a car of mass 1100 kg moves at 20 m/s. . a) what is its stopping distance? b) if the same car is moving at 40 m/s, what is its stopping distance?

Answer:

2.05 Ω

Explanation:

We are here given that the

We need to find out the resistance of the given wire . As we know that,

[tex]\implies R = \rho \dfrac{l}{A} \\[/tex]

[tex]\implies R =\rho \dfrac{ l}{\pi r^2} \\[/tex]

[tex]\implies R =\rho \dfrac{l}{\pi \dfrac{d^2}{4}} \\[/tex]

[tex]\implies R =\rho \dfrac{4l}{\pi d^2}\\[/tex]

substitute the respective values,

[tex]\implies R = 1.720 \times 10^{-8}\times \dfrac{4\times 5000m}{3.14\times (0.74\times 10^{-2}} \\[/tex]

[tex]\implies\underline{\underline{ R = 2.05 \Omega }} \\[/tex]

and we are done!

The solvents that will be in the top layer are hexane, methylene chloride and ether.

What are solvents?

A solvent is a substance in which other substances are dissolved to form a solution. Solvents play a crucial role in many chemical processes and are used in a variety of applications such as cleaning, paint thinning, and extractions. Solvents can be either polar or non-polar, and this polarity determines the solubility of other substances in the solvent.

When two solvents are mixed, they can be either immiscible, meaning they do not mix and form separate layers, or miscible, meaning they mix and form a homogeneous solution. The relative density of the solvents will determine which solvent will be in the top layer.

a. hexane and water are immiscible, and hexane would be in the top layer.

b. methylene chloride and water are immiscible, and methylene chloride would be in the top layer.

c. ethanol and water are miscible, meaning they can form a homogeneous mixture.

d. ether and water are immiscible, and ether would be in the top layer.

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1.573 m/s² is the magnitude, in meters per squared second, of the car's average acceleration during the given time period.

Using given numerical values:

a_avg = ((v₁x - v₀x)/ Delta t) i + (v₁y/ Delta t) j

a_avg = (37 - 39)/2.9 i + 4.1/2.9 j

a_avg = -0.690 i + 1.414 j

Magnitude of average acceleration will be:

|a_avg| = √ ((-0.690)² + 1.414²)

|a_avg| = 1.573 m/s²

The greatest size and direction of an item are referred to as the object's magnitude in physics. Vector and scalar values both employ magnitude as a common denominator. Scalar quantities are understood to be those that have only magnitude, according to their definition. Vector quantities, on the other hand, are those that have both magnitude and direction.

Magnitude may be used in a number of different contexts. To name a few of them:

seismic event's strength

Dimension of an electron's charge

force's magnitude

Distance in magnitude

the gravitational force's strength.

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The complete question is:

Give a vector expression for the average acceleration of the car during the given time period in terms of the variables in the problem and

unit vectors i and j.

a_ave = (V₀x + V₁x) i + (V₁y) j/Δt

Part (b) What is the magnitude of the car's acceleration during the time period in question, in m/s²?

The compound is created when two unidentified components combine. The material is malleable and glossy. The chemical will likely highly conductive in solution and have high melting and boiling points.

Choice B is correct as a consequence.

The solid's malleability refers to its capacity to flex or otherwise be hammered together into different form without cracking. If a substance is malleable, it may be rolled or hammered into something akin to a fine layer without being used.

Malleability is the capacity of a material, often metal, to be bent as well as molded into a new shape.

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The earth rotate because earth is formed from cold gases.

The earth rotate because it makes up more than 99% of the mass of the solar system since it was created by cold gases collapsing under the influence of gravity, spinning material in the nebula that created it, and fusion of hydrogen atoms into helium in the nebula.

Earth rotates because the sun draws it and pulls it towards it. In addition, because of the earth's revolution around the sun, it tends to move away from the sun in the direction of the tangent, creating a rotating force (torque) that pulls the earth towards rotation.

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A hiker walking with an average speed of 1.5 m/s would travel a distance of 2.55 kilometers in 1.7 hours.

