light is projected onto a semi-conductive surface. however, no electrons are ejected. if the intensity is held constant but the frequency of light is increased, what will happen?

Answer:

(B) The bolt was magnetized.

Explanation:

(B) The bolt was magnetized.

Answer:

f/2

Explanation:

In this case the force that is necessary to keep the object moving in a curved path and that is directed inward toward the center of rotation, centripetal force = f

f= m × centripetal acceleration

centripetal acceleration = V^2/r

Therefore f = m (2v)^2 /r --------1

If frictional force required to keep the large car on the road = F

F= 2m (v)^2/ r----------2

Now Divide 1st equation by 2nd one

f/F = m (2v)^2/2m(v)^2

f/F = 2

F= f/2

The point in the motion where the velocity is zero and the acceleration is zero simultaneously is at the extreme points of the oscillation, where the displacement is equal to the amplitude (x = ±A).

x(t) = A * cos(2πt/T)

v(t) = -A * (2π/T) * sin(2πt/T)

a(t) = -A * (2π/T)^2 * cos(2πt/T)

v(t) = 0

a(t) = 0

Let's solve these equations:

For v(t) = 0: -A * (2π/T) * sin(2πt/T) = 0

sin(2πt/T) = 0

This equation is satisfied when 2πt/T = nπ, where n is an integer.

For a(t) = 0: -A * (2π/T)^2 * cos(2πt/T) = 0

cos(2πt/T) = 0

In simple harmonic motion (SHM), the velocity of the mass changes direction at the extreme points of the oscillation. At these points, the velocity is momentarily zero before changing direction.

Similarly, the acceleration of the mass is directed towards the equilibrium position (x = 0) at the extreme points. At these points, the acceleration is momentarily zero before changing direction.

Therefore, the correct answer is: None of the above.

The velocity is zero and the acceleration is zero simultaneously at the extreme points of the motion, where x = ±A.

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The first two choices are both false, but the second one is the falser one.

All electricity sources do not have the same voltage. The outlet in your bedroom wall supplies 120 volts, but the USB port on your laptop only supplies 5 volts, and the battery in your cellphone only supplies 3.7 volts.

All electricity sources have the same voltage isn't true

All electricity sources usually have different voltage as the number of

electrons needed to power them varies. For example heating appliances

usually have a higher amount of voltage as it requires more electrons to

increase the temperature.

The higher the amount of voltage , the higher the amount of electrons which collides more and translates to faster current  which is correct.

Voltage is also known as the difference in electrical potential energy and the unit for voltage is Volt (V).

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To determine the diameter of the cylindrical rod that can withstand a load of 650 N, we need to consider the yield strength of the material and the applied load. the diameter of the rod is approximately 11.62 mm.

By using the formula for stress (force divided by area) and rearranging it to solve for the diameter, we can find the required diameter of the rod.

The stress experienced by the rod can be calculated using the formula:

Stress = Force / Area

Given that the yield strength of the steel is 310 MPa, we can set up the equation:

310 MPa = 650 N / (π * (diameter/2)^2)

We can rearrange the equation to solve for the diameter:

diameter = √(650 N / (310 MPa * π)) * 2

Substituting the given values, we find:

diameter ≈ √(650 / (310 * 10^6 * π)) * 2 ≈ 11.62 mm

Therefore, the required diameter of the rod to withstand the load is approximately 11.62 mm.

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Answer:

icebergs float on water because ice is less dense than water. The same is true for a boat: a boat floats on water because, overall, it is less dense than the water.

Explanation:

Answer:

I think its 1

Explanation:

The reason why I think it's 1 is because 0.5m/s^2 /0.5 m/s= 1 s

Answer:

Explanation:

Work done on the lever ( input energy ) = force applied x input distance

= 24 N x 2m = 48 J

Work done by the lever ( output energy ) = load x output distance

= 72 N x 0.5m = 36 J

efficiency = output energy / input energy

= 36 J  / 48 J

= 3 / 4 = .75

In percentage terms efficiency = 75 % .

