A rock is thrown straight up and reaches a height of 10m
How long was the rock in the air
What is the initial velocity of the rock

Answer:

( Galileo )discovered evidence to support Copernicus' heliocentric theory when he observed four moons in orbit around Jupiter

Answer:

dmakqkwnwj fddfgdddwsf

The photons that are emitted each second by the transmitting antenna is 1.272 x 10^32  per second.

Photon is an elementary particle that is quantum of the electromagnetic field and also including electromagnetic radiation such as light and radio waves, and the force carrier for the electromagnetic force.

Given, Frequency( ν ) 1000 x 10³ Hz = 1.0 x 10⁶ Hz

So, Energy of one photon = hν ; where  h is plank's constant

= 6.6 x 10⁻³⁴ x 1.0x 10⁶

= 6.6 x 10⁻²⁸ J

Given, Power = 84 x 10³ J/s

As, No of photons emitted = Power / energy of one photon

= 84 x 10³ / 6.6 x 10⁻²⁸

=1.272 x 10^32  per second

Photons emitted each second by the transmitting antenna is 1.272 x 10^32  per second.

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Approximately 1.035 × 10^7 photons will land in the 5.00×10−2-mm-wide strip.

The number of photons landing in the 5.00×10−2-mm-wide strip can be calculated using the formula:

Number of photons = Probability density × Width of the strip × Number of photons passing through

Given:
Probability density = 23.0 m−1
Width of the strip = 5.00×10−2 mm = 5.00×10−5 m
Number of photons passing through = 0.900 × 10^10

First, convert the width of the strip from millimeters to meters:
5.00×10−2 mm = 5.00×10−5 m

Now, substitute the given values into the formula:
Number of photons = 23.0 m−1 × 5.00×10−5 m × 0.900 × 10^10

Next, multiply the probability density and the width of the strip:
23.0 m−1 × 5.00×10−5 m = 1.15×10−3

Now, substitute this result into the formula:
Number of photons = 1.15×10−3 × 0.900 × 10^10

Finally, multiply the result by the number of photons passing through:
Number of photons = 1.15×10−3 × 0.900 × 10^10 = 1.035 × 10^7

Therefore, approximately 1.035 × 10^7 photons will land in the 5.00×10−2-mm-wide strip.

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Answer:

one watt power is defined as power produced when one joule of work is done in one second.

hope it helps

stay safe healthy and happy

Explanation:

The vertical component describes the upward influence of the force upon Fido and the horizontal component describes the rightward influence of the force upon Fido.

Answer:

Velocidad.

Explanation:

Físicamente hablando, la velocidad es la distancia recorrida por unidad de tiempo. En el caso de las ondas se trata de la distancia recorrida en un período de tiempo.

Por ende, la opción correcta es: Velocidad.

Answer:

20100s

Explanation:

Answer:

..

Explanation:

Coordinate adjectives are adjectives that describe the same noun equally. They should be separated with commas. In this sentence, both red and round are describing the ball. The correct answer is, "The red, round ball is Adley's favorite toy to play with."

The efficiency values that is reasonable If you want to design a high efficiency wind turbine is 45%

The efficiency of a wind turbine is the ratio of the power it generates to the power in the wind.

The theoretical maximum efficiency of a wind turbine is the Betz limit, which is 59.3%.

However, in practice, wind turbines are typically only about 35%- 45% efficient.

There are a number of factors that can affect the efficiency of a wind turbine, including the size of the turbine, the wind speed, and the design of the turbine.

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The statement that is most true concerning the current through each resistor and the voltage measured across each resistor is the current is the same through both resistors, and so is the voltage across both resistors.

The equivаlent resistаnce of а combinаtion of resistors depends on both their individuаl vаlues аnd how they аre connected. The simplest combinаtions of resistors аre series аnd pаrаllel connections. In а series circuit, the output current of the first resistor flows into the input of the second resistor; therefore, the current is the sаme in eаch resistor.

In а pаrаllel circuit, аll of the resistor leаds on one side of the resistors аre connected together аnd аll the leаds on the other side аre connected together. In the cаse of а pаrаllel configurаtion, eаch resistor hаs the sаme potentiаl drop аcross it, аnd the currents through eаch resistor mаy be different, depending on the resistor. The sum of the individuаl currents equаls the current thаt flows into the pаrаllel connections.

Your question is incomplete, but most probably your full question can be seen in the Attachment.

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Speed or Velocity is the distance at which a person or object is moving per time.

The car with the highest average velocity is Car B

It would take Car A 7.33 hours to travel the same distance as Car B

We would solve the question in two parts.

