Why will a struck tuning fork sound louder when it is held against a table?.

When particles in one region of a fluid gain thermal energy, they spread out further, move faster, and experience more collisions. As a result, the particles have a lower density and rise through the fluid.

The boiling of liquid on a stove is an example of thermal energy. Thermal energy is produced when a product's molecules and atoms move more quickly due to a rise in temperature.

There are three methods that thermal energy can be transferred: conduction, convection, and radiation. Conduction is the process of thermal energy transmission between molecules that are close to one another and in touch.

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Answer:

Explanation:

A simple pendulum consists of a mass (usually represented as a small object or bob) attached to a string or rod of negligible mass. The mass is free to swing back and forth under the influence of gravity.

In the figure, the point of suspension is denoted by "O," and the mass (bob) is represented by the small circle. The string or rod is represented by the vertical line connecting the point of suspension to the bob.

Amplitude:

The amplitude of a pendulum refers to the maximum displacement or swing of the bob from its equilibrium position. In the figure, the amplitude can be represented by the angle formed between the vertical position and the position of the bob when it swings to its maximum distance on one side. It is usually denoted by the symbol "A."

Effective Length:

The effective length of a pendulum refers to the distance from the point of suspension to the center of mass of the bob. It represents the distance over which the mass swings back and forth. In the figure, the effective length can be measured as the length of the string or rod from the point of suspension to the center of the bob. It is usually denoted by the symbol "L."

It is important to note that the amplitude and effective length of a simple pendulum affect its period of oscillation (the time taken for one complete swing). The relationship between these parameters and the period can be described by mathematical formulas.

Overall, the simple pendulum is a fundamental concept in physics and provides a simplified model for understanding oscillatory motion and the principles of periodic motion.

The width of the central maximum is approximately 11.44 cm.

None of the given options match the calculated value exactly, but the closest option is A. 0.34 cm.

Diffraction is a fundamental phenomenon in physics that occurs when waves encounter obstacles or pass through narrow openings. It refers to the bending, spreading, and interference of waves as they interact with objects or apertures.

To find the width of the central maximum in a single-slit diffraction pattern, we can use the formula:

\(w = ({\lambda * D) / a\)

Where:

w is the width of the central maximum,

λ is the wavelength of light,

D is the distance between the slit and the screen, and

a is the width of the slit.

Given:

\(\lambda = 610 nm = 610 * 10^{(-9) m\) (converting from nanometers to meters)

\(D = 1.5 m\\a = 0.20 mm = 0.20 * 10^(-3) m\)(converting from millimeters to meters)

Substituting the values into the formula, we get:

\(w = (610 * 10^(-9) m * 1.5 m) / (0.20 * 10^(-3) m)\\w = 457.5 * 10^(-9) m / 0.20 * 10^(-3) m\\w = 457.5 * 10^(-9) m / 2 * 10^(-4) m\\w = 457.5 * 10^(-9) / 2 * 10^(-4) m\\w = 2.2875 * 10^(-5) / 2 * 10^(-4) m\\w = 0.114375 m\)

Converting the width to centimeters:

\(w = 0.114375 m * 100 cm/m\\w = 11.4375 cm\)

Therefore, the width of the central maximum is approximately 11.44 cm.

None of the given options match the calculated value exactly, but the closest option is A. 0.34 cm.

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Answer:

1)  10 kg-m/s

2)  2 kg

3)  20 m/s

Explanation:

The momentum of an object can be calculated using the equation:

\(\large\boxed{p=mv}\)

where:

\(\hrulefill\)

For this question we need to find the momentum of a bowling ball whose mass is 4.0 kg is rolling at a rate of 2.5 m/s.

Given values:

Substitute the given values into the momentum formula and solve for p:

\(p=4.0\;\text{kg} \cdot 2.5\;\text{m/s}\)

\(p=10\;\text{kg m/s}\)

Therefore, the momentum of the bowling ball is 10 kg-m/s.

\(\hrulefill\)

For this question we need to find the mass of a skateboard rolling at a velocity of 3.0 m/s with a momentum of 6.0 kg-m/s.

