Pete roller skates with a constant speed of 8 miles per hour. How long will he take to travel a distance of 12 miles?

Answer:

The wave moves with a velocity of 37.5 m/s

Explanation:

We know that the speed of a wave is given by:

V = f*λ

Where f is the frequency (the inverse of the period)

Then:

f = 1/T

And we know that T = 2 s/cycle

f = 1/(2 s/cycle) = (1/2) cycle/s

And λ is the wavelength, we know that:

λ = 75m/cycle.

Then the speed of the wave is:

v = ( (1/2) cycle/s)*(75m/cycle) = (75/2) m/s = 37.5 m/s

Answer:

m

Explanation:

"1 watt" means 1 joule of energy per second.

75 W means 75 joules/sec .

Energy = (75 Joule/sec) x (12 min) x (60 sec/min)

Energy = (75 x 12 x 60) (Joule-min-sec / sec-min)

Energy = 54,000 Joules

Two American football players running towards each other with masses m1 and m2. Let m1 = 70 kg and m2 = 100 kg, respectively. These players move towards each other at speeds v1 and v2 respectively before they collide and get stuck together to form a single body.

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Answer:

The angular acceleration of the wheel is 3.357rad/s²

Explanation:

Given;

Diameter of the wheel, d = 0.8 m

radius of the wheel, r = 0.4 m

initial velocity of the wheel, u = 3 m/s

final velocity of the wheel, v = 6 m/s

number of revolutions of the wheel, N = 4 rev.

Convert the linear velocity in m/s  to angular velocity in rad/s;

v = ωr

ω = v / r

initial angular velocity, \(\omega_i = \frac{3}{0.4} = 7.5 \ rad/s\)

final angular velocity, \(\omega_f= \frac{6}{0.4} = 15\ rad/s\)

The angular acceleration of the wheel is calculated as;

\(\omega _f^2 = \omega_i^2 + 2 \alpha \theta\)

where;

α is the angular acceleration (rad / s²)

θ is the angular rotation (rad)

θ = Number of revolutions x 2π rad/rev

  =  4 rev. x 2π rad/rev

  = 25.136 rad.

\(\omega _f^2 = \omega_i^2 + 2 \alpha \theta\\\\2 \alpha \theta = \omega _f^2 - \omega_i^2\\\\\alpha = \frac{\omega _f^2 - \omega_i^2}{2 \theta} \\\\\alpha = \frac{15^2 -7.5^2}{2*25.136} \\\\\alpha = 3.357 \ rad/s^2\)

α = 3.357 rad/s²

Therefore, the angular acceleration of the wheel is 3.357rad/s²

The angular acceleration of the wheel is 3.36 rad/s²

The diameter is 0.8 m, hence:

radius = diameter / 2 = 0.8/2 = 0.4 m

The initial angular speed (ω₀) = v / r = 3 m/s / 0.4 m = 7.5 rad/s

The final angular speed (ω) = v / r = 6 m/s / 0.4 m = 15 rad/s

The angular displacement (θ) = 4 rev * 2π = 8π

ω² = ω₀ + 2αθ

15² = 7.5² + 2(8π)α

α = 3.36 rad/s²

The angular acceleration of the wheel is 3.36 rad/s²

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The centripetal force in Newtons provided by the friction between the blade of the skate and the ice is 490 N

The following data were obtained from the question:

The centripetal force can be obtained as illustrated below:

F = mv²/r

= (50 × 7²) / 5

= (50 × 49) / 5

= 2450 / 5

= 490 N

Thus, we can concluded that the centripetal force is 490 N

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Ritalin and Demerol are both controlled substances that have a high risk of abuse and dependence.

Schedule II drugs are believed to have a high abuse potential that could lead to severe psychological or physical dependence. They do, however, occasionally have other known medical applications and can be prescribed by a licensed healthcare provider.

Ritalin is an example of a stimulant, whereas Demerol is an example of an opioid. Thus the drugs that have been mentioned here are drugs that are strictly controlled.

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The most probable genotype of each parent is:

To determine the most probable genotype of each parent, we need to use the principles of Mendelian genetics and the observed phenotypes of the parents and offspring. We can use the letter G for the gray gene and g for the white gene.

For parent a (gray x white), we can write the genotypes as Gg (gray) x gg (white). All of the offspring are white, so they must have received a g allele from each parent. Therefore, the genotypes of the offspring are all gg. Using a Punnett square, we can see that the most probable genotype of the gray parent is Gg, and the white parent is gg.

For parent b (gray x gray), we can write the genotypes as GG (gray) x GG (gray). All of the offspring are gray, so they must have received a G allele from each parent. Therefore, the genotypes of the offspring are all GG. Since both parents are gray, they must both have the GG genotype.

