Sodium-24 has a half-life of 15 hours. after 45 hours, how much sodium-24 will remain of an original 50.0-g sample? 5.56 g 6.25 g 16.7 g 25.0 g

Answers

Answer 1

Answer:

6.25  gm

Explanation:

1 /2  * 1/2 * 1/2 = 1/8th of the original

  50/8 = 6.25 gm

Answer 2

Answer:

its b

Explanation:

trust


Related Questions

What is the angle of incidence if the total angle between the incidence ray and reflected ray is 70⁰​

Answers

Answer:

35°

Explanation:

By laws of reflection,

Angle of incidence = Angle of reflection

Angle between incident ray and reflected ray = 70°

Angle of incidence + Angle of reflection = 70°

Since,

Angle of incidence = Angle of reflection

Angle of incidence + Angle of incidence = 70°

2 Angle of incidence = 70°

Divide 2 on both sides,

Angle of incidence = 70° / 2

Angle of incidence = 35°

The voyager 1 spacecraft is currently 20.7 billion km from earth and heading out of our solar system. how long does it take radio messages from voyager 1 to reach us

Answers

Answer:

20.7 billion = 20.7E9        converting to units of 10

20.7E9 km = 20.7E12 m

t = S /v = 20.7E12 m / 3.0E8 m/s = 6.9E4 s = 69000 s

69000 s = 1150 min = 19.2 hrs

What conclusion can be made about the relationship between the wavelength of light and the angle of refraction?

Answers

From the data in the given table, it can. be concluded that the angle of refraction decreases with increasing wavelength.

What is wavelength of light wave?

The wavelength of a wave is the distance between two successive points on the wave.

The wavelength of a wave is usually measured in metres.

The angle of refraction is the angle to which a wave is bent from the normal.

The color of light that has the shortest wavelength is Red while violet has the longest wavelength.

From the table provided, it can be seen that the angle of refraction decreases with increasing wavelength.

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A proton is to orbit Earth at the equator using Earth's magnetic field to supply part of the necessary centripetal force. In what direction should the proton move

Answers

Answer: west
EXPLANATION:
The direction of is towards down and the centripetal force is towards down. So, the proton must move towards west in order to orbit earth.

atmospheric pressure is measured in all of the following units except ……… ? A. torr B. pascal C. bar D. newton?

Answers

Answer:

C. Bar

Explanation:

what is the density of the acid in a car battery if 200 mL of acid has a mass of 240 g

Answers

Answer:

d = 240 g/200 mL = 1.2 g/mL = 1.2 g/cm3

Explanation:

Huge loops of gas that link different parts of sunspot regions are called.

Answers

Answer:

Prominences

Explanation:

if the north pole of one magnetic is brought near the south pole of another magnet, the poles will

Answers

Answer: Heyo Kenji Here! Here's your answer-If the north pole of a magnet is brought near the south pole of another magnet, they will get attracted towards each other.

Explanation: Hope this helps!

Have a nice day!

- Kenji ^^

Answer:

If the north end of a magnet is brought near the south end of another magnet, they will get attracted towards each other. Remeber oppsites attrcat. The same repeal.

Explanation:

Hope This Helps

Have A Great Day

~Zero~

What planet is named for the roman god of commerce, travel, and thievery?.

Answers

Answer:

The answer would be Mercury.

Explanation:

Due to its fast travel across the sky, the planet has been given this name. Mercury was named for the fast-moving messenger god of Rome. The planets received their names from the ancient Greeks because they believed that the moving stars in their night sky were their gods going about their activity, so... the planets were named after Roman gods.

Hope this helps! :D

When air moves from a region of high pressure to a region of low pressure, with no addition or subtraction of heat, Choose one: A. it expands. B. it contracts. C. its molecules speed up. D. it undergoes adiabatic heating.

Answers

When air (ideal gas) moves from a region of high pressure to a region of low pressure, with no addition or subtraction of heat, it expands.

What is Isothermal expansion of ideal gas?

Isothermal expansion of an ideal gas involves increase in the gas volume at constant temperature. The volume of the gas increases while its pressure decreases.

When air moves from a region of high pressure to a region of low pressure, it is no longer adiabatic (constant pressure).

Thus, when air (ideal gas) moves from a region of high pressure to a region of low pressure, with no addition or subtraction of heat, it expands.

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If a bug with a mass of 5 grams flies into the windshield of a moving 1000 kg bus, which will have the most force?

A. The bug on the bus
B. The bus on the bug

Answers

Both will have equal forces because the force exerted on the bus will be equal to the force experienced by the bug.

