Which voice can produce a pitch that has a speed of 343 m/s and a wavelength of 0.68m?

Final answer:

The efficiency of the heat engine is calculated as the work output (40 J) divided by the heat input (150 J), resulting in an efficiency of 26.67%.

Explanation:

The efficiency of a heat engine is calculated using the ratio of the work output to the heat input. In this case, the engine does 40 J of work and the heat input is 150 J. The formula to find efficiency (η) is:

η = Work output / Heat input

η = 40 J / 150 J = 0.2667

So, the efficiency is 0.2667, or 26.67% when expressed as a percentage.

Answer:

9j-

Explanation:

The copper atoms are held together by a metallic bonding. The correct answer would be an option (A).

Among two or more metal atoms, metallic bonding is a form of chemical bonding that results from the attraction of the positively charged metal nuclei and their delocalized valence electrons. However, the contact involved has a distinct nature and is known as metallic bonding in compounds that exclusively include metal atoms.

Metallic bonding, as its name suggests, typically takes place in metals like copper. The copper atoms in a piece of copper metal are arranged in a certain way. These atoms are held together by their valence electrons, which are free to move throughout the metal and are drawn to the positive cores of copper.

Thus, the copper atoms are held together by a metallic bonding.

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The question seems incomplete, the missing options, as follows:

The copper atoms are held together by ____.

A. Metallic bonding

B. Ionic bonding

C. Covalent bonding

The bullet and gun have equal momenta in opposite directions, so the system's momentum is conserved.

According to the principle of conservation of linear momentum, the sum of the initial momenta must be equal to the sum of the final momenta.

The principle of conservation of momentum is written as;

[tex]m_1u_1 + m_2u_2 = m_1v_1 + m_2v_2[/tex]

where;

Thus, we can conclude that the bullet and gun have equal momenta in opposite directions, so the system's momentum is conserved.

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Final answer:

Damage to the nervous system, especially the spinal cord, interrupts communication between the brain and body, leading to paralysis. The inability of spinal nerves to regenerate makes spinal cord injuries particularly severe and difficult to treat. With around 10,000 cases annually in the U.S., seeking effective treatments remains a challenge.

Explanation:

Why does the damage in the nervous system cause paralysis of the body? Damage to the nervous system, particularly the spinal cord, can result in paralysis due to the interruption in the communication between the brain and other parts of the body. The spinal cord acts as an information superhighway, and when it is damaged, this can prevent the brain from sending and receiving messages to the body, leading to a loss of sensation and movement below the injury level.

Spinal cord injuries are particularly severe because most nerve tissues, including those in the spinal cord, are not capable of regeneration, leaving many people permanently paralyzed. In the United States alone, there are around 10,000 spinal cord injuries each year. The extent of paralysis depends on the injury's location along the spinal cord and whether the injury was complete.

For example, damage at the neck level can result in paralysis from the neck down, affecting all four limbs (quadriplegia), while damage lower down may cause paralysis of the legs (paraplegia). Despite ongoing research, including stem cell transplants and efforts to reduce post-injury inflammation, treating spinal cord injuries remains a significant challenge due to the inability of spinal nerves to regenerate effectively.

Answer:

∝=0,4[tex]s^{-2}[/tex] (angular acceleration)

Explanation:

We give you the equation of the sum of all torques:

∑τ=I*∝

Then we replace the torques :

Final answer:

Weather changes occur primarily due to heat exchange between the ocean and atmosphere, heat exchange between the sun and atmosphere, and incoming solar radiation.

Explanation:

Weather changes occur primarily because of heat exchange between the ocean and atmosphere, heat exchange between the sun and atmosphere, and incoming solar radiation.

Oceans have a significant effect on weather and climate because their high heat capacity acts as a temperature buffer. The ocean absorbs most of the radiant heat from the sun, and ocean currents help distribute this heat.

Additionally, weather changes are influenced by variations in solar energy reaching Earth and changes in the reflectivity of Earth's atmosphere and surface.

