Which of the following statements regarding waves approaching a coast is FALSE?

a. Wave crests increase in height when approaching the beach.
b. Waves speed up when approaching the beach.
c. Wave crests bunch closer together when approaching the beach.
d. Approaching wave crests align parallel with the coastline in what is known as wave refraction.

Answer:

C

Explanation:

When the frequency of sound changes, we hear a change in pitch. When the frequency of light changes we see a change in color.

Answer:

they have same acceleration 2m/s^2

Explanation:

a =v-u/t

65-60/2.5

2m/s^2

a) The acceleration of the car and the bicycle are equal since \(\delta V\) for both vehicle is 5km/h and the time taken for both vehicle is also the same 2.5s.

b) The acceleration of the bicycle is 0.556m/s²

Given the data in the question;

Since the bicycle starts from rest

a)

The acceleration of the car and the bicycle are equal since \(\delta V\) for both vehicle is 5km/h time taken for both vehicle is also the same 2.5s.

b)

The acceleration of each vehicle

To determine the acceleration for car and the bicycle, we use the first equation of motion:

\(v = u + at\)

Where v is the final velocity, u is the initial velocity, a is the acceleration and t is the time.

Now, For the car;

\(18.0556m/s = 16.667m/s + ( a + 2.5s )\\\\a = \frac{18.0556m/s - 16.667m/s }{2.5} \\\\a = \frac{1.3886m/s}{2.5s} \\\\a = 0.556 m/s^2\)

Hence, the acceleration of the car is 0.556m/s²

For the bicycle;

\(1.38889m/s = 0 + ( a * 2.5s )\\\\a = \frac{1.38889m/s}{2.5s}\\\\a = 0.556m/s\)

Hence, the acceleration of the bicycle is 0.556m/s²

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If a vehicle starts to skid on water (hydroplane), the driver should ease off the accelerator, brake gently and gently steer back onto the pavement True.

If a vehicle starts to skid on water (hydroplane), it means that the tires have lost contact with the road and are riding on a thin layer of water, resulting in a loss of traction and control. To regain control of the vehicle, the driver should ease off the accelerator to reduce the speed, and gently steer the vehicle back onto the pavement.

Braking should be done gently, as sudden braking can cause the wheels to lock up and increase the risk of a spin-out or loss of control. It is important for drivers to stay calm and focused during hydroplaning to avoid accidents.

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True. To restore control, the driver should gradually release the gas, softly use the brakes and turn the car back onto the roadway.

This is due to the fact that hydroplaning makes it challenging to regulate the direction and speed of the vehicle since it happens when the tyres lose contact with the road due to a layer of water. If the brakes are used too firmly, the wheels may lock up and the skid will worsen. To regain control of the vehicle, it is crucial to avoid making abrupt moves and instead make small adjustments. Additionally, keeping adequate tyre tread depth and the right tyre pressure might aid in avoiding hydroplaning altogether.

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Answer:

86.4 m  horizontal from landing spot

Explanation:

Find out how long before the ball hits the ground

 vertical speed  of ball = -2  m/s     gravity = - 9.81 m/s^2

find time to hit ground from 100 m  

          ( height will be zero when it hits the ground)

0 =  100  - 2 t  - 1/2 ( 9.81) t^2

        use Quadratic Formula to find t = 4.32 seconds

              horizontal speed of ball = 20 m/s  

in 4.32 seconds it will travel horizontally   20  m/s * 4.32 s = 86.4 m

F=ma

Newton's second law states that force is proportional to what is required for an object of constant mass to change its velocity. This is equal to that object's mass multiplied by its acceleration. We use Newtons, kilograms, and meters per second squared as our default units, although any appropriate units for mass (grams, ounces, etc.) or velocity (miles per hour per second, millimeters per second2, etc.) could certainly be used as well - the calculation is the same regardless.

The statements which are correct about calculating LaToya's mechanical advantage are—The input force is 50 N, the output force is 450 N and the mechanical advantage is 10.Therefore, the correct option is A, D and E.

