A particale's velocity function is given by V=4t² + 3t - 2 with V in meter/second and t in second Find the acceleration at t-2 s 19m/s2.a 11m/s2.b 20m/s2.c 8m/s2 d 1507 SIMET 150 N 10 PEET 1655 PELLE

Answer:

42.11 years old

Explanation:

Given that:

In 2000, a 20-year-old astronaut left Earth to explore the galaxy; her spaceship travels at 2.5 x 10^8 m/s. She returns in 2040

To find her age we use:

\(\Delta t_m=\frac{\Delta t_s}{\sqrt{1-\frac{v^2}{c^2} } }\\\)

Δtm is  time interval for the observer stationary relative to the sequence of

events = 2040 - 2000 = 40 years

Δts is is the time interval for an observer moving with a speed v relative to the  sequence of event

v = velocity = 2.5 x 10^8 m/s

c = speed of light = 3 x 10^8 m/s

\(\Delta t_s=\Delta t_m}{\sqrt{1-\frac{v^2}{c^2} } }\\\Delta t_s=40\sqrt{1-\frac{(2.5*10^8)^2}{(3*10^8)^2}}\\\Delta t_s=22.11\ yr\)

Here age in 2000 is 20 year, therefore when she appear she would be 20 year + 22.11 year = 42.11 years old

Answer:

.

Explanation:

Answer:

the pelvice

Explanation:

1. The part that shows the body is accelerating is the first 2 hours (ABE). The acceleration is 20 Km/h²

2. The part that shows the body is coming to rest the last 2 hours (CDF)

3. The distance travelled in the first 2 hours is 40 Km

Acceleration is defined as the rate of change of velocity which time. It is expressed as

a = (v – u) / t

Where

From the diagram (ABE), we can see that the body starts from rest and attain a final velocity (40 Km/h) within the first 2 hours. This clearly indicates that the body is accelerating.

The acceleration can be obtained as followed:

a = (v – u) / t

a = (40 – 0) / 2

a = 20 Km/h²

From the diagram (CDF), we can see that the object velocity changes from 40 to 0 within the last 2 hours. This clearly indicates that the object caming to rest.

v² = u² + 2as

v² = 2as

s = v² / 2a

s = 40² / (2 × 20)

s = 40 Km

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The comparison between the distance traveled by the bullet compared with the distance traveled by the rifle at the same time shows that the bullet travels faster than the rifle due to greater acceleration.

Newtown's third law of motion states that for every action there is a reaction having equal magnitude but opposite direction.

In the case of bullet and rifle, both experience the same amount of force that is equal in magnitude but opposite in direction.

In physics, mass and acceleration have an indirect relation with each other i.e a = F/m. More mass means less acceleration and vice versa.

A rifle has a smaller amount of acceleration than a bullet. It is because the mass of the rifle is greater than the bullet therefore it covers less distance a s compare to a bullet having less mass and greater acceleration and thus travels faster.

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To find the specific heat at constant volume of a gas, you need to measure the change in internal energy of the gas when it is heated at constant volume.

The specific heat at constant volume can then be calculated using the equation:

C_v = ΔU / mΔT

where ,

ΔU is the change in internal energy,

m is the mass of the gas, and

ΔT is the change in temperature.

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This equation relates the speed of the bullet (v) to the masses of the bullet (m) and the wood block (m₂), as well as the height (h) through which the system swings.

To determine the speed of the bullet (v), we can use the principle of conservation of mechanical energy in the system.

Initially, the system has only gravitational potential energy, which is converted into a combination of gravitational potential energy and kinetic energy after the collision. Assuming no energy is lost to other factors like friction or air resistance, we can equate the initial and final energies.

The initial energy is purely potential energy: m₂gh, where m₂ is the mass of the wood block, g is the acceleration due to gravity, and h is the height the system swings through.

The final energy is a combination of potential and kinetic energy: (m + m₂)gh + (1/2)(m + m₂)v², where m is the mass of the bullet and v is its velocity.

Equating the initial and final energies, we can solve for v:

m₂gh = (m + m₂)gh + (1/2)(m + m₂)v².

Simplifying the equation, we find:

v² = 2gh(m₂ - m) / (m + m₂).

Taking the square root of both sides, we get the expression for the speed of the bullet:

v = √[2gh(m₂ - m) / (m + m₂)].

This equation relates the speed of the bullet (v) to the masses of the bullet (m) and the wood block (m₂), as well as the height (h) through which the system swings.

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Answer:

Kinectic

Explanation:

kinetic energy can be regarded as the energy that is been posses by a body as a result of motion, it can be reffered to as work that is required in accelerating a body having a given mass from rest up to a particular velocity. Once this energy is gained during acceleration, the Kinectic energy is maintained by the body unless there is change in speed.

Formula

K.E= 1/2 mv^2

Where m= mass of the object

v= velocity

Therefore, the energy of a semi-truck doing 100 kph on the kighway is a " Kinectic energy"

Answer:

C

Explanation:

Answer:

C. Electric potential difference is the difference in electric potential energy divided by the charge.

Explanation:

edgen correct

Explanation:

if the mass of both of the objects is doubled, then the force of gravity between them is quadrupled; and so on.