Given values:

As we want to find mass, rearrange the momentum formula to isolate m:

\(\large\boxed{m=\dfrac{p}{v}}\)

Substitute the given values into the formula and solve for m:

\(m=\dfrac{6.0\; \text{kg m/s}}{3.0\; \text{m/s}}\)

\(m=2\;\text{kg}\)

Therefore, the mass of the skateboard is 2 kg.

\(\hrulefill\)

For this question we need to find the velocity of a baseball with a mass of 0.5 kg and a momentum of 10 kg-m/s.

Given values:

As we want to find velocity, rearrange the momentum formula to isolate v:

\(\large\boxed{v=\dfrac{p}{m}}\)

Substitute the given values into the formula and solve for v:

\(v=\dfrac{10\; \text{kg m/s}}{0.5\; \text{kg}}\)

\(v=20\;\text{m/s}\)

Therefore, the velocity of the baseball is 20 m/s.

The primary current of transformer is 9A, the secondary voltage is 63.75 V and the output power at 85% efficiency is 650.25 VA.

(a) Turns of primary coil (N₁) = 400

Turns of secondary coil (N₂) = 300

Current on secondary coil (I₂) = 12 A

Current on primary coil (I₁) =

= using transformer equation,

= N₁ × I₁ = N₂ × I₂

= I₁ = (300 ×12) / 400

=  I₁ = 9 A

(b) Voltage of primary coil (V₁) = 85 V

Current on secondary coil (I₂) = 12 A

Power on primary coil (P₁) =

= P₁ = V₁ × I₁

= P₁  = 85 × 9

= P₁ = 765 VA

However, if the efficiency of the transformer is 85% then,

= 85 = (P₂ / P₁ ) × 100

= 0.85 × 765 = P₂

= P₂ = 650.25 VA

(c) Voltage of primary coil (V₁) = 85 V

Current on secondary coil (I₂) = 12 A

Current on primary coil (I₁) = 9 A

Voltage on secondary coil (V₂) =

= using transformer equation,

= I₁ × V₁ = N₂ × I₂

= V₂ = (85 × 9) / 12

= V₂ = 63.75 V

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The distance from fourth maximum to the central maximum is, y₄ = 3.2 cm

Diffraction is defined as the interference or bending of waves passing through an aperture around the corner of an obstacle or into the geometric shadow area of ​​the obstacle/aperture. Diffractive objects or apertures are secondary sources of propagating waves. It is the process by which a ray or other wave system widens as a result of passing through a narrow aperture or edge. It usually involves interference between the generated waveforms.

Given,

λ = 550 nm

y₃ = 3Dλ/d

y₃ = 3 cm

3Dλ/d = 3 cm

D/d = (3 × 10⁻²)/3λ

Since, λ = 550 nm

D/d = (3 × 10⁻²)/(3×550×10⁻⁹)

D/d = 10⁶/55

Now, λ = 440 nm

y₄ = 4Dλ/d

y₄ = 4 (440×10⁻⁹) 10⁶/55

y₄ = 3.2 cm

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The energy per photon associated with a frequency of 1260 kHz is 2.10×10^-25 J.

To calculate the energy per photon, we can use the equation: E = hf, where E represents the energy, h is the Planck's constant (6.62607015 × 10^-34 J·s), and f is the frequency of the photon. Given that the frequency is 1260 kHz, we need to convert it to hertz (Hz) by multiplying it by 10^3:

Frequency = 1260 kHz × 10^3 = 1.26 × 10^6 Hz

Now, we can substitute the values into the equation:

E = (6.62607015 × 10^-34 J·s) × (1.26 × 10^6 Hz)

E = 8.33929859 × 10^-28 J

The answer is given in scientific notation as 8.34 × 10^-28 J. However, the question specifically asks for the answer in the format of 0.00×10^0. To achieve this, we can multiply the result by 10^3 and adjust the exponent accordingly:

E = (8.33929859 × 10^-28 J) × (10^3)

E = 8.33929859 × 10^-25 J

Thus, the energy per photon associated with a frequency of 1260 kHz is 2.10×10^-25 J.

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Answer:

Look below

Explanation:

Units are very important. Let's say we were building an apartment. We used meters for every measurement except for 1 support where we used centimeters. This could lead to the collapse of the whole structure as the measurements were wrong. 100 meters and 100 centimeters are very different.

