A substance has a half-life of 10,000 years and an initial mass of 1,000 grams. How many years will pass before only 250 grams of the substance's parent material is left?

A. 20,000
B.25,000
C. 30,000
D.40,000

Answer

4.8 N

If the box is moving with a constant velocity, then we can say that the system is in equilibrium. This is because if the external force (F->) was greater than other forces the box would be accelerating. This tells us that this force (F->) is just enough to overcome friction and so it must be equal to 4.8 N.

The normal force has no effect to the horizontal velocities or forces. It is equal to -Weight. That is -74 N. The negative sign shows that the force is in opposite direction.

An electrically charged element is called an "ion". A neutral element is an atom.

Answer:

0.25 kg

Explanation:

Newton's second law states that:

[tex]F=ma[/tex]

where

F is the net force acting on an object

m is the object's mass

a is its acceleration

In this problem, we have:

[tex]F=0.5 N[/tex] is the force exerted on the object

m is the ball's mass

[tex]a=2.0 m/s^2[/tex] is its acceleration

Solving the formula for m, we can find the ball's mass:

[tex]m=\frac{F}{a}=\frac{0.5 N}{2.0 m/s^2}=0.25 kg[/tex]

To protect a material from the influence of an external magnetic field, the material should be kept in soft iron ring.

So the correct answer is A.

Hope this helps,

Davinia.

Answer:

0.25 m

Explanation:

The period of a pendulum is given by

[tex]T=2 \pi \sqrt{\frac{L}{g}}[/tex]

where  in this case

T = 1.0 s is the period of the pendulum

g = 9.81 m/s^2 is the acceleration due to gravity

L is the length of the pendulum

Re-arranging the equation and solivng for L, we find the length of the pendulum:

[tex]L=g (\frac{T}{2 \pi})^2=(9.81 m/s^2)(\frac{1.0 s}{2\pi})^2=0.25 m[/tex]

Answer:

.248490m

Explanation:

Using the equation:

T=Time

L=Length

g=Gravitational Force≈9.81

T= [tex]2\pi \sqrt{L/g}[/tex] or easier written to find the length using time: [tex]L=\frac{T^{2} *g}{4\pi^{2} }[/tex]

so simply plugging in 1 for T we get [tex]\frac{9.81}{4\pi^{2} } \\[/tex]≈.25m

➷ A dry cell changes chemical energy into electrical energy.

➶ Hope This Helps You!

➶ Good Luck (:

➶ Have A Great Day ^-^

↬ ʜᴀɴɴᴀʜ ♡

A dry cell converts chemical energy into electrical energy through redox reactions, during which the bonds of reactants are broken and new bonds are formed in the products, releasing energy that is harnessed as electrical current.

A dry cell changes chemical energy into electrical energy. This process is an example of an energy transformation where the energy stored within the chemical compounds of the dry cell is converted into an electrical current that can be used to power electrical devices. The construction of a dry cell battery includes chemical reactions which facilitate this change, and these reactions are described as spontaneous redox reactions where oxidation occurs at the anode and reduction at the cathode.

During this energy transformation, the potential energy stored within the chemical bonds of the reactants is being altered as the bonds are broken and new ones are formed in the products. It is this change in bond energy that is harnessed as electrical energy. However, it's worth noting that dry cells are considered primary batteries, meaning they are single-use and cannot be recharged due to their construction and the nature of the reactions involved.

Wave interference is the phenomenon that occurs when two waves meet while traveling along the same medium. The interference of waves causes the medium to take on a shape that results from the net effect of the two individualwaves upon the particles of the medium.Hope this help!

wave interference is the phenomenon that occers when two waves meet while traveling along the same medium. The interference of waves causes the medium to take shape that results that the net effect of the two individual waves upon the particals of the medium.

Answer:

B. A virtual image that is larger than the object

Explanation:

The magnification of a lens is given by

[tex]m=\frac{h_i}{h_o}=-\frac{d_i}{d_o}[/tex] (1)

where

[tex]h_i[/tex] is the size of the image

[tex]h_o[/tex] is the size of the object

[tex]d_i[/tex] is the distance of the image from the lens

[tex]d_o[/tex] is the distance of the object from the lens

Some considerations:

[tex]h_o, d_o[/tex] are always taken as positive

if [tex]h_i > h_o[/tex], the image is larger than the object, otherwise it is smaller

if [tex]d_i > 0[/tex], the image is real, otherwise it is virtual

In this situation, we have M = 3.0 (positive number and larger than 1). Looking at eq.(1), this implies:

1) [tex]h_i > h_o[/tex] --> image is larger than the object

2) [tex]d_i < 0[/tex] --> the image is virtual

So, the correct choice is

B. A virtual image that is larger than the object

Answer:

B. A virtual image that is larger than the object

Explanation:

Quiz verified

its d: mass increase

Answer:

The answer is formation of a solid and release of heat (APEX)

Explanation:

The specific heat capacities of different metals determine the amount of heat required to raise their temperature by 1K. The metals provided have the following heat capacities.

