673x10^(-11).(6.9)^(2))/(0.218)^2$
I converted the 21.8cm into 0.218m, for the equation calls for meters.

I hope this helps!
P.S. I'm currently enrolled in IB Physics, so if you have any more questions, feel free to contact me for help.

Final answer:

The gravitational force between two 6.9 kg bowling balls, which are 21.8 cm apart, is approximately 1.99 x 10^-9 Newtons, showing the relative weakness of gravitational forces at an everyday scale.

Explanation:

The gravitational force between two objects can be calculated using Newton's law of universal gravitation. The formula for this force is F = G * (M1 * M2) / R^2, where F is the force, G is the universal gravitational constant (6.67 × 10^-11 Nm^2/kg^2), M1 and M2 are the masses of the two objects, and R is the distance between the objects.

In this scenario, each of the bowling balls has a mass of 6.9 kg and their centers are 21.8 cm (or 0.218 m) apart. Substituting these values into the formula, we get the gravitational force to be approximately 1.99 x 10^-9 Newtons. This value is quite small, which is consistent with our intuition that everyday objects like bowling balls don't seem to attract each other noticeably — this is because the gravitational force is extremely weak in comparison to other forces such as electromagnetic forces.

Learn more about Gravitational Force here:

brainly.com/question/32609171

#SPJ3

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