For parent c (white x white), we can write the genotypes as gg (white) x gg (white). All of the offspring are white, so they must have received a g allele from each parent. Therefore, the genotypes of the offspring are all gg. Since both parents are white, they must both have the gg genotype.

For parent d (gray x white), we already determined the genotypes in parent a. Therefore, the most probable genotype of the gray parent is Gg, and the white parent is gg.

For parent e (gray x gray), we already determined the genotypes in parent b. Therefore, both parents must have the GG genotype.

In summary, the most probable genotype of each parent is:

a. Gg (gray) x gg (white)

b. GG (gray) x GG (gray)

c. gg (white) x gg (white)

d. Gg (gray) x gg (white)

e. GG (gray) x GG (gray)

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Answer:

60 kilometers per hr

Explanation:

Answer:

Forwarded

Explanation:

Do you have the answer for this question? so i can provide u solution more effectively

The time interval between the man clapping and hearing his echo is approximately 1.75 seconds.

An echo is a repetition or reflection of a sound or signal. It can be caused by sound waves bouncing off a surface, signal interference, or the repetition of a message in communication.

The speed of sound in air at room temperature is approximately 343 meters per second. When a person claps, the sound waves propagate outward in all directions and reach the school building, where they bounce off and return to the person as an echo. The time it takes for the sound to travel the distance to the building and back to the person is the time interval between the clap and the echo.

To calculate the time interval, we can use the following formula:

time = distance / speed

where distance is the total distance traveled by the sound (twice the distance from the person to the school building), and speed is the speed of sound in air.

distance = 2 x 300m = 600m

speed = 343 m/s

time = 600m / 343 m/s = 1.75 seconds (rounded to two decimal places)

Therefore, the time interval between the man clapping and hearing his echo is approximately 1.75 seconds.

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Answer:

Astronomers use computer models to simulate the process of galactic evolution through mergers and collisions. These models are based on our current understanding of the physical laws that govern the behavior of matter and energy in the universe. By running simulations of galactic mergers and collisions, astronomers can test their understanding of how these physical processes work in practice and how they contribute to the formation and evolution of galaxies.

One way that astronomers might test their understanding of the physical processes of the universe is by comparing the predictions of their models to observations of real galaxies. For example, if a model predicts that a particular type of galaxy should have a certain shape, size, or distribution of stars, astronomers can compare these predictions to observations of actual galaxies to see if they match up. If there is a discrepancy between the model's predictions and the observations, this can indicate that there are some physical processes that are not well understood or included in the model.

Another way that astronomers might test their understanding is by looking for patterns or trends in the properties of galaxies that are consistent with the predictions of their models. For example, if a model predicts that galaxies that have undergone a recent merger should have a particular distribution of gas and dust, astronomers can look for evidence of this pattern in observations of real galaxies. If they find that the predicted pattern is consistently observed in a large sample of galaxies, this can provide support for the model's predictions and the physical processes that it includes.

Overall, computer models of galactic evolution through mergers and collisions provide a powerful tool for astronomers to test their understanding of the physical processes of the universe. By comparing the predictions of their models to observations of real galaxies and looking for consistent patterns and trends, astronomers can refine their understanding of how galaxies form and evolve over time.

Answer:

(D)6 times

Explanation:

Hello !

Because when we see the equation of momentum P=mv, where p=momentum

m=mass of the object&

v=velocity of the object

And, p is directly propositional to both mass and velocity.

Thus, p=mv

Therefore, we can conclude by when the mass is tripled and the velocity is doubled the momentum is increased by 6 units.

The area of Mrs. Turner's apartment is approximately 0.05304 square feet.

To find the area of Mrs. Turner's apartment, we need to convert the measurements from the scale drawing to the actual measurements in feet, using the given scale factor of 1 inch/18 feet.

Length of apartment in feet = 6.25 inches × (1 foot/18 inches) = 0.34722 feet

Width of apartment in feet = 2.75 inches × (1 foot/18 inches) = 0.15278 feet

Now, we can calculate the area of the apartment in square feet by multiplying the length and width:

Area of apartment in square feet = Length × Width = 0.34722 feet × 0.15278 feet = 0.05304 square feet

Therefore, the area of Mrs. Turner's apartment is approximately 0.05304 square feet.

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The tension in each of the wires, number 1 and number 2, respectively

T_1=398.35

This is further explained below.

