The periodic wave in the diagram below has a frequency of 40 hertz. What
is the speed of the wave?

answers:
A. 120 m/s
B. 60 m/s
C. 27 m/s
D. 13 m/s

When physicists find a quantity that does not change, they say that the quantity is conserved. Conservation laws are fundamental to physics, and they are based on the principle of the conservation of energy, mass, and momentum. These laws state that these quantities cannot be created or destroyed, only transferred from one system to another.

For example, the law of conservation of energy states that the total energy of a closed system remains constant over time, meaning that energy cannot be created or destroyed, only transferred from one form to another. This principle applies to all forms of energy, including thermal, kinetic, potential, and electromagnetic. The conservation of mass and momentum are also essential principles in physics, which state that the total mass and momentum of a closed system remain constant over time. The concept of conservation is critical in physics because it allows us to predict and understand the behavior of physical systems and the laws that govern them.

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The aggregate bulk dry specific gravity, the aggregate apparent specific gravity, the moisture content of stockpile aggregate and absorption are respectively,

A. 2.7

B. 2.72

C. 1.6%

D. 0.21%

A) The formula for the aggregate bulk dry specific gravity is:

Aggregate bulk dry specific gravity = Mass of oven dried aggregate /( Mass of saturated surface dry aggregates - Submerged mass of aggregate)

Placing the values from the data we have,

Aggregate bulk dry specific gravity = 5216/ (5227 - 3295) = 2.7

B) Formula for aggregate apparent specific gravity is

Mass of oven dried aggregate/ ( Mass of oven dried aggregate - Submerged mass of aggregate) = 5216/ (5216 - 3295) = 2.7

C) The moisture content of the stockpile aggregate is

m = (weight of moist aggregate - mass of oven dried aggregate) / (mass of oven dried aggregate* 100%)

m = (5298 - 5216)/ (5216* 100%) = 1.6 %

D) Absorption is calculated as A = (5227 - 5216) / (5216) * 100% = 0.21 %

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The relative intensity of sound produced by the tuning fork will be higher when detected by plugged ears, and lower when detected by unplugged ears.

When detected by plugged ears, the intensity of sound produced by the tuning fork will be higher due to the fact that the sound waves are unable to escape and are instead reflected back into the ear canal. This is because the ear canal is blocked off, creating a closed system and thus more intense sound waves.

Conversely, when detected by unplugged ears, the intensity of sound produced by the tuning fork will be lower as the sound waves are able to escape the ear canal. This is because the ear canal is open, creating an open system and thus less intense sound waves.

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The loss of body heat involving the transfer of heat from the surface of one object to the surface of another without physical contact is called radiation.

Radiation is a type of heat transfer that occurs through electromagnetic waves. In the case of the human body, radiation can occur when the body is in close proximity to colder objects or surfaces. This type of heat loss can happen even when the air temperature is relatively warm. For example, on a sunny day, a person may feel cooler when standing in the shade because the body is losing heat through radiation to the cooler shaded area.
It is important to be aware of radiation as a potential cause of heat loss and take appropriate measures to stay warm in cold environments. Wearing protective clothing and staying in warm areas can help reduce the amount of heat lost through radiation.
In summary, radiation is the transfer of heat from the surface of one object to the surface of another without physical contact and can result in the loss of body heat.

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Answer:

Most of UV radiation is stopped by glass & this is why you will not get sunburns behind a glass. The glass simply filters out the UV radiation that is responsible for the sunburns & protect your skins from these energetic & somewhat harmful radiation

Explanation:

Answer:

scalar d = 54000 m , v_average = 16,667 m / s

vector    d = -4000 m , moved 4000 to the west

                 v_average = 0                

Explanation:

his is a uniform motion exercise, but we must be careful with quantities that are scalars and vector quantities

