decide which of the following day-to-day activities might be considered aerobic exercise?
1.surfimg the web
2.taking a catnap
3.mowing the lawn
4.paying bills

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:

Year

Explanation:

Answer:

year

Explanation:

from homeschool

Answer:

27.0

Explanation:

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.

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:

(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: 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 answer is D you were correct

Answer:

its D

hope this helps

Answer: Option C: 0.3%

Explanation: The Earth has an abundance of water, but unfortunately, only a small percentage, is even usable by humans. The other 99.7 percent is in the oceans, soils, icecaps, and floating in the atmosphere and the other 0.3%  can be used.

So the correct option would be C: 0.3%

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: 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:

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:

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:

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

Explanation:

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.

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:

225 rpm

Explanation:

The angular acceleration of the fan is given by:

[tex]\alpha = \frac{\omega_f - \omega_i}{\Delta t}[/tex]

where

[tex]\omega_f[/tex] is the final angular speed

[tex]\omega_i[/tex] is the initial angular speed

[tex]\Delta t[/tex] is the time interval

For the fan in this problem,

[tex]\omega_i = 0\\\omega_f = 180 rpm\\\Delta t=4 s[/tex]

Substituting,

[tex]\alpha = \frac{180-0}{4}=45 rpm/s[/tex]

Now we can find the angular speed of the fan at the end of the 5th second, so after t = 5 s. It is given by:

[tex]\omega' = \omega_i + \alpha t[/tex]

where

[tex]\omega_i = 0\\\alpha = 45 rpm/s\\t = 5 s[/tex]

Substituting,

[tex]\omega' = 0 + (45)(5)=225 rpm[/tex]

Answer: A.) sensor

Explanation:

Homeostasis is the ability of the organism's inner body to regulate the internal environment in stable state with respect to the changes occurring in the external environment. It is usually done by the feedback controls.  

The maintenance of homeostasis within the body is essential. The following are the factors which controls the homeostasis. These includes:

1. Stimulus: It generate a response. It is an external factor which brings change in the internal body of the organism.

2. Receptor/ sensor: It detects the external stimulus and responds to the change.

3. Control center: The information from the receptor travels along the afferent pathway towards the control center. The function of the control center is to determine the response and controls the action.

4. Effector: The information from the control center travels down the efferent pathway to the effector. The function of the effector is to balance the stimulus to regulate and maintain homeostasis.

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:

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:

heyooo!!!

Sedimentary

hope this helps!!

Explanation:

When the sediments harden, the layers are preserved. Sedimentary rocks formed by the crystallization of chemical precipitates are called chemical sedimentary rocks.

Answer: Chemical sedimentary rocks.

Explanation: Those may be a type of sedimentary rocks called "chemical sedimentary rocks". This type of rock forms when mineral constituents in solution become supersaturated and inorganically precipitate.  Formed by deposit of dissolved substances, were the largest volume corresponds to masses of salts accumulated by supersaturation of seawater. When seawater is stagnant, it begins to evaporate and dissolved minerals precipitate, this process gives rise to evaporites, for example gypsum and gem salt.

Final answer:

The car's average speed is 20 m/s or 72 km/h, whereas the athlete's average speed is 6.25 m/s or 22.5 km/h. To convert from m/s to km/h, we multiply by 3.6.

Explanation:

Average Speed Calculation

To calculate the average speed of a car that travels 400m in 20s, you divide the total distance by the total time. The formula is:
Average speed = Total distance / Total time
Thus, the car's average speed is 400m / 20s = 20 m/s.

For the athlete who runs 1500m in 4 minutes (which is 240 seconds), the calculation is similar:
Average speed = 1500m / 240s = 6.25 m/s.

To convert the average speed to km /h, we need to convert meters per second to kilometers per hour. The conversion factor is 3.6 (since there are 3600 seconds in an hour and 1000 meters in a kilometer). Hence:
Car: 20 m/s * 3.6 = 72 km/h
Athlete: 6.25 m/s * 3.6 = 22.5 km/h

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:

Urbanization, oil spill, leaky landfill and deforestation are causes of pollution while desertification, smog, contaminated water are the effects of pollution.

Explanation:

Urbanization is generally associated with an increase in the number of industries. The waste materials in different forms from the factories pollute air, water and soil.

The effluents from factories released into rivers cause water pollution and harm the aquatic life. Water contaminated by industrial waste becomes unsuitable for drinking. Forests play a major role in controlling the amount of carbon dioxide in the atmosphere.

Deforestation increases the amount of carbon dioxide in the atmosphere.  Oil spills usually occur in oceans and seas and it causes water pollution and threatens aquatic life.

Answer:

Cause

industrial wastes dumped into rivers

oil spilled on land mixes with runoff

sewage dumped into rivers

Effect

destroyed natural habitats

fish die-off

spread of disease

Explanation:

plato

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:

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:

W is the answer

Explanation:

Answer: the answer is X

Explanation: the image formed by a diverging or concave lens is always virtual, erect and diminished. The image formed is on the same side as the object and always between the object and the lens. From the diagram above, X is in between object (w) and the lens

Answer:

Time needed is 2.5 seconds. The distance covered is 31.3 m

Explanation:

Answer:

displacement of the car will be 88.2 m

Explanation:

As we know that initial speed of the car is given as

[tex]v_i = 42 m/s[/tex]

after complete stop the final speed of the car is

[tex]v_f = 0[/tex]

now the deceleration caused due to applied brakes is given as

[tex]a = 10 m/s^2[/tex]

now by kinematics we will have

[tex]v_f^2 - v_i^2 = 2 a d[/tex]

[tex]0 - 42^2 = 2(-10)d[/tex]

[tex]d = 88.2 m[/tex]