When walking barefoot, Kevin can walk across the grass easily, but when he crosses the paved street, the street is hot and burns his feet. At the beach he walks quickly across the hot sand to the cool water. Why do some substances feel hot to his feet and others do not? Radiation is heat transfer through waves. Specific heat is the amount of energy required to raise the temperature of a substance 1 degree C.​

Answer:

22

Explanation:

Answer: A negative value is values and frequency for the data you are analyzing had enough negative values. Sometimes distance can be negative. For example, when you are in the pool, underwater, or standing left from the middle of origin.

Explanation:

Answer:

A wave that transmits speech, music, and other signals

Explanation:

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Answer:

a wave that transmits speech, music, and other signals :)

Explanation:

Answer:

the glass and paper have diffrent charges

Explanation:

if the glass is charged positively then the paper was charged negatively

the to charges were to attract think of it as a magnet

Answer:

A and d

Explanation:

Answer:

answer in picture

Explanation:

Given:

The initial position of the bike, x_i=-300 m

The final position of the bike, x_f=900 m

The time it takes for the bike to move to the final position, t=2 min=120 s

To find:

The speed of the bike.

Explanation:

The speed of an object is the time rate of change of distance.

That is the speed of an object is given by the ratio of the distance to the time.

Thus the speed of the bike is given by,

On substituting the known values,

Final answer:

The average speed of the bike is 10 m/s

When the distance between two objects is doubled, the gravitational force between them is reduced by one-fourth.

Newton's law of gravitation states that an object attracts every other object in the universe with a force that is directly proportional to the product of their masses and inversely proportionate to their square distances from one other. This force may be thought of as gravitational attraction.

So, when we double the distance between the two objects then force will get reduced to one-fourth as according to newton's law of gravitation, force is inversely proportional to the square of the distance between them.

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Answer:

The speedometer of a car shows its instantaneous speed (as we understand it) and not the average speed. Technically, instantaneous speed is also average speed, but calculated over a very, very small time period. Speed is nothing but a ratio of distance traveled and time taken.

Answer:

Explanation:

First part of the journey;

If the car starts from rest, then accelerates at 1.20 m/s^2 for 7.00 s, the total time taken during this period is 7.0s.

But then  lets get the velocity v of the car during its first part of the journey.

Using the formula v1 = u1+ at1

v = 0+1.2(7)

v = 8.4m/s

Second part of the journey is when the driver hits the brake and slowing to stop at a rate of -4.25 m/s^2. To calculate the time it takes by the body to decelerates, we will use the equation of motion v2 = u2 + at2

v = final velocity of the car during the second part of the journey

u = initial velocity of the car during the second part of the journey

a = deceleration

t = time taken

Given v2 = 0m/s, u2 = 8.4m/s, a = -4.25m/s²

0 = 8.4-4.25t2

4.25t2 = 8.4

t2 = 8.4/4.25

t2 = 1.98secs

Total time taken for the journey = t1+t2

= 7.0s + 1.98s

= 8.98secs

1) The direction it points depends on the direction of the electric current in the wires.

2) The magnetic field lines in the region would form circles around each individual wire carrying current.

3) This is because of the right-hand rule

The magnetic field produced by the electric current forms a circular magnetic field around the wire in accordance with the right-hand rule, which is applicable to conventional current flow.

The current's flow direction determines the direction of the magnetic field lines. The curled fingers of your right hand, which is holding the wire with your thumb pointing in the direction of the current flow, would point in the direction of the magnetic field.

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Answer:

The motorcyclist is 55 miles east of the small town.

Explanation:

Motion With Constant Acceleration

It's a type of motion where the velocity of an object changes uniformly in time.

The equation that rules the change of velocities is:

\(v_f=v_o+at\qquad\qquad [1]\)

Where:

a   = acceleration

vo = initial speed

vf  = final speed

t    = time

The distance traveled by the object is given by:

\(\displaystyle x=v_o.t+\frac{a.t^2}{2}\qquad\qquad [2]\)

Using the equation [1] we can solve for a:

\(\displaystyle a=\frac{v_f-v_o}{t}\)

Solving [1] for t and substituting into [2] we get the following equation:

\(V_f^2=V_o^2+2aX\)

The motorcyclist has an acceleration of a=4\ m/s^2 and an initial distance of 5 m where he travels at vo=15 m/s.  It's required to calculate the distance when the speed is vf=25 m/s.

Solving the last equation for X:

\(\displaystyle X=\frac{V_f^2-V_o^2}{2a}\)

Substituting:

\(\displaystyle X=\frac{25^2-15^2}{2*4}\)

\(\displaystyle X=\frac{625-225}{8}\)

X = 50 m

Adding the initial distance:

The motorcyclist is 55 miles east of the small town.

