A weight lifter does 2940 J of work to lift a 150kg barbell over his head. If he does so in 5 seconds, how much power did he exert?

The τ at points a, b, c, and d cannot be determined without additional information such as the shape and size of the cross-section.

The maximum shear stress τmax of 9 ksi only provides information about the maximum stress that the cross-section can withstand. It does not provide information about the stress distribution within the cross-section. To determine the stress at specific points, additional information such as the shape and size of the cross-section, as well as the location and direction of the applied load, is needed.

For example, in a rectangular cross-section subjected to a uniformly distributed load, the shear stress distribution is linear and maximum at the neutral axis. Thus, the shear stress at points a, b, c, and d can be determined based on their location relative to the neutral axis. However, without this additional information, the τ at specific points cannot be determined based solely on the maximum shear stress.

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The factors that can change the pattern observed on a screen during Young's double-slit experiment are given below:1. Width of the slit. 2. Distance between slits. 3. Distance between slits and screen. 4. Wavelength of the incident light. 5. Refractive index of the medium.

The factors that can change the pattern observed on a screen during Young's double-slit experiment are given below:

1. Width of the slit. The width of the slit can influence the diffraction pattern that is observed on a screen. When the width of the slit decreases, the central maximum of the diffraction pattern becomes broader, and the intensity of the secondary maxima reduces.

2. Distance between slits. The distance between the slits in the double-slit experiment also affects the pattern on the screen. The distance between the slits is equal to the spacing between the maxima. If the spacing between the slits decreases, the distance between the maxima decreases, and vice versa.

3. Distance between slits and screen. The distance between the slits and the screen is also a factor that can affect the diffraction pattern. When the distance increases, the spacing between the maxima becomes wider, and the intensity of the maxima decreases.

4. Wavelength of the incident light. The wavelength of the incident light is another factor that affects the diffraction pattern on the screen. When the wavelength increases, the spacing between the maxima increases, and vice versa.

5. Refractive index of the medium. The refractive index of the medium in which the light travels can also influence the diffraction pattern observed on a screen.

When the refractive index of the medium changes, the position of the maxima changes as well. These are the factors that can change the pattern observed on a screen during Young's double-slit experiment.

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Based on the principle of conservation of momentum;

The principle of conservation of momentum states that in an isolated system of colliding bodies, momentum is conserved.

This principle can be stated mathematically as:

The average speed of each trolley is calculated using the formula:

For Trolley A:

average speed = 100 mm/0.5 = 200 mm/s

average speed of A = 0.2 m/s

For Trolley B:

distance = 200 mm = 0.2 m

average speed = 0.2 m/0.5 s

average speed of B = 0.4 m/s

Momentum = mass × velocity

Assuming direction of motion of B is positive, direction of A is negative

Momentum of A = - m × 0.2 = -0.2m

Momentum of B = m/2 × 0.4 = 0.2 m

Total momentum = 0.2 m - 0.2 = 0

Therefore, the total momentum before and after the release of the spring is zero.

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Answer:

Newton believed that mass tells gravity how much force to exert. Einstein believed that mass tells space-time how to curve.

Explanation:

Isaac Newton believed that bodies on earth had a force of gravity pulling them down as a result of their masses.

Albert Einstein believed that the bodies were not pulled down but were moving around in a circular sphere/manner.

This confirms Newton believing that mass tells gravity how much force to exert and Einstein believing that mass tells space-time how to curve.

Answer:

first one is for the assignment second is for the quiz

Explanation:

Assignment - C.

Quiz - D.

Your eye as well as the spider's image in the mirror are 1.28 meters apart.

A mirrors is a luminance that reflects light and creates an actual or fictitious picture. An device that returns an image is a reflector or looking glass, which reflects the image of the object when it is positioned in front of it. When focused through an eye or camera lens, light that reflects off a mirror will reveal an image of everything that was in front of it. Mirrors reflect light at an equal but opposite angle, reversing the orientation of the image.

The image distance is equal to the object distance:

Distance between the spider and mirror = 40cm

So, the image is formed 40cm inside the mirror

Distance between the person and mirror = 68cm

Distance between the image and person = 68+40= 128cm

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Answer:

7.315x10^-5 days

Explanation:

6.32 seconds = x days

1 day = 24 hours

1 hour = 60 minutes

1 day = 24 x 60 minutes

1 minute = 60 seconds

1 day = 24 x 60 x 60 seconds

1 day = 86400 seconds

6.32 seconds = 6.32/86400

6.32 seconds = 7.315x10^-5 days

An unmanned spacecraft leaves for Venus. The statements, The weight of the spacecraft keeps changing and The mass of the spacecraft remains the same. This 2 statements A and D are true.

