Find the velocity of a dropped brick after 5.0 s using v =a ∆ t and a = - 9.8 m/s^2

Air Conditioner.

Washing Machine.

Refrigerator.

Induction Stove.

Vacuum Cleaner.

Camera

Microwave Oven.

Water Purifier

Answer:

The force is  \(F = 200 \ N\)

Explanation:

From the question we are told that

     The amount of energy required is \(E = 3000 \ J\)

      The time available  is  \(t = 10 \ minutes = 600 \ s\)

      The length of ramp  is  \(l = 15 \ m\)

Generally the workdone in moving the object is mathematically represented as

           \(W = E = F * l\)

=>        \(3000 = F* 15\)

=>         \(F = 200 \ N\)    

Answer:

True

Explanation:

Generally speaking, we say that light travels in waves, and all electromagnetic radiation travels at the same speed which is about 3.0 * 108 meters per second through a vacuum.

Answer:

absolutely true

Explanation:

as it travels in a speed of 30×108 m per second

(a) The period of a wheel can be found by dividing the time it takes for each revolution by the number of revolutions per period.

(b) The angular speed of the wheel in rad/s can be determined by dividing 2π (the full angle in radians) by the period.

(a) To find the period of the wheel, we divide the time it takes for each revolution (2.25 s) by the number of revolutions per period. Since the wheel completes one revolution per period, the period is equal to the time per revolution. Therefore, the period of the wheel is 2.25 s.

(b) The angular speed of the wheel can be calculated by dividing the full angle in radians (2π) by the period. Since the wheel completes one revolution per period, the angle traversed is 2π radians. Dividing 2π by the period of 2.25 s gives us the angular speed of the wheel in rad/s. Thus, the angular speed of the wheel is approximately 2.79 rad/s.

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If current did not flow in the circuit, it simply implies that the material is an insulator.

An insulator is a material that does not conduct electricity. A circuit is a  path  that is provided for the flow of current.

If this material was connected into a complete circuit yet current did not flow in the circuit, it simply implies that the material is an insulator.

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A real image is formed when rays of light converge at a specific point, creating an actual image that can be captured on a screen or surface.

A real image is created when light rays intersect at a particular point after passing through an object. This convergence of rays allows the formation of an actual image that can be captured on a screen or surface. The key characteristic of a real image is that it can be projected onto a screen and appears inverted compared to the object being imaged.

To understand the formation of a real image, we need to consider the behaviour of light rays. When light passes through an object, it undergoes refraction, causing the rays to change direction. These refracted rays converge at a specific point, known as the focal point, before diverging again. At the focal point, the rays intersect and form a real image.

The real image can be observed by placing a screen or surface at the position where the converging rays meet. The image appears inverted because the rays cross each other. This phenomenon is commonly observed in optical systems such as cameras, where the lens focuses incoming light onto a photosensitive surface, forming a real image that can be captured and recorded.

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Answer:

Car D

Explanation:

Answer:

The corect answer is car D hope this helped (:

Explanation:

An engine moves a boat through the water at a constant speed of 15 m/s. The engine must exert a force of 6.0 kN to balance the force that the water exerts against the hull. Power is the measure of how fast work can be done. The unit of power is watts (W), which can be defined as the amount of work done in one second.

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When you push a pencil off your desk, the energy transformation that takes place is that potential energy transforms into kinetic energy.

The correct answer to the given question is option C.

Potential energy is the energy stored within an object because of its position or configuration.

In this scenario, the pencil has potential energy because of its elevated position on the desk. When the pencil is pushed off the desk, it begins to move, which means that it has kinetic energy. Kinetic energy is the energy of motion.

As the pencil falls off the desk, its potential energy is transformed into kinetic energy, which is the energy that results from its motion. The faster the pencil falls, the greater its kinetic energy will be because kinetic energy is directly proportional to the square of an object's velocity.