The equivalent resistance between points A and B in the diagram is 22 Ω

We shall begin by obtaining the equivalent resistance in parallel (i,e the three 6 Ω resistor). Details below:

1/Rₜ = 1/R₁ + 1/R₂ + 1/R₃

1/Rₜ = 1/6 + 1/6 + 1/6

1/Rₜ = 3/6

1/Rₜ = 1/2

Rₜ = 2 Ω

Finally, we shall determine the equivalent resistance between A and B (i.e series arrangement). Details below:

R = R₁ + R₂ + R₃ + R₄ + R₅ + R₆ + R₇ + R₈ + R₉ + R₁₀ + R₁₁

R = 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2

R = 22Ω

Thus, we can conclude that the equivalent resistance is 22 Ω

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Answer:

0.125

Explanation:

acellus

Engine and brake traction control systems keep you from having to replace the brakes as often.

The traction  control  uses the brakes and the torque of the engine to control the spin of the driving wheels.

As maximum of the burden is pulled up by the engine and brake traction control systems, this helps in keeping the brakes of the car protected.

The engine and the brake traction control systems provide stability as well as maximum traction due to which the brakes do not have to be replaced as often.

Brake traction control detects braking force to the wheels that need it hence increasing the torque on that particular wheel.

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While negative point charges always move in the direction of the opposing electric field, positive point charges always move in the other direction. An electric field is a vector quantity. They cannot be added directly, but they can be vectorially inserted.

A physical field called an electric field surrounds electrically charged particles and attracts or repels all other charged particles nearby. It can also refer to the physical field surrounding a system of charged particles.

While negative point charges always move in the direction of the opposing electric field, positive point charges always move in the other direction. An electric field is a vector quantity.

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The lighter block will also accelerate to the right with an acceleration of -0.82 m/s².

(a) μ = 0

The heavier block will accelerate to the right with an acceleration of:

a = F / m = k x / m = (3.70 N/m) (0.0864 m) / 0.261 kg = 1.22 m/s²

The lighter block will also accelerate to the right with an acceleration of 1.22 m/s².

(b) μ = 0.110

The heavier block will accelerate to the right with an acceleration of:

a = F - μk / m = k x / m - μk / m = (3.70 N/m) (0.0864 m) / 0.261 kg - (0.110)(0.261 kg)(9.80 m/s²) = 0.68 m/s²

The lighter block will not accelerate because the force of friction is greater than the force of the spring.

(c) μ = 0.480

The heavier block will accelerate to the right with an acceleration of:

a = F - μk / m = k x / m - μk / m = (3.70 N/m)(0.0864 m) / 0.261 kg - (0.480)(0.261 kg) (9.80 m/s²) = -0.82 m/s²

Therefore, the lighter block will also accelerate to the right with an acceleration of -0.82 m/s².

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The direct path and direction from point A to B is called "Displacement". (Option D).

Displacement is described as a change in an object's location. It is a vector quantity with a magnitude and a direction. It is depicted as an arrow pointing from the starting point to the ending point.

For instance, if an object travels from A to B, the object's location changes. Displacement is the change in the location of an item.

The mathematical expression of displacement is given as:

Δx = xf  - x₀; Where

xf = Final Position

x₀ =  Initial position; and

Δx = displacement.

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Answer:

Explanation:

For every action (or force), there is an equal and opposite action (or force).

The weight of a \(45 kg\) box is \(441.45 N\).

Weight refers to the measure of the force exerted on an object due to the gravitational pull of the Earth.

Given the mass of the box is \(m=45 kg\).

The weight of an object (\(W\)) can be found by multiplying the mass of the object (\(m\)) by the acceleration due to gravity (\(g\)).

So, \(W=mg\).

It is known that acceleration due to gravity, \(g=9.81 m/s^2\).

Hence, the weight of the box, \(W=(45kg)\times (9.81 m/s^2)\).

\(\Rightarrow W=441.45 (kg\cdot m/s^2)\\\Rightarrow W=441.45 N\)

Therefore, the weight of the box is \(441.45 N\).

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Answer:

it's the turning effect of force; the product of force and perpendicular distance from line of action of the force to the pivot . Depends on two factors: size of force applied and perpendicular distance from pivot to line of action of the force

Answer:

The magnification of the spoon is approximately 0.39

Explanation:

To determine the magnification of the spoon, we can use the lens formula:

1/f = 1/v - 1/u

Where:

f = focal length of the lens (convex lens in this case)

v = image distance from the lens

u = object distance from the lens

Given:

f = -6.50 cm (negative because it is convex)

u = 5.00 cm

Substituting the given values into the lens formula:

1/-6.50 = 1/v - 1/5.00

Simplifying:

-1/6.50 = 1/v - 1/5.00

To solve for v, we need to find a common denominator:

-5/32.50 = (5 - 6.50)/ (5v)

-5/32.50 = (-1.50)/ (5v)

Cross-multiplying:

-5 * 5v = -32.50 * -1.50

-25v = 48.75

Dividing both sides by -25:

v = 48.75 / -25

v = -1.95 cm

Now, we have the image distance (v), which is approximately -1.95 cm. To find the magnification (M), we use the formula:

M = -v/u

Substituting the values:

M = -(-1.95 cm) / 5.00 cm

M = 0.39

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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Answer:

The mass is 1200 kilograms

Explanation:

Because Force is equal to mass times acceleration (F=m×a)

F=m×a

1800N=?×1.5

1800÷1.5=1200

1800N=1200Kg×1.5

Answer:

La densidad del tetracloruro de carbono es 1.990 gramos por centímetro cúbico.