The unit of measurement is very important. A measurement tells us about the property of something. It tells us how heavy an object is, or how long an object is. A measurement gives us a number to that property.

A unit is any standard used for making comparisons in measurements. Unit conversions allow for measurements of a property that have been recorded using different units—for instance, centimetres to inches.

Units are important when measuring quantities because units allow people to communicate amounts uniformly in a way that can be understood by others.

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b) 6.83 years, which corresponds to approximately 2.165 years as measured by someone on the spaceship.

According to special relativity, time dilation occurs when an object is moving relative to an observer. Time dilation means that time appears to pass more slowly for the moving object compared to a stationary observer.

In this scenario, the spaceship is traveling at a speed of 0.9640c, which is 0.9640 times the speed of light. We want to find out how long the trip takes as measured by someone on the spaceship, which means we need to consider time dilation.

The time dilation factor, γ, is given by the equation:

γ = 1 / √(1 - (v^2 / c^2))

where v is the velocity of the spaceship and c is the speed of light.

Substituting the given values:

γ = 1 / √(1 - (0.9640c)^2 / c^2)

= 1 / √(1 - 0.9298)

= 1 / √(0.0702)

≈ 3.160

This means that time appears to pass approximately 3.160 times slower for someone on the spaceship compared to someone in the Earth's rest frame.

Now, let's consider the time it takes for the trip in the Earth's rest frame. We'll denote this time as t_earth.

Given that the spaceship takes t_earth to travel between the two planets as measured in the Earth's rest frame, the time it takes for someone on the spaceship, t_ship, can be calculated by:

t_ship = t_earth / γ

Substituting the provided answer options:

a) t_earth = 2.79 years

t_ship = 2.79 years / 3.160 ≈ 0.883 years

b) t_earth = 6.83 years

t_ship = 6.83 years / 3.160 ≈ 2.165 years

c) t_earth = 39.5 years

t_ship = 39.5 years / 3.160 ≈ 12.50 years

d) t_earth = 28.8 years

t_ship = 28.8 years / 3.160 ≈ 9.13 years

Based on the calculations, the correct answer is option b) 6.83 years, which corresponds to approximately 2.165 years as measured by someone on the spaceship.

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A car initially traveling at 15.0 m/s accelerates at a constant rate of 4.50 m/s2 over a distance of 45.0 m, the time taken to cover this distance  is mathematically given as

t = 2.24 s

Generally, the equation for Kinematic relation is mathematically given as

S = ut + (1/2)at^2

Therefore

45 = 15t + 2.25 t^2

2.25 t^2 + 15 t -45 = 0

t = 2.24 s

In conclusion, the time is taken to cover this distance

t = 2.24 s

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ANSWER

EXPLANATION

We want to find out how wings help a plane to fly.

The wings of an airplane are there to help lift the plane. They are shaped to make air move faster over the wings.

They are used for lifting, landing, turning and controlling the airplane. The curve on the wings make the air move faster than the air at the bottom of the wings which appropriates Bernoulli's principle to push the plane into the air.

Answer:

The forces are a convergent

Explanation:

The rise in temperature of the iron part of the machine is approximately 9.6°C.

Heat transfer is the movement of thermal energy from one object or system to another due to a temperature difference. Thermal energy, which is the energy associated with the motion of particles within a substance, always moves from higher temperature regions to lower temperature regions until thermal equilibrium is achieved.

To calculate the rise in temperature of the iron part of the machine, we can use the following formula:

Q = m × c × ΔT

where Q is the heat absorbed by the iron part of the machine, m is the mass of the iron part, c is the specific heat capacity of iron, and ΔT is the rise in temperature.

First, we need to calculate the heat generated by the machine in 2 minutes, using its input power and efficiency:

P = 2 kW

Efficiency = 80% = 0.8

t = 2 minutes = 120 seconds

Energy generated by the machine = P × t × efficiency

Energy generated by the machine = 2 kW × 120 s × 0.8

Energy generated by the machine = 192 kJ

Next, we can calculate the mass of the iron part of the machine using its density:

Density of iron = 7.87 g/cm³ = 7870 kg/m³

Mass of iron part = 40 kg

Now, we can substitute the values into the formula and solve for ΔT:

Q = m × c × ΔT

ΔT = Q / (m × c)

ΔT = 192000 J / (40 kg × 500 J/kgK)

ΔT = 9.6°C

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The given options to the question must also include 9.6°C.