Aluminium-921

Brass-401

copper-376

Platinum-125

The higher the heat capacity, the more the energy required to raise the temperature. Therefore, aluminium has the least temperature increase.

Answer: A) Aluminum

Explanation:

If you are in USA TEST PREP!!!

Here is your answer

[tex]<b>5 watts</b>[/tex]

REASON :

Given,

t= 20 secs

F= 20 N

s (displacement)= 5m

Now,

Power= \frac{Work done}{time}

P= W/t ...... (i)

W= F×s×cos(theta)

W= 20×5 × 1 (theta is 0 degree; so cos0= 1)

W= 100 J

Hence,

P= 100/20 (from eq. i)

P= 5 watts

HOPE IT IS USEFUL

4.1: Temperature is not the same as heat. Heat is energy in transfer. ... Conduction is the transfer of thermal energy (heat in transfer) due to collisions between the molecules in the object. Collisions between adjacent atoms and molecules transfer kinetic energy from the warmer to the cooler object.

Answer:

Heat

Explanation:

Temperature is measurement of how hot or cold an object is. The net energy of a body is known as thermal energy. Energy in the form of Heat is transferred from one body to another because of difference in temperature. It is basically the transfer of thermal energy. The heat transfer takes place via conduction, convection or radiation.

Kinetic energy = (1/2) (mass) (speed)²

KE = (1/2) (1 kg) (30 m/s)²

KE = (1/2) (1 kg) (900 m²/s²)

KE = 450 kg-m²/s²

KE = 450 Joules

That's at the instant it leaves the thrower's hand.  After that, gravity immediately begins to rob its kinetic energy, so the KE starts decreasing right away.

The kinetic energy of a 1-kilogram ball thrown into the air with an initial velocity of 30 m/sec is 450 J.

The kinetic energy of an object is given by the formula KE = 1/2 mv[tex]^[/tex], where m is the mass of the object and v is its velocity.

In this case, the mass of the ball is 1 kilogram and the initial velocity is 30 m/sec.

Plugging these values into the formula, we get KE = 1/2 * 1 kg * (30 m/sec)[tex]^[/tex] = 450 J.

It's determined by the turns ratio. (A)

A.) Turns Ratio  is the answer

During phase changes, energy changes are usually involved. For example, when solid dry ice vaporizes (physical change), carbon dioxide molecules absorb energy. Meanwhile, when liquid water becomes ice energy is released.

hope this helps :)

Energy can be converted from one form to another according to the law of conservation of energy. In physical changes, energy changes the state of a substance without altering its structure, whereas in chemical changes, it involves in forming and breaking bonds, releasing stored energy. These conversions are commonplace in everyday activities, including energy production from food and fuel.

Energy plays a vital role in both physical and chemical changes according to the law of conservation of energy, which states that energy can be neither created nor destroyed, only changed in form. In physical changes, energy is involved in changing the state of a substance without altering its chemical structure, such as melting ice into water. On the other hand, chemical changes involve the breaking and forming of chemical bonds with energy investment, releasing potential energy stored in molecules.

In everyday situations, energy involved in chemical changes significantly impacts our lives. For example, the macronutrients in food (proteins, fats, and carbohydrates) undergo metabolic reactions providing us with the energy we need. Similarly, fuels like gasoline, natural gas, and coal undergo combustion reactions to produce energy for different activities like transportation and heating.

The conversion of chemical energy into other forms of energy can be seen in many familiar instances, such as batteries in a cell phone or a car where chemical reactions produce electrical energy.

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Potential energy=mass*acceleration due to gravity*height

= 8 000 000 * 9.8 * 50

= 3.92 * 10^9

The change in the potential energy of the Niagara falls is - 3.92 x 10⁹ J.

The given parameters;

The change in the potential energy of the waterfall is calculated as follows;

ΔP.E = mgh₂ - mgh₁

ΔP.E = mg(h₂ - h₁)

where;

ΔP.E = 8 x 10⁶ x 9.8(0 - 50)

ΔP.E = - 3.92 x 10⁹ J

Thus, the change in the potential energy of the Niagara falls is - 3.92 x 10⁹ J.

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Answer:

87.5 m/s

Explanation:

The speed of a wave is given by

[tex]v=\lambda f[/tex]

where

v is the wave speed

[tex]\lambda[/tex] is the wavelength

f is the frequency

In this problem, we have

[tex]f=250 Hz[/tex] is the frequency

[tex]\lambda=0.35 m[/tex] is the wavelength

Substituting into the equation, we find

[tex]v=(0.35 m)(250 Hz)=87.5 m/s[/tex]

The answer Is C i hope this is helpfull

Fluorescence occurs when a substance emits light after absorbing light or other electromagnetic radiation of a different wavelength. Thus, the correct option is C.