Explanation:

La masa de agua contenida dentro de la botella es igual a la diferencia entre la masa pesada totalmente llena y la masa pesada totalmente vacía, es decir:

\(m_{w} = 86.55\,g-24.25\,g\)

\(m_{w} = 62.3\,g\)

Ahora, de acuerdo con la definición de densidad, la masa es directamente proporcional a la densidad, entonces, podemos calcular la densidad del solvente mediante la siguiente relación:

\(\frac{m_{x}}{m_{w}} = \frac{\rho_{x}}{\rho_{w}}\) (1)

Donde:

\(m_{x}\) - Masa del tetracloruro de carbono, en gramos.

\(m_{w}\) - Masa del agua, en gramos.

\(\rho_{x}\) - Densidad del tetracloruro de carbono, en gramos por centímetro cúbico.

\(\rho_{w}\) - Densidad del agua, en gramos por centímetro cúbico.

Si sabemos que \(m_{x} = 123.95\,g\), \(m_{w} = 62.3\,g\) y \(\rho_{w} = 1\,\frac{g}{cm^{3}}\), entonces la densidad del tetracloruro de carbono es:

\(\rho_{x} = \left(\frac{m_{x}}{m_{w}} \right)\cdot \rho_{w}\)

\(\rho_{x} = 1.990\,\frac{g}{cm^{3}}\)

La densidad del tetracloruro de carbono es 1.990 gramos por centímetro cúbico.

The magnetic field at the center of a current-carrying loop is given by the formula: B = (μ₀/4π) * (2I/ r)

where B is the magnetic field at the center of the loop, I is the current in the loop, r is the radius of the loop, and μ₀ is the permeability of free space. In this case, we are given the magnetic field B = 3.00 mT = 3.00 × 10^(-3)  T and the radius r = 0.700 cm = 0.00700 m.Substituting these values into the above formula, we can solve for the current I: I = (B * r * 4π)/ (2 * μ₀)

I = (3.00 × 10^(-3) T * 0.00700 m * 4π)/ (2 * 4π × 10^(-7) T·m/A)

I = 0.0133 A

Therefore, the current in the loop is 0.0133 A (amperes).

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Answer:

V = 5 m³

Explanation:

The density of air, d = 1.2 kg/m³

Mass of the dry air, m = 6 kg

We need to find the volume o the gas. We know that, the density of an object is given by mass divided by its volume. So,

\(d=\dfrac{m}{V}\\\\V=\dfrac{m}{d}\\\\V=\dfrac{6}{1.2}\\\\V=5\ m^3\)

So, the volume of the dry air is 5 m³.

Answer:

This question is incomplete, the options are:

A) The object absorbs most white light and refracts most green light.

B) The object refracts most white light and absorbs most green light.

C) More green light is absorbed while more red and blue light is reflected.

D) More green light is reflected while more red and blue light is absorbed.

The answer is D.

Explanation:

Light is an electromagnetic wave that contains different colours at different wavelength. The colour of light that is seen depends on the wavelength of light that is REFLECTED, while other wavelengths of light are ABSORBED. This feature is dependent on the properties of each object that received the sunlight.

For example, an object will appear GREEN because it has properties that enables it to REFLECT most of the GREEN LIGHT but absorbs most of the RED AND BLUE LIGHT in the sunlight passing through the object.

Answer:

D

Explanation:

More green light is reflected while more red and blue light is absorbed.

The linear displacement of the wheel will be 1.5m.

Linear displacement is the measure of straight path covered by the object .

Rotating angular speed of the wheel = 2.0 rad/s

Radius of the wheel = 0.25 m

According to the angular speed and linear speed relationship, we can say that linear speed is the product of angular speed and the the radius of the object

V = linear velocity

r = radius of the wheel

ω = angular velocity

V = 0.25 * 2

V = 0.5 m/s

Also, speed is equal to distance upon time.

V = d/t

Time at wheel the the wheel's linear distance is to be found = 3 s

therefore d = V * t

d = 0.5 * 3

d = 1.5 m

The linear displacement of the wheel after 3.0 s is 1.5 m.

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The statement that illustrates how progress in engineering has affected the natural environment is extracting mineral resources with modern mining equipment removes fertile topsoil.

The natural environment may be defined as anything that can be present in the surroundings of living entities whether it is a biotic or abiotic factor.

The utilization of contemporary mining tools terminates fertile topsoil and admiringly impacts the fertility of the soil.  It is tough to rebuild topsoil and modern mining tools constantly damage soil fertility.

Advancement in engineering has influenced the natural environment and mining is one of the most accepted measures of this.

The complete question is as follows:

Therefore, it is well described above.

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