Coal, and oil are fossil fuels they are non - renewable. Nuclear sources are alo non renewable energy since they are unstable and hazardous to the environment and thus are difficult to manage for an efficient energy generation.

Renewable energy sources are those which can reproduced and will be long lasting over time. Whereas non renewable resources like fossil fuels  and nuclear sources are not at all recycled. Moreover they causes harmful effects to the environment.

Waste from coal or natural gas production necessitates the use of surplus energy and environmental mitigation. Considering these variables, it is evident that coal's overall usable energy efficiency is just 29% of its initial energy value.

Solar energy is the better alternative as a renewable energy source.Wind, on the other hand, rates at 50% efficiency. Wind energy sometimes has a higher efficiency than this %. And using wind energy doesn't produce any pollution as solar energy.

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Yes, lack of sleep make injuries heal slower. Sleep helps in healing injuries  by regulating the proper blood flow on all over the body.

At the point when you fall asleep, you're giving your body time to fix and recuperate from the day's exercises. In a review with an emphasis on more youthful competitors, research has shown that people need the prescribed measures of rest to recuperate completely. The review's discoveries inferred that there was an association between how much rest youthful competitors had and their penchant for a likely physical issue.

The investigation discovered that youthful competitors who dozed under eight hours out of each night were almost 1.7 times bound to have a physical issue.

Indeed, even a couple of hours to a great extent can radically affect the possible gamble for injury, as a similar report revealed that 65% of competitors who got under 8 hours of rest were more injury-inclined than the 31% of competitors who detailed they got over 8 hours of the evening.

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Answer:

1:a

2:c

3:f

4:d

5:f or e

6:d

Explanation:

Hope it helps! also if im wrong sorry. but i already learned this so yeah have a nice day!

The Fluorescent light would save $ 28125 in electricity over its 10,000hour lifespan.

The characteristic or state of being intense especially: excessive degree of vigor, force, energy, or sensation the magnitude of a quantity (such as force or energy) per unit (as of area, charge, mass, or time).

Given that compact fluorescent lamps consume around 25% of the energy that incandescent bulbs do.

As a result, the comparable energy for a 100W bulb is:

25% of 25W = 0.2525 = 6.25W Fluorescent bulb

Because the rates are $0.15/kW-hour, for a 10000 hour lifetime:

Total charges for incandescent = 6.25W×100000 hours ×$0.15/kW-hour

= $9375

Total Fluorescent charges =25W ×100000 hours ×$0.15/kW-hour

= $37500

As a result, the money saved on electricity is = $37500 - $9375

= $28125.

As a result, $28125 in power would be saved throughout the Fluorescent bulb's 10,000hour lifespan.

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Answer: 4K1

Explanation:

Answer:

Educational institutions can influence what psychological perspectives are taught, studied, and researched. Take, for example, behaviorism. Before the cognitive perspective re-emerged, behaviorism was the dominant perspective being taught in most universities. Personal ideology can also affect which perspective a psychologist supports, the course of research a psychologist undertakes, and also a psychologist's perception and interpretation of research findings. For example, during the dominance of behaviorism, psychologists were discouraged from studying cognitive processes. As a result, much of the research conducted had a behaviorist slant to it.

Explanation:

Distance:

IF IT WAS TOSSED STRAIGHT UP:

UP: from 1.5m to 5m . . . . . 3.5 m

DOWN: from 5m to the ground ... 5 m

Total distance . . . 8.5 m

Displacement:

IF IT WAS TOSSED STRAIGHT UP:

from 1.5m to the ground.

Displacement = 1.5m down

Distance is the total path travelled by an object and here, distance travelled by the ball is 11.5 m.

Displacement is the shortest distance between two points and here, the displacement of the ball is -1.5 m.

The answer can be explained as follows:

After the throw;

During upward motion of the ball:

During downward motion of the ball:

For calculating displacement;

(Final position is ground, and since all measurements are measured from ground, position of ground is treated as 0 m)

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Answer:

It gets higher

Explanation:

The shorter it is, the higher the frequency.

