What does the expression “75 meters per second southeast” best describe?

Explanation:

there are 8 groups of the periodic table

group number one is of the alkali metals

group number two use of the alkaline Earth metals

group number three is known as group (III)

group number for is known as group IV

group number V is known as group V group number six is known as group VI

group number seven is known as halogens

and group number eight is of the noble gases

the periodic table does not have 18 groups as the elements between group III and group IV all known as the transition metals.

Answer: A. 1.0

Explanation:

The kinetic energy of the ball is 21.6 joules, the negative sign indicates that the kinetic energy is decreasing, which means that work must be done on the ball to stop it. So, the amount of work required to stop the ball is 21.6 joules.

(a) To find the kinetic energy of the ball, we can use the formula KE = 1/2mv^2, where KE is the kinetic energy, m is the mass of the ball, and v is the velocity of the ball.

Plugging in the given values, we get:

KE = 1/2(0.3 kg)(12 m/s)^2 = 21.6 J

Therefore, the kinetic energy of the ball is 21.6 joules.

(b) To find how much work would be required to stop the ball, we need to use the work-energy principle, which states that the work done on an object is equal to the change in its kinetic energy. In this case, we want to bring the ball to a complete stop, so its final velocity will be 0 m/s.

Using the same formula as before, we can find the initial kinetic energy of the ball:

KE = 1/2mv^2 = 1/2(0.3 kg)(12 m/s)^2 = 21.6 J

Since the final velocity is 0 m/s, the final kinetic energy will be 0 J. Therefore, the change in kinetic energy is:

ΔKE = KEfinal - KEinitial = 0 J - 21.6 J = -21.6 J

The negative sign indicates that the kinetic energy is decreasing, which means that work must be done on the ball to stop it.

Therefore, the amount of work required to stop the ball is 21.6 joules.

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To solve a line cut by a transversal, use the properties of parallel lines, such as corresponding angles and alternate interior angles, to find the unknown angle measurements.

When a line is cut by a transversal, a number of simultaneous equations can be formed by using the properties of parallel lines. For example, the corresponding angles of the lines will always be equal, the alternate interior angles will be equal, and the consecutive interior angles will add up to 180 degrees. Using these properties, you can identify the unknown angle measurements. For example, if the measure of one of the corresponding angles is known, the measure of the other corresponding angle can be determined simply by using the fact that they are equal. Similarly, if one of the alternate interior angles is known, the other can be determined using the fact that they are equal. By forming these equations, you can solve for the unknown angle measurements.

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Answer:

Solar panels have increased in efficiency over the past 20 years

Explanation:

Because if efficiency have increased other technologies will be discovered

Answer:

Solar panels have increased in efficiency over the past 20 years

Explanation:

A force of 15 Newton stretches a spring to a total length of 30 cm and an additional force of 10 Newton's stretches to a Spring of 5 cm, the natural length of the spring is 58.5 cm

To find the natural length of the spring, we can use Hooke's law, which states that the force applied to a spring is directly proportional to the displacement of the spring from its natural length.

Let's denote the natural length of the spring as L.

According to the problem, a force of 15 Newton stretches the spring to a total length of 30 cm. This means that the displacement of the spring is 30 cm - L.

Using Hooke's law, we can set up the following equation:

Force = k * Displacement

where k is the spring constant.

For the first scenario, we have:
15 N = k * (30 cm - L)

Next, we are given that an additional force of 10 Newton's stretches the spring to a length of 5 cm. This implies that the displacement of the spring is 5 cm - L.

Using Hooke's law again, we can set up the following equation:

10 N = k * (5 cm - L)

Now we have two equations:

15 N = k * (30 cm - L)
10 N = k * (5 cm - L)

We can solve this system of equations to find the value of L, the natural length of the spring.

