While analyzing smoke detector designs that rely on the photoelectric effect, you are evaluating surfaces made from each of the materials listed in (Figure 1). One particular application uses ultraviolet light with wavelength 273 nm

The velocity of the jet is calculated to be 900 miles/hr when the relation between velocities of both propeller and the jet is given.

The distance travelled by a propeller plane and a jet = 3000 miles

Velocity of the plane Vp = 1/3 Velocity of the jet Vj

Vp = 1/3 Vj

Vj = 3 Vp ----(1)

Time taken by the propeller plane to complete the trip = 10 hours

Velocity of the propeller plane = Distance of the propeller plane/Time

⇒ 3000/10 = 300 miles/hr

The velocity of the jet = 3 times the velocity of the propeller plane

⇒ 3 × 300 miles/hr = 900 miles/hr

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Answer:

a. TRUE

Explanation:

When a satellite is launched to orbit around earth, it has to produce its own artificial gravity by performing rotations. The frequency of this rotation is given by the following formula:

f = √[ac/4πR²]

where,

f = frequency

ac = centripetal acceleration

R = Radius of the satellite

Therefore, it is clear from this formula that the frequency of rotation of the satellite is independent of its height above the surface of earth. So, the correct option is:

a. TRUE

Normal force: push due to contact with a surface such as the ground. always acts perpendicular to the surface.

The normal force is an everyday force that is felt when a surface pushes against an object that is placed on that surface.

For example, when a book is placed on a table, the normal force keeps the book from falling through the table. Gravity is pulling the book downward, but since the book isn't actually falling, something must be pushing it up. This force is called the normal force. The name 'normal' means perpendicular to the surface.

The normal force arises from the electromagnetic force; specifically, the electrons in the book push against the electrons in the table. Since the electrons don't want to get any closer to each other, the book stays on top of the table.

The normal force is closely related to the friction force. Both are non-conservative forces, which can be seen when a ball bounces. The ball falls; gravity pulls it down, so it speeds up, while air drag somewhat slows the fall.

When the ball hits the ground a huge normal force pushes upwards, making the ball bounce not quite as high as when it started. There is energy lost to changing the shape of the ball, which becomes thermal energy (warming the ball) and sound. The normal force can also be seen as non-conservative in the case of rolling resistance. The deformation of the tire (or wheel) means that energy is being lost to that change of shape.

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Answer:

dang, you are really trying to get everyone to do your heavy lifting lol.

I'll do coal. and maybe a little more.

Explanation:

Coal What is it?

Coal is a combustible black or brownish-black sedimentary rock, formed as rock strata called coal seams. Coal is mostly carbon with variable amounts of other elements; chiefly hydrogen, sulfur, oxygen, and nitrogen.

Coal How we obtain it:

Coal can be extracted from the earth either by surface mining or underground mining. Once coal has been extracted, it can be used directly (for heating and industrial processes) or to fuel power plants for electricity. If coal is less than 61 meters (200 feet) underground, it can be extracted through surface mining.

Coal Pros:

Coal is plentiful in many places and it is easy to access through mining, so people rely on it to produce energy. Coal is easy to store. Once it is mined it can be safely stored with no hazard of fire or explosion like there is with gas or oil. It is relatively easy and inexpensive to convert coal into energy.

Coal Cons:

Coal is nonrenewable.  Coal contains the most CO2 per BTU, the largest contributor to global warming.  Severe environmental, social, and health, and safety impacts of coal mining.  The devastation of the environment around coal mines is heavy.  High cost of transporting coal to centralized power plants. Coal is really dirty and not good.

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Solar What is it?

Solar energy is radiant light and heat from the Sun that is harnessed using a range of ever-evolving technologies such as solar heating, photovoltaics, solar thermal energy, solar architecture, molten salt power plants and artificial photosynthesis.

Solar How we obtain it:

Solar technologies convert sunlight into electrical energy either through photovoltaic (PV) panels or through mirrors that concentrate solar radiation. This energy can be used to generate electricity or be stored in batteries or thermal storage.

Solar Pros:

It's clean energy. Solar power is pollution-free and causes no greenhouse gases to be emitted after installation.  It has reduced dependence on foreign oil and fossil fuels.  It is renewable clean power that is available every day of the year, even cloudy days produce some power.  It gives a return on investment unlike paying for utility bills.

Solar Cons:

Solar doesn't work at night. Solar panels are not attractive. You can't install a home solar system yourself. My roof isn't right for solar. Solar hurts the environment. Not all solar panels are high quality.

Digital signals are represented by a binary waveform.