The effect of weather and climate on the picture is erosion. The 3 potential solutions to the erosion are Planting of a cover crop, Build Terraces, and Create diversions to Help Drainage.

Erosion is defined as the washing away of the topmost portion of the soil which can occur due to natural causes or through the activities of man.

The natural causes of erosion is related to changes in weather and climate through rain, rivers, floods, lakes, and the ocean.

The three potential solutions to the problem of erosion include the following:

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Answer:

5ms^-2

Explanation:

F = 20N, m = 4.0kg, a = ?

Using the formula for Force

F = ma

Then making acceleration the subject of the formula

a = F/m

a = 20N/4.0kg

a = 5ms^-2

The angular distance that the pie plate has moved through is approximately:- 5.91 revolutions- 37.18 radians- 2129 degrees

The circumference of the pie plate can be calculated as:

C = πd = π(8.5 in) ≈ 26.7 in

To find the angular distance that the pie plate has moved through, we need to know the fraction of a complete revolution that corresponds to a linear distance of 158 in on the circumference of the pie plate. We can use the formula:

θ = s / r

where:

θ = angular distance in radians

s = linear distance

r = radius

The radius of the pie plate is half of the diameter, or:

r = 8.5 in / 2 = 4.25 in

Using this radius and the given linear distance, we get:

θ = s / r = 158 in / 4.25 in ≈ 37.18 radians

To convert radians to revolutions, we can use the fact that 1 revolution is equivalent to 2π radians:

θ = 37.18 radians = 37.18 / (2π) revolutions ≈ 5.91 revolutions

To convert radians to degrees, we can use the fact that 180 degrees is equivalent to π radians:

θ = 37.18 radians = (37.18 radians) * (180 degrees / π radians) ≈ 2129 degrees.

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The initial velocity of the train is 20m/s when the train decelerates uniformly at a rate of 2m/s2. It means that initially, at time = 0 seconds, the train was moving with a velocity of 20m/s.

We know that,

v = u +at

where, v = final velocity

u = initial velocity

a = acceleration

t = time taken

In this case, as the train is decelerating we will use a negative sign with acceleration.

Substituting the values we get,

v = u + (-2)(10)

v will be equal to zero, as the train comes to a stop.

0 = u - 20

u = 20 m/s

Hence, the initial velocity of the train is 20m/s when the train decelerates uniformly at a rate of 2m/s2 and comes to a stop in 10 seconds.

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Answer: \(36.22\ V\)

Explanation:

Given

Energy in a capacitor \(E=7.77\times 10^{-7}\ J\)

Charge \(Q=4.29\times 10^{-8}\ C\)

Energy of a capacitor is given by

\(E=\dfrac{1}{2}CV^2=\dfrac{1}{2}QV\quad [\text{Q=CV}]\)

Insert the values

\(E=\dfrac{1}{2}QV\\\\\Rightarrow 7.77\times 10^{-7}=\dfrac{1}{2}\times 4.29\times 10^{-8}\times V\\\\\Rightarrow V=3.622\times 10\\\\\Rightarrow V=36.22\ V\)

Thus, the voltage around the capacitor is \(36.22\ V\)

Answer:

\(\boxed {\boxed {\sf 1337.7 \ Joules}}\)

Explanation:

We are asked to find the gravitational potential energy at the highest point in the jump.

Gravitational potential energy is the energy an object possesses due to its position in a gravitational field. It is calculated using the following formula:

\(GPE= m \times g \times h\)

The mass of the jumper is 65 kilograms and they reach a height of 2.1 meters. Assuming this situation is occurring on Earth, the acceleration due to gravity is  9.8 meters per second squared.

Substitute the values into the formula.

\(GPE = 65 \ kg \times 9.8 \ m/s^2 \times 2.1 \ m\)

Multiply the numbers together.

\(GPE=637 kg*m^2/s^2 \times 2.1 \ m\)

\(GPE=1337.7 \ kg*m^2/s^2\)

Convert the units. 1 kilogram meter squared per second squared is equal to 1 Joule, so our answer of 1337.7 kg*m²/s² is equal to 1337.7 J.

\(GPE= 1337.7 \ J\)

The gravitational potential energy at the highest point in the jump is 1337.7 Joules.