In workplaces with continuous noise, such as mines, the use of protective gear like ear muffs is encouraged to reduce the amount of noise entering workers' ears. This not only protects their hearing but also helps decrease compensation costs associated with hearing-related injuries.

However, it is important to recognize that these protective gears have limitations. Over time and with extensive use, they can become damaged and less effective at reducing noise exposure. Despite the importance of wearing protective gear, some workers may choose to remove their ear muffs due to discomfort or the desire to hear their colleagues more clearly. This poses a challenge as it increases their risk of being exposed to excessive noise levels, which can lead to hearing damage or loss.

To address this issue, employers should focus on providing comfortable and properly fitting protective gear that minimizes discomfort. Additionally, regular training and awareness programs can emphasize the importance of consistent use of protective gear and educate workers about the potential long-term consequences of noise exposure. Encouraging an open dialogue between workers and management can also help address any concerns or misconceptions related to the use of protective gear.

Ultimately, striking a balance between comfort and safety is crucial. Employers should strive to provide effective and comfortable protective gear, while workers need to understand the importance of consistent usage to safeguard their hearing health in noisy work environments.

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We have developed an expression for (dT/dP)_s in terms of T, V, α, KT, and shown that Ks/KT = Cv/Cp.

We can start by expressing the adiabatic compressibility (Ks) and the isothermal compressibility (KT) in terms of the specific volume (V) and the coefficient of thermal expansion (α).

Ks = 1/V (dV/dP)_s
KT = 1/V (dV/dP)_T

Now, we can use the following relationship between α, KT, and (dT/dP)_T:

α = -KT (dT/dP)_T

Let's also recall the definition of heat capacities:

Cp - Cv = T (dV/dP)_T (dV/dP)_s

Using the expressions for KT and Ks:

Cp - Cv = TV(KT)(Ks)

Now, we want to find (dT/dP)_s. Let's rewrite the relationship between α, KT, and (dT/dP)_T as follows:

(dT/dP)_T = -1/(αKT)

Next, we'll substitute this expression into the Cp - Cv equation:

Cp - Cv = -TV(KT)(Ks)(αKT)

Divide both sides by -TV(αKT^2):

Cp/Cv = Ks/KT

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Space telescopes must be placed in orbit around earth in order to observe short-wavelength radiation.

A telescope is an optical instrument that uses lenses, curved mirrors, or a combination of both to watch distant objects.

When atoms in a gas reach this temperature, they travel so quickly that when they collide, they release X-ray photons with wavelengths smaller than 10 nanometers.

Because the Earth's atmosphere prevents all X-rays from space, these wavelengths must be seen using space telescopes.

To study short-wavelength radiation, space telescopes must be put in orbit around the Earth.

Hence, space telescope is the correct answer.

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Answer:

The hunter should aim directly at the perched monkey because the tranquilizer dart will fall away from the line sight at the same rate that the monkey falls from its perch.

Tan theta = 9 / 90 = .1      so theta = 5.71 deg

The time for the monkey to reach the ground is

t = (2 h / g)^1/2 = (18 / 9.8)^1/2 = 1.36 sec

So the horizontal speed of the dart must be at least

Vx = 90 m / 1.36 sec = 66.4 m/s

Vx = V cos theta

V = 66.4 m/s / cos 5.71 = 66.7 m/s

The angle of projection of the tranquilizer dart is 5.7⁰

The horizontal speed of the tranquilizer dart is 66.5 m/s

The given parameters;

The angle of projection of the tranquilizer dart is calculated as;

\(tan(\theta) = \frac{y}{x} \\\\tan(\theta) = \frac{9}{90} \\\\tan(\theta) = 0.1\\\\\theta = tan^{-1}(0.1)\\\\\theta = 5.71 ^0\)

The speed of the tranquilizer dart is calculated as;

X = v₀ₓt

where;

t is the time to reach maximum height

X is the horizontal displacement = 90 m

The time to reach maximum height is calculated as;