Part A

The formula used to calculate the average velocity is :

Distance (km) / Time (hr)

Average velocity for Car A = 1200 km/8 hr

= 150 km/hr

Average velocity for Car B = 1100 km/ 6.5 hr

= 169.23 km/hr

Average velocity for Car C  = 1300 km/ 8.3 hr

= 156.63 km/hr.

Therefore, the car with the highest average velocity is Car B

Part B

How long would it have taken the slowest car to travel the same distance as the fastest car?

The slowest car is Car A with an average velocity of 150 km/hr

The time it would take for Car A to drive the same distance as Car B is calculated using the formula

Time = Distance of Car B/ Average velocity of Car A

Distance of Car B = 1100 km

Average velocity of Car A = 150 km/ hr

Time = 1100km / 150 km/hr

= 7.33 hours

Therefore, it would take Car A 7.33 hours to travel the same distance as Car B

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B. Piron > Pwater > Pwax

Wax normally floats in water,it is less dense than water.

Iron is more dense than water, so it sinks.

Answer:

B.    P iron >  P water > P wax

Answer:

La magnitud de la velocidad con la que Mjonir golpea el suelo es 93.2 m/s.

Explanation:

Podemos encontrar la velocidad con la que el martillo golpea el suelo usando la siguiente ecuación:

\( v_{f} = v_{0} - gt \)   (1)

En donde:

\( v_{f}\): es la velocidad final =?

\( v_{0}\): es la velocidad inicial = 0 (lo deja caer)

g: es la gravedad = 9.81 m/s²

t: es el tiempo = 9.5 s

Al reemplazar los valores anteriores en la ecuación (1), tenemos:

\( v_{f} = 0 - 9.81 m/s^{2}*9.5 s = -93.2 m/s \)                

El signo negativo se debe a que el vector velocidad está dirigido hacia abajo en el eje vertical (y).

Por lo tanto, la magnitud de la velocidad con la que Mjonir golpea el suelo es 93.2 m/s.

Espero que te sea de utilidad!

To count the number of valence electrons, you need to determine the group number of the element in the periodic table and sum up the valence electrons for all atoms in the molecule or ion.

The Lewis structure is a representation of the molecule or ion, showing the arrangement of atoms and valence electrons. The central atom is usually the least electronegative element or the one with the highest valence. To determine the electron geometry, you consider the arrangement of electron groups (bonded and lone pairs) around the central atom using the VSEPR theory.

Counting the number of valence electrons: Look at the periodic table and find the group number of each element in the molecule or ion. The group number represents the number of valence electrons. For example, carbon (Group 14) has 4 valence electrons, oxygen (Group 16) has 6 valence electrons, etc. Sum up the valence electrons for all atoms to get the total number of valence electrons.

Drawing the Lewis structure: The Lewis structure is a visual representation of a molecule or ion that shows the arrangement of atoms and valence electrons. Start by connecting the atoms with single bonds. Distribute the remaining valence electrons as lone pairs around the atoms, following the octet rule (except for hydrogen, which only needs 2 electrons). Aim to minimize formal charges and achieve stability.

Determining the central atom: The central atom is usually the least electronegative element or the one with the highest valence. Carbon is often a central atom, but other elements like nitrogen or oxygen can also be central depending on the molecule or ion.

Determining the electron geometry: To determine the electron geometry, use the Valence Shell Electron Pair Repulsion (VSEPR) theory. Count the total number of electron groups around the central atom. Electron groups can be bonded pairs (atoms connected by single, double, or triple bonds) or lone pairs.

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Answer:

Con Agra and Sare Lee

Explanation:

Answer:

television

Explanation:

a television refracts light (the light bounces off of the screen

Answer:

Suppose you have a glass slab as a paper weight, if you keep it on the paper, dont you see something strange? The paper becomes elevated in the glase slab. Everyone sees a waterbottle or glass everyday, while seeing through it, does everything seem normal? Nope. That's refraction.

Explanation:

You must have seen a prism, right? It makes light split into the visible electromagnetic spectrum.

As an astronaut meal planner, here is a menu for a day's worth of meals in space includes Breakfast, Lunch and Dinner.

Breakfast:

Scrambled Eggs with Vegetables

Special Packaging: Individual vacuum-sealed pouches

Preparation: The scrambled eggs with vegetables will be precooked and dehydrated. Astronauts will rehydrate the meal with hot water, stir, and allow it to sit for a few minutes before consuming. This ensures the eggs and vegetables rehydrate properly in the zero-gravity environment.