Generally, At equilibrium, in direction \($\Sigma F_y=0$\)

\(\Rightarrow T_2 \sin \theta_2-m g=0 \text {. }\)

\($\Rightarrow \quad T_2 \sin \theta_2=m g$\)

tension, \($T_2=\frac{m g}{\sin \theta_2}$\)

\(T_2=\frac{32.3 \times 9.81}{\sin (38.5}^{\circ})} \\\\T_2= {509.00} \mathrm{~N}$.\)

\(In x-dirn; $\quad \Sigma F_x=0 \Rightarrow T_2 \cos \theta_2-T_1=0$.\)

\(\Rightarrow T_1 &=T_2 \cos \theta_2 \\\)

\(T_1 &=509.00\times \cos (38.5^{\circ}\right) \\\\\)

T_1=398.35

In conclusion,  the tension in each of the cables, 1 and 2

T_1=398.35

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Here are five potential-kinetic energy conversions that could be shown in the construction of a device: Pendulum, Roller Coaster, Wind-up Toy, Elastic Slingshot, Windmill.

Pendulum: A pendulum consists of a weight attached to a string or rod, suspended from a fixed point. When the weight is lifted to a certain height, it possesses gravitational potential energy.

As the weight is released, it swings back and forth, converting the potential energy into kinetic energy. At the highest point of each swing, the weight briefly comes to a stop and has maximum potential energy, which is then converted back to kinetic energy as it swings downward.

Roller Coaster: In a roller coaster, potential-kinetic energy conversions occur throughout the ride. When the coaster is pulled up to the top of the first hill, it gains gravitational potential energy.

As the coaster descends, the potential energy is converted into kinetic energy, resulting in a thrilling and high-speed ride. Subsequent hills and loops continue to convert potential energy into kinetic energy and vice versa as the coaster moves along the track.

Wind-up Toy: Wind-up toys typically have a spring mechanism inside. When the toy is wound up, potential energy is stored in the wound-up spring. As the spring unwinds, it transfers its potential energy into kinetic energy, causing the toy to move or perform actions. The kinetic energy gradually decreases as the spring fully unwinds.

Elastic Slingshot: With an elastic slingshot, potential-kinetic energy conversions are evident when the slingshot is stretched. As the user pulls back on the elastic band, potential energy is stored.

Windmill: Windmills harness the kinetic energy of the wind and convert it into other forms of energy. As the wind blows, it imparts kinetic energy to the blades of the windmill. The rotating blades then transfer this kinetic energy into mechanical energy, which can be used for various purposes such as grinding grains or generating electricity.

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Wind Energy >> Uses groups of turbines to harness power from moving air, Solar Energy >>Can easily be harnessed by homeowners and businesses, Hydropower Energy >> Partly relies on the water cycle to provide its source and Biomass Energy >>Comes from organic plant and animal material

Wind Energy

Uses groups of turbines to harness power from moving air

It involves the use of wind turbines to convert the kinetic energy of moving air into electricity.

Solar Energy

Can easily be harnessed by homeowners and businesses

Homeowners and businesses can install solar panels on rooftops or open spaces to harness energy from the sun and convert it into electricity for their own use.

Hydropower Energy

Partly relies on the water cycle to provide its source

Hydroelectric power relies on the movement of water, driven by gravity, to spin turbines.

Biomass Energy

Comes from organic plant and animal material

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Answer:

hpqfie

Explanation:

wdq i love math WOOOOO

Answer:

0.238 m/min

Explanation:

The volume of water in the trough V =Ah' where A = area of cross-section = area of isosceles trapezoid = 1/2(a + b)h where a = length of bottom of isosceles trapezoid = 40 cm = 0.4 m, b =  length of top of isosceles trapezoid = 100 cm = 1 m and h = height of isosceles trapezoid = 60 cm = 0.6 m. So,

A = 1/2(a + b)h = 1/2(0.4 m + 1 m)0.6 m = (1.4 m)0.3 m = 0.42 m² and h' = height of water level in trough = H - h" where H = length of trough = 10 m and h" = depth of water level in trough = 10 cm = 0.1 m

So, V = Ah'

V = A(H - h") = A(10 - h")

Now, the rate of change of volume of the trough with respect to time dV/dt = d[A(10 - h")]/dt

dV/dt = -Adh"/dt

dh"/dt = -dV/dt/A

Since dV/dt = 0.1 m³/min, substituting the other variables into the equation, we have

dh"/dt = -dV/dt/A

dh"/dt = -0.1 m³/min/0.42 m²

dh"/dt = -0.238 m/min

This is the rate at which the depth is decreasing

Since the height h' = 10 - h"

dh'/dt = d(10 - h")/dt

= -dh"/dt

= -(-0.238 m/min)

= 0.238 m/min

So the water level is increasing at a rate of 0.238 m/min

Answer:

Car A was going at 80 m/s

Explanation:

Let's call "x" the unknown speed of car A. In such case, the speed of car B would be x/2.