By dividing the second equation by 10, we get:

1 N = k * (0.5 cm - 0.1L)

Rearranging the equation, we have:

1 N = 0.5 k - 0.1kL

Now, let's substitute the value of k from the first equation into this equation:

1 N = 0.5 (15 N / (30 cm - L)) - 0.1 (15 N / (30 cm - L)) * L

Simplifying the equation, we get:

1 = 0.75 / (30 cm - L) - 1.5L / (30 cm - L)

Combining the terms on the right side of the equation, we have:

1 = (0.75 - 1.5L) / (30 cm - L)

Cross-multiplying, we get:

30 cm - L = 0.75 - 1.5L

Simplifying the equation, we have:

L - 1.5L = 0.75 - 30 cm

Combining like terms, we get:

-0.5L = -29.25 cm

Dividing both sides of the equation by -0.5, we get:

L = 58.5 cm

Therefore, the natural length of the spring is 58.5 cm.

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A rogue planet or planetary mass object is a celestial body that is not gravitationally bound to any particular star and does not orbit around it.

These objects can either be ejected from their original star system or may have formed independently. Due to their lack of a central star, rogue planets can be difficult to detect and are often discovered through their gravitational effects on other nearby objects. Despite their isolated existence, these rogue planets can still have their own moons and even support life, depending on factors such as their size, composition, and distance from any potential heat source.
A rogue planet, also known as a planetary-mass object, is a celestial body that does not orbit around any particular star. These objects have masses similar to planets but are not gravitationally bound to a star, thus making them "rogue" in nature as they freely move through space.

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The marked part x is inside the circle hence, the direction will be same in all points. Therefore, the correct label is x includes a magnitude.

There are two types of physical quantities namely, scalar and vector quantities. Scalar quantities or variables are those which are having magnitude only and not depends upon the direction.

Temperature, volume, refractive index, energy  etc. are scalar quantities. Vector quantities are those having both magnitude and direction. Force, acceleration, velocity, work done etc. are vector quantities which depends on the direction.

The marked area x is a point inside a circle. Therefore its path of motion or change is circular and thus does not affects its magnitude. Thus it have no directional change and has a magnitude.

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Answer: Microscope is an instrument that is used for observing micro particles, cells, and nanosized particles.

Explanation:

Placing one hand below the stage of the microscope and other hand must be used to hold the arm of the microscope. This facilitates the safety of the microscope as it will provide support to the entire structure of the microscope and also to the lens and mirrors attached to the structure of the microscope. If any of the part get damaged or lost during carrying it will affect the overall functioning of the microscope.

Answer:

wrapping the electrical cord around the arm of the microscope

Explanation:

just took the test

The 3 types of electromagnetic waves are

Radio Waves

Infrared Waves

Ultraviolet (UV) Waves

A magnetic field and an electric field vibrate together to produce electromagnetic waves, also known as EM waves. In other words, magnetic and electric fields that are oscillating make up electromagnetic waves (EM).

And we call these waves "electromagnetic" because they have magnetic fields in addition to electric fields. We also call them "waves" because they propagate outward in accordance with wave equations, just like all the other waves we've seen.

Transverse motion characterises electromagnetic waves. Magnetic and electric fields that are perpendicular to each other oscillate to form electromagnetic waves. The speed of electromagnetic waves through vacuum is the same, 3 x 10^8 m/s.

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Jupiter and Neptune are both gas giants, meaning they have a thick atmosphere composed mainly of hydrogen and helium.

What is Planet?

A planet is a celestial body that orbits a star, is roughly spherical in shape, and has cleared its orbit of other debris. In our solar system, there are eight planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. These planets vary in size, composition, and other characteristics.

They also have strong winds and storms, and both have a system of rings and numerous moons. In terms of size, Jupiter is the largest planet in our solar system, while Neptune is the fourth largest.

Mercury and Venus are rocky planets, similar in composition to Earth. Mercury is the smallest planet in our solar system, while Venus is similar in size to Earth but has a very thick and hot atmosphere.

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Angular acceleration refers to the rate at which an object's angular velocity changes over time. It is a measure of how quickly an object's rotation is speeding up or slowing down. To find the angular acceleration, you will need to use the formula: angular acceleration = change in angular velocity / change in time.

To begin, you will need to have two sets of data: the initial angular velocity of the object and the final angular velocity of the object, as well as the time it took for the object to change from the initial velocity to the final velocity. Once you have this data, you can use the formula to calculate the angular acceleration.