\(h = v_0_yt + \frac{1}{2} gt^2\\\\h = 0 + \frac{1}{2} gt^2\\\\h = \frac{1}{2} gt^2\\\\t = \sqrt{\frac{2h}{g} } \\\\t = \sqrt{\frac{2\times 9}{9.8} } \\\\t = 1.36 \ s\)

The horizontal speed of the tranquilizer dart is calculated as;

\(X = v_0cos(\theta) \times t\\\\90 = v_0\times cos(5.71) \times 1.36\\\\90 = 1.353 v_0\\\\v_0= \frac{90}{1.353} \\\\v_0 = 66.5 \ m/s\)

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Answer:

The swimmer must swim at 1.12 m/s at 26.565 ° upstream from the opposing bank, according to the parallelogram rule of vectors.

What is parallelogram law of vector addition?

If two vectors act along two consecutive sides of a parallelogram (with magnitude equal to the length of the sides) both heading away from the common vertex, then the resultant is represented by the parallelogram's diagonal passing through the same common vertex.

Explanation:

Let, the current's speed be x = 0.5 m/s, the swimmer's speed be y m/s and the angle between them be a°. The resulting speed at b° angle with x will be r = 1.0 m/s. Assuming b is 90°.

Then, the parallelogram law of vectors states that

Sin b = y Sin a/r

=> y Sin a = r

=> y Sin a = 1

And Cos b = (x + y Cos a)/r

=> y Cos a = -x = -0.5

Therefore, tan a = 1/ (-0.2)

=> tan a = -2

As a result, a = 116.565°

Consequently, y = 1/Sin a

=> y = 1/ Sin116.565°

=> y = 1.118 ≈ 1.12 m/s

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An airmass is cooled without a change in the water vapor content, its humidity will increase due to the decrease in temperature and subsequent increase in relative humidity.

Humidity is a measure of the amount of water vapor present in the air. When the temperature of an airmass decreases, its capacity to hold water vapor decreases. This means that the same amount of water vapor that was present in the warmer airmass will now occupy a smaller space in the cooler airmass. As a result, the relative humidity of the airmass increases, even though the amount of water vapor has not changed. For example, if a warm and humid airmass cools down as it moves over a mountain range, the relative humidity will increase, and the excess water vapor may condense into clouds and precipitation. This is why many mountainous regions experience high levels of precipitation, even if they are located in dry or arid climates.

Relative humidity is a measure of how much water vapor is in the air compared to the maximum amount of water vapor the air can hold at a given temperature. When the temperature of the airmass decreases and the water vapor content remains the same, the air can hold less moisture. As a result, the relative humidity increases because the air becomes closer to its saturation point.

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Answer:

ok lol

Explanation:

ok but I will still answer

Answer:daddy

Explanation:

The energy density of most enteral formulas is between 1.0 and 2.0 kilocalories per milliliter (kcal/mL).

The energy density of enteral formulas refers to the amount of calories (energy) contained within a given volume of the formula. Enteral formulas are specially designed liquid nutrition products used for individuals who are unable to consume food orally or have difficulty absorbing nutrients from solid food.

The energy density of most enteral formulas typically falls within the range of 1.0 to 2.0 kilocalories per milliliter (kcal/mL). This range allows for flexibility in meeting individual energy needs based on factors such as age, medical condition, and nutritional requirements.

Enteral formulas with lower energy density, such as 1.0 kcal/mL, are often used for individuals who require a lower calorie intake or have specific dietary restrictions. These formulas may be recommended for those with certain gastrointestinal disorders or conditions where a slower rate of nutrient delivery is desired.

On the other hand, enteral formulas with higher energy density, such as 1.5 or 2.0 kcal/mL, are utilized when higher calorie requirements need to be met within a smaller volume. These formulas may be beneficial for individuals with increased energy needs, such as those recovering from surgery, trauma, or severe malnutrition.

It's important to note that the energy density of enteral formulas can vary among different brands and types of products. Additionally, the choice of an enteral formula and its energy density should be made under the guidance of a healthcare professional or registered dietitian, considering the specific nutritional needs of the individual.

Hence, The energy density of most enteral formulas is between 1.0 and 2.0 kilocalories per milliliter (kcal/mL).

