Why should the temperature of mammals be regulated​

The surface temperature of the stars whose infrared radiation have a wavelength of  2 µm is 1.45×10³ K.

Temperature is the measure of hotness or coldness of a thing or place.

To calculate the temperature of the stars, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, the surface temperature of the stars is 1.45×10³ K.

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Answer:

Explanation:

The time taken can be found by using the formula

\(t = \frac{d}{v} \\ \)

d is the distance

v is the velocity

From the question we have

\(t = \frac{2000}{70} = \frac{200}{7} \\ = 28.571428 ...\)

We have the final answer as

Hope this helps you

Answer:

2000/70=28 R40

Explanation:

Answer:

Frequency is the number of complete oscillations or cycles or revolutions made in one second.

Answer:

b

Explanation:

The techniques that scientists can use to determine the characteristics of Earth's layers include:

Waves were used by scientists to study the layers of the Earth. This was done through the use of seismic waves. These are the waves that are generated by nuclear test explosions.

Also, another technique to determine the characteristics of Earth's layers is the use X-rays to obtain a view of Earth's interior layers.

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Answer:

study how seismic waves travel through different layers

use X-rays to obtain a view of Earth's interior layers

:)

Explanation:

The thermosphere has the highest temperature of any layer in Earth’s atmosphere.

The term troposphere is the region that is found  12 to 50 kilometers from Earth’s surface. This region is found to be the region where you can find a lot of gases.

Both the Troposphere and the stratosphere  get colder as altitude increases. However, the ozone in the stratosphere  protects people from ultraviolet (UV) radiation.

The thermosphere has the highest temperature of any layer in Earth’s atmosphere.

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Answer:

The vacuum of space

Heat management problems

The difficulty of re-entry

Orbital mechanics

Micrometeorites and space debris

Cosmic and solar radiation

The logistics of having restroom facilities in a weightless

Explanation:

Answer:  -5200 newtons

Your teacher may want you to type in just the positive version of this number.

=============================================================

Explanation:

We have these given values

The acceleration that occurs is....

a = (Vf - Vi)/t

a = (0 - 28)/10.5

a = -28/10.5

a = -2.66666666666667

This acceleration is approximate. The units for the acceleration are in m/s^2.

We'll use this acceleration value in Newton's Second Law equation

Force = (mass)*(acceleration)

F = m*a

F = (1950 kg)*(-2.66666666666667 m/s^2)

F = (1950*(-2.66666666666667)) kg m/s^2

F = -5200 newtons

The negative force value is to indicate the force is working against the car's original direction of motion. For instance, if the car is driving to the right, then a force to the left is applied as the braking force to slow the car down. It might be helpful to draw out the free body diagram.

Answer:

Explanation:

(a) To find the density of the oil, we can use the formula for pressure difference in a fluid column:

ΔP = ρgh

where ΔP is the pressure difference, ρ is the density of the fluid, g is the acceleration due to gravity, and h is the height of the fluid column.

Plugging in the given values, we have:

0.125 atm = ρgh = ρ(9.81 m/s^2)(1.50 m)

Solving for ρ, we get:

ρ = 0.125 atm / (9.81 m/s^2 x 1.50 m) ≈ 0.00847 g/cm^3

Therefore, the density of the oil must be approximately 0.00847 g/cm^3.

(b) On Mars, the acceleration due to gravity is 0.379 times that of Earth, or g_Mars = 0.379g_Earth. The pressure difference between the top and bottom of the oil column will be:

ΔP_Mars = ρgh_Mars = ρg_Earth(0.379)(1.50 m)

Using the density we found in part (a), we have:

ΔP_Mars = (0.00847 g/cm^3)(9.81 m/s^2)(0.379)(1.50 m) / (1 atm/101325 Pa)

ΔP_Mars ≈ 0.019 atm

So, the pressure difference between the top and bottom of the oil column on Mars will be approximately 0.019 atm, or about 0.15 times the pressure difference on Earth.

Answer:

The pressure difference (in Earth's atmosphere) between the top and bottom of the oil column on Mars is 0.045 atm.

Explanation:

(a) To find the density of the oil, we can use the formula for pressure difference in a fluid column: ΔP = ρgh, where ΔP is the pressure difference, ρ is the density of the fluid, g is the acceleration due to gravity, and h is the height of the fluid column.

