A coil of wire, a battery, a few paper clips, and a thermometer are on a table of supplies
What other material or materials would be needed for a student to construct a basic electric motor?
A)A magnet
B)Some tape
C)An electric generator
D)Alligator clips and a plastic cup

Answer:

Mass of the box = 0.9433 kg

Explanation:

Mass of racket-ball [tex](m_1)[/tex] = 0.00427 kg

Velocity of racket-ball before collision [tex](v_{1i})[/tex] = 22.3 m/s

Velocity of racket-ball after collision with box [tex](v_{1f})[/tex] = -11.5 m/s

[Since ball is bouncing back, so velocity is taken negative.]

Velocity of the box before collision [tex]v_{2i}[/tex] = 0 m/s

[Since the box is stationary, so velocity is taken zero]

Velocity of box moving forward after collision [tex]v_{2f}[/tex]= 1.53 m/s

To find the mas of the box [tex]m_2[/tex].

By law of conservation of momentum we have:

Momentum before collision = Momentum after collision

This can be written as:

[tex]p_i=p_f[/tex]

[tex]m_1v_{1i}+m_2v_{2i}=m_1v_{1f}+m_2v_{2f}[/tex]

We can plugin the given value to find [tex]m_2[/tex]

[tex](0.0427\times 22.3)+(m_2\times 0)=(0.0427\times (-11.5))(m_2\times 1.53)[/tex]

[tex]0.9522+0=-0.4911+1.53m_2[/tex]

Adding both sides by 0.4911

[tex]0.9522+0.4911=-0.4911+0.4911+1.53m_2[/tex]

[tex]1.4433=1.53m_2[/tex]

Dividing both sides by 1.53.

[tex]\frac{1.4433}{1.53}=\frac{1.53m_2}{1.53}[/tex]

[tex]0.9433=m_2[/tex]

∴ [tex]m_2=0.9433[/tex] kg

Mass of the box = 0.9433 kg (Answer)

Answer:

0.9433

Explanation:

Answer:

The best options from the answer choises above would be Opption B.

Explanation:

Gravitational forces are equal in both directions.

good luck.

Answer:

360 kJ

Explanation:

Energy = power × time

E = 600 J/s × (10 min × 60 s/min)

E = 360,000 J

E = 360 kJ

Using a 600 watt stove and oven for 10 minutes results in an energy consumption of 0.1 kilowatt-hours (kWh),

Using the formula:

Energy (in watt-minutes) = Power (in watts)× Time (in minutes)

For a 600 watt stove:

Energy = 600 watts× 10 minutes

= 6000 watt-minutes

However, energy consumption is usually expressed in kilowatt-hours (kWh). To convert watt-minutes to kilowatt-hours, use the following conversion:

1 watt-minute = 1/60,000 kilowatt-hour

Therefore:

Energy = 6000 watt-minutes× (1/60,000) kWh/watt-minute

= 0.1 kWh

The 600 watt stove and oven can do 0.1 kWh of work in 10 minutes.

2. The material dissolves

The Question tests the understanding of chemical change and whether we know the signs that show its occurrence.

First we need to know what is chemical change;

Second we need to identify the signs that indicate the occurrence of a chemical change

To find the radius of a planet with a gravitational field twice that of Earth's and half the mass, the radius is calculated to be half of Earth's radius.

The magnitude of the gravitational field strength g on a planet is given by the equation g = G(M/R^2), where G is the universal gravitation constant, M is the planet's mass, and R is the planet's radius. Given that the gravitational field on the surface of the particular planet is 2g where g is Earth's gravitational field, and the planet's mass is half of Earth's mass, we can derive the planet's radius in terms of Earth's radius Rg. Setting up the proportion (G(1/2M_Earth)/(R^2)) / (G(M_Earth)/(Rg^2)) = 2, and simplifying, we find that R^2 = (1/4)Rg^2. Taking the square root of both sides gives us the final relation R = (1/2)Rg.