The distance traveled is a scalar

       d = d₁ + d₂

       d = 25000 + 29000

       d = 54000 m

the speed is a scalar, in the exercise it is not specified if the speed of each trajectory or the average speed. Therefore we will calculate the two

       v₁ = d₁ / t₁

       v₁ = 25000/1500

       v₁ = 16,667 m / s

       v₂ = 29000/1740

        v₂ = 16,667 m / s

Since the two speeds are equal, the average speed is

       v = (v1 + v2) / 2

       v_average = 16,667 m / s

now let's calculate the displacement that is a vector, so it has direction in addition to modules

suppose the eastward direction is positive and the bold are vectors

      d = d₁ - d₂

       d = 25000 - 29000

        d = -4000 m

this means that it moved 4000 to the west

velocity is a vector, we assume positive eastward movement

        v₁ = 16,667 m / s

         v₂ = - 16,667 m / s

         v_average = (v1 -v2) / 2

         v_average = 0

A 25.5 kg video cart is rolled down a hallway. It is accelerated at 0.12 m/s2. If a force of 30 N is applied to move the cart . The wheels have 26.4 N  force of friction against the floor

Force of friction is that force  that resists the sliding or rolling of one solid object over another

F(applied) - friction = F net

30 - fr = mass * acceleration

30 - fr  = 25.5  *  0.12  

fr = 30 - 3.06

  = 26.4 N

The wheels have 26.4 N  force of friction against the floor

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Answer:

1.6 An iron is supplied with a current of 3 A from the mains. The resistance of the iron is 100 Ω. Calculate the power of the iron. [2

Answer:

Shiny and smooth surfaces reflect light best

Explanation:

Answer:

Fluid theories of electricity are outdated theories that postulated one or more electrical fluids which were thought to be responsible for many electrical phenomena in the history of electromagnetism.

I hope it's helpful!

(a) The gravitational force received by each 1 kg mass is 8.66 N.

(b) The magnitude of gravitational acceleration is 8.66 m/s².

(c) The orbital speed of the ISS is  7,663.6 m/s.

(d) The time take  for the ISS to orbit round the Earth is 5,558.75 seconds which is equal to 1.54 hours.

The gravitational force received by each 1 kg mass is calculated as follows;

F = Gm₁m₂/r²

where;

F = (6.67 x 10⁻¹¹ x 5.97 x 10²⁴ x 1) / (6780,000)²

F = 8.66 N

mg = GMm/r²

g = GM/r²

where;

g = (6.67 x 10⁻¹¹ x 5.97 x 10²⁴ ) / (6780,000)²

g = 8.66 m/s²

v = √GM/r

v = √(6.67 x 10⁻¹¹ x 5.97 x 10²⁴  / 6780,000)

v = 7,663.6 m/s

T = 2πr/v

T = (2π x 6780,000) / (7663.6)

T = 5,558.75 seconds

1 hour = 3600 seconds

=  5,558.75/3600

= 1.54 hours

Thus, the gravitational force received by each 1 kg mass is 8.66 N.

The magnitude of gravitational acceleration is 8.66 m/s².

The orbital speed of the ISS is  7,663.6 m/s.

The time take  for the ISS to orbit round the Earth is 5,558.75 s = 1.54 hours.

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Answer: A.

current (thumb) to magnetic field (fingers)

Answer:

A. current (thumb) to magnetic field (fingers)

Explanation:

According to the Right-Hand Thumb rule, if we are holding a current- carrying straight conductor in our right hand such that the thumb points toward the direction of current, then the fingers will wrap around the conductor in the direction of the field lines of the magnetic field.

Hope it helps.

If you have any query, feel free to ask.

The height of the pendulum bob above the lowest point (0), where its velocity is zero, is approximately 2.046 meters

To calculate the height of the pendulum bob above the lowest point (0) where its velocity is 0, we can use the principle of conservation of mechanical energy.

Given:Maximum speed of the pendulum bob = 4.5 m/s

The lowest point (0) represents the reference point for height measurements.

At the lowest point (0), the pendulum bob has maximum kinetic energy and zero potential energy. As the pendulum bob swings upwards, it loses kinetic energy and gains potential energy. At the highest point, its potential energy is maximum, and its kinetic energy is zero.The total mechanical energy (E) of the pendulum bob remains constant throughout its motion:E = Kinetic energy + Potential energy. At the lowest point (0), the entire energy is in the form of kinetic energy, given by: E_lowest = Kinetic energy_lowest .E_lowest = (1/2)mv^2, where m is the mass of the bob and v is the velocity at the lowest point.At the highest point where the velocity is zero, the entire energy is in the form of potential energy: E_highest = Potential energy_highest

E_highest = mgh, where m is the mass of the bob, g is the acceleration due to gravity, and h is the height above the reference point (0). Since the mechanical energy is conserved, we can equate the energies at the lowest and highest points: (1/2)mv^2 = mgh

Simplifying and solving for h:

h = (v^2) / (2g)

Substituting the given values:

v = 4.5 m/s (maximum speed)

g = 9.8 m/s^2 (acceleration due to gravity)

h = (4.5 m/s)^2 / (2 × 9.8 m/s^2)

h = 2.046 m.

