At the end of the 4th half-life, how much of a material will have decayed?

The only way to remain in orbit indefinitely is to make sure that no part of the orbit passes through any air molecules. There are too many of those in a low earth orbit. So a low earth orbit gradually loses energy when the satellite hits air molecules.

Answer: 150000 g

Explanation:

Firstly, we need to calculate the volume of the tank [tex]V_{tank}[/tex]:

[tex]V_{tank}=(length)(width)(height)[/tex]

[tex]V_{tank}=(100 cm)(50 cm)(30 cm)=150000 cm^{3}[/tex] (1)

Now, [tex]V_{tank}[/tex] is the volume that has to be filled with water, this means the volume water occupies in the tank [tex]V_{water}[/tex] must be equal to the volume of the tank:

[tex]V_{water}=V_{tank}=150000 cm^{3}[/tex] (2)  

On the other hand, the density of water [tex]\rho_{water}[/tex] is [tex]1 g/cm^{3}[/tex] and establishes the relation between its mass [tex]m_{water}[/tex] and its volume [tex]V_{water}[/tex]:

[tex]\rho_{water}=\frac{m_{water}}{V_{water}}[/tex] (3)  

Clearing [tex]m_{water}[/tex]:

[tex]m_{water}=\rho_{water} V_{water}[/tex] (4)  

[tex]m_{water}=(1 g/cm^{3})(150000 cm^{3})[/tex] (5)  

Finally:

[tex]m_{water}=150000 g[/tex]

Answer:

the product of 43.43.43.43 is 774

In conclusion, the given numbers expressed in the standard exponential form are 43.43 × 10⁴, 1.001 × 10⁵, and p⁵, reflecting their respective digit factors and exponential factors with precision and clarity.

To write the given numbers in standard exponential form, we express them as a product of a digit factor and an exponential factor. Each number is rounded to four significant figures.

These representations conform to the standard exponential notation, facilitating concise and standardized expression of numerical values, particularly in scientific and mathematical contexts. By adopting this format, numerical data can be presented uniformly, enhancing clarity and facilitating ease of comprehension across various disciplines and applications, from physics and engineering to finance and beyond.

Answer:

Always equal to zero

Explanation:

In a action reaction two pair forces comes into play.

These forces are opposite in nature but equal. Suppose a pair of force is acting on any object.

Let the first force acting on one direction is -F

force  acting on opposite direction = +F

If we sum these forces, -F + (+F) = 0

The sum of the forces in the pair of action and reaction forces are always equal to zero.

Answer : Option C

Explanation:

The action force when applied to the surface or body, in contact, produces a reaction force. This reaction force is produced in an strength or force equal to that of the action force applied as a pure form of reaction and is opposite to the direction of the action force applied.

Hence the action force and reaction force are opposite in their application and so by the convention, the action force gets positive force and reaction force gets negative force.

Sum of action reaction force pair = action force - reaction force = 0.

Answer:

No.  Buoyant force is equal to the weight of the displaced fluid.

B = mg

If ρ is the density of the fluid and V is the displaced volume:

B = ρVg

For fully submerged objects, where the displaced volume equals the volume of the object, buoyant force will be different in different fluids.

For floating objects, buoyant force equals the weight of the object, so it will be the same for any liquid that the object floats in.

Final answer:

The number 0.0037010 contains six significant figures, with the leading zeros serving as placeholders and therefore not significant. The significant figures are the digits 3, 7, 0, 1, 0.

Explanation:

The number 0.0037010 has six significant figures. In this number, the leading zeros are not counted because they serve only as placeholders for the decimal point. The significant figures begin with the first nonzero digit; therefore, the significant figures in this number are 3, 7, 0, 1, 0 (including the trailing zero because it is to the right of the decimal point and in a number that contains other significant figures).

When using exponential notation to express a number, like expressing 0.0037010 as 3.7010 × 10-3, it becomes clearer that all digits in the number 3.7010 are significant, and the exponent simply locates the decimal point.