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Answer:

B. 50 m/s²

Explanation:

Given:

Initial velocity of the ball is, [tex]u=0\ m/s[/tex]

Final velocity of the ball is, [tex]v=45\ m/s[/tex]

Time taken by the  ball is, [tex]t=0.9\ s[/tex]

Acceleration is defined as the rate of change of velocity. So, the velocity of the ball is changing with time. So, acceleration is given as:

[tex]a=\frac{v-u}{t}[/tex]

Plug in 0 for 'u', 45 for 'v', 0.9 for 't' and solve for acceleration, 'a'. This gives,

[tex]a=\frac{45-0}{0.9}\\\\a=\frac{45}{0.9}\\\\a=50\ m/s^2[/tex]

Therefore, the acceleration of the ball is 50 m/s².

Answer:

The rate of change of position in which the same distance is traveled each second is called uniform velocity.

Explanation:

The rate of change of position where the same distance is traveled each second is known as speed, and when this rate is constant, the object has a constant speed.

The rate of change of position in which the same distance is traveled each second is referred to as speed. Speed is a measure of how quickly an object moves from one place to another. It is calculated by dividing the distance covered by the time it takes to travel that distance. For instance, if a train travels 120 kilometers in 2 hours, its speed would be calculated as 120 divided by 2, giving a speed of 60 kilometers per hour.

In the case where the rate of change of position is constant over time, the object is said to be moving with constant speed. This means that the object covers equal distances in equal intervals of time, no matter how small these time intervals are. An example of this would be a car moving at a steady 50 kilometers per hour, implying that every hour, it travels exactly 50 kilometers, and in every second, it travels approximately 13.9 meters.

66 kgm/s

We are given;

We are required to determine the momentum of the object;

In this case;

Momentum = 22 m/s × 3 kg

                  = 66 kgm/s

Thus, the momentum of the object is 66 kgm/s

Answer: 90m

Explanation:

Use Equation for distance:

S=a*t²/2

use eqation for acceleraton a=(Vf-Vs)/t

Vs- starting speed

Vf - final speed

a-accelaration

---------------------------------

a=5m/s²

Vs=0m/s

Vf=30m/s

use

a=(Vf-Vs)/t

to find time

t=(Vf-Vs)/a

t=30m/s/5m/s²

t=6s

Now calculate distance that object travel using:

S=(a*t²)72

s=(5m/s²*(6s)²)/2

S=90m

If an object initially at rest accelerates at 5 meters per second² until it attains a speed of 30 meters per second, then the distance traveled by the object would be 90 meters.

There are three equations of motion given by  Newton,

v = u + at

S = ut + 1/2×a×t²

v² - u² = 2×a×s

As given in the problem an object initially at rest accelerates at 5 meters per second2 until it attains a speed of 30 meters per second.

By using the third equation of motion given by newton

v² - u² = 2×a×s

30² - 0² = 2*5*s

10s = 900

s = 900 / 10

  =90 meters

Thus,If an object initially at rest accelerates at 5 meters per second² until it attains a speed of 30 meters per second, then the distance traveled by the object would be 90 meters.

Learn more about equations of motion here, refer to the link;

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Answer:

The final velocity of the ship is, v = 136050000 m/s

The total distance covered, s = 6.94 x 10¹⁷ m

Explanation:

Given data,

The constant acceleration of the space ship, a = 75 m/s²

The time period of the space ship acceleration is t = 3 weeks

                                                                                   t = 1.814 x 10⁶ s

The initial velocity of the ship is u = 0 m/s

The final velocity of the ship is,

                                    v = u + at

                                       = 0 + 75 (1.814 x 10⁶)

                                       = 136050000 m/s

The distance space ship traveled, can be calculated from the second equation of motion.

                                   s = ut + ½ at²

                                      = 0 + ½ 75 (136050000)²

                                       = 6.94 x 10¹⁷ m

Hence, the total distance covered, s = 6.94 x 10¹⁷ m

The force is 1.5N acting downward or -1.5N.

Why?