Lunch:

Teriyaki Chicken Stir-Fry with Rice

Special Packaging: Sealed pouches for each component (chicken, vegetables, rice, and sauce)

Preparation: The chicken, vegetables, and rice will be precooked and dehydrated separately. The teriyaki sauce will be in a separate pouch. Astronauts will rehydrate each component individually with hot water, then mix them together in a resealable pouch. After a few minutes, the meal will be ready to eat.

Dinner:

Grilled Salmon with Quinoa and Roasted Vegetables

Special Packaging: Vacuum-sealed pouches for each component

Preparation: The salmon will be cooked and then freeze-dried for preservation. The quinoa and roasted vegetables will be precooked and dehydrated separately. Astronauts will rehydrate the quinoa and vegetables with hot water, then warm up the salmon using a food warmer. The components will be combined on a tray and secured with fasteners to prevent them from floating away.

Modifications for space include using dehydration and freeze-drying techniques to remove water content from the food while preserving nutrients. Vacuum-sealed and sealed pouches are used to prevent spoilage and maintain freshness. Rehydration with hot water is necessary to restore the food's texture and taste.

Additionally, it's important to consider portion control and individual packaging to prevent cross-contamination and maintain food safety. The use of condiments and seasonings may be limited to avoid loose particles floating in the spacecraft.

By designing meals that are easy to prepare, consume, and clean up, astronauts can enjoy nutritious and satisfying meals while adapting to the unique challenges of the zero-gravity and non-refrigerated environment in space.

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The block now gains as it moves a distance of 3 m the Kinetic Energy is 27Nm.  

15N-6N=9N

3m x 9N=27Nm

In physics, the kinetic energy of an item is the strength that it possesses due to its movement. Its miles described because the work had to boost up a frame of a given mass from rest to its said speed. Having gained this energy for the duration of its acceleration, the body maintains this kinetic electricity unless its speed changes. An equal quantity of Work is done through the frame when decelerating from its present-day pace to a kingdom of rest. officially, kinetic power is any term in a device's Lagrange which includes a derivative with appreciation to time.

In classical mechanics, the kinetic energy of a non-rotating object of mass m journeying at a pace v is 1/2 mv². In relativistic mechanics, this is a good approximation only when v is a great deal much less than the speed of light. the same old unit of kinetic energy is the joule, while the English unit of kinetic electricity is the foot-pound.

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The radioactive decay equation for thorium-232 is \(Th^{232} - > Ra^{228} + He^{4}\). To find the radioactive radiation activity of 10 g of thorium, calculate the number of nuclei using Avogadro's number and the decay constant. For the activity after 10 years, use the radioactive decay law with the appropriate values.

a) The radioactive decay equation for thorium-232 (\(Th^{232}\)) can be written as follows:

\(Th^{232} - > Ra^{228} + He^{4}\)

In this equation, thorium-232 undergoes alpha decay, transforming into radium-228 and emitting an alpha particle (helium-4 nucleus).

b) To find the radioactive radiation activity of 10 g of thorium, we need to calculate the number of thorium-232 nuclei in the given sample. First, we find the number of moles of thorium-232 by dividing the mass of the sample by its molar mass. The molar mass of thorium-232 is approximately 232 g/mol. Thus, the number of moles is:

Number of moles = 10 g / 232 g/mol

Next, we calculate the number of thorium-232 nuclei using Avogadro's number, which is approximately 6.022 × \(10^{23}\) nuclei/mol:

Number of nuclei = Number of moles × Avogadro's number

Finally, we determine the radioactive radiation activity (A) by multiplying the number of nuclei by the decay constant (λ). The decay constant (λ) is related to the half-life (T1/2) of thorium-232 through the equation:

λ = ln(2) / T1/2

The decay constant represents the probability of decay per unit time. Therefore, the activity can be calculated as:

Activity = λ × Number of nuclei

c) To find the activity after 10 years, we use the radioactive decay law, which states that the activity of a radioactive substance decreases exponentially with time. The remaining activity (A_t) after a given time (t) is given by the equation:

\(A_t = A_0 * (1/2)^{t/T1/2}\)

Where A_0 is the initial activity at t = 0. Substituting the initial activity calculated in part b, the decay constant, and the desired time of 10 years, we can determine the activity after 10 years.

In summary, the radioactive decay equation for thorium-232 is \(Th^{232} - > Ra^{228} + He^{4}\) . To find the radioactive radiation activity of 10 g of thorium, calculate the number of nuclei and multiply it by the decay constant. For the activity after 10 years, use the radioactive decay law and substitute the appropriate values.