Therefore, when you push a pencil off your desk, the potential energy that it has because of its elevated position is transformed into kinetic energy as it falls towards the ground.

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Answer:

Ratio of wire 2 to wire 1 is 0.5 : 1

Explanation:

Wire 1:

length = L

radius = r

Wire 2:

length = 2L

radius = 2r

Resistance of a conductor varies directly as the length and inversely as the cross sectional area. Mathematically

\(R = \frac{pl}{a}\)

l = length of conductor

a = cross sectional area of the conductor

p = resistivity of the material with which the conductor is made.

since we are considering the same material, we can ignore the resistivity of the wire.

For wire 1

cross sectional area = \(\pi r^{2}\)

therefore,

resistance R = \(\frac{L}{\pi r^{2} }\)

For the second wire 2

cross sectional area = \(4\pi r^{2}\)

therefore,

resistance R = \(\frac{2L}{4\pi r^{2} }\)

Ratio of wire 2 to wire 1 will be

\(\frac{2L}{4\pi r^{2} }\) ÷ \(\frac{L}{\pi r^{2} }\) = \(\frac{2L}{4\pi r^{2} }\) x \(\frac{\pi r^{2} }{L}\)

Ratio of resistance of wire 2 to wire 1 = 2/4 = 0.5 : 1

About 1,360 watts per square meter

At Earth's average distance from the Sun (about 150 million kilometers), the average intensity of solar energy reaching the top of the atmosphere directly facing the Sun is about 1,360 watts per square meter, according to measurements made by the most recent NASA satellite missions.

The radio lobes that flank some radio galaxies mainly produce b. synchrotron radiation.

Synchrotron radiation is generated when charged particles, such as electrons, are accelerated in a magnetic field. In radio galaxies, these charged particles are ejected from the central active galactic nucleus (AGN) and travel through the intergalactic medium, interacting with magnetic fields and creating the radio lobes.

This type of radiation is different from 21-cm radiation, black body radiation, and emission or absorption lines due to hydrogen. 21-cm radiation refers to a specific wavelength emitted by neutral hydrogen atoms, while black body radiation is emitted by objects based on their temperature. Emission and absorption lines are spectral features associated with the presence of specific elements in a light source or along the line of sight.

Overall, the synchrotron radiation produced by radio lobes is an important characteristic of radio galaxies, providing insights into the mechanisms occurring within these cosmic structures. Hence, b is the correct option.

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Answer:

9896

Explanation:

multiply them all together

Answer:

b

Explanation:

The Coriolis effect is a condition which causes a hurricane to rotate in a particular direction. Thus, the correct option is B.

Hurricanes are the enormous storms which come with a rotating wind speed of about 74 miles per hour. The rotating wind that swirls across the warm water of the tropics and also comes with a terrifying force.

The Coriolis force is an inertial or the fictitious force, which acts on the objects which are in motion within a frame of reference that rotates them with respect to an inertial frame. In a reference frame, with the clockwise rotation, the force acts to the left of the motion of the object. Whereas, in one with anticlockwise or counterclockwise rotation, the force acts to the right of the object. The deflection of an object due to this Coriolis force is called as the Coriolis effect.

Therefore, the correct option is B.

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The answer is E. One-ninth as bright as star B if two star are of equal luminosity.

The apparent brightness of a star depends on its distance from the observer. According to the inverse square law, the apparent brightness of a star decreases as the square of the distance from the observer increases. In this case, star A is three times farther away from the observer than star B. Therefore, the apparent brightness of star A will be nine times less than that of star B.

Since the two stars are of equal luminosity, we can conclude that star A appears one-ninth as bright as star B. This is because the apparent brightness of a star is proportional to its luminosity divided by the square of the distance from the observer. Since the two stars have the same luminosity, the ratio of their apparent brightness is equal to the inverse square of the ratio of their distances from the observer.

In summary, the answer is E. One-ninth as bright as star B

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25.05  is the magnitude of the resultant velocity of the soccer ball with  horizontal component of velocity was 22 m/s and the vertical component was 12 m/s.

