If load is 10 KN, Cross sectionl Area is 2 square mm, Contact Area = 5 square mm. What will be Bearing stress? A.20 KN/square mm B. 2 KN/square mm C. 50 KN/square mm D. 5 KN/square mm

Answer:

you want to know newtons first law here.

Explanation:

An object that is at rest stays at rest or stays in motion.

The force of the basketball player's feet on the floor when jumping up depends on how fast they are jumping. Therefore, the answer is "could be either less or more than her weight depending on how fast she jumps."

In physics, force refers to a push or pull acting on an object, causing it to change its velocity, direction, or shape. The force on an object is proportional to its mass and acceleration, as expressed in the equation F = ma.

The weight of an object is the force due to gravity acting on it. It is expressed in the equation W = mg, where m is the mass of the object and g is the acceleration due to gravity, which is approximately 9.8 m/s² on the surface of the earth. A basketball player crouching down and then jumping straight up by extending her legs rapidly will exert a force on the floor due to her feet pushing against it.

According to Newton's Third Law of Motion, the floor will exert an equal and opposite force on the player's feet in response to the force they exert on it. This force, known as the normal force, is perpendicular to the surface of the floor and prevents the player from falling through it. As the player jumps up, her weight remains constant, but her acceleration decreases due to the opposing force of air resistance. Therefore, her force on the floor decreases as well. The force of her feet on the floor could be less than her weight if she jumps slowly, but it could be more than her weight if she jumps rapidly. Therefore, the correct answer is "could be either less or more than her weight depending on how fast she jumps."

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There are six isomeric alkenes with the formula \(C_5H_10\). These compounds differ in the connectivity of atoms and the location of the double bond.

Alkenes are a class of organic compounds that contain a carbon-carbon double bond (-C=C-). They are also called olefins, which means "oil-forming" in reference to their ability to form oily substances upon reaction with other chemicals. Alkenes have the general formula of CnH2n and are unsaturated hydrocarbons, meaning they have fewer hydrogen atoms compared to their saturated counterparts.

Alkenes are important in various fields, including the chemical industry, agriculture, and medicine. They are used to manufacture a wide range of products, such as plastics, solvents, and synthetic fibers. Alkenes are also used as starting materials for the synthesis of various chemicals, including pharmaceuticals. Due to their unique chemical properties, alkenes can undergo a variety of reactions, such as addition, oxidation, and polymerization.

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Answer:

A) having each person listen to just 1 song instead of 5.

Explanation:

Ravi could accurately use the outcome to compare the hearing capacities of his friends by this experiment if appropriate precautions are observed.

Playing 5 well known songs simultaneously could result to the interference of sounds when each participant moves away from the player. Which could naturally cause the variation in volume of the songs played with respect to the increasing distance.

Therefore, the reliability of the result from this experiment can be increased if each person listen to just 1 song instead of 5 at a predetermined volume. Each participant would be able to focus on hearing a song during the experiment.

Answer:

Wavelength and/or frequency

Explanation:

Both wavelength and frequency are used to reference any waveform. You don't want to get the two confused though, they are two different things. Wavelength specifies the distance between two specific points of a wave, while frequency shows the total number of wave oscillations in a certain time.

The "arm" of the lever is the handle or bar; it is the portion that you push or pull against. The point on which the lever rotates or balances is known as the "fulcrum.

The pivotal point of the beam is known as the fulcrum. A load is applied at the other end of a lever when an effort is exerted to one end of the lever. A mass will be raised as a result.