Special consideration for zeros is important in significant figures. Any zero that is to the right of the decimal point and to the right of a nonzero digit is a significant figure. This is an essential concept in measurements and scientific notation for clarity and precision.

One liter of water is closest to having a mass of 1 kilogram. Thus, the correct option is C.

A Mass may be defined as one of the fundamental physical quantities that significantly estimate the amount of matter in a body. It is a dimensionless quantity that represents the amount of matter in a particle or object.

The actual mass of one liter of water is 990 grams, which is accurately 10 grams sort of 1000 grams which is equal to 1 kilogram. While other option like the average size of a banana does not correlate with mass.

The average of a person also does not make any sense with respect to the mass of 1 kg.

Therefore, one liter of water is closest to having a mass of 1 kilogram. Thus, the correct option is C.

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Answer:

It takes the train 7.5 seconds to reach top speed

The train travels 112.5 meters before it reaches its top speed

Explanation:

The Metro Rail makes a stop at NRG Stadium to pick up some Texans

fans after the game

After  all the passengers board, the train accelerates at a rate of 4 m/s²

to a top speed of 30 m/s

We need to find the train takes how many seconds to reach the

top speed

Given is:

→ The train start from rest, then its initial speed u = 0

→ It acceleration a = 4 m/s²

→ Its top speed v = 30 m/s

To find the time we can use this rule;

→ [tex]t=\frac{v-u}{a}[/tex]

→ [tex]t=\frac{30-0}{4}=\frac{30}{4}=7.5[/tex] seconds

It takes the train 7.5 seconds to reach top speed

Now we need to find how far the train travels before reaches top speed

We can use this rule;

→ v² = u² + 2as, where s is the distance

→ v = 30 m/s , u = 0 , a = 4 m/s²

Substitute these values in the rule

→ (30)² = 0 + 2(4) s

→ 900 = 8 s

Divide both sides by 8

→ s = 112.5 m

The train travels 112.5 meters before it reaches its top speed

Answer:

The official measurement unit for energy is the Joule (J).

Explanation:

Answer:

The chemical reactions involves changes in energy due to the changes in the breaking and building of bonds.

Explanation:

The changes in energy that chemical reactions involves are:

Endothermic: The chemical reactions which absorbs the energy those chemical reactions are called endothermic chemical reactions.

Exothermic: The chemical reactions which releases the energy those chemical reactions are called exothermic chemical reactions.

The similarity in the reactions is both reactions are related to the change in energy. In one reaction the energy is absorbing and in another reaction the energy is releasing.

Answer:

Both reactions release energy.

On Plato!!!

Explanation:

Answer:

The acceleration of this helicopter is [tex]2 m/s2[/tex]

Explanation:

In this question the velocity changes from 30 m/sto 40 m/s in 5 seconds.

Initial velocity u= [tex]30m/s[/tex]

Final velocity u= [tex]40m/s[/tex]

Time t= [tex]5s[/tex]

Acceleration is defined as the rate of change of velocity. It is given by the equation

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

      =[tex]\frac{40-30}{5}[/tex]

= [tex]\frac{10}{5}[/tex]  

= [tex]2 m/s2[/tex]

All moving bodies aren’t necessarily accelerated. To be identified as accelerating, a body should have its velocity changing. Thus a body in uniform motion is not accelerating since its velocity is constant.

Answer:

A helicopter’s speed increases from 30 m/s to 40 m/s in 5 seconds.

What is the acceleration of this helicopter?

2

m/s2

Explanation:

Correct on egde

Answer:

gasoline and natural gas

electricity and coal

heating homes and gas

Explanation:

The fossil fuel with its common use is as follow:

2. coal

3. natural gas

1. oil

An extracted and burnt fossil fuel is a hydrocarbon-containing substance that naturally originated in the Earth's crust from the remnants of extinct plants and animals. Coal, oil, and natural gas are the three primary fossil fuels.