Therefore, the height of the pendulum bob above the lowest point (0), where its velocity is zero, is approximately 2.046 meters.

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Answer:

0.2597hertz

Explanation:

first of all we have to calculate time.

time is given by speed/distance

hence=30.67/7.96

=3.85s

frequency is given by 1/time

=1/3.85

=0.2597hertz

Answer:

Density= 2.78 g/cm³

Relative density=2.8

Explanation:

To calculate the density of the cube we have to use the formula ρ=mass/volume

ρ stands for density.

So now we don't have the volume of the cube and to find the volume of the cube we have to use the formula a³

3³= 9 cm³

Now plug in the values. ρ= 25 g/9 cm³

ρ= 2.78 g/cm³

To find the relative density, we have to use the formula ρsample/ρH20

The sample means the density of the substance earlier. We do not know the density of water but it is constant at 997 kg/m³.

Now we have to make the units same so you change the unit of the density of cube to kg/m³

So, 25/1000= 0.025 kg

9/100×100×100 (because cm³ which means that there should be 3 meters to change the unit and to conver cm to meter we need to divide by 100 so 9cm/100, 9cm²/100×100, 9cm³/100×100×100)

=0.000009 m³

The new density= 0.025 kg/ 0.000009 m³

= 2777.78 kg/m³

Now plug the values into the formula:

relative density= 2.777.78 kg/m³ / 997 kg/m³

=2.8

There is no unit since kg/m³ and kg/m³ cancels

Answer:

"Faster" is most likely the answer, I'm not 100% sure though

d) When a steel rod wrapped in a current-carrying wire turns the rod into a strong magnet.

By wrapping the current-carrying wire like a solenoid, A steel bar placed in a solenoid coil becomes a permanent magnet. A solenoid is a coil of wire designed to create a strong magnetic field within the coil. If the same wire is wrapped many times around a cylinder, say a steel cylinder, the magnetic field from the wire can become very strong. The number of turns refers to the number of loops a magnet has. The more loops, the stronger the magnetic field. Thus, the steel rod will turn into a strong magnet by wrapping it with a current-carrying wire.

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Answer:

The answer will be 90

Explanation:

30N×3m= 90

Answer:

Orbit/circumference = 471.24 million .

c = 2πr

150/2 = radius

radius = 75.

π = 3.14

2 x π x 75 = 471.24

Answer:

The bonds can shift because valence electrons are held loosely and move freely.

Explanation:

Ill put the rest of the answers in the comments

Answer:

The bonds can shift because valence electrons are held loosely and more freely.

Answer:

we have to use the formula f=ma to find out the unknown force

Explanation:

mass = 9kg

accelration=3m/s^2

force = mass * acceleration

force = 9 * 3

force = 27 N(newton)

Answer:

An open circuit is one where the continuity has been broken by an interruption in the path for current to flow. A closed circuit is one that is complete, with good continuity throughout

The rate of heat rejection from the condenser in kW is 9.305 kW, compressor power in kW is 9.305 kW, and the coefficient of performance would be 1.

Determining heat rejection, compressor power, and coefficient of performance:

(a) To find the rate of heat rejection from the condenser, we can use the equation Q_out = m_dot*h_out - m_dot*h_in, where Q_out is the heat rejected, m_dot is the mass flow rate, h_out is the enthalpy leaving the condenser, and h_in is the enthalpy entering the compressor. We can find the enthalpies using the refrigerant tables for 134a.

At the compressor inlet, the refrigerant is saturated vapor, so the enthalpy is h_in = 292.87 kJ/kg.
At the condenser outlet, the refrigerant is saturated liquid, so the enthalpy is h_out = 311.48 kJ/kg.

Plugging in the values, we get:
Q_out = (0.5 kg/s)(311.48 kJ/kg - 292.87 kJ/kg) = 9.305 kW

Therefore, the rate of heat rejection from the condenser is 9.305 kW.