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The acceleration of the airboat  is 2.2m/s^2 and starting from rest, it take the airboat to reach a speed of 12.0 m/s is 5.45s

Given mass of airboat (m) = 3.50 x 10^2kg

horizontal force of engine (F) = 7.70 x 10^2N

We know that from newtons laws of motion Force = mass x acceleration such that F = ma

(a) Now a = F/m = 7.70 x 10^2 / 3.50 x 10^2 = 2.2m/s^2

(b) Initial speed of airboat (u) = 0m/s

final speed (v) = 12m/s

We have acceleration a = 2.2m/s

Then we have another newtons law as: v = u+ at where t is the time taken

So t = v/a = 12/2.2 = 5.45s

Hence it takes to reach 5.45s a speed of 12m/s

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Answer:

Weight, W = 125 N

Explanation:

Pressure, P = 5 Pa

Area, A = 25 m²

We need to find how much must a man weigh (force) if the pressure he exerts while standing on one foot which has an area of 25 m² exerts a pressure of 5 Pa. So,

Pressure = force/area

So,

\(F=P\times A\\\\F=5\times 25\\F=125\ N\)

So, the weight of the man is 125 N.

When we consider unguided wireless communications, we must understand the signal attenuation that occurs between transmit and receive antennas.

The information, or message, that we wish to transmit, is modulated onto a frequency carrier, which is then emitted from a transmit antenna in the form of an electromagnetic (EM) wave.

The signal power (watts) received by the antenna is much less than the transmitted power due to attenuation loss. The Friis equation (also known as the Free Space Loss, FSL equation) describes this attenuation loss.Attenuation, as treated in the Friis equation, is the spreading of power over an ever increasing surface area as it propagates away from the transmit antenna.

We can measure how much power resides in a 1 meter2 area as a function of distance from the isotropic antenna.

Power Density, Pd = Pt/(4πd2)

where the (λ/4πd)2 term is sometimes referred to as the path loss or free space loss. The following definitions are assumed:

Pt - The transmitted signal power.

λ - The wavelength of the carrier (i.e., the center frequency of the radiated signal)

d - The distance between the transmitting and receiving antennas.

We can also place the above equation into decibel format:

FSLdB = [FSL] = 20log10(4πd/l) = 20log10(4π) + 20log10(d) - 20log10(l)

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A spring-loaded ballistic cart is in contact with a second cart. The velocity of the other cart is 0.25 m/s.

When there is no external force acting on the system, the initial momentum is equal to the final momentum.

Momentum is equal to the product of mass and its velocity.

According to the conservation of linear momentum,

m₁v₁ +m₂v₂ = m₁u₁ +m₂u₂

u and v represents the initial and final velocity. 1 and 2 represents the first and second cart.

Given is m₁ = 0.5 kg, m₂ =0.8kg, u₁ =u₂ =0 m/s and v₁ = 0.4 m/s.

Substituting the values in the conservation of momentum equation, we get the velocity of second cart is

0.5 x 0.4 + 0.8 x v₂ = 0.5 x 0 + 0.8 x 0

v₂ = +0.25 m/s (in the direction of first cart)

Thus,  the velocity of the other cart is 0.25 m/s.

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The correct answer is sea breeze

Answer:

Land breeze.

Explanation:

The breeze that blows from the land toward the sea after sunset. The land cools more quickly than the ocean, cooling the air above it. The warmer air above the water continues to rise, and cooler air from over the land replaces it, creating a breeze.

The impact maintains momentum. Any contact between two objects that takes place in an isolated system preserves momentum.

Mass in motion is the definition of momentum. All objects have mass, thus if an object is moving, it has momentum and its mass is in motion. How much and how quickly something is moving affect how much momentum it has.

We gauge the motion of mass using momentum. Any thing in motion will have momentum. The object's momentum is determined by its mass multiplied by its velocity, according to the laws of physics. The mass and velocity of the parameters both have an impact on momentum.

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Sometimes the moon looks like a crescent. At other times, the moon looks like a half circle. This phenomenon occur on the Earth due to the amount of sunlight changes on the Moon due to the rotation of the moon. Thus, the correct option is A.

There are a total of about eight Moon phases, which include, the new Moon, waxing crescent, half-Moon, waxing gibbous, full Moon, waning gibbous, third quarter, and waning crescent.