A spaceship is a machine or vehicle built to travel through space. Spacecraft are a form of artificial satellite utilised for a wide range of tasks, such as communications, Earth observation, meteorology, navigation, space colonisation, planetary exploration, and freight and person transfer. All spacecraft, with the exception of single-stage-to-orbit vehicles, need a launch vehicle (carrier rocket) to get into space.

A spacecraft that is performing a sub-orbital spaceflight launches into space and then lands without gaining enough momentum or energy to complete a full orbit of the Earth. Spacecraft enter confined orbits around the Earth or other celestial bodies for orbital spaceflights. Only humans are carried on human spacecraft either as crew or guests from launch or while in orbit (space stations).

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Answer:

Power = 0.33 Watts

Explanation:

Given the following data;

Distance = 1m

Force = 20N

First of all, we would solve for the work done by the boy.

Workdone = force * distance

Substituting into the equation, we have;

Workdone = 20*1 = 20J

Now to find power;

Power = workdone/time

Power = 20/60

Power = 0.33 Watts.

Answer:

Magnitude = 50 units

Direction = 53.13°

Explanation:

The formula to find out the magnitude of a resultant vector with the help of its x and y components is given as follows:

\(Magnitude = \sqrt{x^{2} + y^{2}}\\\\\)

where,

x = 30 units

y = 40 units

Therefore,

\(Magnitude = \sqrt{(30 unit)^{2} + (40\ unit)^{2}}\\\\\)

Magnitude = 50 units

Now, the direction of the resultant vector will be given by the following formula:

\(Direction = tan^{-1}\frac{y}{x}\\\\Direction = tan^{-1}\frac{40}{30}\)

Direction = 53.13°

Answer:

Frequency and wavelength are inversely proportional to each other. The wave with the greatest frequency has the shortest wavelength. Twice the frequency means one-half the wavelength.

Explanation:

Answer:

To find out how long it will take a car to cover 870 miles at a speed of 35 miles per hour, we can use the formula:

time = distance ÷ speed

Plugging in the given values, we get:

time = 870 miles ÷ 35 miles per hour

Simplifying the right side by dividing 870 by 35, we get:

time = 24.86 hours

Rounding to the nearest hour, the answer is:

time = 25 hours

Therefore, it will take the car approximately 25 hours to cover a distance of 870 miles at a speed of 35 miles per hour.

Given data

*The given mass of the car is m = 1610 kg

*The given effective force constant is k = 5.75 × 10^4 N/m

(a)

The formula for the period of oscillation of a 1610 kg car is given as

Substitute the known values in the above expression as

Hence, the time period of oscillation of a 1610 kg car is T = 1.05 s

(b)

As from the given data, the amplitude of the oscillation of the car decreases by a factor of 5.00. Then, the expression for the amplitude of the oscillation, and the damping constant (b) is calculated as

Substitute the known values in the above expression as

Hence, the damping constant is b = 9871.2 kg/s

Answer:

concepts of inertia and gravity

An electron and the surface that encloses it in the image.The electric flux through this surface would be equal to 4πkQ.

The electric flux is the measure of the amount of electric field lines passing through a surface. In this case, there is an electron enclosed within a surface. Thus, we can say that there is an electric field passing through this surface. Therefore, there will be an electric flux passing through this surface. Since there is only one electron, the electric flux through the surface will be dependent on the strength of the electric field at that point.

The formula for electric flux is given by;

ΦE = E x A

Where;ΦE is the electric flux through the surface

E is the electric field passing through the surface

A is the area of the surface.Substituting the values we have,

E = kQ / r²

Where;

k = Coulomb’s constant

Q = Charge on the electron

r = radius of the surface

Assuming the surface is spherical, we have the surface area as

A = 4πr²

We can then substitute the values we have into the equation to get;

ΦE = kQ / r² x 4πr²ΦE = 4πkQ

Therefore, the electric flux through this surface is equal to 4πkQ.

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Answer: electrostatic force

Explanation:

electrostatic forces pull or push on objects without touching them, which is how when you rub some materials together they can result in something called a 'charge', being moved from point A to point B.