(b) To find the compressor power, we can use the equation W_compressor = m_dot*(h_out - h_in). Plugging in the values, we get:
W_compressor = (0.5 kg/s)(311.48 kJ/kg - 292.87 kJ/kg) = 9.305 kW

Therefore, the compressor power is 9.305 kW.

(c) The coefficient of performance (COP) is defined as the ratio of the heat removed from the refrigerated space to the work input to the system. We can calculate it using the equation COP = Q_out/W_compressor. Plugging in the values, we get:
COP = 9.305 kW / 9.305 kW = 1

Therefore, the coefficient of performance is 1. This means that for every 1 kW of work input, the system removes 1 kW of heat from the refrigerated space.

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Answer:

Explanation:

Given: q₁ = q₂,

F= 10 N,

distance between two charges, r = 30000 m.

We have, \(F = \frac{q_{1} q_{2} }{4\pi Er^{2} }\)

Hence, \(q_{1} q_{2} =F * 4\pi *E *r^{2}\)

E (epsilon) =\(8.85 * 10^{-12} C^{2} /Nm\)

Substituting the values, we have,

\(q_{1} q_{2} = 1 C\)

Hence \(q_{1} = q_{2} = 0.5 C\)

d = -1 m

The negative sign indicates that the charge from that force of the space of the two spheres.

When charged matter is exposed to an electromagnetic field, its electric charge—a property of matter—causes it to feel a force. An electric charge can be either positive or negative (commonly carried by protons and electrons respectively). Like and unlike charges are attracted to one another while being repelled by the other. Neutral describes a thing without any net charge. Classical electrodynamics, a term coined to describe early understanding of the interactions of charged particles, is still applicable to issues that do not demand for taking quantum effects into account.

The net charge, or the total of the positive and negative charges, is constant in an isolated system because electric charge is a conserved attribute. Electrical charge is transported by subatomic particles.

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Answer:

learning and memory are very closely related concept . Learning is the acquisition of silk or knowledge, while memory is the expression of what you've acquired.Another difference is the speed with which the two things happen if you acquire the new skill or knowledge slowly and laboriously, that's learning

Answer: I took a test that had this question and the answer was Memory is the foundation of all learning. I hope this helps

The kinetic energy of the electron in electron volts (eV) after moving through a potential difference of 28 volts is approximately 28 eV.

The kinetic energy of an electron can be calculated using the equation:

Kinetic Energy (KE) = qV

Where q is the charge of the electron and V is the potential difference.

The charge of an electron is approximately -1.6 x 10⁻¹⁹ coulombs.

Given that the potential difference is 28 volts, we can substitute the values into the equation:

KE = (-1.6 x 10⁻¹⁹ C) * (28 V)

Simplifying the calculation:

KE ≈ -44.8 x 10⁻¹⁹ J

To convert the energy to electron volts (eV), we can use the conversion factor:

1 eV= 1.6 x 10⁻¹⁹ J

Therefore:

KE ≈ (-44.8 x 10⁻¹⁹ J) / (1.6 x 10⁻¹⁹ J/eV)

KE ≈ -28 eV

Since kinetic energy is always positive, we can disregard the negative sign and state that the kinetic energy of the electron is approximately 28 eV.

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The input voltage of a transformer must be AC (alternating current) because transformers rely on the property of AC for effective electromagnetic induction, which is essential for their operation.

Electromagnetic induction occurs when a varying magnetic field induces an electric voltage in a conductor. In the case of a transformer, an alternating current passing through the primary coil generates a changing magnetic field, which, in turn, induces a voltage in the secondary coil.

AC is particularly well-suited for this process due to its constant change in direction, resulting in a continuously fluctuating magnetic field. This dynamic magnetic field induces a voltage in the secondary coil, facilitating efficient energy transfer from the primary coil to the secondary coil.

Conversely, if a transformer were to be powered by DC (direct current), the magnetic field produced by the unidirectional current would remain constant. As a result, there would be no continuous alteration in the magnetic field to induce a voltage in the secondary coil, severely limiting the transformer's functionality.

Hence, the utilization of AC input voltage is critical for transformers as it enables efficient energy transfer and voltage transformation between various circuits or power systems.

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