The most popular fossil fuel is oil. The many distinct organic chemicals that make up crude oil are converted into products throughout the refining process.

One significant drawback of fossil fuels is pollution. This is due to the greenhouse effect they produce when burnt, which releases carbon dioxide. Additionally, this is the primary cause of the current earth's global warming.

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Answer:

(a) 200.0628 N   ;   ( b) 4.08Kg

Explanation:

We know,

w = mg        [here w= weight , m= mass , g= gravity]

now,

gravity on earth (g) =9.807 m/s²

mass of the spanner (m)=?

weight of the spanner on earth(w) = 40N

                                              ⇒ w = 40N

                                              ⇒m g =40N

                                              ⇒m = (40/g) Kg

                                              ⇒m= (40/9.807)Kg

                                             ∴m=4.08Kg

∴mass of the spanner on earth = 4.08Kg

We know,

Mass is the amount of matter in an object . So mass will remain same both on earth and jupiter.

So,

(b)The mass of the spanner on jupiter =  4.08Kg

Now,

The mass of the spanner on jupitar (m) =  4.08Kg

Gravity on jupiter (g*) = 5.g              [5 times on earth]

                                   = 5 . (9.807)m/s²

                                   =49.035 m/s²

(a)    

∴weight of the spanner on jupitar(w*) = m g*

                                                            =(4.08 x 49.035) N

                                                            =200.0628 N

Answer:

1) Option b. The acceleration is positive when it is thrown up and negative when it is thrown down.

2) Option d. Both B & C

Explanation:

Question 1)

Acceleration is defined as the rate of change of velocity with respect to time.

[tex]a=\frac{v_{f}-v_{i}}{t}[/tex]

When an object is thrown up, its velocity is maximum at the initial point and decreases as the object moves up. Since, the velocity is decreasing, the acceleration will be negative. This can also be proven from the formula mentioned above. When the object is thrown up, initial velocity(vi) is maximum and the final velocity (v_f) is zero, as the object rests for a very tiny moment at its maximum point. This will give a negative numerator and hence the value of acceleration will be negative.

When an object is thrown down, its velocity is zero at the start of the motion and increases as the object falls down. Since, the velocity is increasing in this case, the acceleration will be positive.

Therefore, Option b, gives the correct answer.

Question 2)

When an object falls freely, it falls under the action of gravity under a constant acceleration known as gravitation acceleration. Gravitational acceleration is represented by g and is equal to 9.8 m/s².

Since, the textbook is falling freely, its acceleration will be constant i.e. equal to gravitational acceleration.

When the object falls down, with every second its velocity increases. The velocity in minimum(zero) at the start and is maximum just before the object hits the ground.

So, when the textbook is dropped, it will fall with constant acceleration and its velocity will be increasing.

Therefore, for this question, Both B and C are correct.

1.

Answer:

d.The acceleration is the same regardless of being thrown up or thrown down.

Explanation:

As we know that when object is in air then net force on object is given as

[tex]F = F_g[/tex]

here we know that

[tex]F_g = mg[/tex]

now we will have

[tex]ma = mg[/tex]

so we can say

[tex]a = g[/tex]

so in any case whenever object is in air its acceleration is vertically downwards and magnitude is equal to "g"

Answer:

Both B & C

Explanation:

As we know that when book is in free fall then due to weight of the book it will experience net downward force.

This force will exert

[tex]F = mg[/tex]

now we know that

[tex]a = g[/tex]

so while in free fall the acceleration due to gravity will remain constant on the book but speed will increase

so we have

b.The velocity increases

c.The acceleration remains constant

d. Both B & C

Answer:

C. Physics

Explanation:

Both energy and forces are all in the tier of Physics.