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The false statements about the force and acceleration of the car are statements 1, 2, 3, 4, and 6.

1. The net force on the car is zero: False.

The net force on the car is not zero since it is constantly accelerating due to the centripetal force. This force points inward towards the center of the circular track and is provided by the friction between the tires and the track.

2. Both the acceleration and the net force point outward: False.

The acceleration is inward and the net force is inward. This is due to the centripetal force which is pointing inward toward the center of the track.

3. Both the acceleration and the net force on the ground point inward: False.

The acceleration is pointing inward due to the centripetal force, while the net force is pointing outward due to the static friction between the ground and the tires.

4. If there is no friction, the acceleration is outward: False.

The acceleration is always inward due to the centripetal force, even if there is no friction.

5. The net force acting on the car is inversely proportional to the radius of the track: True.

As the radius of the track increases, the net force acting on the car decreases.

6. The car's acceleration is zero: False.

The car's acceleration is not zero, it is constantly accelerating due to the centripetal force.

In conclusion, all of the statements are false except for the fifth statement.

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Given data

*The half-life of iodine-131 is t = 8.07 days

*The amount of quantity left is N = 0.25 g

*The number of days is T = 40.35 days

The expression for the radioactivity decay is given as

Substitute the values in the above expression as

Answer:

See below

Explanation:

40.35 days / (8.07 day per half life) = 5 half lives

.25 = x ( 1/2)^5

.25 / ( 1/2)^5 = x = 8 gm originally

The distance traveled is equal to the difference between the final velocity upsilon_{2} and the initial velocity v1.

The distance traveled by the particle when it reaches velocity upsilon_{2} can be determined by integrating the acceleration with respect to time.

Given that dv / dt = cv, we can rewrite this as dv = cv dt.

Integrating both sides, we have ∫dv = ∫cv dt.

The left side of the equation becomes v - v1, since v1 is the initial velocity of the particle.

On the right side, we integrate cv dt with respect to t. The integral of cv is (c/2)t^2.

Thus, the equation becomes v - v1 = (c/2)t^2.

Now, we can solve for the time t when the velocity of the particle reaches upsilon_{2}.

Substituting upsilon_{2} for v and rearranging the equation, we have t = sqrt((2(upsilon_{2} - v1))/c).

Once we have the value of t, we can substitute it back into the equation v - v1 = (c/2)t^2 to calculate the distance traveled.

Therefore, the distance traveled by the particle when it reaches velocity upsilon_{2} is given by (c/2)(sqrt((2(upsilon_{2} - v1))/c))^2.

This simplifies to c(upsilon_{2} - v1)/c = upsilon_{2} - v1.

So, the distance traveled is equal to the difference between the final velocity upsilon_{2} and the initial velocity v1.

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When a given molecule absorbs a photon of microwave radiation, its rotational energy state changes.

The absorption of a microwave photon by a molecule causes a change in its rotational energy state. The rotation of a molecule occurs about its center of mass, which is referred to as its rotational energy. When a molecule absorbs microwave radiation, it acquires energy that causes it to transition to a higher rotational energy state.

The absorption of a microwave photon results in an increase in the energy of the molecule, which causes it to spin faster around its axis. In order to make this change, the molecule must first absorb the radiation's energy.

As a result, microwave radiation is often used to investigate molecular structures because it can induce transitions between different rotational energy levels of a molecule.

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Answer:

Distance, Mass

Answer:

Temperature is not a measure of the total kinetic energy of all the molecules in a substance. Two liters of boiling water have twice as much kinetic energy as one liter. The temperatures are the same because the average kinetic energy of molecules in each is the same.

Answer:

2000 m/s

Explanation:

The speed of a wave is it's frequency * wavelength. In this case, the frequency is 0.25 Hz (waves per second) and the wavelength is 8000m. So the speed of the wave will be 0.25Hz * 8000m which is 2000 meters per second.

A tsunami when hits north California, its speed will be 2000m/s.

The tsunami caused by the movement of tectonic plates at the sea or ocean floor or due to large volcanic activities . These are high energy waves that can destroy everything.

Speed was the pace as well as the direction of an object's movement, whereas speed would be the time rate whereby an object is traveling along a path. In other words, velocity is just a vector, whereas speed would be a scalar value.

In the question, given data is ,

frequency (n) = 0.25 Hz.

Wavelength (λ) = 8000msince

speed of wave  (v) = n.λ

on putting values.    

v = 0.25×8000 =2000m/s

Hence, the speed of the wave is 2000m/s.

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Answer:

Explanation:

The direction of the applied force has to be parallel to the distance an object moved in order to say that work has been done.