a lorry has a mass of 32000 kilograms. each tyre has an area of 400 cm squared in contact with the ground. calculate the pressure exerted on the ground if the lorry has 6 tyres​

Answer: The pressure of the solid on the surface depends on the area of contact. The greater the force or the smaller the area the greater the pressure.

II.  The work done by frictional force is zero.

Work is said to be done when an applied force moves an object over a given distance.

Work done by friction = μ(Fn)d

where;

Since the frictional force could not prevent the block from sliding, we can conclude that the work done by frictional force is zero.

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Answer:

A

Explanation:

Answer:

prevailing easterlies

Answer: The charges must be like charges (both positive or both negative).

Explanation:

The flux of the vector field F across the surface S in the indicated direction is -24π.  

We know that the flux of a vector field F across a surface S is given by the surface integral, ∫∫S F ⋅ dS. Here, dS is the surface area element, which is given by dS = ndS, where n is the unit normal to the surface S, and dS is the area element on the surface S. Let us determine the unit normal to the surface S. For the given surface S, we have the equation of the surface in cylindrical coordinates as z = 3r, where r = √(x^2 + y^2) is the radial coordinate. The unit normal to the surface S is then given by n = ( ∂z/∂r)i + ( ∂z/∂θ)j - k, where i, j, and k are the unit vectors along the x, y, and z axes respectively.  

We now evaluate the first integral. ∫∫S x4y dS = ∫₀⁴ ∫₀^(2π) (r cosθ) (4r sinθ) r dz dθ = 4 ∫₀⁴ ∫₀^(2π) r^3 cosθ sinθ dz dθ = 0. Using cylindrical coordinates, we have the equation of the surface S as z = 3r. Hence, z varies from 0 to 4, and r varies from 0 to √(16 − z^2). We now evaluate the second integral. ∫∫S z dS = ∫₀⁴ ∫₀^(2π) (3r) r dθ dz = 3 ∫₀⁴ ∫₀^(2π) r^2 dθ dz = 24π. Hence, we have ∫∫S F ⋅ dS = 3 ∫∫S x4y dS - ∫∫S z dS = 3(0) - 24π = -24π.

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Answer:

22 cm ^3

Explanation:

P1 V1   = P2 V2         with constant mass and temperature

11 ( 5 x 10^5 ) =  x  ( 2.5 * 10^5)

x = 22 cm^3              ( when you 1/2 the pressure, you double the volume)

Answer:

A Both physical and chemical changes.

Explanation:

At 7 AM (13 hours after 6 PM), the temperature would be close to the average temperature of 59°F, which can be approximated to 65.9°F.

The temperature over a 24-hour period can be modeled using a sinusoidal function, given that the high temperature of 77°F occurs at 6 PM and the average temperature is 59°F.

To find the temperature at 7 AM, we need to consider the characteristics of a sinusoidal function. In this case, the function represents a single day, with the peak temperature at 6 PM and the average temperature over the 24-hour period.

Since a sinusoidal function repeats itself every 24 hours, we can infer that the low temperature would occur 12 hours after the high temperature. Therefore, at 7 AM (13 hours after 6 PM), the temperature would be close to the average temperature of 59°F, which can be approximated to 65.9°F.

To gain a deeper understanding of sinusoidal functions and their applications in modeling temperature variations over time, it would be beneficial to explore topics such as periodic functions, trigonometry, and mathematical modeling.

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Answer:

4 seconds

Explanation:

Given:

Δy = 0 m

v₀ = 20 m/s

a = -10 m/s²

Find: t

Δy = v₀ t + ½ at²

0 m = (20 m/s) t + ½ (-10 m/s²) t²

0 = 20t − 5t²

0 = 5t (4 − t)

t = 4

Answer:

An element is a pure substance and is made of only one type of atom; it cannot be broken down into a simpler substance.

The physically reasonable situation is the one where the magnetic force F is perpendicular to both the velocity v and the magnetic field B, following the right-hand rule.

Since the velocity is directed to the right and the magnetic field is directed out of the screen toward you, the force should be directed either up or down. Based on the given information, it's not possible to specify which drawing is correct without visual references. Please provide more details or the drawings to help you identify the correct situation.

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The size of the resultant force is 752.9 N, and its direction is 15.6° anticlockwise from the direction of travel.

What is Force?

In physics, force is a push or pull that can cause a change in motion or deformation of an object. It is a vector quantity, which means it has both magnitude (size) and direction.

Force is measured in units called Newtons (N) in the International System of Units (SI). One Newton is defined as the force required to give a mass of one kilogram an acceleration of one meter per second squared.