Answer:

40 mph

Explanation:

Velocity is displacement over time.  Displacement is the straight line distance between the starting point and ending point.

v = x / t

v = 320 mi / 8 hr

v = 40 mph

Prejudice is a unjustified and baseless attitude towards an individual only because of his membership of a social group. (Ex. Sara likes Jessica because she is in the art club but she absolutely despises Jonah because he is in the math club). Discrimination refers to unjust or negative treatment of a person or a group from other people because he/she belongs to a particular class, group or category. (Ex. Sara invites Jessica to her party, but not Jonah)

Answer:

prejudice is a negative attitude

discrimination is a negative behavior

Explanation:

got it right on edge

Answer:

x represents an electron and y represents a proton and a neutron.

Explanation:

electrons are the smallest particle in an atom and protons and neutrons are a lot larger. thats why only protons and neutrons are weighed in atomic mass. electrons are too small to make a difference in the atom's weight.

They want you to pick choice-A , but the whole question is poor and misleading.

The picture sorta kinda roughly presents the concept of the difference in MASSES ... one proton or one neutron has as much mass as about 1,840 electrons.

But things get very complicated on the scale of atoms and their components, and there's actually no such simple concept as the physical SIZE of any of these particles.

If ya wanna be absolutely technically correct, the picture is absurd, and the question has no answer.

Answer: Copper (Cu)

Neutrons‎: ‎35  Electrons‎: ‎29

Protons‎: ‎29 Atomic Number‎: ‎29

Explanation:

Answer:

Atomic number of copper is 29. The atomic number of an atom is determined by the number of protons in the nucleus. Therefore, there are 29 protons in an atom of copper. In a neutral atom, there are equal number of protons and electrons. Therefore, there are 29 electrons in a copper atom. Mass number of copper is 64.

Number of protons + Number of neutrons = mass number.

Therefore, number of neutrons = 63 -29 = 35

Answer:

Magnitude of boat's acceleration is 1.2 ms⁻²

Explanation:

Given data

Initial velocity = v₁ = 25 m/s

Final velocity = v₂ = 35 m/s

distance = s = 250 m

Acceleration = a = ?

Using 3rd equation of motion

                       2 a s = v₂² - v₁²

          2 × a × (250) = 35² - 25²

                  500 × a = 600

                             a = 600/500

                             a = 1.2 ms⁻²

Thus the acceleration of the boat is 1.2 m/s² until it travel up to 250 m from initial velocity 25m/s to final velocity 35 m/s.

The speedboat's change in velocity is 10 m/s and using the equations of motion, it's found that the time taken for this change is 10 seconds. By substituting these values into the formula for acceleration, the boat's acceleration is found to be 1 m/s² to the west.

To find the magnitude of the boat's acceleration, we first need to calculate the change in velocity, then divide it by the time it took for this change. In this case, the boat's velocity changes from 25 m/s to 35 m/s, therefore, the change in velocity, also known as delta-v, is 35 m/s - 25 m/s, which equals 10 m/s.

According to the equation for acceleration (a = Δv/Δt), where 'a' is the acceleration, 'Δv' is the change in velocity and 'Δt' is the change in time, however, we don't directly have the change in time. To find this, we can use the equation of motion, distance = (initial speed + final speed)/2 * time.

Substitute the initial speed (25 m/s), the final speed (35 m/s) and the distance (250m) into the equation. The time taken comes out to be 10 seconds. Substituting this obtained time and the change in velocity into the acceleration formula, we get acceleration = 10 m/s / 10 s, which equates to 1 m/s². Thus, the boat's acceleration is 1 m/s² to the west.

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Answer:

Angle of refraction

Explanation:

The incident ray is the ray before it reaches the surface.

The refracted ray is the ray after it reaches the surface.

n₁ is called the index of incidence.

n₂ is called the index of refraction.

θ₁ is called the angle of incidence.

θ₂ is called the angle of refraction.

They are related by Snell's law:

n₁ sin θ₁ = n₂ sin θ₂

Answer:

Angle of refraction

Explanation:

The angle θ2 represents the angle of refraction.

Refraction is the change in direction of light rays as it passes from one medium to another. As light rays passes from one medium to another, it changes direction.