Mechanical advantage is the ratio of output force to input force. In this case, LaToya is using a force of 50 N to pull a cart that weighs 500 N. The output force is the weight of the cart minus the force LaToya exerts on it:

Output force = 500 N- 50 N = 450 N

To see why statement F is incorrect, note that the formula for mechanical advantage is:

Mechanical advantage = output force / input force

Substituting the values we found earlier, we get:

Mechanical advantage = 450 N / 50 N = 9

So the mechanical advantage is actually 9, not 100.

Therefore, the correct option is A, D and E.

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Answer:

A particle that has the same charge as lambda baryon is a neutron.

Explanation:

A lambda baryon is a subatomic particle that is made up of three quarks - uds (up, down and strange). It contains the same number of protons and neutrons, and an isotopic spin of 1. It is a family of hadrons just like mesons.

A quark is a fundamental or basic particle that make up a matter. It can combine with two or more to form composite particles (e.g neutron or proton). These basic particles are held by a very strong attractive force. The composite particles are the constituents of the nucleus of an atom.

The particle that has the same electric charge as the lambda baryon is neutron.

The lambda is known to be a baryon that  is composed of three quarks. They are:

The neutron is known to be a kind of subatomic particle that is often written as n or n⁰ . It is known to have a neutral charge and its composition is that of 1 up quark and 2 down quarks.

See full question below

The lambda baryon has the quark composition uds. Which particle has the same electric charge as the lambda baryon?

1. neutron

2 electron

3. proton

4 antimuon

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The action-reaction pair of forces in this scenario is:The gravitational force exerted by the Earth on the book (weight of the book) and the gravitational force exerted by the book on the Earth.

According to Newton's third law of motion, for every action, there is an equal and opposite reaction. In this case, the book exerts a downward force on the Earth due to its weight, and in response, the Earth exerts an upward force on the book.

The weight of the book is 10 Newtons, and the Earth exerts an equal and opposite force of 10 Newtons on the book. This action-reaction pair of forces allows the book to stay at rest on the table, as the upward force from the table balances the downward force of gravity.

It's important to note that the weight of the book and the normal force from the table are not an action-reaction pair since they act on different objects (the book and the table, respectively). The action-reaction pair always involves two forces acting on two different objects.

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If a book’s weight exerts a force on a table and the table exerted a normal force, is it an action-reaction pair?

Answer: The Coriolis effect results in bending the direction of surface currents to the right in the Northern Hemisphere and left in the Southern Hemisphere. The Coriolis effect causes winds and currents to form the circular patterns. The direction in which they spin depends upon the hemisphere in which they are present.Coriolis Effect is named after the French mathematician and physicist Gaspard-Gustave de Coriolis. It affects the weather patterns of an area, it affects the ocean currents, and it also affects air quality.

If an electron vibrates back and forth in an clean wire with a frequency of 60.0 Hz, then it will make 2.2×10⁵ cycles. in 1.0 h. Hence option D is correct.

Electric charge is the physical property of matter that experiences force when it is placed in electric field. F = qE where q is amount of charge, E = electric field and F = is force experienced by the charge. there are two types of charges, positive charge and negative charge which are generally carried by proton and electron resp. like charges repel each other and unlike charges attract each other. the flow charges is called as current. Elementary charge is amount of charge a electron is having, whose value is 1.602 x 10⁻¹⁹ C

Amplitude is a measure of loudness of a sound wave. More amplitude means more loud is the sound wave.

Wavelength is the distance between two points on the wave which are in same phase. Phase is the position of a wave at a point at time t on a waveform. There are two types of the wave longitudinal wave and transverse wave.

Frequency is nothing but the number of oscillation in a unit time.

Given,

frequency f = 60.0 Hz.

time t = 1.0 h = 60*60 = 3600s

F = number of cycles/time

number of cycles = F×time

The number of cycles in 1 Hr is

60*3600 = 2.2×10⁵ cycles.

Hence option D is correct.

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Answer:

What happens is that light slows down when it passes from the less dense air into the denser glass or water. This slowing down of the ray of light also causes the ray of light to change direction.

Explanation:

Answer:

Originally Sonu and image is 8 m (4 m to mirror and 4 m to image)

If he moves 1 m towards the mirror the image distance will be reduced to  (c) 6 m

Answer:

a. same

b. less

c. less

Explanation:

you can use the position, time, acceleration equation

xf=xi + vi*t+(at^2)/2

you can say the final distance will greater for X than Y

using acceleration for gravity a=9.81m/s^2

a.  both X and Y will have the same acceleration due to gravity

b. to solve for final speed vf=vi+gt

since the initial velocity is 0 and X will take longer to fall, Y will hit the ground with less speed

c. as mentioned before, X will take longer to fall; therefore Y will have less time of descent.