Electromagnetic radiation may be defined as a type of radiation that includes all possible kinds of radiation such as X-rays, gamma rays, radio waves, etc that consists of varied electric as well as the magnetic field.

Fluorescence may be defined as the process of emission of light by a specific substance that has initially absorbed light through the means of electromagnetic radiations. It is also known as luminescence.

The light that has been emitted by substances may be of a longer wavelength or shorter wavelength depending on the frequency of that radiation.

Therefore, Fluorescence occurs when a substance emits light after absorbing light or other electromagnetic radiation of a different wavelength. Thus, the correct option is C.

To learn more about Fluorescence, refer to the link:

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Period is the time taken for one complete oscillation in a harmonic motion.

Five oscillations take 13.5s

Period= total time for the n vibrations÷ the n vibrations.

Then one oscillation will take 13.5s÷5=2.7s

Therefore the period of the this motion is 2.7s

Shiny surface are poor radiators of heat

A shiny , silver and smooth surface reduce the heat loss of a hot object to its cooler surroundings​ because good radiators and good absorbed of heat have dull, black and rough surfaces while on the other hand poor radiators have smooth and shiny surfaces therefore they reduce the heat loss of a hot object.

The answer is: The acceleration of the object B is half of the object A.

We can solve this problem applying the Newton's Second Law, which states that the product of the mass and the acceleration of a body is equal to the force applied to that body.

[tex]F=ma[/tex]

So,

For the object A, we have:

[tex]F=15N\\m=25Kg[/tex]

Calculating the acceleration we have:

[tex]a=\frac{F}{m}=\frac{15\frac{kg.m}{s^{2}}}{25Kg}=0.6\frac{m}{s^{2} }[/tex][/tex]

For the object B, we have:

[tex]F=15N\\m=50Kg[/tex]

Calculating the acceleration we have:

[tex]a=\frac{F}{m}=\frac{15\frac{kg.m}{s^{2}}}{50Kg}=0.3\frac{m}{s^{2} }[/tex][/tex]

Hence,

[tex]ObjectA=0.6\frac{m}{s^{2}}\\\\ObjectB=0.3\frac{m}{s^{2}}[/tex]

So, what is true about the acceleration of object A and object B?

The answer is that the acceleration of the object B is half of the object A acceleration since the mass of the object B is two times the mass of the object A.

Have a nice day!

The acceleration of Object A will be greater than the acceleration of Object B, as Object A has half the mass of Object B but both are subjected to the same force.

The question pertains to the basic principles of Newton's Second Law of Motion, which states that the force acting on an object is equal to the mass of that object multiplied by its acceleration (F = ma). For Object A with a mass of 25 kilograms and Object B with a mass of 50 kilograms, both subjected to the same force of 15 newtons, we can determine that Object A will have a greater acceleration than Object B.

To find the acceleration for each object, divide the force by the mass of each object. For Object A: acceleration = 15 N / 25 kg = 0.6 m/s². For Object B: acceleration = 15 N / 50 kg = 0.3 m/s².

Hence, the acceleration of Object A is twice that of Object B, because Object B has twice the mass of Object A and since they are both subjected to the same force.

Hello! The function of the Pinna is to be a kind of funnel that assists in directing sound further into the ear. Without this funnel the sound waves would take more direct routes to the auditory canal. This would be difficult and wasteful as much of the sound would be lost making it harder to understand the sounds.  Hope this helps!

The pinna plays a crucial role in the auditory system by aiding in sound collection, localization, amplification, and protection of the more sensitive parts of the ear.

The function of the pinna, which is the external part of the ear, is to collect sound waves and funnel them into the ear canal towards the eardrum. Additionally, the pinna helps in localizing the source of a sound by providing directional cues, which are particularly important for vertical localization (determining if a sound is coming from above or below). The unique shape of the pinna also aids in amplifying certain frequencies, which can enhance the perception of sound.

To understand the role of the pinna in sound localization, consider the following:

 1. Sound Collection: The cupped shape of the pinna collects sound waves and directs them into the ear canal. This increases the sound pressure at the eardrum, which is beneficial for hearing faint sounds.

 2. Directional Cues: The pinna's shape causes different frequencies to be reflected or absorbed in a way that depends on the angle of incidence of the sound wave. This creates a unique frequency signature for sounds coming from different directions, especially in the vertical plane.

 3. Amplification: The pinna can amplify certain frequencies, particularly those in the range of human speech, making it easier to hear and understand conversations in noisy environments.

 4. Protection: The pinna also serves to protect the more delicate structures of the middle and inner ear from mechanical damage and foreign objects.