We know that the pressure difference is 0.125 atm, the height of the column is 1.50 m, and the acceleration due to gravity on Earth is 9.81 m/s². Plugging in these values, we get:

0.125 atm = ρ(9.81 m/s²)(1.50 m)

Solving for ρ, we get:

ρ = 0.00803 g/cm³

Therefore, the density of the oil must be 0.00803 g/cm³.

(b) If the vehicle is taken to Mars, where the acceleration due to gravity is 0.379g, we can use the same formula to find the pressure difference:

ΔP = ρgh

We know that the height of the column is still 1.50 m, but the acceleration due to gravity is now 0.379g. Plugging in these values, we get:

ΔP = (0.00803 g/cm³)(9.81 m/s²)(0.379)(150 cm)

Solving for ΔP, we get:

ΔP = 0.045 atm

Therefore, the pressure difference (in Earth's atmosphere) between the top and bottom of the oil column on Mars is 0.045 atm.

Two identical metal spheres carry charges of + q and - 2q respectively.

It is given that initially sphere has different charges and momentarily brought in contact with each other.

When the spheres are touched then charge is equally redistributed among spheres such that now they possess the equal amount of charges.

When they are suspended from the thread their separation increases compared to previous situation because now the value of force increases because of the change in the product of charges.

For example, Suppose initially they possess 15 C and 17 C charge and after redistribution they both possess 16 C  of charge.

Product of charges=15*17=255

Final Product of charges=16*16=256

As force depends upon the Product of the charges so there will be more repulsive force.    

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When a body of mass 12kg travelling at 4.2m/s² collides with a second body of mass 18kg at rest, their common velocity after the collision is 1.68 m/s.

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Answer:

Newton's first law

Explanation:

Newton's first law states that if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force. Therefore, when the ice is smooth, friction gets lesser, and the force acted on that Puck will be decreased.

Answer:

The first law states that “objects at rest and objects in motion remain in motion in a straight line unless acted upon by an unbalanced force”. Keeping the ice smooth will make sure there is not friction, friction would slow the puck down

Explanation:

The first law states that “objects at rest and objects in motion remain in motion in a straight line unless acted upon by an unbalanced force”. Keeping the ice smooth will make sure there is not friction, friction would slow the puck down

The velocity vector is always tangential to the motion path for a particle with curvilinear motion. The velocity of a particle describes the rate of change of its position over time and its direction is always tangent to the path of the particle's motion.

The acceleration vector describes the rate of change of the velocity and its direction can be either tangential or normal to the motion path, depending on whether the particle is changing speed or direction.

Yes, vectors and scalars are different. A scalar is a physical quantity that has only magnitude and no direction. A vector, on the other hand, is a physical quantity that has both magnitude and direction, such as velocity, force, or displacement.

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Answer:

An axis is an invisible line around which an object rotates, or spins. The points where an axis intersects with an object's surface are the object's North and South Poles.

Answer:

22 s

Explanation:

time = distance / velocity

We know that distance = 770 m and velocity = 35 m/s.

t = d / v

t = 770 m / 35 m/s

t = 22 s

It takes 22 seconds to cover 770 m. Hope this helps, thank you !!

The force that will have the biggest turning effect on the heavy trapdoor is the one that is applied the furthest from the pivot point, or the point around which the trapdoor rotates.

The farther a force is from the pivot point, the greater the lever arm is, and the greater the turning effect it will have. For example, if there is a force being applied to the edge of the trapdoor, it will have a larger turning effect than a force being applied closer to the pivot point. Similarly, a force being applied to the top of the trapdoor will have a larger turning effect than a force being applied to the bottom.

It's also important to consider the magnitude of the forces being applied. If one force is much larger than the others, it will have a greater turning effect, even if it is applied closer to the pivot point.

It's worth noting that the forces acting on the trapdoor may be balanced, meaning that they cancel each other out and do not cause the trapdoor to rotate. In this case, the trapdoor will remain in its current position.

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Based on the flow of energy that's in the lake, it can be deduced that the diatoms and algae will have the highest concentration.

Energy flow refers to the flow of energy through living organisms that are within an ecosystem. Energy is passed from one trophic level to the next trophic level.

If the farmer sprays a field with chemical fertilizer, the organism that would contain the highest concentration of the chemical fertilizer are diatoms and algae since they're at the bottom of the ecosystem.