The intensity of an electromagnetic wave with a peak electric field strength of 122 V/m is approximately 1.195 × \(10^(-5)\) W/m².

The intensity of an electromagnetic wave represents the amount of energy transported per unit area perpendicular to the direction of wave propagation. It is determined by the square of the peak electric field strength (E₀) of the wave. In this case, the given peak electric field strength is 122 V/m.

To calculate the intensity, we use the formula: Intensity = (1/2) * ε₀ * c * E₀². Here, ε₀ represents the vacuum permittivity, which is approximately 8.854 × \(10^(-12)\) F/m, and c is the speed of light, approximately 3 × 10^8 m/s.

Substituting the given values into the formula, we have: Intensity = (1/2) * (8.854 × \(10^(-12)\) F/m) * (3 × 10^8 m/s) * (122 V/m)². By calculating this expression, we find that the intensity is approximately 1.195 × \(10^(-5)\)W/m².

Therefore, the electromagnetic wave with a peak electric field strength of 122 V/m has an intensity of approximately 1.195 × 10^(-5) W/m². This value represents the power per unit area carried by the wave and is an important parameter for understanding the energy distribution of electromagnetic radiation.

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If he passes the ball with a velocity vector v BP relative to himself, and v BP has a value of 7 m/s, then the least angle it can have is 32.5 °.

A player runs at a speed relative to field is  v1  = 5.9 m/s

A player runs at a speed relative to himself  is  v2  = 7 m/s

                v  = v_1 +v_2

                     = 5.9 m/s + 7.0 m/s

                       = 12.9 m/s

smallest angle by  which the player hits the ball is θ  = cos^-1 ( 5.9 / 7.0)

                                                                                           = 32.5 degrees

Velocity is the rate at which an object is changing position when it is observed from a certain point of view and as measured by a particular unit of time. It is defined as the direction at which an object is traveling. Speed is the rate of movement along a path in contrast to velocity, which specifies the direction and speed of an object's motion.

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The thing which would happen if the weight of people increased on a roller coaster is that it will make it harder for it to slow down.

This is referred to as the force acting on the object due to gravity and it is denoted as W= mg where m is mass and g is acceleration due to gravity.

We should note that the larger the mass, the larger the momentum, and the more force you need to change it. Weight however does not make a roller coaster go faster but it does make it harder to slow down which is therefore the reason why it was chosen as the correct choice.

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Answer:

D

Explanation:

Answer:

the handle

Explanation:

The heavier car descends first because its rotational inertia (wheels) account for a greater proportion of its mass.

The roller coaster car's mass is unrelated to speed, so doubling the mass would have no impact on the speed of the vehicle. The car with twice the mass will therefore travel at the same speed from top to bottom.

The momentum of an object in motion is calculated by dividing its mass by its speed. An item has a lot of momentum if its mass or speed is greater than 1. A fast-moving car has more momentum than a slow-moving one because they have the same mass.

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False. Hydrostatic pressure force does not always act on the centroid of the area.

The statement that hydrostatic pressure force always acts on the centroid of the area is false. Hydrostatic pressure is the pressure exerted by a fluid at rest due to the weight of the fluid above it. It depends on the depth and density of the fluid and is perpendicular to any surface it acts upon.

When considering a submerged surface, such as a submerged plate or wall, the hydrostatic pressure force is indeed applied normal to the surface. However, this force does not necessarily act at the centroid of the area. The distribution of hydrostatic pressure forces depends on the shape and orientation of the surface.

For irregularly shaped surfaces or surfaces with varying depths, the hydrostatic pressure force acts differently at different points. It follows the principle of Pascal's law, which states that the pressure at a point in a fluid is transmitted equally in all directions. As a result, the force distribution can vary across the surface.

In summary, the hydrostatic pressure force does not always act on the centroid of the area. Its distribution depends on the shape, orientation, and depth of the submerged surface, following the principles of Pascal's law.