The range of wavelengths received by the radio in a car for FM radio frequencies ranging from 88.0 MHz to 108 MHz is approximately between 3.41 meters to 2.78 meters respectively.

To calculate the range of wavelengths received by the radio in a car, we need to use the formula:

λ = c/f

where λ is the wavelength, c is the speed of light (3 x 10^8 m/s), and f is the frequency of the radio wave.

For the low frequency of 88.0 MHz, the wavelength can be calculated as follows:

λ = 3 x 10^8 m/s / 88.0 x 10^6 Hz

λ ≈ 3.41 meters

Therefore, the wavelength for the low frequency of the FM radio is approximately 3.41 meters.

For the high frequency of 108 MHz, the wavelength can be calculated as follows:

λ = 3 x 10^8 m/s / 108 x 10^6 Hz

λ ≈ 2.78 meters

Therefore, the wavelength for the high frequency of the FM radio is approximately 2.78 meters.

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The x-component of the total electric field at point P is approximately 2.5 × 10^6 N/C, and the y-component is zero.

To find the x and y components of the total electric field at point P, we need more information about the distribution of charges or electric field sources around that point. Without specific details, it is not possible to provide a precise answer.

a simple scenario where there is a single point charge at the origin (0,0), we can calculate the electric field at point P using Coulomb's law. Coulomb's law states that the electric field created by a point charge is given by:

E = k * q / r^2

- E is the magnitude of the electric field

- k is the electrostatic constant (approximately equal to 9 × 10^9 N m²/C²)

- q is the charge of the source

- r is the distance between the source and the point where the electric field is being calculated

Let's assume the charge at the origin is q = +1 C and the distance from the origin to point P is r = 6.00 cm = 0.06 m.

Using Coulomb's law, we can calculate the magnitude of the electric field at point P:

E = (9 × 10^9 N m²/C²) * (1 C) / (0.06 m)^2

Simplifying the calculation:

E = 2.5 × 10^6 N/C

Now, if we assume the x-axis is pointing to the right and the y-axis is pointing upward, the electric field at point P would only have an x-component because it lies on the x-axis. The y-component of the electric field would be zero.

Therefore, the x-component of the total electric field at point P is approximately 2.5 × 10^6 N/C, and the y-component is zero.

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1.Beaker A has less thermal energy than Beaker B

2.The water molecules in both beakers A and B have the same average kinetic energy

The temperature of the water in each of two beakers is same (50°C).

Beaker One contains (\(m_{1}\)) 100 g of water

Beaker Two contains (\(m_{2}\)) 250 g of water

Heat gained and lose by the object is depends on mass, change in temperature and specific heat.

Both beakers are made with same materials so their Specific heats and temperature are same .

Beaker B has more mass then Beaker A  so Beaker A has less thermal energy than Beaker B.

2.The water molecules in both beakers A and B have the same average kinetic energy.

The temperature of an object is a measure of its internal energy. Thermal Energy is a form of Kinetic Energy because it is related to the Molecular Velocity.

When Temperature increases the velocity of the molecules ( increases or decreases) and the Kinetic Energy (increases or decreases) as Temperature decreases the velocity of the molecules ( increases or decreases) and the Kinetic Energy (increases or decreases).

so Kinetic Energy Depends on Velocity and Velocity depends on   the Temperature in this problem Temperature are same so The water molecules in both beakers A and B have the same average kinetic energy.

It takes a lot of heat to increase the temperature of liquid water because some of the heat must be used to break hydrogen bonds between the molecules.

In other words, water has a high specific heat capacity, which is defined as the amount of heat needed to raise the temperature of one gram of a substance by one degree Celsius. The amount of heat needed to raise the temperature of 1 g water by 1 °C is has its own name, the calorie.

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Answer:

The correct option is energy levels

Explanation:

Rutherford's model of an atom suggests that an atom has a tiny positively charged central mass (now called the nucleus) which is surrounded by electrons (negatively charged) in a cloud-like manner.

Bohr's model went a bit further than the Rutherford's model in describing an atom by suggesting that the electrons which surrounds in the nucleus travel in fixed circular orbits. This description by Bohr was able to describe the energy levels of orbitals which assumes that smallest orbitals have the lowest energy while the largest orbitals have the highest energy.

Answer:

energy levels

hope this helped!

Explanation:

Answer:

c.

Explanation:

Answer:

20N

Explanation:

newtons 3rd law every action has an equal opposite reaction

I'm not too sure

A sedimentary depositional environment allows organisms to be buried by sediment before "decay, weathering, or scavengers destroy the remains" (D).

Fossilization is a complex process that requires specific conditions to preserve the remains of organisms. When an organism dies, it typically undergoes decay, weathering, and can be scavenged by other organisms. However, in a sedimentary depositional environment, the organism has a higher chance of being protected and preserved.

