Find the acceleration of the block.

You've got some UHF radio waves at the long end of that range.  But most of the range consists of microwaves.

For example:  In the US, the "microwave oven" kitchen appliance cooks with radiation at a wavelength of about 12.2 cm .  

Answer:

B protons

Explanation:

- The atomic number of a nucleus (often labelled with Z) is the number of protons inside the nucleus

- The mass number of a nucleus (often labelled with A) is the sum of the protons and the neutrons inside the nucleus

- The number of electrons in a neutral atom is equal to the number of protons inside the nucleus

Therefore, the correct answer is

B protons

However, A (electrons) could also be considered correct if we are talking about a neutral atom.

Answer:

B. Earth rotates on its axis and orbits the sun.

Explanation:

The model given by Ptolemy was a geocentric model. It described Earth as the center of the universe and remains stationary on its axis.

Copernicus gave a heliocentric model. The sun is at the center of the solar system and Earth revolves around the sun as well as rotates on its axis.

Thus, the correct option is B.

Copernicus's heliocentric model places the Sun at the center with Earth rotating on its axis and orbiting the Sun. This is in contrast to Ptolemy's geocentric model where Earth is at the center.

Nicolaus Copernicus's model of the universe is known as the heliocentric model, which is different from Ptolemy's geocentric model. Copernicus suggested in 1543 that the Sun is at the center of the universe, and Earth, along with the other planets, orbits around it. This model was more straightforward and accurate compared to the Ptolemaic system, which had Earth at the center and required complex mechanisms like epicycles and deferents to describe planetary motions. The correct statement regarding Copernicus's belief is B. Earth rotates on its axis and orbits the sun.

Answer:

[tex]6.67\cdot 10^{-3} N[/tex]

Explanation:

The gravitational force between two objects is given by

[tex]F=G\frac{m_1 m_2}{r^2}[/tex]

where

G is the gravitational constant

m1, m2 are the two masses

r is the separation between the two masses

In this problem, we have

[tex]m_1 = m_2 = 2.0 \cdot 10^4 kg[/tex] the mass of each truck

r = 2.0 m is their separation

Substituting,

[tex]F=(6.67\cdot 10^{-11}) \frac{(2.0\cdot 10^4 kg)^2}{(2.0 m)^2}=6.67\cdot 10^{-3} N[/tex]

The gravitational force between the two trucks is calculated using Newton's Universal Law of Gravitation. The force is very small due to the relatively small masses of the trucks compared to large bodies like the Earth.

The gravitational force between the two trucks can be calculated using Newton's Universal Law of Gravitation. This law is given in the form F = G * (M1 * M2) / R², where F is the gravitational force, G is the gravitational constant (6.67 × 10^-11 Nm²/kg²), M1 and M2 are the masses of the two bodies in kilograms, and R is their separation in meters.

For the two trucks, the equation can be applied as follows: F = 6.67 × 10^-11 Nm²/kg² * ((2.0x10^4 kg) * (2.0x10^4 kg)) / (2.0 m)². This gives us the gravitational force that the two trucks exert on each other.

It is worth noting that while the gravitational forces between such small bodies are noticeable, they are extremely small. This is consistent with our everyday experience that we do not feel the gravitational force of other nearby objects, but only the force exerted by the Earth, which is of a much larger mass.

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Hi!

So if you drop a basketball from a higher height, it has more time to gather more energy, which it then forces against the ground and causes the ball to bounce.

Hope this helps! Sorry I didn't really use any technical terms!

The basketball do not bounce back to the same height after each drop due to the fact of loss of kinetic energy.

Explanation:

When the basketball or any ball is dropped off from a certain height it falls down under the influence of gravity with the kinetic energy which has been transferred to the ball with hand by dribble.

When the basketball hits the ground with the kinetic energy, it loses some of the energy to the ground and then with the action reaction pair with the ground, is bounced back but with lower energy to a lower height.

Answer:

Explanation:

12 + 22 + 11 = 45

There are 45 atoms, and there are three elements: C, H, and O.

In an exothermic chemical reaction, energy is stored in the bonds of reactants before the reaction. It's higher than the energy of the products, hence when the reaction takes place, energy is released typically as heat.

In a typical exothermic chemical reaction, energy is stored in the chemical bonds of the reactants before the reaction. This energy is higher than that of the product molecules which arise after the reaction. When the reaction takes place, the stored energy is released as heat. This is why the reaction is called 'exothermic', as 'exo' means 'out' and 'thermic' means 'heat'.

An example of an exothermic reaction is the burning of natural gas. In this process, natural gas (methane) reacts with oxygen and release a large amount of energy as heat and light. So, in simple terms prior to an exothermic reaction, the reactants possess a relatively larger potential energy as compared to the products.

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Answer:

The plane’s acceleration from A to B is

[tex]a =83.33\ m/s^2[/tex]

Explanation:

The acceleration of an object is a measure of how its speed changes over time.

In this case, we know that the plane initially has a velocity of 5000 m/s when it passes through point A, and when it passes through point B, 60 seconds later it has a velocity of 10,000 m/s.