To answer this question, we need to remember the Newton's Third Law. This Law states that for every force applied upon an object, there is an equal force acting in the opposite direction. This Law is also called "action-reaction Law".

So, if the force of the players heads applied on the ball is equal to 1.5N (upward), the force applied by the force on the players heads will be exactly equal, but with opposite direction, or -1.5N (downward).

Have a nice day!

Answer:

Your answer is the rock pillar, the second image.

Explanation:

I'm an edg user too.

An ionic bond is formed when there's an equal exchange of electrons between atoms. This differs from other bond types like covalent bonds, where electrons are shared. Sodium chloride (NaCl) is a typical example of this kind of bond.

The chemical bond that's formed when an equal exchange of electrons occurs is the ionic bond. An ionic bond is a type of chemical bond that occurs when an atom transfers one or more electrons to another atom. This is different from a covalent bond where the electrons are shared, rather than exchanged. For example, when the sodium atom (Na) transfers an electron to the chlorine atom (Cl), they form an ionic bond and become a sodium chloride (NaCl) molecule.

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Answer:

1737.8 N

Explanation:

Given information

[tex]F_1= 821 N[/tex]

[tex]F_2= 1140 N[/tex]

[tex]\theta_1=32^{\circ}[/tex]

[tex]\theta_2=26^{\circ}[/tex]

Net force, [tex]F_{net}=F_1 cos \theta_1+F_2 cos \theta_2=821cos 32^{\circ}+ 1140 cos 26^{\circ}=1737.833662 N \approx 1737.8 N[/tex]

Answer:

The statement that best describes insulators is "Electrons within their atoms are strongly held by the nuclei"

Explanation:

Atoms are constituted by a nucleus with positive charge (protons and neutrons), around which negative charges (electrons) revolve.

Substances that have a huge amount of "free electrons" that can move through the material are called conductors. This is due to the low resistance to the movement of the load or electric current.

Materials that do not conduct electricity are called insulators. In this case the electrons are strongly bound to the nucleus and cannot move freely. In this way a great resistance to the flow of electric current is offered.

Finally, semiconductors are the materials that can have electrical properties of conductors or insulators.

So the statement that best describes insulators is "Electrons within their atoms are strongly held by the nuclei"

Answer:

it has a high resistivity because it opposes the movement of electrons

Explanation:

Answer:

2.5 kg.m/s

Explanation:

Taking left side as positive while right side direction as negative then

Momentum, p= mv where m is the mass of the object and v is the velocity of travel

Momentum for ball moving towards right side=mv=2.5*-3=-7.5 kg.m/s

Momentum for the ball moving towards the left side=mv=2.5*4=10 kg.m/s

Total momentum=-7.5 kg.m/s+10 kg.m/s=2.5 kg.m/s

The total momentum of the two 2.5 kg balls moving in opposite directions is 2.5 kg×m/s, calculated by using the principle of conservation of momentum.

The question you're asking involves the conservation of momentum in physics. Momentum is defined as the product of the mass and velocity of an object. In a closed system where no external forces are involved, the total momentum of the objects before the event (collision, separation, etc.) is equal to the total momentum after the event.

In this case, two 2.5 kg balls are moving in opposite directions, one at 3 m/s and the other at 4 m/s. You can calculate the total momentum by adding together the momentum of each ball, taking into account their respective directions.

To find the magnitude of the total momentum of the system, you can use the formula: Total Momentum = Mass Ball 1 × Velocity Ball 1 (direction1) + Mass Ball 2 × Velocity Ball 2 (direction2). Since one ball is moving to the right and the other is moving to the left, we treat these directions as positive and negative respectively.

Therefore, the total momentum is: (2.5 kg × 3 m/s) - (2.5 kg × 4 m/s) = 7.5 kg×m/s - 10 kg×m/s = -2.5 kg × m/s. But, you're asking for the magnitude, so we take it as positive, which is 2.5 kg × m/s.

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Answer:

C. Adding some of the unknown liquid to red litmus paper.

Explanation:

Since the student doesn't know what the liquid is, it is not safe to experiment with it by boiling, cooling, or adding water to it. The safest option would be to add a small bit of the liquid to the litmus paper, which will identify the liquid as neutral, basic, or acidic.