The Moon's shape does not really change, it only appears that way. The amount of Moon which we see as we look from the Earth changes in a cycle that repeats about once a month or 29.5 days. The relative positions of the Sun, Earth, and Moon, cause these changes.

Therefore, the correct option is A.

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A. The knowns in this problem are initial velocity, final velocity and acceleration due to gravity on the dolphin.

B. The calculated height the dolphin rises is not reasonable.

C. The time the dolphin stays in the air is calculated to be 1.48 s.

A. The initial velocity of the dolphin is given as vi = 14.5 m/s

The final velocity of the dolphin is zero.

As the dolphin jumps upwards, the gravity acting is considered negative

So, g = -9.8 m/s²

B. According to kinematics, we know the equation,

v² - u² = 2 a s

The height raised by the body of the dolphin is,

s = (v² - u²)/2a = -14.5²/(2× -9.8) = 10.73 m

The answer does not seem reasonable as it is approximately equal to three-storeyed building.

C. The time dolphin stays in the air is given by the equation,

v = u + a t

Here, a = -g

v - u = -g t

t = -(v - u)/g = -(0-14.5)/9.8 = 14.5/9.8 = 1.48 s.

The given question is incomplete. The complete question is 'A dolphin in an aquatic show jumps straight up out of the water at a velocity of 14.5 m/s.(a) List the knowns in this problem. (b) How high does his body rise above the water? To solve this part, first note that the final velocity is now a known, and identify its value. Then, identify the unknown and discuss how you chose the appropriate equation to solve for it. After choosing the equation, show your steps in solving for the unknown, checking units, and discuss whether the answer is reasonable. (c) How long a time is the dolphin in the air? Neglect any effects resulting from his size or orientation.'

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Given,

The length is r=5.70 m

The tangential speed is r=9.10 m/s

The centripetal acceleration is:

The acceleration is:

Answer:

I believe it is True... I hope it is correct :)

Explanation:

Answer : False

Explanation :

The bottleneck event of the plants in an area results in secondary succession.

A bottleneck is an event that drastically reduces the population size of an organism. The bottleneck may be caused by various events, such as an environmental disaster, the hunting or habitat destruction that results in the deaths of organisms.

Secondary succession is a type of ecological succession in which plants and animals recolonize a habitat after a major disturbance such as a devastating flood, wildfire, landslide, lava flow, or human activity e.g., farming or road or building construction.

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A) The motor can do 18,000 joules of work in 12 seconds. B) The motor can lift the 131 kg bundle of shingles to a height of approximately 13.43 meters in 12 seconds.

A. To calculate the work done by the motor, we can use the formula:

Work = Power × Time

Given that the power output of the motor is 1.5 kW (1500 W) and the time is 12 seconds, we can substitute these values into the formula:

Work = 1500 W × 12 s = 18,000 J

B. To determine how high the motor can lift a 131 kg bundle of shingles, we need to consider the gravitational potential energy associated with raising the bundle. The formula for gravitational potential energy is:

Potential Energy = Mass × Gravity × Height

In this case, the mass is 131 kg and gravity is approximately 9.8 m/s². We need to find the height, so we rearrange the formula:

Height = Potential Energy / (Mass × Gravity)

Since the work done by the motor is equal to the potential energy gained by the bundle, we can substitute the work (18,000 J) into the formula:

Height = 18,000 J / (131 kg × 9.8 m/s²) ≈ 13.43 m

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Answer:

t = S / V = 3.8E8 / 3E8 = 1.3 sec

It takes over 1 second for a radio signal to travel between the earth and the moon.

The two vectors are linearly dependent when there are constants c1, c2, not both equal to zero, such that the vector equation c1 BOA + c2 BOB = 0 holds true.

Here, let's check for which values of h the vectors BOA and BOB are linearly dependent. Vector BOA = Vector BOB = <2h-1, h-1, 3-2h>.

We have to find the value of h for which the two vectors BOA and BOB are linearly dependent.