Final answer:

Ground-based radio telescopes can collect data during both day and night and in all weather conditions (B). They are not affected by daylight or clouds as their observations are based on radio waves which can penetrate atmospheric barriers.

Explanation:

The correct answer to the student's question about when ground-based radio telescopes can collect data from distant objects in space is B. during the day or night and in any weather conditions. Unlike optical telescopes, radio telescopes are not limited by the presence of sunlight or the visibility conditions provided by the Earth's atmosphere. Radio waves can penetrate clouds, and because the Sun is not particularly bright at many radio wavelengths, radio telescopes can operate effectively during both daytime and nighttime. This capability greatly enhances the flexibility of radio astronomy compared to traditional optical astronomy, which can be susceptible to factors such as light pollution and weather conditions.

In contrast to optical observations that often require dry, dark skies and suffer from issues such as light scattering and 'bad seeing' due to atmospheric turbulence, radio telescopes can obtain high-resolution data with technologies like interferometers and very long baseline interferometry. For instance, the Very Long Array (VLA) and the Atacama Large Millimeter/submillimeter Array (ALMA) show the potential of these instruments in capturing precise cosmic phenomena. Moreover, radio astronomy has pushed the boundaries for ground-based observations, with advancements such as radar astronomy that involves both transmitting and receiving signals, enabling studies of celestial bodies within our solar system.

Final answer:

Ground-based radio telescopes can collect data during both the day and night and are not significantly affected by weather conditions. The correct answer is option (B).

Explanation:

Ground-based radio telescopes can collect data from distant objects in space during the day or night and in any weather conditions. Unlike optical telescopes that are impacted by weather and light conditions, radio telescopes are less affected because they collect and focus radio waves.

Weather conditions, such as clouds, or the presence of sunlight do not significantly hinder the operation of radio telescopes, making option B the correct answer: during the day or night and in any weather conditions.

Answer

Greater than.

Static friction is the force that opposes motion between two objects that are not in motion. For the object to move one have to overcome the static friction. This force is usually greater than the force that exist between two surfaces that are in relative motion. This force is called kinetic friction.

For this reason the coefficient of static friction is greater that coefficient of kinetic friction.

Answer:

1.quanti

2. quanti

3.quali

4.quanti

5.quanti

6.quali

7.Quali

8?Quanti

9.Quali

10.Quanti

'Dispersion of Light' can be defined as the splitting of white light when it passes through a glass prism into its constituent spectrum of colors (i.e. violet, indigo, blue, green, yellow, orange and red).

Light can be split into seven wavelengths when the light is passed through a prism or scatterd by air molecules in the atmosphere.

The term diffraction has to do with the splittiing of light into several wavelengths. This is often achieved by passing the light through a prism which splits it into seven wavelengths.

Hence, light can be split into seven wavelengths when the light is passed through a prism or scatterd by air molecules in the atmosphere.

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Answer:

= 500 Hz

Explanation:

A Period of a wave is the time taken for one complete oscillations by the wave particles. It is measured in seconds.

Frequency on the other hand is the number of complete oscillations covered by a wave in one second. It is measured in Hertz.

Period is the inverse of frequency.

That is; Period, T = 1/ frequency, f

T = 1/f and thus; f = 1/T

Therefore;

f = 1/0.002 seconds

 = 500 Hz

The frequency of a sound wave with a period of 0.002 seconds is 500 Hz. The provided speed of sound is useful for calculating the wavelength of the sound wave when combined with the frequency.

The frequency of a sound wave is given by the inverse of the period. Since the period of the sound wave is 0.002 seconds, to find the frequency, you would use the formula:

Frequency (f) = 1 / Period (T)

Frequency (f) = 1 / 0.002 seconds = 500 Hz

The speed of sound at room temperature, which is approximately 344 m/s, is not directly needed to calculate the frequency from the period. However, this information can be used to find the wavelength of the sound wave using the relationship:

Speed (v) = Frequency (f) × Wavelength (λ)

In this case, if you wanted to find out the wavelength of a sound with a frequency of 500 Hz, it would involve rearranging the formula to solve for the wavelength.

In polar covalent bonding, electrons are shared unequally between atoms, due to the unequal distribution of electrons between atoms of different elements, slightly positive and slightly negative charges appear in different parts of the molecule.

In this context, water molecule is an exellent example of this type of bonding:

Water ([tex]H_{2}O[/tex]) can stick to itself through hydrogen bonds, because a water molecule consists of 2 hydrogen atoms attached to 1 oxygen atom.  

The oxygen atom tends to monopolize more electrons and keeps them away from hydrogen. Then, it can be said that a water molecule will have a negative side (oxygen) and a positive side (hydrogen).  

Thanks to this polarity, water molecules can stick together with the formation of hydrogen bonds to attract a partial positive charge of hydrogen and a more electronegative atom, such as oxygen.

that isn't a question, and it makes no sense