Answer:

6km/hr

Explanation:

Lets make a chart

   R.                                G

D  6km.                   6 /2=3km

S.  6/1/1= 12 km/h.    6km/h= 3/1/2  

T  1/2hr                       1/2hr

so 6km/hr hope that helps if it does please mark as brainliest.

when driving at 60 mph, in four seconds, you've travelled 107.29 m

Speed is the distance travelled per unit. Mathematically, it can be expressed as:

Speed = distance / time

We'll begin by converting 60 mph to m/s. This can be o btained as follow:

1 mph = 0.44704 m/s

Therefore,

60 mph = (60 mph × 0.44704 m/s) / 1 mph

60 mph = 26.8224 m/s

The distance travelled can be obtained as follow:

Speed = distance / time

Cross multiply

Distance = speed × time

Distance = 26.8224 × 4

Distance = 107.29 m

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VPNs commonly use protocols such as OpenVPN, IPsec, L2TP/IPsec, and SSTP. Each protocol has its strengths and weaknesses. For example, OpenVPN is known for its strong security and flexibility, while IPsec offers a high level of encryption and is often used for site-to-site VPNs.

Reasons why someone might choose not to update VPN protocols include compatibility issues with older devices or software, potential disruptions in service during the update process, or concerns about introducing new vulnerabilities or bugs with the updated protocol.

However, it's generally recommended to keep VPN protocols up to date to ensure the highest level of security and compatibility with evolving network environments.

Information about VPN protocols and reasons for updating or not updating them:

1. OpenVPN: It is an open-source protocol that is highly configurable and supports various encryption algorithms. It is known for its strong security and is widely supported across different platforms. Updating OpenVPN ensures that you have the latest security enhancements and bug fixes.

2. IPsec (Internet Protocol Security): IPsec provides a suite of protocols for securing IP communications. It offers strong encryption and authentication mechanisms. While IPsec is commonly used for site-to-site VPNs, it may require additional configuration for remote access VPNs. Updating IPsec ensures that any vulnerabilities or weaknesses discovered in previous versions are addressed.

3. L2TP/IPsec (Layer 2 Tunneling Protocol with IPsec): This protocol combines the tunneling capabilities of L2TP with the security of IPsec. It is supported by various operating systems and devices. However, L2TP/IPsec has been subject to some vulnerabilities and security concerns, so keeping it up to date helps mitigate these risks.

4. SSTP (Secure Socket Tunneling Protocol): Developed by Microsoft, SSTP uses the SSL/TLS protocol to establish a secure connection. It is primarily used on Windows platforms. While SSTP is considered secure, it may not be as widely supported as other protocols. Updating SSTP ensures compatibility and addresses any known vulnerabilities.

Reasons for not updating VPN protocols may include:

a. Compatibility concerns: Some older devices or software may not support the latest VPN protocol updates. In such cases, updating could lead to connectivity issues.

b. Disruptions during the update process: Updating VPN protocols might require restarting services or temporarily interrupting VPN connections, which can cause inconvenience or downtime for users.

c. Stability concerns: New protocol updates may introduce unknown bugs or compatibility issues, potentially impacting the stability and reliability of the VPN service. In such cases, organizations may prefer to delay updates until the new version is thoroughly tested and deemed stable.

It's important to balance the need for security, compatibility, and stability when deciding to update VPN protocols. In general, staying up to date with the latest protocol versions helps maintain the highest level of security and ensures compatibility with evolving network environments.

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The distribution of geologic activity is random pattern.

Geology refers to the science that studies the structure of the earth and other planet together with their origins and development, especially by examination of its rocks.

Distribution is the act of dividing and apportioning into different portions and dispense.

Geological distribution is the scientific study of dividing the structure of the earth and its origins. The pattern of geological distribution is random such that it doesn't have a definite direction.

So therefore, the distribution of geologic activity is random pattern.

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When separated by 4 meters, the 20,000-kilogram truck and the 3,200-kg automobile are attracted to one other with a force of attraction of roughly 0.0000016748 N. The right response in this case is option A.

Newton's rule of universal gravitation, which says that the force between two things is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers, may be used to compute the force of attraction between two objects. The equation can be written mathematically as:

F = G * (m1 * m2) / r^2

Where:

F is the gravitational constant, while G is the force of attraction.

The two objects' masses are m1 and m2, and their separation from one another's centers is r.

In this instance, the truck weighs 20,000 kg, whereas the automobile weighs 3,200 kg. They are 4 meters apart from one another.

With these values entered into the formula, we obtain:

F = (6.674 × 10^-11 N(m/kg)^2) * (20,000 kg * 3,200 kg) / (4 m)^2

F = 1.6748 × 10^-6 N

Therefore, at a distance of 4 meters, the force of attraction between the 3,200-kilogram automobile and the 20,000-kg truck is roughly 0.0000016748 N.

Option A is therefore the one that comes the closest to this value, at 0.0003 N.

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The cork leaves the spring at a speed of 3.02 m/s.

We can use the conservation of energy to determine the speed at which the cork leaves the spring.