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Answer:

Below

Explanation:

Measure distance to pistol .....

  speed of light is nearly instantaneous in this situation (short distance)

     measure time from flash to hearing the sound

        speed of sound =  distance to pistol / time to hear

Answer:

Any medium or material of high refractive density e.g Water which refracts the light rays 1&2 away from their normal

When using statistics from news articles or information from other sources, people should exercise caution because they might not always reflect the whole picture or might be presented in a biased or misleading way.

Statistics are not always based on accurate or reliable data, and they can be readily manipulated or misunderstood to support an agenda or stance.

Before making any decisions or acting on the data, it is essential to confirm the information's source and take into account the context in which it is presented. Furthermore, outdated or based on a small sample size statistical data may have an impact on their reliability and accuracy.

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Answer: Planets would be pulled into the sun

Explanation:

This is the correct answer.

Answer:

.12 * .12 = .0144        counterclockwise torque

.06 * .18 + W * .03 = .0108 + .03 W        clockwise torque

W = (.0144 - .0108) / .03 = .12 N     as requested

(.12 + .06 + .12) N = .30 N       total weight supported by thread

C) Suppose now rod supported at middle

.12 * .15 = .018 N      counterclockwise torque

.06 * .15 = .009 N     clockwise torque

Obviously the thread must be moved closer (left) to .12 weight to increase the clockwise torque (other weights are in the middle of the rod

At time t = 15/16, the object reaches a state of zero velocity, indicating a momentary pause in its motion. Prior to this time, the object moves in one direction, while after this time, it changes direction and moves in the opposite direction. The value t = 15/16 represents the specific moment when the object transitions from one direction to another and experiences a brief period of rest.

To find the velocity v(t) of the object at any time t, we differentiate the given distance function s(t) = 9 - 15t + 8t² with respect to time:

v(t) = d/dt (9 - 15t + 8t²)

Applying the power rule of differentiation, we obtain:

v(t) = -15 + 16t

Therefore, the velocity v(t) of the object at any time t is given by v(t) = -15 + 16t.

To determine when the object is at rest, we set the velocity v(t) equal to zero and solve for t:

-15 + 16t = 0

Adding 15 to both sides of the equation, we have:

16t = 15

Finally, dividing both sides by 16, we find

t = 15/16

Hence, the object is at rest when t = 15/16.

This means that at time t = 15/16, the object's velocity is zero, indicating that it is momentarily stationary. Before this time, the object is moving in one direction, and after this time, it is moving in the opposite direction. The value t = 15/16 represents the specific point in time when the direction of motion changes, and the object is at rest for an instant.

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The torque required to turn the camshaft without friction is 0 N-m. When friction is neglected, no external rotational force is needed to turn the camshaft as there is no resistance to overcome.

Torque is a measure of the rotational force applied to an object. In this case, neglecting friction means that there are no external forces resisting the rotation of the camshaft. Therefore, no torque is required to turn the camshaft. Friction is the force that opposes the motion of two surfaces in contact, and neglecting it means assuming that there is no resistance caused by friction.

When there is no friction, the camshaft can rotate freely without any additional torque being applied. This is because torque is only required to overcome the resistance caused by friction. In the absence of friction, the camshaft will experience no resistance and can rotate effortlessly.

Friction plays a crucial role in many mechanical systems, as it affects the efficiency and performance of various components. However, in this specific scenario where friction is neglected, the torque required to turn the camshaft becomes zero.

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a) The kinetic energy of the part is calculated using the formula K = ½mv², where m is the mass of the part and v is the velocity. Therefore, the kinetic energy of the part is 375,000 J.

b) Since the energy of the part is known and the velocity is given, the kinetic energy equation can be rearranged to solve for the height. By rearranging the kinetic energy equation to K = ½mv² = mgH and replacing the kinetic energy with 375,000 J and the mass with 250 kg, the height can be calculated to be 1,500 m. This means that the plane is 1,500 m above the ground when the part falls off.