If the incident light is passing from the less dense medium to denser medium, the refracted ray will bend towards the normal. In this case the angle of refraction 'r' is always less than the angle if incidence. (According to the diagram)

Similarly, If the incident light is passing from the denser medium to less dense medium, the refracted ray will bend away from the normal. In this case the angle of refraction 'r' is always greater than the angle of incidence.

Answer:

A.

Explanation:

Answer:

Resultant displacement, R = 38 meters

Explanation:

Distance covered the pirate, d = 37 m (due north)

Distance covered by pirate, d' = 8.5 m (due east)

Let R is the magnitude of his resultant displacement. The displacement of an object is equal to the shortest path covered by it. It can be calculated as :

[tex]R=\sqrt{d^2+d'^2}[/tex]

[tex]R=\sqrt{(37)^2+(8.5)^2}[/tex]

R = 37.96 meters

So

R = 38 meters

So, the magnitude of his resultant displacement is 38 meters. Hence, this is required solution.

Answer:

6.02 m/s²

Explanation:

Mathematically, Force is described as the product of mass and acceleration

F=mg

where F is force in Newton,N , m is mass in Kilograms and g is acceleration due to gravity.

Given that mass,m=1.29g

Weight=F=7.77 N

g=F/m = 7.77/1.29 =6.02 m/s²

Answer:

why should we do , do by your own , no sense

Explanation:

Answer:

Never Cry Wolf (1983)

Explanation:

1. Describe Tyler's scientific question.

Were the wolves the main killers of the rapidly decreasing of caribou population?

As he studies the population however, he discovers the wolves are not the main predators of the caribou at all, in fact the two species coexist peacefully. The real cause for the caribou population decline is discovered to be over hunting by the Eskimos and local hunters.

2. What was Tyler's hypothesis?

The first hypothesis that he addresses is the information he has received from the authorities and the decrease in population by the Wolves. However, as he approaches his behavior, he discovers that new hypotheses should be considered. This is due to the fact that he notes that the Wolves are not 'aggressive' as the compilations show, but also that they can live with the coribous in a peaceful manner.

This is why it poses three hypotheses:

- The wolves are not as aggressive as they seem, so a description of their lifestyle is necessary

- Wolves require another diet to survive in the winter in the absence of the caribous

- Wolves use a different sleep style from humans, so it is necessary to inquire if it is more effective than that of men.

3. Describe Tyler's experiment.

Lifestyle assimilation experiment

To understand the way of life of the wolves, Tyler tries to imitate him.

When approaching them, he establishes a store and begins his surveillance day and night.

Wolf population experiment

To gather more information about the wolf population and get an idea of the amount of wolves in the area, Mowat and a local Eskimo toured the Canadian Arctic to observe them.

Diet experiment

Upon observing the wolves, he discovered that the diet consisted of mice and not caribou. In order to demonstrate that this diet is possible, he decides to continue the same diet

4. What was the independent variable in Tyler's experiment?

The independent variable is mice, because you need to modify them to understand if they are enough or not for the diet.

5. What were the dependent variable(s)?

The dependent variable is proteins, minerals, carbohydrates and other foods that are part of a diet. In this case, the necessary to survive.

6. Describe the experiment's constants.

The constants are those variables that the researcher does not modify during his experiment. In this case the number of mice you eat per day.

7. What data was collected, recorded and analyzed?

For the particular case of the diet, he discovered that mice are enough to eat a diet. However, he also noted that the 10-minute leisurely sleep of wolves, during the day, is much more relaxing than the continuous 8 hours of sleep.

He also discovered that the population of wolves had decreased considerably.

8. What was Tyler's conclusion?

Indiscriminate hunting by the natives was decreasing the population of animals in the region.

9. How did Tyler publicize his results?

It is understood that the protagonist made a compilation of his results and returned to the 'civilization' shows his data obtained to the government entities for the respective action taking.

10. What could Tyler have done differently to increase the “validity” of the experiment?

The videographic and photographic record would have allowed to obtain many more details to understand the behavior of the animals.