For example, let's say an object starts with an angular velocity of 2 radians per second and after 5 seconds it has an angular velocity of 4 radians per second. To find the angular acceleration, you would use the formula: angular acceleration = (4 radians/second - 2 radians/second) / 5 seconds = 0.4 radians/second^2.

It's also important to note that the angular acceleration is a vector quantity and it has the same direction as the net torque applied on the body.

In summary, finding the angular acceleration is done by taking the change in angular velocity and dividing it by the change in time. By using this formula and having the necessary data, you can easily calculate the angular acceleration of an object.

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Answer:

Point number 3.

Explanation:

Volcanism can be studied to found out evidence of the internal structure of the Earth.

Answer:

Volcanism

Explanation:

Comparing the two plans, the interval use plan costs $142.25 per month, while the standard use plan costs $153 per month. Therefore, the interval use plan is cheaper for Isaiah's electricity consumption.

To compare the monthly costs of the interval use plan and the standard use plan for Isaiah's electricity consumption, we need to consider the rates for on-peak and off-peak usage.
For the interval use plan, we have 575 kWh on-peak and the rest off-peak. Let's assume the on-peak rate is $0.15 per kWh and the off-peak rate is $0.08 per kWh. To calculate the cost of on-peak usage, we multiply the on-peak rate by the on-peak usage: 575 kWh * $0.15/kWh = $86.25. For the off-peak usage, we multiply the off-peak rate by the off-peak usage: (1,275 kWh - 575 kWh) * $0.08/kWh = $56.
Therefore, the total monthly cost for the interval use plan is $86.25 + $56 = $142.25.
Now let's calculate the monthly cost for the standard use plan. Assuming the rate for the standard use plan is $0.12 per kWh, we multiply this rate by the total usage: 1,275 kWh * $0.12/kWh = $153.
Comparing the two plans, the interval use plan costs $142.25 per month, while the standard use plan costs $153 per month. Therefore, the interval use plan is cheaper for Isaiah's electricity consumption.

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Answer:

If the body temperature falls below this temperature then enzymes will work too slowly for body process to occur fast enough the keep the mammal alive.

Explanation:

The speed at which the other car is travelling is 27.71 m/s.

The speed of the second car is calculated as follows;

f₂ = f₁(v + v₁)/(v - v₂)

where;

600 = 512(345 + 26.8) / (345 - v₂)

600/512 = (345 + 26.8) / (345 - v₂)

1.1718 = 371.8/(345 - v₂)

345 - v₂ = 371.8/1.1718

345 - v₂ = 317.289

v₂ = 345 - 317.289

v₂ = 27.71 m/s

Thus, the speed at which the other car is travelling is 27.71 m/s.

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Answer:

1) D

2) C

3) E

4) A

5) B

Explanation:

Hope this help!

Answer:

Note that:

Particles in a:

gas are well separated with no regular arrangement.

liquid are close together with no regular arrangement.

solid are tightly packed, usually in a regular pattern.

Explanation:

Answer:

A coil having 45 loops

Explanation:

The strength of an electromagnet is proportional to the number of loops. So, when we have more loops, we will get mor strength. It means that the coil that will produce a magnetic field with the maximum strenght is a coil having 45 loops because 45 is the greatest number in the list.

a) The free body diagram (FBD) for the mass would include the force of gravity (Fg) acting downward , the tension force (T) acting at an angle from the vertical, and the centripetal force (Fc) acting toward the center of the circle.

b) the tension on the rope is T = 215.5 N. c) The angle that the rope makes with the vertical is 61.4°. A conic pendulum is a type of pendulum that rotates in a horizontal circle while hanging from a fixed point.

The force that causes the mass to rotate is the tension in the rope. In this case, the mass of the pendulum is 12 kg, the length of the rope is 2.0 m, and the period of rotation is 2.1 s.