We proceed to describe the distance covered by car A (dA) in the 5 seconds it took to collide:  dA = speed * time = x * 5 = 5 x

Now the distance covered by car B (dB) in the same time would be:

dB = speed * time = (x/2) * 5 = 5 x / 2

Now, we know that the distance that separated both cars was 600 meters, so the addition of what car A covered plus what car B covered must equal 600 m, and in equation form:

dA + dB = 600

5 x + 5 x / 2 = 600

combining like terms:

15 x / 2 = 600

multiplying both sides by 2:

15 x = 1200

divide both sides by 15:

x = 80 m/s

This is the speed of car A.

The correct answer is option D, which specifies that while putting out a fire in stacked and piled materials, use hooks or pike poles to pull the materials apart prior to dousing the area.

Putting out the fire with Class A foam or water until it has fully died down. In physics, a force is a factor that has the potential to change an object's trajectory. In reaction to a force, a mass-containing object can accelerate or modify its velocity by, for instance, moving away from rest. Force can logically be described as pushing or pulling. A force has both magnitude and direction, making it a vector quantity. Using the SI system, it is written as a newton (N). There is material in all things.

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Correct answer:- (d)  use hooks or pike poles to break apart material.

When attacking the fire in stacked and piled materials, use hooks or pike poles to break apart material, then apply water or Class A foam until extinguished.

A mixture of artificial stabilizers, foaming agents, fluorochemicals, and synthetic polymers are used to create alcohol-resistant (AR) foam, which is intended for use with polar solvents. These foams are resistant to being destroyed by polar solvents due to their chemical composition.

The very effective foam known as aqueous film-forming foam (AFFF, or alcohol-resistant AR-AFFF) is used to put out high-hazard liquid fires.

Class A: Consists of common combustibles like rubber, paper, wood, and plastic. Pressurized water, foam, or multipurpose dry chemicals are the most often used extinguishing agents.

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Because Newton as Pressure = Thrust/Area, the answer will be 7.5.

The rotating equivalent of Newton's first law is this. When each child's weight exerts an equal amount of torque about the pivot in opposing directions, two kids can balance on a seesaw (clockwise and counter clockwise).

The idea of the seesaw You are probably aware that any two people, regardless of their weights, can balance each other while seated on opposite sides of a seesaw. All that is required is for each individual to contribute an equal moment, which is determined by multiplying the person's weight by the distance from the fulcrum.

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Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

mass = Density × volume

From the question we have

mass = 74 × 7

We have the final answer as

Hope this helps you

KCl ( potassium chloride ) is classified as solid substance while O₂  ( oxygen molecule ) is classified as gaseous substance.

KCl is an abbreviation for potassium chloride. Potassium chloride ( KCl ) naturally occurs as a white or colorless solid that has a powdery, crystalline appearance.

Potassium chloride ( KCl ) is one of the important raw materials required in the manufacture of potassium metal.

The metal halide salt KCl is also used in the manufacture of soaps.

The chemical formula of potassium chloride ( KCl ), consists of one potassium ( K ) atom and one chlorine ( Cl ) atom.

O₂ is a substance that is known as oxygen molecule and it usually exist in gaseous state.

Thus, we can conclude that we can classify O₂ ( oxygen molecule )which is known as oxygen molecule as gas, and KCl ( potassium chloride ) known as potassium chloride as solid substance.

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Melvina's potential energy is 54,880 Joules.

To calculate Melvina's potential energy, we need to use the formula for gravitational potential energy:

Potential energy = mass × gravitational acceleration × height

Potential energy is a measure of the energy an object possesses due to its position relative to other objects. In this case, Melvina's potential energy is a result of her height above the ground. As she stands on the ledge of the burning building, her potential energy is stored and can be converted into other forms of energy if she were to jump or fall. The potential energy will decrease as she descends, and it will be converted into kinetic energy (energy of motion).

Given that Melvina has a mass of 70 kg and the ledge is 80 m above the ground, we can substitute the values into the formula:

Potential energy = 70 kg × 9.8 m/s² × 80 m

Calculating this, we find:

Potential energy = 54,880 Joules

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Given,

The linear velocity of the pizza dough, v=0.65 m/s

The radius of the pizza dough, r=0.10 m

The mass of the pizza dough, m=0.50 kg

The centripetal force of an object is given by the equation,

On substituting the known values in the above equation,

Thus the centripetal force experienced by the pizza dough is 2.11 N