11. Give a name to Tyler's Experiment.

Fun, food, and fear.

Answer: No new element forms.

Gamma decay differs from alpha decay and beta decay since there is no new element forms.

Explanation:

Among the three types of radio-active decay namely alpha decay, beta decay and gamma decay , gamma decay is the only one where a change in mass number or atomic number doesn’t occur. In gamma decay electromagnetic radiations are produced and the decaying atom doesn’t undergo changes   in atomic number or mass number. Thus no new elements are formed.

In alpha decay [tex](-2^4)[/tex] He nuclei is produced and the atomic number of decaying atom reduces by 2 and its mass number reduces by 4. In beta decay electrons [tex](-1^0)e[/tex]  or positrons [tex](1^0)e[/tex] are produced and depending on whether the product is electron or positron the atomic number of the atom increases or decreases by 1 respectively.

Answer: No new element forms.

Explanation:

Answer:It can slow down, it can speed up and it can change its direction.

Explanation:

Answer: d=vt

Explanation:d= the whole number m divide it by s ( how many seconds there are ). Like (5m/s) (3s) for an example

Answer:

The answer is D you were correct

Answer:

its D

hope this helps

Answer:

All atoms of an element are identical. The atoms of different elements vary in size and mass. Compounds are produced through different whole-number combinations of atoms. A chemical reaction results in the rearrangement of atoms in the reactant and product compounds.

HOPE THIS HELPED!!!!!!!!!!!!!!!!!!! XDDDDDDDDDDD

John Dalton's atomic theory proposed in 1803 described atoms as indivisible units of matter that combine in fixed ratios, reflecting the laws of definite and multiple proportions, with atoms not subject to creation or destruction. Later advancements revealed atoms are composed of subatomic particles, which possess properties differing from the atoms themselves.

John Dalton added new characteristics to the model of the atom by proposing Dalton's atomic theory in 1803. This theory brought forth the idea that all matter is composed of small, indivisible particles called atoms, which could not be created or destroyed. Dalton's theory was significant as it was based on experimental evidence, which included the laws of chemical combinations and the behavior of gases. However, contrary to Dalton's postulation that atoms are indivisible, we now understand that atoms can be divided into subatomic particles: electrons, protons, and neutrons, each with distinct properties.

Some tenets of Dalton's theory that were groundbreaking at the time include the conceptualization that chemical compounds contain elements in a fixed proportion by mass regardless of the quantity, supporting the law of definite proportions. Moreover, Dalton realized that a single element could combine in different ratios to form multiple compounds, which led to the understanding of the law of multiple proportions.

(a) In the absence of gravity, the marbles collide at the x-coordinate corresponding to the initial position of marble 1.

(b) Considering gravity, we calculate the time of flight for marble 2 and then find its horizontal distance traveled to determine the collision point.

To solve this problem, we'll first determine the time it takes for each marble to collide in the absence of gravity, and then we'll consider the effect of gravity to find the collision point with it. We'll use the kinematic equations for projectile motion.

Given:

Marble 1: Horizontal launch with speed v1 = 4.20 m/s and initial height h1 = 0.950 m.

Marble 2: Launched from ground level with speed v2 = 5.94 m/s at an angle.

(a) Collision point without gravity:

Time of flight for marble 1 (t1):

Using the kinematic equation: h = (1/2)gt^2

0.950 = (1/2)(0)t1^2

t1 = 0

Since marble 1 doesn't experience vertical motion, it remains at the initial height h1. Marble 2 will collide with marble 1 when it reaches the x-coordinate corresponding to the initial position of marble 1.

(a) Collision point with gravity:

Time of flight for marble 2 (t2):

Using the kinematic equation: h = v_iy t - (1/2)gt^2

0 = v_iy t2 - (1/2)gt2^2

Solving this quadratic equation for t2.

Horizontal distance traveled by marble 2:

x2 = v_ix t2

Collision point:

The collision point will have coordinates (x2, 0).