Final answer:

Weather changes occur primarily because of incoming solar radiation, which heats the Earth's surface and drives atmospheric circulation. Ocean currents also contribute by redistributing heat, while human-induced climate change affects long-term patterns.

Explanation:

Weather changes occur primarily because of incoming solar radiation, which is the most important factor influencing climate. This solar energy heats the Earth's surface, resulting in the temperature of the air above it. The uneven heating of different parts of Earth's surface leads to the formation of pressure gradients and associated wind patterns. Moreover, such heating drives evaporation and affects cloud development and precipitation.

Ocean currents also play a key role by redistributing heat from warmer to cooler areas due to the high heat capacity of water, moderating climates particularly near coastal regions. Additionally, the rotation of Earth and seasonal changes affect the sunlight distribution, further influencing weather patterns.

However, human activities, specifically the burning of fossil fuels, have an impact on the climate, intensifying the greenhouse effect and leading to climate change. These changes result in alterations to the Earth’s overall temperature, oceanic conditions, and the biogeochemical cycles, contributing to more extreme and unpredictable weather events. But for the daily weather changes, solar radiation and the redistribution of this energy by the atmosphere and oceans are the primary drivers.

THE ANSWER IS C- 0.156 N/CM2

Final answer:

The correct answer is 0.156 N/cm², which is calculated by applying the pressure formula P = F/A, with the weight of the water serving as the force and the area being the circle's area at the jug's bottom.

Explanation:

The question asks us to compute the pressure on the bottom of a jug filled with water. To solve this, we can use the formula P = F/A, where P is the pressure, F is the force (which is the weight of the water in this case), and A is the area over which the force is distributed. The force can be calculated by multiplying the mass of water by the acceleration due to gravity, F = mg. The area is the area of the circle at the bottom of the jug, A = πr², where r is the radius of the jug bottom.

Let's calculate it step by step:

The correct answer is 0.156 N/cm².

Answer:

simple answer is D.

Explanation:

Answer: false

Explanation:

Agility is the ability of a body to change position efficiently.

An example is a dancer who moves the body quickly while dancing.

It is also a combination of balance, coordination, speed, reflexes, strength and endurance.

Final answer:

The work associated with compressing a gas from 5.64 L to 3.35 L at a constant pressure of 1.21 atm is 279.58 joules.

Explanation:

To calculate the quantity of work associated with the compression of a gas from 5.64 L to 3.35 L by a constant pressure of 1.21 atm, we use the formula for work done during a constant pressure process: W = -P ΔV, where W is the work, P is the pressure, and ΔV is the change in volume. First, we convert the pressure from atmospheres to pascals because the standard unit for work is joules, which requires pressure to be in pascals (1 atm = 101325 Pa).

Then we find the change in volume: ΔV = Vfinal - Vinitial = 3.35 L - 5.64 L = -2.29 L. We convert this volume from liters to cubic meters by using the conversion 1 L = 0.001 m3, so ΔV in cubic meters is -0.00229 m3. Finally, we calculate the work done: W = -(1.21 atm * 101325 Pa/atm) * (-0.00229 m3) = 279.58 J. Therefore, the work associated with the compression of the gas is 279.58 joules.

Answer:

Explanation:

As per the law of Mass of Action, Rate of forward reaction is equal to the rate of reverse reaction.

In such condition,a system is stable and attains a phase known as dynamic equilibrium.

Consider an equation having some reactants and product to be on a balanced load or sea saw.

If stress is applied, the balance will be distributed and the sea-saw will bend towards the stress factor applied side.

The stress can be applied in different way :

By changing concentration

By changing temperature

By altering pressure or volume

The unit used to measure resistance is ohms (Ω). (option d)

The relationship between voltage, current, and resistance is defined by Ohm's Law, which states that the current (I) flowing through a conductor is directly proportional to the voltage (V) applied across it and inversely proportional to the resistance (R) of the conductor. The formula for Ohm's Law is expressed as V = I × R.