The answer is C. Adding some of the unknown liquid to red litmus paper.

Answer:

D) All of those

Explanation:

You can use "LOWER Near water" to remember that factors which affect the weather patterns of a region.

Latitude. It tends to be hotter when closer to the equator.

Ocean currents. The temperature of the ocean can come from far away and affect the temperature of the air in a new location.

Wind and air mass. Air masses, blown by the wind, change the weather in an area depending on where it was formed.

Elevation, which is the same as altitude. It tends to be colder higher up.

Relief. When mountains block wind and precipitation on one side, making the other side have "relief" on the leeward side.

Near water. Temperature is more moderate because water does not change temperature as fast.

Answer:

Genetic engineering because the genes of the plants were modified.

Explanation:

We can eliminate the second and fourth ones right off of the bat because artificial selection is breeding organisms until they display a trait or a series of traits that is desired, but in this situation, the scientist directly altered the DNA. Genetic engineering, just like all other technologies, aren't necessarily helpful to society all of the time; they always have their draw backs. The answer has to be the third one because the DNA is directly altered, just like the answer choice says.

Question: when Mr. Peterson first met his teenage granddaughter, he thought she was self-centered and silly. after spending more time with her, however, he now thinks she is a great person. this is an example of:

A. fundamental attribution error

B. Mere exposure effect

C. Cognitive dissonance

D. Scapegoat theory

Answer:

when Mr. Peterson first met his teenage granddaughter, he thought she was self-centered and silly. after spending more time with her, however, he now thinks she is a great person. this is an example of:  Mere exposure effect

Explanation:

The mere exposure effect is something on first exposure you dislike it, but after being spending more time with it you will start liking it. Moreover spending time with something or someone getting aware of that person make you believe that you have started liking it, despite the initial aversion. It is psychological phenomenon which with time build up a preference for the thing after getting familiar to them. Also, called as familiarity principle.

Answer: mere exposure effect

Explanation:

Answer:

F, F, f (if I'm understanding the question correctly)

Explanation:

Phenotypes are the physical trait shown. In FF, Ff, ff a capital letter means that the gene is dominant and therefore always shows when paired with either another of itself or a recessive (lowercase). So, for FF, you see F as the phenotype shown, and for Ff, you see F as the phenotype because F is dominant over the recessive f. In ff, however, since you have two recessives, only then can you see f as the phenotype because you have no dominant traits.

To solve the problem, we use the equations of projectile motion. The cannonball takes approximately 4.28 seconds to hit the ground and has a velocity of 50m/s at impact.

To solve this problem, we can use the equations of projectile motion. Since the cannonball is fired horizontally, its initial vertical velocity is zero, so it will only accelerate vertically due to gravity. We can use the equation h = (1/2)gt^2, where h is the height of the cliff (90m), g is the acceleration due to gravity (9.8m/s^2), and t is the time it takes for the cannonball to hit the ground.

Plugging in the values, we get 90 = (1/2)*(9.8)*t^2. Solving for t, we find that it takes approximately 4.28 seconds for the cannonball to strike the ground.

Since the cannonball is fired horizontally, its initial vertical velocity is zero, so its velocity just before hitting the ground will be equal to its horizontal velocity. The horizontal velocity remains constant throughout the motion, so the cannonball will have a velocity of 50m/s just before hitting the ground.

Answer:

D

Explanation:

The relationship between velocity, frequency and wavelength is given by v=fλ

The ocean wave approach the shore at a constant frequency

From the relationship a decrease in velocity will also decrease the wavelength and vice versa.

Answer:

When the solar particles enters into the magnetosphere gets deflected.

Explanation:

When particles enter into the magnetosphere gets deflected because of the solar wind. After getting deflected they comes towards the earth's magnetic field. The Earth's outer space is live and also much dynamic. When solar wind as well as the plasma comes together in magnetosphere, electricity gets generated and also formation of electric field. The magnetosphere found to attract the charged particles only that are being emitted by the sun.