This can be calculated using the equation Distance = Speed x Time, or D = S x T. Substituting the given values, we get D = 1.5 m/s x 1.7 hours = 2.55 kilometers.

Speed is a scalar quantity that refers to how quickly an object is moving. It is typically measured in meters per second (m/s). Speed is related to how much distance an object covers over a given amount of time. The faster an object moves, the greater the distance it covers in a given amount of time, and thus the greater its speed. Speed can also be measured in other units, such as miles per hour (mph).

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8 kw of shaft work is done on a system while 3 kw of heat is lost from the system. 5 kW  is the rate of energy change of the system.

The rate of energy change of the system can be calculated by subtracting the amount of heat lost from the system from the amount of shaft work done on the system.  while 3 kw of heat is lost from the system. 5 kW  is the rate of energy change of the system.

So, the rate of energy change of the system can be calculated as follows:

Energy change = Shaft work - Heat loss

Energy change = 8 kW - 3 kW

Energy change = 5 kW

So, the rate of energy change of the system is 5 kW.

8 kw of shaft work is done on a system while 3 kw of heat is lost from the system. 5 kW  is the rate of energy change of the system.

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Heat the saucepan after the wine has been added. Growing molecular collisions that defeat the forces of intermolecular attraction. A portion of the wine starts to boil away almost instantly.

Example: The polar H2O molecules are drawn to the sodium and chloride ions in the beaker when NaCl and water are combined there. This interaction's potency is determined by: how big the dipole moment is.

What draws molecules together?

Polar molecules line up so that their positive ends interact with each other's negative ends. Unlike the atoms' covalent bonds in a molecule (intramolecular bonding)

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A. The initial PE of the tire is 200 Joules (PE = mgh = 10 kg x 20 m x 9.8 m/s² = 200 J).

B. The kinetic energy of the tire at the bottom of the hill is 200 Joules (KE = PE = 200 J).

C. The speed of the tire at the bottom of the hill is 14.4 m/s (KE = ½ mv² = 200 J, so v = √(2KE/m) = √(400/10) = 14.4 m/s).

What is K.E.?

Kinetic energy is the energy an object has due to its motion. It is defined as the work needed to accelerate an object of a given mass from rest to its stated velocity. It is calculated by multiplying half the object's mass by the square of its velocity. Kinetic energy is a scalar quantity, having magnitude but no direction.

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The displacement y of a wave travelling in the x-direction is given by y=10−4sin(600t−2x+2π) metres.

Where x is expressed in metre and t in second.

What is motion?

It should be noted that when the wave is travelling in the positive x-direction, the equation for the wave is given as y=Asin(kx−ωt).

But if this wave is travelling in the negative x-direction then the wave equation is given as y=Asin(kx+ωt)

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If the equipment and the scope are both grounded, reconnecting the scope connection might enable measurement, but only for high- or low-frequency signals.

Therefore, if a wave passes through in a half second, the rate is 2 every second. The rate is 100 times per hour if it occupies 1/10 of an hour. The number of full oscillations that any wave element makes in one unit of time is the frequency of the a sinusoidal wave.

To communicate with one another, humans utilise signals, which can be either gestures or messages. giving a close friend a wave.

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If an airplane is flying supersonic, its speed creates a cone-shaped disturbance of compressed air known as a Mach cone. The angle of the Mach cone is dependent on the airplane's speed relative to the speed of sound. If the airplane's speed decreases while it is still supersonic, the Mach cone angle will widen.

When an airplane travels faster than the speed of sound, it generates a Mach cone. The Mach cone is created by the compression of the air in front of the airplane as it moves through the air. The Mach cone's angle depends on the airplane's speed relative to the speed of sound.

If the airplane's speed decreases while it is still supersonic, the Mach cone angle will increase or become wider. This is because the Mach cone angle is inversely proportional to the airplane's speed. The slower the airplane travels, the wider the Mach cone angle becomes.

The Mach cone angle is an important consideration in supersonic flight because it affects the aerodynamics and stability of the airplane. A wider Mach cone angle can lead to increased drag, which can affect the performance of the airplane. This is why monitoring and controlling the Mach cone angle during supersonic flight is important.