Then the average acceleration is calculated as

[tex]a =\frac{s_2-s_1}{t_2-t_1}[/tex]

Where

[tex]s_2 = 10 000[/tex] is the final speed

[tex]s_1=5000[/tex] is the initial velocity

[tex]t_2 -t_1=60[/tex] is the time it took for the object to reach the final speed

Then

[tex]a =\frac{10000-5000}{60}[/tex]

[tex]a =\frac{5000}{60}[/tex]

[tex]a =83.33\ m/s^2[/tex]

Answer:

Send a pic of it so i can mark it.

Explanation:

Answer:

980 J

Explanation:

The change in box's energy is equal to its change in gravitational potential energy:

[tex]\Delta U = m g \Delta h[/tex]

where

m = 50 kg is the mass of the box

g = 9.8 m/s^2 is the acceleration due to gravity

[tex]\Delta h= 2m[/tex] is the change in height of the box

Substituting numbers, we find

[tex]\Delta U = (50 kg)(9.8 m/s^2)(2 m)=980 J[/tex]

Answer:

This is late, but your answer would be 1,000 J

Explanation:

How I got my answer was I used the Gravitational Potential Energy Calculator on the calculator soup. the answer I got when I plugged 50 and 2 into the calculator is 980, but since it's not on the list of choices, I went with the closest one, 1,000 J

I got it correct on my test; here is the proof

Answer:

1) A, C, and D

2) D

Explanation:

1)  In ice, for instance, the temperature decreases to become a solid, so B does not apply.

2) In most plasma's, the atoms don't collide into each other.

Answer:1 C

2 A

Explanation:

Liquids tend to gain more kinetic energy than solids. Energy is related with temperature. As the kinetic energy is increased so also is the temperature. This increase in temperature reduces the intermolecular attraction in solids.

Plasma comprise of positively Charged and negatively charged particles and occurs when the atoms in a gas becomes ionized.

Hello!

There are actually four states of matter. The three main ones are solids, liquids and gasses. The fourth one is called plasma.

Solids have a definite shape and volume.

Liquids have a definite volume but not shape.

Gas doesn’t have a definite volume or shape.

Plasma is like gas but made of electricity charged particles and very hot.

Answer:

Transverse wave- Back and forth at right angles to the direction of the wave arrow.

longitudinal wave- bask and forth in the direction of the motion of the motion of the wave.

electromagnetic wave- two alternating waves moving at right angles to each other.

Explanation:

In a longitudinal wave, the particles vibrate at right angles in reference to the wave motion.

In a transverse wave, the particles vibrate parallel to the wave motion

Electromagnetic waves occur as a result of the interaction between two  waves and are normally transverse in nature.  

Answer:

Transverse wave ---> back and forth at right angles to the direction of the motion of the wave.

Electromagnetic wave ----> two alternating waves moving at right angles to each other.

Longitudinal wave ----> back and forth in the direction of the motion of the wave.

Explanation:

Answer:

B. Inelastic collision

Explanation:

There are two types of collision:

- Elastic collision: in an elastic collision, both the total momentum of the objects and the total kinetic energy of the objects involved are conserved before and after the collision

- Inelastic collision: in an inelastic collision, the total momentum of the objects is conserved before and after the collision, while the total kinetic energy is not - in fact, some of the kinetic energy is converted into other forms of energy (such as thermal energy) due to the presence of frictional forces

In particular, a perfectly inelastic collision is an inelastic collision in which the two objects stick together after the collision: in such a situation, the amount of kinetic energy "lost" (=converted into other forms) is maximum.

In the situation described in the problem, the two skaters stick together after the collision, so this is an example of perfectly inelastic collision.

Answer:

Decrease concentration decrease reaction rate.

Decrease surface area increase reaction rate

Answer:

0.75 Amps

Explanation:

I had this question and this was right

Answer:

Current, I = 0.75 amps

Explanation:

Given that

Supplied voltage, V = 1.5 volts

Value of resistor, R = 2 ohms

Ohm's law to used to determine the current in the circuit. Mathematically, it is given by :

V = I R

I = current flowing in the circuit

[tex]I=\dfrac{V}{R}[/tex]

[tex]I=\dfrac{1.5\ V}{2\ ohms}[/tex]

I = 0.75 amps

So, the current flowing in the circuit is 0.75 amps. Hence, the correct option is (b) ''0.75 amps''.

Hello! :)

C) heat from the sun

Why?

Because the sun’s heat makes the water turn to steam—or what we call “water vapor.”

Hope this helped and I hope I answered in time!

Good luck!

~ Destiny ^_^

Answer: C

Heat From the Sun

How Do I Know?

SCIENCE

Answer: A device that uses infrared sensors.

Explanation:

Answer:

a device that uses infrared sensors to create pictures that show variations in temperature

Explanation:

Gradpoint

Answer:

Frequency

Explanation:

Answer:

Frequency

Explanation:

The answer is A.68 degrees

i think its (a) too.