Answer:

2.933 kg m/s

Explanation:

impulse = change in momentum

impulse = mass ( final velocity - initial velocity )

              = 0.0459 ( 63.9 - 0 )

               = 0.0459 × 63.9

                = 2.93301 kg m/s

or              = 2.933 kg m/s up to 4 significant figures

The impulse given to the golf ball is [tex]2.9331 kgm/s[/tex].

calculated as the change in momentum from rest to [tex]63.9 m/s[/tex] using the golf ball's mass.

To determine the impulse given to the golf ball, we need to use the formula:

[tex]Impulse (J) = Change in Momentum (Δp)[/tex]

First, we calculate the initial momentum:

[tex]Initial momentum (pinitial) = mass (m) * initial velocity (vinitial)[/tex]
Since the golf ball is at rest initially, initial velocity [tex](vinitial) = 0 m/s:[/tex]

[tex]pinitial = 0.0459 kg * 0 m/s = 0 kgm/s[/tex]

Next, we calculate the final momentum:

Final momentum [tex](pfinal) = mass (m) * final velocity (vfinal)[/tex]
[tex]vfinal = 63.9 m/s:[/tex]

[tex]pfinal = 0.0459 kg * 63.9 m/s = 2.9331 kgm/s[/tex]

Now, we find the impulse by calculating the change in momentum:

[tex]Impulse (J) = Δp = pfinal - pinitial[/tex]
Impulse (J) = [tex]2.9331 kgm/s - 0 kgm/s = 2.9331 kgm/s[/tex]

Thus, the impulse given to the ball is [tex]2.9331 kgm/s.[/tex]

Answer: Forming

Explanation: Metal forming is a process where materials are subjected to plastic deformation to obtain the required size, shape, and/or change the physical and chemical properties

Answer:

[tex]\displaystyle \frac{Kg\ m^2}{s^3}[/tex]

Explanation:

Physic Units

Physic magnitudes are expressed in international units in different systems. The most used by this modern times is the SI (International System of Units) which expressed length in meters, time in seconds and mass in kg, just to mention some of the most-used magnitudes.

The given expression is a composition of basic units:

[tex]\displaystyle \frac{Kg\ m\ s^{-1}}{m}(m\ s^{-1})^2[/tex]

Converting negative in positive powers:

[tex]\displaystyle \frac{Kg\ m\ }{m\ s}\left ( \frac{m}{s} \right )^2[/tex]

Expanding the square

[tex]\displaystyle \frac{Kg\ m\ }{m\ s}\left ( \frac{m^2}{s^2} \right )[/tex]

Simplifying by m and multiplying like factors

[tex]\displaystyle \frac{Kg\ m^2}{s^3}[/tex]

Answer:The principle is that the slope of the line on a position-time graph reveals useful information about the velocity of the object. ... If the velocity is constant, then the slope is constant (i.e., a straight line). If the velocity is changing, then the slope is changing (i.e., a curved line

Explanation:

Answer:

For 5 s the ball will remain in air.

Explanation:

Given:

Displacement of the ball is equal to height of cliff, [tex]S=120\ m[/tex]

Acceleration of the ball is acceleration due to gravity, [tex]a=g=9.8\ m/s^2[/tex]

Assuming the ball is dropped from the top.

Hence, initial velocity of the ball is, [tex]u=0\ m/s[/tex]

Let 't' be the time the ball takes to reach the base of cliff.

Now, we have to use the Newton's equations of motion that relates displacement, initial velocity, acceleration and time.

So, we use the following equation of motion:

[tex]S=ut+\frac{1}{2}at^2[/tex]

Plug in the given values and solve for 't'. This gives,

[tex]120=0+\frac{1}{2}(9.8)t^2\\120=4.9t^2\\\frac{120}{4.9}=t^2\\t^2\approx25\\t=\sqrt{25}=5\ s[/tex]

Therefore, the time till the ball is in air is approximately 5 s.