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Answer:

Explanation:

If air resistance is ignored , then there is no acceleration in horizontal direction in projectile motion.

Answer:

2N

Explanation:

works one=force/weight

10N/5m

2N

On the off chance that you spin the yo-yo head in an even circle, you should apply force toward the circle's middle. This force is known as the centripetal force.

The centripetal force continually pulls the yo-yo towards the center of the circle, keeping it moving in a round movement.

The power that conveys the centripetal force to the yo-yo is the pressure in the string.

The string, which pulls the yo toward the circle's middle, gives the centripetal force important to keep up with movement. The string is focused on because of the heaviness of the yo-yo and the speed at which it turns.

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The cell boundary's net flux measures -0.887 [tex]Wb.m^{2}[/tex] in both magnitude and direction (inward or outward).

Any impact that seems to flow through or move through a surface or substance is referred to as a magnetic flux. The following formulas are used to determine the size and direction (inward or outward) of the net flux through the cell boundary:

Ф = Q/ε, where:

Q is the net charge

ε is the permittivity of free space.

As per the question,

Φ = (-7.85 x 10⁻¹²)/ (8.85 x 10⁻¹²)

Φ = - 0.887 Wb.m²

The negative sign here indicates the outward flow of the flux. Magnetic flux is a measure of the strength of a magnetic field over a specific area, to put it simply. It has [[tex]ML^{2} T^{-2} A^{-1}[/tex]], as the dimension of mass length squared per square of time and electric current.

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Complete question is:

The human nerve cells have a net negative charge and the material in the interior of the cell is a good conductor. if the cell has a net charge of - 7.85 pc, what are the magnitude and direction (inward or outward) of the net flux through the cell boundary.

Answer:

The time it takes for an object to hit the ground depends on its vertical velocity, which is determined by the force of gravity. In this scenario, the vertical velocity of the baseball is determined by its initial vertical velocity (0 m/s) and the acceleration due to gravity (-9.8 m/s^2). The vertical displacement of the baseball can be found using the equation:

d = v_0t + 0.5at^2

where d is the vertical displacement (0.8 m), v_0 is the initial vertical velocity (0 m/s), t is the time, and a is the acceleration due to gravity (-9.8 m/s^2).

Rearranging the equation and solving for t:

t = √(2d/a)

t = √(2 * 0.8 / -9.8)

t = 0.44 seconds

So it takes the baseball 0.44 seconds to hit the ground.

The tension force in the rope must withstand a force of 12,270 N to accelerate the 1110-kg car horizontally at 1.20 m/s^2 along a frictionless surface.

The tension force in the rope must be equal to the gravitational force plus the net force required to accelerate the car horizontally.

The equation for this can be determined using Newton's second law of motion, which states that the net force acting on an object is equal to its mass times acceleration (F = ma).

Given that the car has a mass of 1110 kg and is being accelerated at a rate of 1.20 m/s^2, the net force can be calculated as follows:

F = ma = 1110 kg * 1.20 m/s^2 = 1332 N

Since the surface is frictionless, the only force acting against the car is gravity. The gravitational force acting on the car can be calculated using the equation:

Fg = m * g

where m is the mass of the car (1110 kg) and g is the acceleration due to gravity (9.8 m/s^2).

Fg = 1110 kg * 9.8 m/s^2 = 10,938 N

Therefore, the tension force in the rope must be equal to the sum of the gravitational force and the net force, or:

Tension force = F + Fg = 1332 N + 10,938 N = 12,270 N

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Answer:pizza party

Explanation:

The thermal contact resistance can be viewed as being in series. The resistance due to the direct contact locations at the interface and the resistance due to the gaps are both contributing to the overall thermal resistance of the interface.

The thermal resistance of the interface is the sum of the resistances of all the components in the thermal path. If the direct contact resistance and the gap resistance were in parallel, they would have an additive effect on the overall thermal resistance, but that is not the case for thermal contact resistance.