The kinetic energy equation can be used to calculate the energy of an object given its mass and velocity, as well as calculate the height of the object given its mass, velocity, and energy. In this problem, the mass and velocity of the falling part were given, allowing us to calculate its kinetic energy. We then rearranged the equation to solve for the height, giving us the height of the plane when the part fell off.

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The wavelength of the light in diamond remains the same as its original wavelength, which is 435 nm. The refractive index of the medium does not affect the wavelength of the light when there is no refraction occurring.

When light passes through a medium, its wavelength can change due to the change in the speed of light in that medium. The speed of light in a medium is determined by the refractive index of the medium. In this case, blue light with a wavelength of 435 nm enters diamond, which has a refractive index (n) of 2.42.

To find the wavelength of the light in diamond, we can use Snell's law, which relates the incident angle, refracted angle, and refractive indices of two media:

n1 * sin(theta1) = n2 * sin(theta2)

In this case, we assume the incident angle and the refracted angle are small, so we can approximate sin(theta1) and sin(theta2) as the ratios of the angles to the distance from the normal.

Since the incident and refracted angles are not specified in the question, we can assume the light is incident perpendicularly (theta1 = 0). Therefore, sin(theta1) is 0, and we can simplify Snell's law:

n1 * sin(theta1) = n2 * sin(theta2)

n1 * 0 = n2 * sin(theta2)

0 = n2 * sin(theta2)

As sin(theta2) must be non-zero for a non-zero angle, we can conclude that the light does not refract and continues to travel in the same direction within the diamond.

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The greater the height of a ramp, the shorter the time it takes for an object to move down the ramp.

The greater the amount of salt, the In addition the larger the longer it takes water to boil.

An increase in volume of water increases the time it takes to boil and vice versa.

Increase in the length of the paper airplane, the farther it will fly.

Jumping Jack increases the heart rate.

A ramp is an inclined plane which is a form of simple machine that is used to lift heavy objects off the floor or to lower heavy objects down.

The greater the height of a ramp, the shorter the time it takes for an object to move down the ramp due to increased acceleration.

The addition of solutes to pure solvent raises the boiling point of the solute.

Therefore, the greater the amount of salt, the In addition the larger the longer it takes water to boil.

The mass of water increases with increase in volume of water.

Therefore, an increase in volume of water increases the time it takes to boil and vice versa.

For a paper airplane the larger its wings, the greater the lift generated.

The greater the lift, the farther the paper airplane will fly.

Therefore, an increase in the length of the paper airplane, the farther it will fly.

Exercise increases the heart rate.

Jumping jack is a for of exercise. Therefore, Jumping Jack increases the heart rate.

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Answer:

a

idkdidkdidkdkkdhdksijsnansjnshejdhjsnnebdhhdbsbbshshhsnsjshs

The answer is D, ethical concerns.

Good luck on the Unit Test, fellow edge.nuity user.

In order to make it simpler to align the slide and lens, the lowest magnification is chosen.

A microscope's ability to produce a picture of an object at a scale that is larger (or even smaller) than its real size is known as magnification. Only when it is feasible to observe more details of an object in the image than when observing the object with the unaided eye can magnification serve a beneficial purpose.

Now for the given question,

We use lowest magnification because using the lowest magnification means that the specimen is far enough away from the lens in comparison to the higher magnification lenses, offering the widest field of visible range. Starting with the lowest magnification, makes it simpler to find, center, and focus in on the specimen. It is also simpler to use the fine focus knob on the side of the microscope to focus on the specimen once it is visible at this magnification.

Additionally, the stage can be raised higher to bring the sample up closer to the eye piece by using the lowest magnification and thus shorter lens. A steady increase in magnification might offer a clearer view and a closer look at the specimen once it is in view.

The specimen needs to be carefully recentered and refocused when the magnification is increased. The challenge of utilizing these lenses is needing to "hunt" or reposition the specimen in the proper line of sight because the field of vision gets smaller and smaller with each increase.

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A steel cable is moving an elevator up an elevator shaft at a consistent speed. The consequences of friction are all insignificant. In this case, the forces acting on the elevator are such that the cable's upward force is equal to the force of gravity pulling downward.

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