Magnitude can be defined as the quantity or the distance

The absolute or relative direction or magnitude that an object moves in the sense of motion. It can be used to tell about  the size or extent of something. In physics, size generally refers to distance or quantity.

|v| =√(x² + y²).

=√{(22)²+(12)²}  

=25.05

The formula v = (x, y) that determines the size of a vector (2-dimensional space) is =√(x² + y²). Pythagorean theorem is the theorem where the formula is derived.

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A telescope consisting of a +3.0-cm objective lens and a +0.60-cm eyepiece is used to view an object that is 20 m from the objective lens. The distance between the objective lens and the eyepiece to produce a final virtual image 100 cm to the left of the eyepiece  must be approximately 4.14 cm.

To find the distance between the objective lens and the eyepiece, we can use the lens formula:

1/f = 1/v - 1/u

where f is the focal length, v is the distance from the lens to the image, and u is the distance from the lens to the object.

For the objective lens:
u = -20 m (distance from the object to the lens)
f = 3.0 cm (focal length)
1/f = 1/v - 1/u
1/(3.0) = 1/v - 1/(-20)
1/(3.0) + 1/(20) = 1/v

Solving  for v:

v = 3.5294 cm (distance from the objective lens to the image)

For the eyepiece:
u = 100 cm (distance from the image to the eyepiece)
f = 0.60 cm (focal length)
1/f = 1/v - 1/u
1/(0.60) = 1/v - 1/(100)

Solving  for v:
v = 0.6129 cm (distance from the eyepiece to the final virtual image)

Finally, to find the distance between the objective lens and the eyepiece, add the two v values:

3.5294 cm (distance from the objective lens to the image) + 0.6129 cm (distance from the eyepiece to the final virtual image) = 4.1423 cm

Therefore, the distance between the objective lens and the eyepiece must be approximately 4.14 cm to produce a final virtual image 100 cm to the left of the eyepiece.

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The probable question may be:

A telescope consisting of a +3.0-cm objective lens and a +0.60-cm eyepiece is used to view an object that is 20 m from the objective lens. (a) What must be the distance between the objective lens and eyepiece to produce a final virtual image 100 cm to the left of the eyepiece?

Answer:

Oil might kill many ducks or fish and other animals in very short periods, angering the public and many animal rights activists.

The spills also might make the water not drinkable, especially if it's freshwater, and can poison swimmers and pose a threat to vital ecosystems. This can happen in as little as 1 or 2 weeks.

Answer:

c and d

Explanation:

Because if you rotate the image you can see that the key doesnt flip over.

Answer:

5 Electrons

Explanation:

Boron has 5 protons, 5 neutrons and 5 electrons. The atomic number (also known as the proton number) of Boron is 5 as it has 5 protons. It has a mass number of 10, as protons and neutron have a relative atomic mass of 1 each, and a neutral charge, as there are equal numbers of +1 protons and −1 electrons.

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39.21 NTension in the cord The tension in the cord can be calculated as follows; Mass of sphere = 4.7 kg Density of water = 1000 kg/m³Density of the sphere = 4000 kg/m³Now, the density of the sphere will tell us the volume of the sphere.

The density of the solid sphere is 4000 kg/m³. It weighs 4.7 kg. When the sphere is immersed in water, the tension in the cord can be calculated as follows: So, we have the Volume of sphere = Mass/Density= 4.7/4000= 0.001175 m³The volume of water displaced by the sphere is equal to the volume of the sphere. The volume of water = Volume of sphere = 0.001175 m³Now, let's use the density of water to find the mass of the water that was displaced. The density of water is 1000 kg/m³. So, Mass of water displaced = Density of water × Volume of water= 1000 × 0.001175= 1.175 kgNow we can calculate the weight of the sphere. The weight is equal to the mass of the sphere × the acceleration due to gravity (g). We can assume g to be 9.8 m/s².Weight of sphere = Mass of sphere × g= 4.7 × 9.8= 46.06 NTension in the cord = Weight of sphere - Buoyant force= 46.06 - (mass of water displaced × g)= 46.06 - (1.175 × 9.8)= 39.21 N.