Binary waveforms represent digital signals. Digital signals are characterized by discrete levels or values, typically represented as 0s and 1s. These signals are used in digital communication systems and computer systems to transmit and process information.

Binary waveforms are used to represent binary data, where each bit (0 or 1) represents a specific state or information. These waveforms can be in the form of square waves, where the signal transitions between two discrete voltage levels, or pulses, where the signal is represented by the presence or absence of a pulse.

Binary waveforms are commonly used in various applications, including digital communication protocols (such as Ethernet and USB), computer systems (binary data processing), digital audio and video transmission, and many other digital devices and systems.

The use of binary waveforms allows for reliable and efficient transmission and processing of information, as the discrete levels simplify the representation and interpretation of data.

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The magnitude of the racquetball's change in momentum is 0.59 kgm/s approximately.

Given that a racquetball with a mass of 42 g is moving with a horizontal speed of 7 m/s to the right (+x direction).

mass m  = 42g = 42/1000 = 0.042kg

initial velocity before collision u = 7 m/s

It hits the wall of the court and rebounds to the hitter with a horizontal speed of 7m/s to the left (-x direction). That is,

velocity after collision v = 7 m/s

To calculate the magnitude of the racquetball's change in momentum, we will use the formula below

Change in momentum = Mv - Mu

Since momentum is a vector quantity, we will consider the direction.

Change in momentum = 0.042 x 7 - ( 0.042 x - 7)

Change in momentum = 0.294 + 0.294

Change in momentum = 0.588 kgm/s

Therefore, the magnitude of the racquetball's change in momentum is 0.59 kgm/s approximately.

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Answer:

a

Explanation:

Answer:

b. 19026000gk

a. 5.281

c. 219.2

Explanation:

ANSWER:

0.00145 J

STEP-BY-STEP EXPLANATION:

Using the rotational form of the kinematic equation to find α:

It started form rest:

Solving for α:

The torque is given by the formula,

The direction of the break dancer is always changing hence we can say that the break dancer is accelerating.

The term acceleration means change of velocity with time. It refers to the time taken for the velocity of a body to change in a specified direction. Recall that velocity takes direction into account.

The direction of the break dancer is always changing hence we can say that the break dancer is accelerating since his direction is changing even though the speed is constant.

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When the core temperature rises, stars start burning helium to carbon. This rise in temperature is brought on by. creating helium by fusing hydrogen in a shell.

When carbon and helium are combined, oxygen is created. Helium burns to create carbon. The star's surface temperature rises as it develops into a horizontal branch star as its core becomes rich in carbon and oxygen nuclei. When their brilliance remains constant, stars with masses larger than or equal to the Sun shrink and get hotter.

When it becomes heated enough, hydrogen in a shell outside the core can begin to fuse. The exterior is expanding.

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The distance of the surface illuminated by the light of the given wavelength is 5,269.32 m.

The distance of the surface illuminated by the light of the given wavelength is calculated as follows;

D = (rd)/(0.61λ)

where;

D = (0.45 x 0.005) / (0.61 x 700 x 10⁻⁹)

D = 5,269.32 m

Thus, the distance of the surface illuminated by the light of the given wavelength is 5,269.32 m.

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The 3rd model describes how light reacts with a red jacket.

When white ray of light gets to a red surface object, the red surface absorbs the green and blue light thereby reflecting red ray of light.

Light is a type of electromagnetic radiation that is visible to the human eye. It is a form of energy that travels in waves and has both electric and magnetic properties.

Light can be produced naturally, such as by the sun, or artificially, such as by light bulbs or lasers.

Light has a wide range of properties, including its wavelength, frequency, and intensity.

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Answer:

Vertebrate zoology

Explanation:

Have a great day!

The relative density of the substance is equal to the density of the substance concerning the density of the reference substance.

The relative density of the substance is known as the specific gravity.

Hence, option B is the correct answer.

Answer: 0.5334

Explanation:

i got it right on accellus :p

Volume of value V = 0.5333 \(m^{3}\)  is below the water line .

Archimedes' principle states that a body immersed in a fluid is subjected to an upwards force equal to the weight of the displaced fluid.