Magnitude: 400 N

Horizontal component: 400 cos(20°) = 376.9 N

Vertical component: 400 sin(20°) = 137.2 N

Force 2:

Magnitude: 350 N

Horizontal component: 350 cos(10°) = 342.0 N

Vertical component: 350 sin(10°) = 60.4 N

To find the resultant force, we can add the horizontal and vertical components separately:

Horizontal component: 376.9 N + 342.0 N = 718.9 N

Vertical component: 137.2 N + 60.4 N = 197.6 N

To find the magnitude of the resultant force, we can use the Pythagorean theorem:

Magnitude: √(718.9² + 197.6²) = 752.9 N

To find the direction of the resultant force, we can use trigonometry:

Direction: tan⁻¹(197.6/718.9) = 15.6°

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The conceptual definitions for terms describing waves are:

1. Wavelength: The distance between two consecutive points in a wave that are in the same phase, usually measured from crest to crest or trough to trough.

2. Period: The time it takes for one complete cycle of a wave to pass a given point, usually measured in seconds.

3. Velocity: The speed at which a wave propagates through a medium, typically measured in meters per second (m/s).

4. Amplitude: The maximum displacement of a point in a wave from its equilibrium position, often representing the energy or intensity of the wave.

5. Frequency: The number of complete wave cycles that occur in one second, typically measured in hertz (Hz).

6. Intensity: The amount of energy carried by a wave per unit time and area, often related to the amplitude and frequency of the wave.

7. Phase: The position of a point in a wave relative to the wave's cycle, usually measured in degrees or radians and used to describe the timing relationship between different parts of a wave or between multiple waves.

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If \(\vec A\) and \(\vec B\) are perpendicular, then their dot product is zero. This means

\(\vec A \cdot \vec B = (\vec\imath + 5\,\vec\jmath + n\,\vec k) \cdot (2\,\vec\imath - \vec\jmath + \vec k) = 2 - 5 + n = 0\)

Solving for n is trivial; it follows that n = 3.

The human life valuation based on the information is E. $500000 or more.

It was illustrated that the motorcycle riders to wear helmets reduces the probability of a motorcycle fatality from 0.3 percent to 0.2 percent over the lifetime of a motorcycle rider.

Probability is the occurence of likely events. It is the area of mathematics that deals with numerical estimates of the likelihood that an event will occur or that a statement is true.

Since the cost of a lifetime supply of helmets is $500, the lifetime human life = = 500 / (0.3 - 0.2) × 100

= 500 / 0.1 × 100

= 5000 × 100

= 500000

The correct option is E.

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Complete question

Suppose that requiring motorcycle riders to wear helmets reduces the probability of a motorcycle fatality from 0.3 percent to 0.2 percent over the lifetime of a motorcycle rider and that the cost of a lifetime supply of helmets is $500. it is efficient for the government to require riders to wear helmets if human life is valued at:

A. $100 or more.

B. $150 or more

C. $500 or more.

D. $50000 or more.

E. $500000 or more.

The given statement "a total link (uplink and downlink) [c/no] is 45.35 db. based upon desired ber, the required [eb/no] is 9.7db. therefore, the maximum bit rate capacity will be 3.67 kbps" is true (because The value of 45.35 dB represents the carrier-to-noise ratio (C/N0), which is a measure of the strength of the signal relative to the background noise).

The term "total link" refers to the overall performance of the communication link, including both the uplink and downlink.

To achieve a desired bit error rate (BER), the required energy-per-bit-to-noise-density ratio (Eb/No) needs to be calculated. In this case, the required Eb/No is 9.7 dB.

The maximum bit rate capacity can be calculated using the Shannon-Hartley theorem, which relates the channel capacity to the bandwidth and signal-to-noise ratio (SNR). In this case, the maximum bit rate capacity is calculated as:
C = B * log2(1 + SNR)

where B is the bandwidth and SNR is the signal-to-noise ratio. Given the C/N0 value of 45.35 dB, the SNR can be calculated as:
SNR = (C/N0) - 10log10(R)

where R is the data rate. Substituting the values, we get:
SNR = 45.35 - 10log10(3.67)
SNR = 30.97 dB

Substituting the SNR value in the Shannon-Hartley formula, we get:
C = B * log2(1 + 10^(SNR/10))
C = 2.5 kHz * log2(1 + 10^(30.97/10))
C = 3.67 kbps

Therefore, the maximum bit rate capacity will be 3.67 kbps, which is a true statement.

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Based on the given information, the total link (uplink and downlink) has a C/No of 45.35 db. The required Eb/No for the desired bit error rate (BER) is 9.7db. Using this information, we can calculate the maximum bit rate capacity, which is found to be 3.67 kbps. The statement is true.