The sedimentary deposition involves the accumulation of sediment, such as sand, mud, or silt, over time. This sediment can cover and bury the organism before decay, weathering, or scavengers can cause significant damage or complete destruction. The sediment acts as a protective layer, shielding the remains from the elements and preventing rapid decomposition.

Over time, the layers of sediment can undergo compaction and lithification, turning into solid rock. This process helps in the preservation of the organism's remains by providing a stable and durable environment. The minerals present in the sediment can also infiltrate the remains, replacing organic material with minerals and creating a fossil.

In summary, a sedimentary depositional environment offers a better chance for an organism to be fossilized by allowing it to be buried by sediment before decay, weathering, or scavengers can destroy the remains. So, the correct option is D.

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Answer:

I think it is 30km/hr ooh

Astronomers use rotation curves to measure the masses of individual spiral galaxies based on the speed at which stars orbit the galactic center.

The original assumption that all matter interacts with electromagnetic radiation was proven incorrect for the Milky Way galaxy. To further understand the behavior of matter in other galaxies, scientists are now focused on investigating whether this assumption still holds true in different galactic contexts. To accomplish this, they require a method to calculate the masses of individual galaxies and galaxy clusters, which can then be compared with the observed luminous matter.

Astronomers utilize rotation curves as a means to determine the masses of spiral galaxies. These curves provide insights into the speed at which stars orbit around the central region of a galaxy. The underlying principle is that the more mass there is between the stars and the galactic center, the faster the stars will orbit. By analyzing these rotation curves, scientists can estimate the amount of mass present within the galaxy, including both visible matter and potential invisible components such as dark matter.

This approach allows researchers to study the distribution of mass within galaxies and evaluate whether the observed luminous matter alone can account for the gravitational forces that govern the observed motions. By comparing the calculated masses derived from the rotation curves with the masses inferred from the observed luminosity, scientists can gain valuable insights into the existence and properties of dark matter in galaxies.

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Answer:

Mercury is the answer..

Answer:

I believe mercury

Explanation:

The point that supports both the load and the effort is the fulcrum.

A lever is a simple machine that is composed of three parts, the parts of the lever are as follows;

The point that supports both the load and the effort is the fulcrum and it is the point around which a lever rotates and that supports the lever and the load.

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Answer:

The body cells need a continuous supply of oxygen for the metabolic processes that are necessary to maintain life. The respiratory system works with the circulatory system to provide this oxygen and to remove the waste products of metabolism. It also helps to regulate pH of the blood.

Answer:

takes a long time to come, so you get to observe theirs as a science experiment.

Explanation:

The final temperature of the steam (if it is a mixture) can be determined by considering the relevant factors and applying thermodynamic principles.

To determine the final temperature of the steam (if it is a mixture), we need additional information such as the initial temperature, pressure, and composition of the steam.

The final temperature can be obtained by applying the principles of thermodynamics, specifically using the appropriate equations such as the ideal gas law or the steam tables.

These calculations take into account factors like heat transfer, energy conservation, and the specific properties of the steam. It is essential to ensure that the necessary data is available to accurately determine the final temperature.

Understanding the principles of thermodynamics enables us to analyze and predict the changes in temperature, pressure, and other properties of substances and systems.

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Answer:

2.4 secs.

Explanation:

Current (A) = Charge (coulomb)/Time(sec)

We are looking for time. So:

Time (sec) = Charge (coulomb)/Current (A)

↓

12coulombs/5.0A = 2.4 secs

The time period of a 2.00 m long pendulum on the moon where gravity is one-sixth that of the earth is 6.96 s

The Earth's gravity is 9.8 m / s². The moon's gravity is one-sixth that of the earth. The gravity of moon will be,

gm = ge / 6

gm = 9.8 / 6

gm = 1.63 m / s²

T = 2 π √ L / g

T = Time period

L = Length of the pendulum

g = Acceleration due to gravity

L = 2 m

T = 2 * 3.14 √ 2 / 1.63

T = 6.96 s

Therefore, the period of the pendulum is 6.96 s

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When you sit in your desk chair, the reaction force to your weight is the normal force from the chair, which is a true statement. Suppose that a book is sliding against a rough table, then a constant force is needed to maintain its velocity, which is also a true statement.

The normal force is an example of the contact force, which is the force that arises when two objects are in physical contact with each other. It acts perpendicular to the surface of contact and opposes the force of gravity.The force of friction acts against the relative motion of the surfaces in contact, and the net force is the difference between the two opposing forces.

When a book is sliding on a rough table, a force is needed to balance the force of friction acting on it so that its velocity can be maintained at a constant level. The book's velocity decreases over time if the force applied is less than the force of friction on the book. If the force applied is greater than the force of friction on the book, its velocity increases over time. Therefore, a constant force is needed to maintain its velocity

.According to Newton's laws of motion, a body remains at rest or in uniform motion in a straight line unless acted upon by an external force. A constant force is required to maintain uniform motion in the absence of any external force acting on the body.

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Answer:

.3m

Explanation:

Apex

0.3 is right i just got it right on the test for A P E X :D