Answer:

It has one proton instead of a neutron (beta-minus decay) or a neutron instead of a proton (beta-plus decay)

Explanation:

- In a beta-minus decay, a neutron in the nucleus turns into a proton, emitting an electron and an anti-neutrino:

[tex]n \rightarrow p + e^- + \bar{\nu}[/tex]

In this process, therefore, the final nucleus will have a proton instead of a neutron. This means that the atomic number Z (number of protons) will increase by one, while the mass number A (number of protons+neutrons) will remain the same.

- In a beta-plus decay, a proton in the nucleus turns into a neutron, emitting a positron and a neutrino:

[tex]p \rightarrow n + e^+ + \nu[/tex]

In this process, therefore, the final nucleus will have a neutron instead of a proton. This means that the atomic number Z (number of protons) will decrease by one, while the mass number A (number of protons+neutrons) will remain the same.

Answer:

2020 days

Explanation:

The half life equation is:

A = A₀ (½)^(t / T)

where A is the final amount, A₀ is the initial amount, t is the amount of time, and T is the half life.

Here, A = 1.25 mg, A₀ = 2.50 mg, and T = 2020 days.

1.25 = 2.50 (½)^(t / 2020)

0.5 = ½^(t / 2020)

1 = t / 2020

t = 2020

It takes 2020 days.

The time required before a 2.50-mg sample of 146 61 pm is reduced to 1.25mg is 2020 days.

Half life is the time taken  by a radioactive material for the radioactivity of  to reduce by half its original value.

The half life equation is:

A = A₀ (½)^(t / T)

where A is the final amount, A₀ is the initial amount, t is the amount of time, and T is the half life.

Given is the value of A = 1.25 mg, A₀ = 2.50 mg, and T = 2020 days.

1.25 = 2.50 (½)^(t / 2020)

0.5 = ½^(t / 2020)

1 = t / 2020

t = 2020

Thus, time taken is 2020 days.

Learn more about half life.

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Answer:

In most materials, as heat energy is absorbed, the density decreases. IF a certain object is heated, it might appear bigger than usual because it expands as the molecules inside moves faster than usual. However the mass of it stays the same while the density decreases.

Answer:

E= 2 J

Explanation:

For this case we see how the mechanical energy is generated by the potential energy due to the change of position. We can express that as

E=m*g*h

Being "m" the mass of the object, "g" the value of the acceleration by gravity and "h" the distance traveled in the movement. So

E=m*g*h=0.8Kg*10m/s2*(0.75-0.5)=2J

Done

A. 237 N. The force of kinetic friction acting on him as he slides across the floor is Fk ≅ 237 N.

The equation of the force of kinetic friction is given by Fk = μk*N, where n = m*g. We know that the coefficient of kinetic friction between Gary's shoes and the wet kitchen floor is μk = 0.21, and Gary has a mass of 115kg. Substituting the values:

Fk = μk*n

Fk = (0.21)(115kg*9.8m/s²)

Fk = 236.67 N

Fk≅ 237 N

Answer:

237 N

Explanation:

A P E X

Answer:

Explanation:

If it moves, the object has KE. The formula for KE is

KE = 1/2 mv^2

In order to have a measurable KE, you only need the object to have a mass (m) and a speed(v). If it has those two things, it has KE.

Answer:

That the Sun was the center of the universe.

Explanation:

Ptolemy believed in geocentrism, which means that the Earth is the center of the Universe. This was also supported by Aristotle. Copernicus on the other hand believed in a heliocentric system, which proposes that the sun is the center of the universe.

Answer:

Earth rotates on its axis and orbits the sun.

Explanation:

Ptolemy believed earth is stationary and is located at the center of the universe. Every celestial object moves around the earth.

It was easier to assume that the earth is not moving since it appears to be stationary to people dwelling on it and to assume that the celestial objects are actually rotating the earth since they appear to be moving.

This is the perfect example that looks can be deceiving. In the ancient times the circle is believed to be a divine shape since it is perfect and the two major celestial objects, the sun and the moon, moves in a circular path. But it turns out, not everything rotates the earth in circular orbit. So Ptolemy proposed nested circular orbits. Which was so complex and farfetched.

Copernicus, a student of Tycho Brahe, (remember Tycho Brahe is an advocate of geocentric theory) inherited Tycho brahe's records of the movements of mars. He could not explain the retrograde motion of mars within the limits of geocentric theory.

He then suggested to remove the concept of divinity, associated with the earth being the center of all universe and to treat earth like every other celestial object. He was the first ever radical who steered us on the right path. In his heliocentric theory, earth rotates on its axis and orbits the sun. This can explain the retrograde motion of mars very easily

Answer:

if i were you i would try to do the work because if you let someone else you wont be able to understand the question

Hello There!

Where is fluid pressure greatest? "2 meters below the surface of a swimming pool."

#13 "the weight of the fluid displaced by the object"

#14 25 N•m

#15 "5"

Answer:

C

Explanation:

This is because glass (2400 kg/m^3) is denser than water (1000 kg/m^3).  Water has a refractive index of water is 1.33 while that of glass is 1.54.  This means that because the light is traveling from a medium of lower to higher refractive index, it will slow down and most of it will be reflected back into the water medium.

Answer: D

Explanation: just took the test