In order to do this, we need to determine the values of c1 and c2 that will satisfy the equation below:c1 (h-1) + c2 (2h-1) = 0c1 (2-h) + c2 (h-1) = 0c1 (h+1) + c2 (3-2h) = 0.

For the vectors to be linearly dependent, we have to check whether the system of equations above has non-trivial solutions, i.e. solutions where c1 and c2 are not both zero (when both are zero, we get the trivial solution).

From the first equation: c1 (h-1) + c2 (2h-1) = 0⇒ c1 (1-h) = c2 (2h-1)If h = 1, then both sides of the equation become 0. Thus, any value of c1 and c2 will satisfy this equation. Therefore, for h = 1, BOA and BOB are linearly dependent.  Answer: h = 1.

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The wavelength of the incident light which shines from a monochromatic source is 612 nm.

Wavelength is nothing but the distance between two consecutive waves. It is measured in metres.

Given that, the distance between the screen and the slit = 5 m

Slit width d = 0.180 mm

Width of the fringe β = 1.7 cm = 0.017 m

Wavelength λ = ?

The relation between β, d, x and wavelength is β = (x* λ)/d

Making wavelength λ as subject, we have,

λ = (β* d)/x = (0.017* 0.180* 10⁻³)/5 = 6.12* 10⁻⁷ = 617 nm

Thus, the wavelength of the incident light is 612 nm.

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The best sketch of several rays from the sun incident on the magnifying glass on a clear, sunny day would be Figure (A).

In Figure (A), we can assume that parallel rays of sunlight are incident on the magnifying glass. This is because the sun is far away, and its rays can be considered parallel when they reach the Earth's surface.

The magnifying glass, being a convex lens, focuses these parallel rays of light onto a single point called the focal point.

This is the basic principle of a magnifying glass, which allows it to concentrate sunlight and create a focused image. The other figures might not represent the correct behavior of sunlight and the magnifying glass.

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I'm gonna have to guess B) Automation sorry if I get it incorrect

Answer:

the direction of the angular velocity of the wheels is north  

Answer:

9.45 m/s

Explanation:

The actual percentage decrease in the perimeter is 13%, not 25%. While it is true that 15% + 10% is 25%, this is not the correct way to calculate the overall percentage decrease in the perimeter.

To see why this is the case, let's first calculate the original perimeter of the rectangle. The formula for the perimeter of a rectangle is:

P = 2L + 2W

where P is the perimeter, L is the length, and W is the width. Plugging in the given values, we get:

P = 2(60) + 2(40) = 120 + 80 = 200 cm

Now let's calculate the new dimensions of the rectangle after the length and width have decreased by 15% and 10%, respectively. To do this, we need to find 15% of 60 and 10% of 40:

15% of 60 = 0.15 x 60 = 9 cm
10% of 40 = 0.1 x 40 = 4 cm

So the new length is:

60 - 9 = 51 cm

And the new width is:

40 - 4 = 36 cm

Now we can calculate the new perimeter using the same formula as before:

P' = 2(51) + 2(36) = 102 + 72 = 174 cm

So the new perimeter is 174 cm. To find the percentage decrease in the perimeter, we can use the formula:

% decrease = (original value - new value) / original value x 100%

Plugging in the values we just calculated, we get:

% decrease = (200 - 174) / 200 x 100% = 13%

So the actual percentage decrease in the perimeter is 13%, not 25%. While it is true that 15% + 10% is 25%, this is not the correct way to calculate the overall percentage decrease in the perimeter.

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Answer:

Explanation:

f

=

v

λ

where v is the velocity of the wave

λ

is the wavelength.

Answer:

A. The average kinetic energy decreased.

Explanation:

When an object gains heat, which is a form of energy, the atoms within the object would in turn gain energy in the form of kinetic energy. Similarly, as the temperature of an object decreases, in other words losing heat energy, the atoms within the object would lose kinetic energy as a result.