The tension on the rope can be found using the equation for centripetal force:

Fc = (m*v^2)/r

Where m is the mass, v is the velocity, and r is the radius of the circle. The velocity can be found using the equation v = 2πr/T, where T is the period of the rotation. Substituting the values given in the question:

v = (2π*2.0)/2.1 = 5.99 m/s

Fc = (12*5.99^2)/2.0 = 215.5 N

The tension force is equal to the centripetal force, so T = 215.5 N.

c) The angle that the rope makes with the vertical can be found using the equation tanθ = Fc/Fg, where Fg is the force of gravity. The force of gravity can be found using the equation Fg = mg, where g is the acceleration due to gravity (9.8 m/s^2):

Fg = (12*9.8) = 117.6 N

tanθ = 215.5/117.6 = 1.83

θ = tan^-1(1.83) = 61.4°

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Answer:

I already know the first one is electromagnetic but I don't know the second one sorry

Explanation:

If you start with 1,000 grams of erbium-165, the time it  will take to have 125 grams of erbium-165 left in the sample is 20.8 hours.

option D is the correct answer.

Half life is the time that it takes for half of the original value of some amount of a radioactive element to decay.

If you start with 1,000 grams of erbium-165, the time it  will take to have 125 grams of erbium-165 left in the sample is calculated as follows;

1,000 ---------- 0 time

500 ----------- 10.4 hours

125 ------------- 20.8 hours

Thus, from the calculation done above, we can see that If you start with 1,000 grams of erbium-165, the time it  will take to have 125 grams of erbium-165 left in the sample is 20.8 hours.

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Answer:

I guess A option is correct

Electromagnetic waves consists of alternate electrical and magnetic fields.

Light is a electromagnetic wave. Hence in light wave, electrical and magnetic fields vibrate.

The battery would have approximately 4.68 x 10^20 electrons flow through it per minute when connected to a 1.20 ohm bulb.

To calculate the number of electrons that flow through the circuit per minute, we need to use the formula:
I = V/R
where I is the current, V is the voltage of the battery, and R is the resistance of the bulb.

In this case, the voltage of the battery is 1.5V, and the resistance of the bulb is 1.20 ohms. Plugging these values into the formula, we get:
I = 1.5V / 1.20 ohms
I = 1.25 amps

Now, we need to convert this current to the amount of electrons that flow through the circuit per minute. To do this, we need to use the formula:
n = I*t/q

where n is the number of electrons, I is the current, t is the time in seconds, and q is the charge of an electron (which is 1.602 x 10^-19 coulombs).

We can convert the time from minutes to seconds by multiplying by 60. So, if we assume that the battery is connected to the circuit for one minute, we can calculate the number of electrons as:
n = 1.25 amps * (60 seconds) / (1.602 x 10^-19 coulombs)
n = 4.68 x 10^20 electrons

Therefore, the battery would have approximately 4.68 x 10^20 electrons flow through it per minute when connected to a 1.20 ohm bulb.

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Answer:

i hope this helps!

Explanation:

Artificial Insemination (AI) is an Assisted Reproductive Technology (ART) used worldwide to deposit stored semen directly into a cow or heifer's uterus. It is a tool for improving reproductive performance and genetic quality of livestock.

source: https://nwdistrict.ifas.ufl.edu/phag/2020/05/29/tips-for-successful-artificial-insemination-of-cattle/

The nucleus of an atom will have a positive charge due to the existence of protons, which are positively charged subatomic particles.

Protons and neutrons are present in an atom's nucleus. We are aware that a proton has a charge of + 1 and a neutron has a charge of 0 (or no charge). As a result, the atom's nucleus will always be positively charged. A nucleus is a name for the dense area in the middle of an atom. Because there are positively charged subatomic particles present, the nucleus usually has a positive charge. The subatomic particles, which are present in atoms but far smaller than atoms, are there. Protons, neutrons, and electrons are the three primary subatomic particles found in matter. An atom's nucleus contains protons and neutrons, while its outermost nucleus contains electrons. Neutrons are subatomic particles with a charge of zero, whereas protons are positively charged.

Therefore, the nucleus of an atom will always have a positive charge. Consequently, an atom's nucleus has a positive charge because of the presence of protons.

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