Thermal resistance is a measure of the ability of a material or system to resist the flow of heat. It is defined as the ratio of the temperature difference across the material to the heat flux through it.

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Answer:

It depends on the amount of pressure needed to cut the material.

Iron is a tougher material to cut though, so the blades must be shorter to create more pressure to break through the iron.

Cloth on the other hand is easier to cut through so the blades can be longer in order to cut more in each snip.

Explanation:

The car stopping short is the unbalanced force.

A force is an influence that can change the motion of an object. A force can cause an object with mass to change its velocity to accelerate. Force can also be described intuitively as a push or a pull. A force has both magnitude and direction, making it a vector quantity. It is measured in the SI unit of newton (N). Force is represented by the symbol F.

When the resultant force acting on a body is not equal to zero, the forces acting on the body are known as unbalanced forces. The body acted upon by unbalanced forces changes its state of motion.

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a) More than 13% of cats would weigh more than 12 kg.

b) Between 7.2 kg and 9.8 kg of mass would be found in 39.68% of cats.

A measuring of an object's gravitational characteristic, or the quantity of matter it includes, is the object's mass. The gravity forces acting on an object or the force required to carry it is measured by the weight of the thing. An object's downward acceleration due to gravity on earth is roughly 9.8 m/s2.

a) P( x > 12 ) = 1 - P( x < 12 )

= 1 - P[(x - \mu) / \sigma < (12 - 10) / 1.8)

= 1 - P(z < 1.11)                                  

= 1 - 0.8665

= 0.1335

Percentage = 13.35%

b)  P(7.2 < x < 9.8) = P[(7.2 - 10) / 1.8) < (x - \mu) /\sigma  < (9.8 - 10) / 1.8) ]

= P(-1.56 < z < -0.11)

= P(z < -0.11) - P(z < -1.56)

= 0.4562 - 0.0594

= 0.3968

Percentage = 39.68%

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The thrusters must operate for 50 seconds to increase the velocity of the probe to 420 miles per minute.

What is velocity?

Velocity is a vector quantity that measures the rate of change in an object’s position. It is defined as the rate of change of displacement, or the rate of change of an object’s position over time. It has both magnitude, which is the speed of the object, and direction, which is the direction the object is traveling.

To answer this question, we must first calculate the change in velocity that is needed to bring the probe up to its desired speed of 420 miles per minute. We can do this by subtracting the current velocity of the probe from 420 miles per minute. For example, if the current velocity of the probe is 350 miles per minute, the change in velocity needed is 70 miles per minute (420 - 350 = 70).

Next, we need to calculate the thrust force that the thrusters must generate to achieve the desired change in velocity. This can be calculated using the equation Force = Mass x Acceleration, where Mass is the mass of the probe and Acceleration is the desired change in velocity divided by the time period in which it is achieved. For example, if the mass of the probe is 500 kg and the desired change in velocity is 70 miles per minute, the acceleration needed is 0.14 m/s2 (70 miles per minute / 500 kg = 0.14 m/s2).

Finally, we can calculate the amount of time that the thrusters must operate to achieve the desired change in velocity. This can be calculated using the equation Time = Force / Acceleration, where Force is the force generated by the thrusters and Acceleration is the desired change in velocity divided by the time period in which it is achieved. For example, if the thrusters generate a force of 1000 Newtons and the desired change in velocity is 70 miles per minute, the time required to achieve this is 50 seconds (1000 Newtons / 0.14 m/s2 = 50 seconds).

Therefore, in this example, the thrusters must operate for 50 seconds to increase the velocity of the probe to 420 miles per minute.

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The required work done in stretching the spring from its natural length to the specified length is calculated to be 105.63 lb.in.

The spring is stretched for 8 in.

The force the spring holds is 10 lb.

The spring is being stretched from its natural length to 13 in.

Work done is calculated to be = ?

The relation between force, spring constant and extension is,

F = k x

Making k as subject, we have,

k = F/x = 10/8 = 1.25 lb/in

The work done in stretching from natural length to 13 in is,

W = 1/2 k x² = 1/2 (1.25) 13² = 105.63 lb.in

Thus, the required work done is calculated to be 105.63 lb.in.