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p = 36 kgm/s

v = 4m/s

we know that,

p = mv

so,

\(m = \frac{p}{v} \)

\(m = \frac{36}{4} \)

\(m = 9kg\)

Answer:

3000 J (joules)

Explanation:

Use the formula for kinetic energy which is:

\( k.e = \frac{1}{2} mv ^{2} \)

Where m is the mass and v is the velocity. If we put the values into the formula we get: 0.5 * 15 * (20)*(20) = 3000J

Answer: 7260,39

Explanation:

The conservation of momentum is the consequence of Newton's third law. When a collision between two bodies occurs, then the force applied by one body is the same as the force applied by the other body but in the opposite direction. The bodies contact each other simultaneously; therefore, the time for both the bodies remains the same. Since the impulse is the product of force and time, therefore, the impulse is the same for both the bodies. Moreover, the impulse is the same as the momentum; therefore, the momentum is also the same. Hence, the momentum remains conserved during the collision.

The momentum is conserved during the collision only, but if a box slide on the table, then the momentum will be not be conserved as there is no collision during the sliding of the box.

Answer:

True

Explanation:

the independent variable would be like if the psychologist is experimenting the impact of sleep deprivation, sleep deprivation would be the independent variable that is being manipulated or changing its level systematically in the experiment.

Answer:

0

Explanation:

Since every value is constant, it shows us that there is no induced emf in the loop. This is according to Faraday's Law [ ε = -N(Δф/Δτ) ].

Best of Luck!

Approximately 18% of girls and 24% of males in the United States smoke as of 2019, according to the Centers for Disease Control and Prevention (CDC).

In general, men are more likely than women to use any type of tobacco product. 15.6% of adult females and 16.7% of adult males smoked cigarettes in 2015. These variations could be attributed to a mix of biological (especially ovarian hormones), cultural, and behavioural elements.

India is the nation with the second-highest number of tobacco smokers in the world with 267 million users (behind China). There are about 100 million smokers in the world today who are over the age of 15. (cigarettes and bidis).

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Question:

"In the United States, about what percentage of females and what percentage of males smoke?

a. 15%; 30%

b. 18%; 24%

c. 26%; 21%

d. 30%; 30%"

The velocity of the electron after moving a distance of 1cm in the electric field is 5.95×10⁶m.

Electric field is the physical field that surrounds a charge.

a=F/m=qE/m

E= electric field

m= mass of electron

=(−1.60×10^−19C)(3×10³N/C)/(9.11×10^-31kg)

=10¹⁵×0.526m/s²

v0=initial velocity of the electron =5×10⁶m/s

a=acceleration of the electron =10¹⁵×0.526m/s²

Δx=distance moved by the electron in east direction =1cm=10^-2m

=25×10¹²+10.52×10¹²

=35.52×10¹²

Thus , we can conclude that the velocity of the electron after moving a distance of 1cm in the electric field is 5.95×10⁶m.

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Answer:

Roro's total travel time = 6 seconds out of which he rested for 2 seconds

Distance covered by Roro = 8 meters

Explanation:

Given that :

Jojo:

Constant velocity, v = 3m/s

Travel time = h

Roro:

Constant velocity, v = 2m/s

Roro rest for 2 seconds

Travel time = h - 2

Recall:

Distance = speed * time

Distance covered by Jojo:

3 * h = 3h

At this distance ;

Roro's distance = 3h - 10

Using formula :

Roro's distance = 2 * (h - 2)

Hence,

2(h - 2) = 3h - 10

2h - 4 = 3h - 10

2h - 3h = - 10 + 4

-h = - 6

h = 6

Hence, Roro moved for :

h - 2 = 6 - 2 = 4seconds

Distance moved by Roro:

2(h - 2) = 2(6 - 2) = 2(4) = 8 meters

Yes, if a body is floating in a liquid, the rise in the liquid level is equal to the body height. This phenomenon is known as Archimedes' principle.

Archimedes' principle says when a body is immersed in a fluid (liquid or gas), it experiences an upward buoyant force equal to the weight of the fluid displaced by the body. Buoyant forces act in the opposite direction to gravity.

When a body floats in a liquid, it displaces a volume of liquid equal to its volume. As a result, the liquid level rises by an amount equal to the height of the submerged part of the body.

This principle holds for objects that float or are partially immersed in a liquid, such as a buoyant boat or a floating object. However, if the body sinks completely into the liquid, the liquid level rise will no longer be equal to its height. Instead, it depends on the density and volume of the submerged object.

Answer:

D) 8

Explanation:

Due to the octet rule the most stable atoms will have 8 valence electrons.