Measuring resistance is crucial in various practical applications. For instance, when designing electronic circuits, engineers need to determine the resistance of different components to ensure proper functioning and avoid damage due to excessive current. To measure resistance, a device called a multimeter is commonly used. It can provide accurate readings of resistance in ohms and help diagnose issues in circuits or components.

It represents the degree to which a material or component hinders the flow of electric current and is vital for understanding and designing electrical circuits.

Main Answer: d. ohms

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Answer:

what are the choices

Explanation:

Explanation:

The velocity of an object is given by the rate of change of position as :

[tex]v=\dfrac{dx}{dt}[/tex]

where

[tex]\dfrac{dx}{dt}[/tex] is the rate of change of velocity

From the position time graph of an object, the velocity of an object can be calculated using the slope of the graph. From the attached figure it is clear that the velocity is given by :

[tex]m=\dfrac{x_2-x_1}{t_2-t_1}[/tex]

[tex]m=\dfrac{20-10}{2-1}[/tex]

m = 10

i.e.

Velocity, v = 10 m/s

Hence, to calculate the velocity of an object the slope of the position vs time graph should be calculated

To find the distance the car will roll along the slope before coming to rest, we can use the kinematic equation. Substituting the given values for initial velocity, acceleration due to gravity, and angle of the slope, we can calculate the distance traveled.

To find the distance the car will roll along the slope before coming to rest, we can use the kinematic equation:

v² = u² + 2as

where v is the final velocity (0 m/s in this case), u is the initial velocity (6.5 m/s), a is the acceleration (-g*sinθ,-g*sin9°), and s is the distance traveled. Rearranging the equation, we get:

s = (v² - u²) / (2a)

Substituting the values, we can calculate the distance traveled along the slope using the given acceleration due to gravity and the angle of the slope.

Final answer:

To determine the distance the car will roll along the slope before being at rest and rolling back, we can use kinematic equations. The car will roll approximately 15.5 meters before being instantaneously at rest and starting to roll back.

Explanation:

To determine how far the car will roll along the slope before coming to rest and rolling back, we can use kinematic equations. The key here is to find the time it takes for the car to reach zero velocity, which will then allow us to calculate the distance traveled.

First, let's find the acceleration of the car along the slope. The component of gravity parallel to the slope is 9.81 m/s2 * sin(9°), which gives us an acceleration of 1.6 m/s2.

Using the kinematic equation, v2 = u2 + 2as, where v is the final velocity (which is zero), u is the initial velocity (6.5 m/s), a is the acceleration (-1.6 m/s2), and s is the distance along the slope, we can solve for s. Rearranging the equation, we get s = (v2 - u2) / (2a). Plugging in the values, we find that the car will roll approximately 15.5 meters along the slope before being instantaneously at rest and starting to roll back.

The magnitude of the total momentum is [tex]\fbox{4.24 kg m/s}[/tex] and the direction is [tex]\bf{south-east}[/tex].

Further Explanation:

The net momentum acting is the sum of all the momentum which is applying on the different bodies considering the direction of action of the momentum. In other words, the net momentum applying on a body is the sum of all the vectors of all the momentum.

The momentum is the vector quantity has some magnitude and unique direction represented in the coordinates system on the x, y and z-axis. It is the related directly to the object mass and object velocity.

Velocity is the vector quantity has some magnitude and some direction represented in the coordinates system on the x, y and z-axis.

Given:

The speed of the two arrows is [tex]30.0 m/s[/tex].

The mass of each arrow is [tex]0.1 kg[/tex].

The first arrow is fired due east and other arrow is fired due south.

Concept:

The expression for the momentum is:

[tex]P=m\vec v[/tex]

Here, [tex]p[/tex] is the momentum, [tex]m[/tex] is the mass of the object and [tex]v[/tex] is the velocity of the object.

The velocity can be represented in the vector form.