The C/No represents the carrier-to-noise ratio, which is an important parameter to determine the quality of the communication link. The Eb/No is a measure of the signal quality and is directly related to the BER. The higher the Eb/No, the lower the BER. Therefore, the required Eb/No of 9.7 db is reasonable for the desired BER.

The maximum bit rate capacity is calculated using Shannon's theorem, which states that the channel capacity is directly proportional to the bandwidth and logarithmically proportional to the Eb/No. Therefore, by knowing the Eb/No, we can calculate the maximum bit rate capacity of the link.
Hi! Based on the provided information, we can calculate whether the maximum bit rate capacity will be 3.67 kbps. First, we have the total link C/N0, which is 45.35 dB. The required E_b/ , determined by the desired BER, is 9.7 dB. To find the maximum bit rate capacity, we need to calculate the link margin.

Step 1: Convert dB values to regular numbers
C/N0 = 10^(45.35/10) = 35,388.16
E_b/N0 = 10^(9.7/10) = 9.120

Step 2: Calculate the link margin
Link Margin = (C/N0) / (E_b/N0) = 35,388.16 / 9.120 = 3,878.71

Given the calculated link margin, it is not true that the maximum bit rate capacity will be 3.67 kbps. The maximum bit rate capacity can be higher than 3.67 kbps, as the link margin indicates the potential for a larger capacity.

Suppose each bulb has resistance r . with bulb c in place, bulbs b and c are in blank and have equivalent resistance blank. This implies that if we remove bulb C and replace it with an identical bulb, the resistance of the circuit will remain the same

Suppose each bulb has resistance r. When bulb C is in place, bulbs B and C are in series and have an equivalent resistance of 2r. In a series circuit, the total resistance is the sum of the individual resistances. When bulbs B and C are in series, the current flowing through them is the same. Thus, the total resistance is the sum of their resistances, which in this case is r + r = 2r. In a series circuit, the same current flows through each component. This means that if bulb C has resistance r and is in series with bulb B, the current passing through bulb B is also the same. The voltage across the bulbs is divided between them based on their resistances, and since they have the same resistance r, they receive equal voltage. So, with bulb C in place, bulbs B and C are connected in series and have an equivalent resistance of 2r. This implies that if we remove bulb C and replace it with an identical bulb, the resistance of the circuit will remain the same. Series circuits allow the current to flow through each component one after another, while the voltage divides between them.

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Answer:

D. Tidal energy is replaced naturally by the Moon's gravity.

Explanation:

The reason tidal energy is considered a renewable energy resource is that Tidal energy is replaced naturally by the Moon's gravity. The Moon's gravity creates bulges on the side of Earth that is closest and farthest from the Moon. These bulges also pull water causing high tides in those areas. As the Earth rotates these areas experience low tide while the areas that had low tide now experience high tide. This constant shift creates tidal energy every day, which is replenished naturally.

The factor by which the radii of the arterioles can constrict is given by r2/r1.

The ratio r2/r1 represents the factor by which the initial radius (r1) of the arterioles can constrict to the constricted radius (r2). When the arterioles constrict, their diameters decrease, resulting in a reduction in blood flow through these blood vessels.

The constriction of arterioles is a regulatory mechanism used by the body to control blood flow and maintain proper blood pressure in different tissues and organs. The factor r2/r1 quantifies the extent of the constriction.

For example, if r2/r1 is 0.5, it means that the constricted radius is half the size of the initial radius. Therefore, a higher value of r2/r1 indicates a greater degree of constriction and a more significant reduction in blood flow.

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A thermal energy transfer portfolio would be an excellent way for students to showcase their knowledge and understanding of this important scientific concept.

Thermal energy transfer is the energy transfer between two or more objects that have different temperatures. This energy transfer can take place in three different ways: conduction, convection, and radiation. A portfolio is a collection of documents or pieces of work that demonstrate a person's skills, abilities, and achievements in a particular area.

Therefore, a thermal energy transfer portfolio would be a collection of documents or pieces of work that demonstrate a person's skills, abilities, and achievements related to thermal energy transfer. This portfolio could include lab reports, experimental data, diagrams, and explanations of the various ways thermal energy can be transferred.

For example, a student's thermal energy transfer portfolio might include:

1. A lab report detailing an experiment they conducted to measure the rate of heat transfer through different materials using conduction.

2. A diagram showing the process of heat transfer through convection in a fluid, such as air or water.

3. A written explanation of the concept of radiation and how it relates to thermal energy transfer.

4. A spreadsheet of data showing the temperature changes in a system as heat is transferred through it.

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Answer: B

Explanation: it is perpendicular to a surface

Answer:

it is perpendicular to a surface

Explanation:

Both cars will have a final speed of 5.80 m/s in an elastic collision due to conservation of momentum and kinetic energy.