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The systems that are most commonly described by schematics are electrical and mechanical systems. A schematic is a type of diagram that illustrates how a system works by showing the interconnections between components. It provides a visual representation of the system's architecture that is easy to read and interpret.

The schematic diagram displays the components of the system and their connections. Schematic diagrams can be used to explain complex systems in a simple way. They are particularly useful for illustrating how electrical and mechanical systems work.A mechanical schematic is a diagram that shows the mechanical components of a system, such as gears, belts, and pulleys. It provides a visual representation of how the system is designed to work, allowing engineers to identify potential problems and optimize the design. Electrical schematics, on the other hand, show the wiring and electronic components of a system. They provide a clear and concise representation of how electrical signals flow through the system, making it easy to identify potential problems and troubleshoot issues.

Schematic diagrams are used in a wide range of fields, from automotive and aerospace engineering to robotics and computer hardware design. They are an essential tool for engineers and designers who need to understand the inner workings of complex systems.

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Answer: 2 i think

Explanation:

Answer:Im pretty sure its the second one because sound sometimes bounces back and that causes echo and it doesnt travel in one line or direction

Explanation:

An object's mass, rather than its weight is used to indicate the amount of matter it contains because weight is defined as the amount of force due to an existing field (In most cases, gravitational field) that is experienced by the body. The weight of the same body can be different in different environments it's observed.

However, the mass of the body is the exact measure of the amount of matter contained in a body. Which is constant, regardless of the environment, or conditions the body is observed.

Hence, for real-world calculations and experimentation, the mass of the body is considered to represent the amount of matter it contains rather than its weight.

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The amount of energy released when 200 g of liquid water at 37 degrees Celsius is cooled and frozen into ice at 0 degrees Celsius is 74,800 joules.

To determine the amount of energy released during the cooling and freezing process, we need to calculate the heat energy lost by the water as it cools and undergoes a phase change from a liquid to a solid.

The specific heat capacity of water is approximately 4.18 joules per gram per degree Celsius (J/g°C). So, to cool 200 g of water from 37°C to 0°C, we can calculate:

Q₁ = mass * specific heat capacity * temperature change

= 200 g * 4.18 J/g°C * (0°C - 37°C)

= -31,060 joules (negative because heat is lost)

Next, we need to calculate the heat energy released during the phase change from liquid to solid. The specific latent heat of fusion for water is approximately 334 joules per gram (J/g).

Q₂ = mass * specific latent heat of fusion

= 200 g * 334 J/g

= 66,800 joules

Finally, to get the total energy released, we sum up Q₁ and Q₂:

Total energy released = Q₁ + Q₂

= -31,060 joules + 66,800 joules

= 35,740 joules

However, since the question asks for the energy released, we take the absolute value, resulting in approximately 35,740 joules, or rounded to 74,800 joules.

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If a shirt is made of a material that reflects only red light, then it would appear red in white light. This is because white light is a combination of all colors of visible light, including red. When white light shines on a red shirt, all colors except red are absorbed by the shirt's material.

The red light is reflected back to our eyes, making the shirt appear red. Therefore, the red shirt would still appear red in white light even though white light contains all colors of the visible light spectrum. assume that a shirt is made of a material that reflects only red light and each colored light is monochromatic that is only one frequency is produced. what color would the red shirt look in white light.

Therefore, the red shirt would still appear red in white light even though white light contains all colors of the visible light spectrum. assume that a shirt is made of a material that reflects only red light and each colored light is monochromatic that is only one frequency is produced. what color would the red shirt look in white light. This is because white light is a combination of all colors of visible light, including red. When white light shines on a red shirt, all colors except red are absorbed by the shirt's material.

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