Newton's third law of motion

Newton's third law of motion states that action and reaction are equal and opposite.

This implies that, the force exerted on an object is equal to the reaction experienced by the object.

Fa = -Fb

The force exerted on the bus will be equal to the force experienced by the bug.

Thus, both will have equal forces.

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What gas law states that volume and pressure are inversely proportional at constant temperature and moles?.

Answers

Answer: Boyle's Law

Explanation:

Boyle's law states that the volume and pressure are inversely proportional to each other at constant temperature and moles

Ie. Boyle’s law: PV = constant at constant T and n or:

[tex]P_{1} V_{1}=P_{2} V_{2}[/tex]

Would a glowing rod be hotter if it was white or red? Why?

Answers

Answer:

White

Explanation:

Red comes from the lowest energy range of and blue from the highest.

A box is pushed 7 m to the left in 3 s. What is the block's average speed to the

nearest tenth?


2. 33 m/s

0. 43 m/s

2. 3 m/s

0. 4 m/s

Answers

Answer:

2.3 m/s

Explanation:

Speed is  measured in m/s

7 m / 3 s =   2.3 m/s   ( to the nearest tenth)

The average speed of block is 2.33 m/s.

What is the relation between Speed, Distance and Time?Speed is distance travelled by time.Therefore Speed = Distance / TimeS = D / T

How to calculate the average speed of the box?The distance travelled by a box is 7 m.A box is travelling 7 m for 3 second.

So, from the formula,

                       ∴  S = D / T

                       ∴  S = 7  / 3

                       ∴  S = 2.333 m/s

To the nearest tenth, S = 2.3 m/s.

Thus, The average speed of block is 2.33 m/s.

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I need help this is for physical Science! (need asap)

Answers

Answer:

2 seconds

Explanation:

mhm

The amount of work done to produce a sound determines which property of sound waves?.

Answers

Amplitude because Sound waves are pressure waves, and the higher the amplitude, the higher the energy created and the louder the sound is. Hope this helps

hich of these actions would increase heat transfer between two objects?

establishing their thermal equilibrium
increasing the area of their contact
using objects with similar specific heats
reducing the time of their contact

Answers

Answer:

increasing the area of their contact

Explanation:

ACTIVITY 3: THE CHOICE IS YOURS!

Directions: Read each item carefully. Choose the letter of the best answer.

____1. What is the advantage of an electromagnet compared to a permanent magnet?

A. Electromagnet is lighter.

B. Electromagnet can be turned on and off.

C. Permanent magnet cannot be used to pick up metals.

D. Electromagnet can be used for attracting more metals.

____2. What are the factors that affect the strength of an electromagnet?

A. Battery, magnet, and core

B. Dry cells, nail, and magnet

C. Number of coil, number of magnets, and wire

D. Number of coils/wire, number of batteries/dry cells, and properties of the core

____3. What could make an electromagnet stronger?

A. Use a weaker battery.

B. Reverse the poles of the magnet.

C. Remove all the coils and the nail.

D. Add more coils of wire to the nail.

____4. Complete this sentence:

"In order to form an electromagnet, a/an _______ current should flow through a coil of

______ covered around a/an ______ core. "

A. Electric, wire, iron C. Iron, electric, wire

B. Iron, wire, electric D. Wire, iron electric

_____5. You conducted an experiment using a very strong electromagnet. How can

you make it weaker?

A. Add more loops. C. Add more batteries.

B. Use a thicker wire. D. Wrap the wire loosely.

(LAS)-Science week 6 QR-3​

Answers

Answer:

1 B      2 D  3  D    4 DC  wire  ferrite   5 D

Explanation:

A cat pushes a 0.25 kg toy across the floor, causing it to accelerate at 32 m/s?. What
net force would the cat have had to apply to the toy in order to cause this acceleration?

Answers

Answer:

8 N

Explanation:

F = ma, therefore F = 0.25 kg * 32m/s^2.

The ____ of emitted light depends directly on the energy between the two orbits and this determines the color of the light

Answers

The frequency of emitted light is directly proportional to the energy between the two orbits and this determines the color of the light.

What is light?

Light can be defined as a form of electromagnetic waves that does not require any medium for its propagation. This ultimately implies that, light is a form of wave that is generally referred to as a visual signal because it can be seen with the eyes.

According to the model of light wave, the frequency of emitted light is directly proportional to the energy between the two orbits and this determines the color of the light.

In conlcusion, the frequency of emitted light is highly dependent on the energy between the two (2) orbits.