In a versatile crash, both force and motor energy are saved. The underlying force of the framework is the amount of the momenta of the two vehicles, while the underlying active energy is the amount of the motor energies of the two vehicles. Utilizing the protection of force and dynamic energy conditions, we can decide the last speeds of the two amusement carts. The last speeds of the vehicles will be something similar because of preservation of force. For this situation, the last velocities of the two vehicles will be 5.80 m/s. This implies that the crash was completely versatile, and the motor energy was moderated.The underlying force is the amount of the momenta of the two vehicles, which is given by:

p_initial = m1v1 + m2v2

The underlying motor energy is the amount of the active energies of the two vehicles, which is given by:

KE_initial = 0.5m1v1^2 + 0.5m2v2^2

Connecting the given qualities, we get:

v1' = (2(400 kg)(6.00 m/s) - (400 kg)(5.60 m/s) + (400 kg)(5.60 m/s))/(2(400 kg))

v1' = 5.80 m/s

v2' = (2(400 kg)(5.60 m/s) - (400 kg)(6.00 m/s) + (400 kg)(6.00 m/s))/(2(400 kg))

v2' = 5.80 m/s

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a. heat is flowing from your hand to the door handle.

Temperature is not flowing, is heat which flows and make you feel that sensation

A tiny neutrally buoyant electronic stress probe is launched into the inlet pipe of a water pump and transmits 2000 strain readings per second as it passes through the pump. This is a lagrangian measurement.

Lagrangian measurement is a technique used in fluid dynamics to track the motion of particles or objects within a fluid. The Lagrangian approach follows the motion of individual fluid particles, while the Eulerian approach observes the flow of fluid at fixed points in space. In Lagrangian measurement, the position, velocity, and acceleration of each particle is tracked over time.

Lagrangian measurements can provide information on the mixing and dispersion of pollutants in the environment, the transport of sediment in rivers, and the movement of microorganisms in oceans. Lagrangian measurements can be conducted using a variety of techniques, such as tracer particles, acoustic or optical sensors, and satellite imagery. These measurements have applications in a range of fields, including meteorology, oceanography, and environmental science.

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A force vector with magnitude 750 N and angle 30⁰ can be written as a Cartesian vector as: F = 375√3 i + 375 j

A vector can be written as its x-component and y-component.

Suppose the angle of a vector F with the positive x-axis is θ, then its components are given by:

Fx = F cos θ

Fy = F sin θ

Then,

F = Fx i + Fy j

  = F cos θ i + F sin θ j

In the given problem, θ = 30⁰, F = 750.

Hence,

Fx = 750 cos 30⁰

    = 750 (1/2)√3 = 375√3

Fy = 750 sin 30⁰

   = 750 (1/2) = 375

Thus, the vector can be written as a Cartesian vector:

F = 375√3 i + 375 j

Your question is incomplete, most likely your question was:

Express the force as a Cartesian vector. F 750 N. The angle of the force vector with the horizontal is 30⁰.

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Answer:

Explanation:

Capacity: the max amount that something can contain.

"the capacity of the freezer is 1.1 cubic feet"

capacitor: device for storing electrical energy, includes two conductor that are close to one another and insulated from each other. A simple example is a parallel-plate capacitor.

Source: Britannica.com

Answer:

Explanation:

26. D. crushing the sugar cube and dissolving it in water.

27. A. atom

28. B. molecule

29. B. plum pudding model of Joseph John Thomson

30. B. He used cathode ray tubes which showed that all atoms contain tiny negatively charged subatomic particles or electrons.

31. D. protons and neutrons are relatively heavier than electrons.

Answer:

The momentum in the cart system is conserved and both carts travel at the same speed in opposite directions as they have approximately the same mass. When one cart is weighted, its velocity decreases and the other cart's velocity increases. ... Also, because this cart has increased in mass, its momentum increases.

Answer: I DISAGREE with Morgan

Explanation:

A compound is made up of two or more elements which are usually chemically bonded together. Such elements can only be separated by a chemical process and not by physical processes like filtration and decantation.

Examples of compounds includes:

--> Table salt(NaCl) this is a chemical compound which contains elements such as sodium and chlorine which are chemically bonded together.

--> water(H2O): this contains elements such as hydrogen and oxygen chemically bonded together

But substances such as sand is not a compound but a mixture which contains natural deposits of silicon dioxide, small rocks and other organic substances which are not chemically bond together.

Therefore, the combination of equal parts of salt and sand will lead to the formation of a HETEROGENEOUS MIXTURE not a compound.

This is a type of mixture in that made up of different compositions.