The initial potential energy stored in the spring is converted to the kinetic energy of the cork as it leaves the spring. Neglecting air resistance, the conservation of energy equation is:

(1/2) k x^2 = (1/2) m v^2

where k is the spring constant, x is the distance the spring is compressed, m is the mass of the cork, and v is the speed of the cork as it leaves the spring.

Substituting the given values:

(1/2) * 18 N/m * (7.47 cm / 100 cm/m)^2 = (1/2) * 0.009 kg * v^2

Solving for v:

v^2 = (18 N/m * (7.47 cm / 100 cm/m)^2) / 0.009 kg

v^2 = 9.119 m^2/s^2

Taking the square root of both sides:

v = 3.02 m/s

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Answer and Explanation:

The computation is shown below:

The ac frequency in the United States is 60 Hz

The ac frequency in Europe is 50 Hz

So,

Time for 25 spark in United stated is 25 ÷ 60 s

Time for 25 spark in Europe is 25 ÷ 50 s

Now

Tape length in United States is

= 0.5 × 9.8 × (25 ÷ 60)^2

= 0.85 m

= 85 cm

And,  

Tape length in europe is

= 0.5 × 9.8 × (25 ÷ 50)^2

= 1.225 m

= 122.5 cm

So, As it can be seen that

= 122.5 cm - 85 cm

=  37.5 cm

Europe has 37.5 cm more than in the United States

Where lighting units, cord- and plug-connected utilization equipment not fastened in place, or both, are also supplied, the overall rating of fastened-in utilization equipment, excluding luminaires, shall not be greater than 50% of the branch-circuit ampere rating.

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The low thermal conductivity rating of rigid polyurethane foam, which is one of the lowest among regularly used insulating materials, enables for effective heat flow retention.

Diamond, on the other hand, is the most thermally conductive substance, with conductivity levels reported 5 times greater than copper, the most commonly produced metal in the United States. Diamond atoms have a simple carbon backbone, which is an optimal molecular structure for heat transmission.

The highest thermal conductivity values are often found in substances with the simplest chemical components and molecular structures.

A material's thermal conductivity is a measure of its capacity to conduct heat. It is typically represented by the letters k, lambda, or kappa. Heat transmission happens at a slower rate in low thermal conductivity materials than in high thermal conductivity materials.

Thermal conductivity is a measure of a material's capacity to conduct heat. High thermal conductivity materials may effectively transport heat and rapidly absorb heat from their surroundings. Poor thermal conductors restrict heat movement and absorb heat from their surroundings slowly.

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Answer:

Explanation:

His top speed is a blip that occurs for less than the full time he was out. Below is a graph showing what he did from 1 o'clock to 9. He was walking from 1 to the point where starts walking faster and then back down again to 2. The line at 2 is longer than the triangular shape that shows where he speeded up. Then he went back down to 2 and continued at that speed until 9.

Obviously he spent more time at 2 than he did at 4 and therefore his average speed will less than the 4 speed.

Remember that average speed = total distance / total time.

Answer:

When choosing a location for a new optical observatory on Earth, there are several factors to consider. Some of the key factors include:

Taking into account these factors, some of the best locations for optical observatories on Earth are high-altitude sites in remote, dry, and mountainous areas, like Mauna Kea in Hawaii, Cerro Paranal in Chile, or Roque de los Muchachos Observatory in Spain!

Answer:

A) air particles are vibrating over your head

Explanation:

In water, particles can vibrate a lot easier so sound waves move approx 4 times faster than in air. In air, sounds only vibrate the eardrums but under water, the skull also vibrates as it is a similar density to water.

If you hear sounds under water, it is probably because the water particles are vibrating against your ear.

Sound is a type of energy that travels through matter as a wave. It is a form of mechanical energy that requires a medium (such as air, water, or solids) to propagate.

When an object vibrates, it creates pressure waves that travel through the medium as a series of compressions and rarefactions. These pressure waves cause the particles in the medium to vibrate back and forth, transferring the energy of the sound wave through the medium.

Sound travels through different mediums such as air, water, and solids by creating a series of vibrations that travel as waves through the medium.

When sound waves pass through water, they cause the water particles to vibrate, which then vibrate your eardrum, allowing you to hear the sound.

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Answer:

M= mv= 10kg x 37 m/s= 370 Kg x m/s

The tension on the hitch that connects the trailer to the car is 160 N.

From the information provided;

Initial velocity = 0 m/s (the car started from rest)

Final velocity = 11 m/s

Time taken = 28 s

From the formula;

a = v - u/t

a = 11 - 0/28 = 0.39 ms-2

The force that acts on the trailer  = tension in the hitch that connects the trailer to the car

Force = mass × acceleration

Force = 410 kg × 0.39 ms-2

Force = 160 N

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