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What direction would the north pole of a bar magnet point if you were to hang the bar magnet from a thin string?.

Answers

The end that is marked with ’N’ will point to the Arctic. The ‘S’ end will point toward the Antarctic. A bar magnet is ‘just’ a big heavy compass needle. The ‘N’ and ‘S’ marking are made to help travelers find their way around the globe.

Yes, it IS confusing to have the ’N’ end of a compass point toward the north axis of the earth. These conventions were well in place LONG before anyone understood that ‘Opposites Attract’. But now that we DO know that ‘Opposites Attract’ we are left with the unfortunate reality of compasses, bar magnets and the earth. There are gazillions of magnets and only one earth! So the ‘convention’ has been made that the magnets are labeled correctly! This means (unfortunately) that the Arctic area of the globe is actually the south end of the earthly magnet. The earth is a giant (but very weak) electromagnetic and the lines of the magnetic field point to the Arctic Regions which is why all out magnets point that way. The magnetic field line dive INTO the earth in the Arctic Regions and OUT of the earth in the Antarctic regions.

I haven’t used the word ‘pole’ here, because magnetic poles don’t actually exist (as far as we know). Every magnet is actually an electromagnetic with electrical charges in motion creating the magnetic field.

A certain lever system is only 30% efficient. The following changes are considered:

change 1: Use a stiffer lever to reduce energy lost bending the lever.
change 2: Make a longer lever that will require less force.

Which change would make the lever more efficient?

Change 1 would make the lever more efficient because less energy would be lost.

Change 2 would make the lever more efficient because this would make it easier to lift.

Change 1 would make the lever more efficient because this would make it easier to lift.

Change 2 would make the lever more efficient because less energy would be lost.

Answers

Answer: Change 2 would make the lever more efficient because this would make it easier to lift.

Explanation:

The considered change is:  Make a longer lever that will require less force because it  would make the lever more efficient because this would make it easier to lift.

What is  lever?

A beam is pivoted at a fixed fulcrum, to form a simple machine known as a lever. A body that can rotate about a point on itself is called a lever.

The lever is classified into three types based on where the fulcrum, weight, and effort are located. Additionally, leverage is a systemic mechanical advantage.

One of the six simple devices that Renaissance scientists identified. Leverage is the ability to increase an input force into a bigger output force through the use of a lever. The mechanical advantage of the lever is determined by the ratio of output force to input force.

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A star of apparent magnitude +1 appears _____ than a star of apparent
magnitude +2.
O fainter
O farther away
o either brighter or fainter, depending on the distance to the stars
O brighter

Answers

The correct answer is going to be B . Farther away

A star of the apparent magnitude of +1 would appear farther away than a star of the apparent magnitude of +2. Hence, option B is correct.

What is a star?

In astronomy, a star is a brilliant plasma spheroid that is held together through gravity. The Sun is the planet's closest star. The human eye can see a great number of other stars at night, but due to our planet's size, they seem alike stationary points of light.

Numerous of the shining stars were given names, whereas the most notable stars have been grouped into constellations and asterisms. The known stars have been recognized and given standard designations in star inventories that astronomers have put together.

The birth of a star is caused by the gravitational attraction of a gaseous nebula made largely of hydrogen, helium, and traces of transition metals. Its overall mass is the primary factor influencing how it will develop and end up.

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Iron man crashes into a parked car with a force of 8,000 newtons, resulting in a acceleration of 1.14 m/s. if the car has a mass of 1000 kg what is the coefficient of kinetic friction between the car tires and the road?

Answers

Answer:

0.8

Explanation:

F=uR

F=8,000N

R= 1000*10=10000

u=F/R

u= 8000/10000

u=0.8

The map represents the state of California. The San Andreas Fault and several associated faults have been labeled, as well as seven major cities. Use the map and your knowledge of science to answer the questions below.

California fault lines

Earthquakes are likely to occur along the San Andreas Fault.

What type of fault is it?

How are plates moving at this type of fault?

Which labeled city has the greatest risk of damage from an earthquake occurring along the San Andreas Fault? Why is it at the greatest risk?

Answers

Answer:

Earthquakes are likely to occur along the San Andreas Fault.

Explanation:

Why does the force of gravity increase when one object gets closer to another object?

Answers

Answer:

because the gravity gets stronger as the 2 objects get closer. so the 2 are basicly merging

Explanation:

Since the gravitational force is directly proportional to the mass of both interacting objects, more massive objects will attract each other with a greater gravitational force. So as the mass of either object increases, the force of gravitational attraction between them also increases.

hope this helps!