F(b) = rho*g*V

F(b) = buoyant force

rho = fluid density

g = acceleration due to gravity

V = fluid volume

given

density of raft = 373 kg/\(m^{3}\)

volume of raft = 1.43 \(m^{3}\)

since, density  = mass / volume

mass of raft = density * volume

                    = 373 * 1.43 = 533.3 kg

using Archimedes principal

Force = density of liquid * volume of liquid displaced * acceleration due to                gravity

  mg        = 1000 * V * 9.8

  533.3 * 9.8 = 1000 * V * 9.8

  V = 0.5333 \(m^{3}\)

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Answer:

a. Acceleration, a = 1.47 * 10^{-9} m/s²

b. Mass = 4.57 * 10^{10} kilograms

c. Force = 67.12 Newton

Explanation:

Given the following data;

Distance = 93 cm to meters = 93/100 = 0.93 meters

Weight = 67 N

Time = 9.89 hours to seconds = 35604 seconds

Initial velocity = 0 m/s (since it's starting from rest)

Acceleration due to gravity, g = 9.8 m/s

a. To find the acceleration, we would use the second equation of motion;

\( S = ut + \frac{1}{2} at^{2} \)

Where;

S is the distance covered or displacement of an object.

u is the initial velocity.

a is the acceleration.

t is the time.

Substituting the values into the equation, we have;

\( 0.93 = 0*35604 + \frac{1}{2} * a*35604^{2} \)

\( 0.93 = 0 + \frac{1}{2} * 1267644816a \)

\( 0.93 = 633822408a \)

\( Acceleration, a = \frac{0.93}{633822408} \)

Acceleration, a = 1.47 * 10^{-9} m/s²

b. To find the mass

Weight = mass * acceleration due to gravity

67 = mass * 1.47 * 10^{-9}

\( Acceleration, a = \frac{67}{1.47 * 10^{-9}} \)

Mass = 4.57 * 10^{10} kilograms

c. To find the force;

Force = mass * acceleration

Force = 4.57 * 10^{10} * 1.47 * 10^{-9}

Force = 67.12 Newton

The speed of the Triumph TR-7 after 10 seconds is 23 m/s.

The distance traveled by the Triumph TR-7 after 10 seconds is 115 meters.

To calculate the speed of the Triumph TR-7 after 10 seconds, we can use the equation:

v = u + at

Where:

v is the final velocity,

u is the initial velocity (which is 0 m/s since the car starts from rest),

a is the acceleration, and

t is the time.

Given:

Acceleration (a) = 2.3 m/s²

Time (t) = 10 seconds

Plugging in the values:

v = 0 + (2.3 m/s²) * (10 s)

v = 23 m/s

To calculate the distance traveled by the car, we can use the equation:

\(s = ut + (\frac{1}{2} )at^2\)

Where:

s is the distance,

u is the initial velocity,

a is the acceleration, and

t is the time.

Plugging in the values:

\(s = [(0) * (10)] + [(\frac{1}{2} ) * (2.3) * (10 )^2]\)

s = 1.15 m/s² * 100 s²

s = 115 m

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The speed at which the driver must drive for the remaining time to complete the trip in the usual time is 61.25 miles per hour.

The total distance the driver should cover is 500 miles and this should be completed in 9 hours.

Based on the information provided, the regular speed is:

However, we know today he has covered 110 miles and he is 20 minutes late. This means, there are 390 miles to cover and the remaining time is 6.7 hours.

Based on this, let's calculate the new speed:

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The cart A experienced the greatest impulse.

The given parameters;

Impulse is defined as the product of the applied force  and time of action of the applied force.

J = Ft

where;

J is the impulse

F is the applied force

t is the time of action

The impulse experienced by cart A;

J = 2 x 2 = 4 Ns

The impulse experienced by cart B;

J = 1 x 3 = 3 Ns

Thus, the cart A experienced the greatest impulse.

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Two common stars are observed by an astronomer. It turns out that the first one is twice as hot as the second. This indicates that the first emits around 16 times as much energy as the second.

Astronomers are specialists in the field of astronomy, which is the study of celestial bodies and phenomena. They use various methods to explore and understand space beyond Earth, including using telescopes, satellites, and mathematical models.

They also compile data on different astronomical objects into comprehensive databases that can be used by researchers all over the world. This helps us to better understand our universe and how it works. Additionally, astronomers work towards developing new technologies that will help us probe further into space. As we continue to learn more about our galaxy and its many inhabitants, astronomers have a significant role to play in informing society about these discoveries.

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The height of the ceiling at the center of the whispering gallery is approximately 43.3 feet.

In an ellipse, the sum of the distances from any point on the ellipse to its two foci is constant. In this case, the two foci are located 25 feet from the center of the hall.

Given that the hall is 100 feet in length, the distance from one end to the center is 50 feet. We can consider this as the semi-major axis (a) of the ellipse.

The sum of the distances from any point on the ellipse to its two foci is equal to 2a. Thus, the sum of the distances from the ceiling at the center of the hall to the two foci is also 2a.

Since the foci are located 25 feet from the center, the sum of the distances is 2a = 50 feet.