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Our simple expression for the canoe's relative velocity to the river is vc/r=( x, y). When compared to the earth, the river is moving at a vr/e= angle (0.54,0). vc/e=(0.55cos(45),0.55sin(45)) is the canoe's angle to the earth.

Magnitude is simply "distance or quantity," according to the definition given in physics. It shows how an object moves when it is in motion, whether that movement is absolute, relative, or of a certain size. It serves as a way to describe something's size or scope.

Scalar values serve as measurement units, and scalar multiplication provides the definition of magnitude. The original quantity is equal to the magnitude of a quantity multiplied by the supplied unit. This is true for all types of tensors, including.

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The ball is 10 feet off the ground, it has a climbing velocity of 1.33 feet/second. 

Using the equations of motion for motion, we can solve for the upward velocity of the ball when it is 10 feet off the ground.

Let's assume the positive direction is up. We know that it takes 30 seconds for the ball to bounce off the ground, so the total time the ball is in the air is 60 seconds (30 seconds up + 30 seconds down).

Using the equations of motion relating displacement, initial velocity, final velocity, acceleration, and time, we get:

displacement = (final velocity + initial velocity) / 2 * time

When the ball reaches its maximum height, its final velocity is 0. The initial velocity of the ball when it is 10 feet off the ground can be solved for:

10 feet = (0 feet/sec + v0) / 2 * (30 seconds / 2)

where v0 is the initial upward velocity of the ball. Solving for v0 gives:

v0 = 10 feet / (15 seconds / 2) = 1.33 feet/second

So if the ball is 10 feet off the ground, it has a climbing velocity of 1.33 feet/second. 

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Answer:

gallium ion has 31 electrons

titanium ion has 20 electrons

The weight of an object with a mass of 665 N on the surface of the neutron star significantly higher than on Earth, due to the much stronger gravitational pull of the massive neutron star is [tex](6.67 x 10^-11 m^3 / kg s^2)[/tex].

The weight of an object on the surface of a celestial body depends on its mass and the gravitational force acting on it. The equation for the force of gravity is given by[tex]F = G * (m1 * m2) / r^2,[/tex] where G is the gravitational constant, m1 and m2 are the masses of the two objects, and r is the distance between their centers.

To calculate the weight of an object on the surface of a neutron star with the same mass as the sun and a diameter of 17.0 km, we need to first find the mass of the neutron star and then the radius. The mass of the neutron star can be taken to be the same as that of the sun, which is approximately [tex]1.989 x 10^30[/tex]  kilograms.

Next, we can use the formula for the radius of a sphere to find the radius of the neutron star: [tex]r = (3 * M) / (4 * pi * density)[/tex], where M is the mass of the neutron star and density is the average density of the star. The density of a neutron star is extremely high, on the order of several times that of atomic nuclei. For a neutron star with the same mass as the sun and a diameter of 17.0 km, the radius can be calculated to be about 5.6 km.

Finally, we can use the equation for the force of gravity to find the weight of an object on the surface of the neutron star:

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

where m1 is the mass of the object (665 N), m2 is the mass of the neutron star (1.989 x 10^30 kilograms), r is the radius of the neutron star (5.6 km), and G is the gravitational constant[tex](6.67 x 10^-11 m^3 / kg s^2)[/tex].

The weight of an object with a mass of 665 N on the surface of the neutron star would be significantly higher than on Earth, due to the much stronger gravitational pull of the compact and massive neutron star.

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The wrong statement about size of temperature unit is 1 Celsius degree is bigger than 1 Kelvin (b)

The answer choices should have as follow :

A. 1 kelvin is bigger than 1 fahrenheit degree

B. 1 celsius degree is bigger than 1 kelvin

C. 1 celsius degree is bigger than 1 fahrenheit degree

D. 1 celsius degree is equal to 1 kelvin.

The temperature is measured using three different scales, Fahrenheit, Celsius, and Kelvin. 

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