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The value of resistor R that gives the circuit in the figure a time constant of 22 μs is 220 Ω.

The circuit that is in the figure is shown below:Given that time constant (RC) = 22 μs. To find the value of resistor R, we need to use the formula for the time constant:

RC = τ, where R is the resistance and C is the capacitance of the circuit.

Rearranging the above formula, we get:R = τ / C

Where τ is the time constant and C is the capacitance of the circuit.

From the figure, the capacitance is given as 0.1 μF

.Substituting the values of τ and C in the above formula, we get:

R = (22 × 10⁻⁶ s) / (0.1 × 10⁻⁶ F)

R = 220 Ω

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The kinetic energy k and the gravitational potential energy ug of a block sliding up an incline are both decreasing during the motion up the incline. Option C is correct .  

Energy is the capability to do work. There are two forms of energy: potential energy and kinetic energy.

Potential energy is stored energy as a result of an object's location or condition, whereas kinetic energy is the energy of motion.

The total energy of an object can be calculated as the sum of its potential and kinetic energies.

Since the block is moving up the incline, it is subjected to gravity. As a result, it must have both kinetic and potential energy.

Kinetic energy is associated with the motion of an object, while potential energy is associated with its position.

At the base of the slope, the block has a specific quantity of kinetic energy due to its motion.

It also has a specific amount of gravitational potential energy at the base of the slope since it is a certain distance above the Earth's surface.

As the block climbs the incline, it slows down due to the effect of gravity. This implies that its kinetic energy is decreasing.

At the same time, it is gaining height, which implies that its gravitational potential energy is decreasing as well. As a result, k and ug are both decreasing.

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Answer:

CO2 + H2O + O2

Explanation:

The correct statement that identifies the products of photosynthesis is C6H12O6 + O2. In photosynthesis, carbon dioxide, water, and light are used to produce glucose and oxygen.

Photosynthesis is a biological process that converts light energy, usually from the Sun, into chemical energy in plants, algae and certain types of bacteria. The photosynthesis formula is usually depicted as: 6CO2 + 6H2O + light energy = C6H12O6 + 6O2. This means that the correct statement that identifies the products of photosynthesis is C6H12O6 + O2. In this reaction, carbon dioxide (CO2), water (H2O) and light are used to produce glucose (C6H12O6) and oxygen (O2). The glucose is used by the plant for energy and growth while oxygen is a byproduct released into the atmosphere.

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For a successful final touch of a construction venture, key stakeholders consisting of the consumer/proprietor, architect/layout group, and creation contractor are crucial. Risk management is necessary to perceive and mitigate capacity risks, ensuring project success and minimizing disruption

The 3 important stakeholders for the development of a new mall in Alexandra are:

During the construction of an avenue in a particular network, the network is represented by:

Local Authorities: The local authorities, which include the municipal or city council, represent the community's pastimes. Their duties consist of engaging with the network to apprehend their needs and issues associated with the road construction project.

Before any sort of Civil Engineering mission is executed, the subsequent steps want to be taken to ensure the viability of the challenge:

The hierarchy of running for a contractor sporting out the development of a bridge typically consists of the subsequent degrees:

To draw the bar chart (also referred to as a Gantt chart) for a 50 km street creation undertaking with a duration of 10 days, the chart could represent the obligations and their respective intervals. However, a standard bar chart for an avenue creation undertaking may also include duties including surveying, excavation, laying subbase, paving, and street markings, amongst others.

The horizontal axis represents the timeline (in days), and the vertical axis represents the responsibilities. Each undertaking is represented with the aid of a horizontal bar that suggests its length.

Question 2 (10):

2.1 Risk control is vital in a venture for the following motives:

Overall, change management is important for figuring out, analyzing, and responding to risks in a systematic and proactive manner. It enables ensuring task success by using lowering uncertainties and maximizing opportunities for task delivery within the preferred parameters.

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The approximate resolution of the 10-bit DAC is 2.44 mV.

A DAC (digital-to-analog converter) converts a digital signal into an analog signal. It does this by representing the digital signal as a series of voltage levels, which are then used to produce the analog output. The number of voltage levels that a DAC can represent is determined by the number of bits it has.