To find the height of the ceiling at the center, we need to determine the semi-minor axis (b) of the ellipse. The semi-minor axis can be calculated using the formula:

b = √(a² - c²)

where c represents the distance from the center to each focus. In this case, c = 25 feet.

Substituting the values into the formula:

b = √(50² - 25²)

b = √(2500 - 625)

b = √(1875)

b = 43.3 feet

Therefore, the height of the ceiling at the center of the whispering gallery is approximately 43.3 feet.

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Answer:

vb = 22.13 m/s

So, the only thing that was measured here was the height of point A relative to point B. And the Law of Conservation of Energy was used.

Explanation:

In order to find the speed of roller coaster at Point B, we will use the law of conservation of Energy. In this situation, the law of conservation of energy states that:

K.E at A + P.E at A = K.E at B + P.E at B

(1/2)mvₐ² + mghₐ = (1/2)m(vb)² + mg(hb)

(1/2)vₙ² + ghₐ = (1/2)(vb)² + g(hb)

where,

vₙ = velocity of roller coaster at point a = 0 m/s

hₙ = height of roller coaster at point a = 25 m

g = 9.8 m/s²

vb = velocity of roller coaster at point B = ?

hb = Height of Point B = 0 m (since, point is the reference point)

Therefore,

(1/2)(0 m/s)² + (9.8 m/s²)(25 m) = (1/2)(vb)² + (9.8 m/s²)(0 m)

245 m²/s² * 2 = vb²

vb = √(490 m²/s²)

vb = 22.13 m/s

So, the only thing that was measured here was the height of point A relative to point B. And the Law of Conservation of Energy was used.

According to special relativity, one can travel at increased rates. However, this is only possible when moving at very high speeds approaching the speed of light. When an object moves at high speeds, the time slows down, and the length of the object appears to be shortened.

These observations are known as time dilation and length contraction. Time dilation refers to the difference in the elapsed time measured by two observers, where one is stationary, and the other is moving at a constant velocity relative to each other. The faster the moving observer, the slower time appears to be for them. Length contraction, on the other hand, refers to the phenomenon where an object appears to be shorter in length when it's moving at high

This effect is more noticeable as the speed of the object approaches the speed of light. As a result, traveling at very high speeds can allow one to cover great distances in less time, which can be used for space exploration and other scientific research. However, it's worth noting that the effects of relativity are only noticeable at very high speeds, which are currently impossible to achieve with our current technology.

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Answer:

d. zero

Explanation:

Constant velocity means the acceleration is zero. In this case the velocity does not change,

hope this helps you

have a good day :)

Answer:

32 meters

Explanation:

Use the formula for displacement

d = ut + (1/2)at²

where u = initial velocity , a is the acceleration and t is the time traveled

First let's find the acceleration given by (v - u)/t where v is the final velocity and t the time taken to reach this final velocity from initial velocity u

v = 0 , t = 4 secs, u = 16 m/s

a = (0 - 16)/4 = -16/4 = -4 m/s²

Plugging in values for u= 16 and a = -4 we get

So d = 16t + (1/2)(-4)t

= 16t -2t

Plugging in value for t = 4 gives us

= 16 x 4 - 2 x 4 x 4

= 64 - 32

= 32 meters

The graph shows that the block of ice is initially heated until it reaches the melting point, where it undergoes the phase change from solid to liquid.

Based on the information provided, the graph of temperature against thermal energy absorbed indicates the heating process of a block of ice starting at -20°C until it turns to steam. The key feature to consider in this scenario is the plateau region on the graph, which represents the phase change from solid to liquid and from liquid to gas. The latent heat of fusion of ice is the amount of energy required to change a substance from a solid to a liquid state without changing its temperature. In this case, it is given as 340 kJ/kg. During the initial phase, as the ice is heated from -20°C, its temperature gradually rises until it reaches the melting point of ice (0°C). At this point, the energy absorbed is used to break the intermolecular bonds and convert the ice into water. The temperature remains constant at 0°C during this phase change, despite the continuous addition of thermal energy. Once all the ice has melted into water, the temperature starts rising again until it reaches the boiling point of water (100°C). During this phase, the thermal energy absorbed is utilized to convert the liquid water into steam or water vapor. Similar to the melting phase, the temperature remains constant at the boiling point during this phase change. The plateau regions on the graph represent the latent heat of fusion and the latent heat of vaporization, respectively. These phases require a significant amount of thermal energy to break intermolecular bonds and change the substance's state without a change in temperature. Then, the temperature continues rising until it reaches the boiling point, where another phase change occurs from liquid to gas. The latent heat of fusion of ice (340 kJ/kg) represents the energy required to convert the ice into water without changing its temperature.

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