FUN FACT: we achaly all have gravity, its just so weak that we cant feel it.

What is wave speed ? A. the distance a wave travels in a given amount of time B. the height of a wave C. the same no matter what the medium D. the distance between two similar points on a wave

Answers

Answer:

The answer is A

Explanation:

 The distance that a wave length travels

Answer:

The correct Answer is A. The distance a wave travels in a given amount of time.

Hope this helps you!!!

Please Mark me AS BRAINLEAST!!!

Why does the moon appear to move across the sky during the night?.

Answers

Usually it appears that the moon is moving because of the clouds! if there's no clouds then it's just kinda an illusion you get in the car lol because the car moves but the moon stays in the same place, and because it's so big you can see it anywhere!

Nerdy answer: Because Earth rotates on its axis from west to east :I

Usually it appears that the moon is moving because of the clouds! if there's no clouds then it's just kinda an illusion you get in the car lol because the car moves but the moon stays in the same place, and because it's so big you can see it anywhere! Nerdy answer: Because Earth rotates on its axis from west to east :I

Whcen the north pole is tilted toward the sun, which area has the fewest hours of daylight?.

Answers

When the north pole is tilted toward the sun, the southern hemisphere has the fewest hours of daylight due to winter season in it.

Which area has the fewest hours of daylight?

When the North Pole is tilted toward the sun, the Northern Hemisphere has the most hours of daylight while on the other hand, the Southern Hemisphere has the least hours of daylight.

So we can conclude that When the north pole is tilted toward the sun, the southern hemisphere has the fewest hours of daylight due to winter season in it.

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Kate wants to know which foil paper keeps bread fresher. She wraps three identical
pieces of bread in different types of Foil paper. She placed the pieces of bread in her
kitchen counter for one week. What scientific term describes the pieces of bread?
A.constant
B. responding variables
C. prediction
D. manipulated variables
A. constant

Answers

Answer:

hi

Explanation:

The answer is Responding Variables Hope this helps :D

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Write the first six terms of the numerical pattern that starts at zero and follows the rule add three Which of the following flood mitigation techniques might a city use? Select the two correct answers.A. Restricting new homes from being built on the floodplain B. Building homes on the perimeter of the floodplain C. Building homes in the middle of the floodplain D. Relocating existing homes off of the floodplain E. Relocating animals off of the floodplain Which two types of insurance are optional?A. Auto and health insuranceB. Auto and homeowners insuranceO C. Life and auto insuranceD. Health and life insurance y = 3x + 1, -x + 2y = -3 ____________ works of art are created on frosted parchment-like material or surface, which can be made from young calf skin that is stretched out.. He arrived late.His reason being that he had an appointment elsewhee New Guniea and Australia have many similar animals becuase experts think that theywere one land mass during the last ice age.TrueFalse A laborer working on an oil rig was called ____________. a. a prospector b. a roughneck c. a wildcatter d. a refiner What is the third step of the hydrogen fusion process? e v energy 2 energy energy 6 2 2 energy 2v In the Giver what does Jonas want control over? which features used to identify igneous sedimentary and metamorphic rock samples Which layer of the earth is made of hot solid iron and nickel?. use Mental Math to determine if the circumference of a circle with a radius of 5in will be greater than or less than 30 in write an argument that can be used to justify your solution Phylogeny is the evolutionary history of related groups of organisms. Organisms are grouped into taxa based on homologous characteristics, shared traits that result from common ancestry. Which statement is true?. Which of the following is least likely to be a warning sign that one's debt is at a critical point? a. all credit cards are at their limits b. having several credit cards c. making only minmum payments on credit cards d. using cash advances to pay bills please select the best answer from the choices provided. a b c d Maya is hoping to hire lifeguards to work at her community pools this summer. What is the first step she must take in this process Substance A is added to water. After it is added, hydrogen ions are produced and accumulate in the solution. Most of the hydrogen ions react with water molecules to produce a new substance, which is Substance B. What type of substance was added to the water (Substance A), and what new substance was produced (Substance B)?A) Substance A is a base. Substance B is a group of hydroxide ions. B) Substance A is an acid. Substance B is a group of hydronium ions. C) Substance A is an acid. Substance B is a group of hydroxide ions. D) Substance A is a base. Substance B is a group of hydronium ions Please I need help!! Earl made a 1/2 pan of brownies using 2/3 cup of sugar How much sugar will it take for a whole pan of brownie I am thinking of two numbers whose difference is 32. Twice the smaller number is 12 more than the larger number. What are my numbers?