The first arrow is fired due east can be written as [tex]30.0{\text{ m/s }}\hat i[/tex] and other arrow is fired due south can be written as [tex]- 30.0{\text{ m/s }}\hat j[/tex].

The total momentum can be expressed as:

[tex]\vec P={m_1}{\vec v_1} + {m_2}{\vec v_2}[/tex]

Here, [tex]\vec P[/tex] is the total momentum, [tex]{\vec v_1}[/tex] and [tex]{\vec v_2}[/tex] are the velocities of the arrows and [tex]{m_1}[/tex], [tex]{m_2}[/tex] are the masses of the arrow.

Substitute [tex]30.0{\text{ m/s }}\hat i[/tex] for [tex]{\vec v_1}[/tex],  [tex]- 30.0{\text{ m/s }}\hat j[/tex] for [tex]{\vec v_2}[/tex], [tex]0.1 kg[/tex] for [tex]{m_1}[/tex] and [tex]0.1 kg[/tex] for [tex]{m_2}[/tex] in the above equation.

[tex]\begin{aligned}\vec P&=\left( {0.1{\text{ kg}}} \right)\left[ {\left( {30.0{\text{ m/s }}\hat i} \right) + \left( { - 30.0{\text{ m/s }}\hat j} \right)} \right]\\&=\left( {0.1{\text{kg}}}\right)\left[ {30.0{\text{ m/s }}\hat i - 30.0{\text{ m/s }}\hat j} \right] \\&=\left( {3\hat i - 3\hat j} \right){\text{ kg}} \cdot {\text{m/s }} \\\end{aligned}[/tex]

Simplify further for the magnitude of the vector.

[tex]\begin{aligned}\left| P \right|&=\sqrt {{3^2} + {3^2}}\\&=\sqrt {9 + 9}\\&=\sqrt {18}\\&=4.24{\text{ kg}}\cdot {\text{m/s}}\\\end{aligned}[/tex]

The direction of the vector can be written as:

[tex]\begin{aligned}\theta&={\tan ^{ - 1}}\left( {\frac{{ - 3}}{3}} \right)\\&={\tan ^{ - 1}}\left( { - 1} \right)\\&=- 45^\circ\\\end{aligned}[/tex]

Therefore, the magnitude of the total momentum is [tex]\fbox{4.24 kg m/s}[/tex] and the negative sign show the direction is [tex]\bf{south-east}[/tex].

Learn more:

1. State and prove law of conservation of linear momentum https://brainly.in/question/3078233

2. Momentum with numerical. https://brainly.in/question/4130937

3. Impulse momentum. https://brainly.com/question/11604162

Answer Details:

Grade: Middle school

Subject: Physics

Chapter: Kinematics

Keywords:

Two, arrow, fired, horizontally, same, speed, 30.0 m/s,  ,  , mass, 0.100 kg. One, due, east, south, magnitude, direction, total, momentum, two-arrow system, specify, respect, 4.24 kg m/s, [tex]4.24{\text{ }}\dfrac{{{\text{kg}} \cdot {\text{m}}}}{{\text{s}}}[/tex], south-east.

Answer:

6

Explanation:

The guy above is correct

C. An object at rest stays at rest as long as unbalanced forces act on it.

Newton's first law establishes the following:

An object will remain at rest or with uniform rectilinear motion unless an external force acts on it.

Therefore, we have that a case contrary to Newton's first law is:

Unbalanced forces acting on an object at rest, cause the object to remain at rest.

It is false, because if the forces are unbalanced, then the object will not remain at rest because external forces act on the object.

Answer:

A situation that is contrary to Newton's first law of motion is:

An object at rest stays at rest as long as unbalanced forces act on it.

Answer

D) burning a candle

Explanation

When burning a candle no new substance is form.

We have both physical and chemical change occuring.

Physical part: Melting of the solid wax and evaporation of the liquid forms the physical change.

Chemical part: burning of the wax vapour forms the chemical change.