In the case of a 10-bit DAC, it has 2^10 (1024) possible voltage levels that it can represent. This means that it can represent voltages ranging from 0 to 2.5 V with a resolution of 2.5 V/1024, which is approximately 0.00244 V or 2.44 mV.

To understand why we divide the range by the number of levels to get the resolution, consider the example of a 2-bit DAC. This DAC has four possible levels: 0 V, 0.33 V, 0.67 V, and 1 V. The voltage range that it can represent is 0 to 1 V. To calculate the resolution of the DAC, we divide the range by the number of levels, which gives us:

Resolution = Range / Number of levels

= 1 V / 4

= 0.25 V

This means that the smallest change in voltage that can be represented by the DAC is 0.25 V. In other words, the DAC can only represent voltages that are multiples of 0.25 V, such as 0 V, 0.25 V, 0.5 V, 0.75 V, or 1 V.

In general, the resolution of a DAC is important because it determines the accuracy of the analog output. A higher resolution means that the DAC can represent smaller changes in voltage, which translates to a more accurate analog signal.

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Answer:

42g

Explanation:

the mass of a body is given by

m=weight/gravity

=420/10

=42

I hope this helps

Answer:

169ml

Explanation:

The impact force for vehicle A was equal and opposite to the impact force for vehicle B.

The given parameters;

Vehicle A:

Vehicle B:

The impact force for vehicle A is calculated as follows;

\(F = ma = \frac{mv}{t} = \frac{3000 \times 10}{0.01} = 3,000,000 \ N\)

The impact force for vehicle B is calculated as follows;

\(F = ma = \frac{mv}{t} = \frac{1000 \times -30}{0.01} = - 3,000,000 \ N\)

Thus, we can conclude that the impact force for vehicle A was equal and opposite to the impact force for vehicle B.

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Answer:

.

The common velocity of the two bodies after the collision is 2.7 m/s.

This can be calculated using the equation of conservation of momentum:

m1v1 + m2v2 = (m1 + m2)v

where m1 is the mass of the first body (12 kg), v1 is the velocity of the first body (4.2 m/s), m2 is the mass of the second body (18 kg), v2 is the velocity of the second body (0 m/s), and v is the common velocity of the two bodies after the collision.

Substituting the given values into the equation, we get:

12(4.2) + 18(0) = (12 + 18)v

Solving for v, we get:

v = 2.7 m/s

Answer: Substance 3 is liquid at room temperature

Explanation: The common room temperature is assumed to be 20-22°C, we need to find the substance that will be in liquid state in that temperature.

For Substance 1, the boiling point is -195.975°C, and hence at room temperature, it would be in vapor phase and all liquid would have turned to gas.

For Substance 2, the boiling point is 3.85°C, and hence at room temperature, it would be in vapor phase and all liquid would have turned to gas in this case too.

For Substance 3, the boiling point is 77.85°C, and melting point is -108.15°C, hence at room temperature, it would be in liquid state.

For Substance 4, the melting point itself is 1800°C, due to which at room temperature it would be in solid state.

 The magnetic field amplitude measured by the airplane is 2.79 × 10⁻⁷

The electric field amplitude of the sinusoidal radio waves from a transmitter on the earth's surface that is measured by an airplane flying 10.5 km above the ground is 0.840 v/m. The magnetic-field amplitude of these waves can be calculated using the equation \(B=\frac{E}{c}\), where B is the magnetic-field amplitude, E is the electric-field amplitude, and c is the speed of light in a vacuum (299,792,458 m/s). Plugging in the values from the question yields a magnetic-field amplitude of 0.00280 A/m.

This equation can be used to calculate the magnetic-field amplitude of any sinusoidal wave when the electric-field amplitude is known. The result is always inversely proportional to the speed of light; that is, as the speed of light increases, the magnetic-field amplitude decreases. This is because a change in the electric field causes a corresponding change in the magnetic field, and the speed of light limits how quickly this change can occur.

In summary, the magnetic-field amplitude of sinusoidal radio waves from a transmitter on the earth's surface that is measured by an airplane flying 10.5 km above the ground is 0.00280 A/m. This amplitude can be calculated using the equation \(B=\frac{E}{c}\), where B is the magnetic-field amplitude, E is the electric-field amplitude, and c is the speed of light in a vacuum.

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