What do we call any space that has no air?

Final answer:

Newton's third law dictates that as Lucy pushes a box forward, the box pushes back with an equal and opposite force.

Explanation:

According to Newton's third law, whenever Lucy pushes the box across the floor exerting a force on it, the box exerts an equal and opposite force back onto Lucy. This law states that forces occur in equal but-opposite-to pairs -- meaning, if object A exerts a force on object B, object B exerts a force of equal magnitude but in the opposite direction on object A. In Lucy's case, as she pushes the box forward, the box pushes back on her with the same amount of force.

If one of the four engines suddenly fail, so this means that we only get 3 / 4 of the original force. Since force is the product of mass and acceleration and mass is constant, therefore we get 3 / 4 of the original acceleration.

So the remaining acceleration is:

a = (2.0 m/s^2) * (3 / 4)

a = 1.5 m/s^2

Answer: behaviorism

Explanation:

The psychology can be define as the scientific study of the function of the mind and the behavior associated with it. The wide discipline of psychology deals with the study of the human development, health, sports, clinical , cognitive and social behavior.

The major area of study in psychology is the behaviorism. It is a systematic approach which is used to understand the behavior of the human beings. The behavior is the response to various stimuli of the environment. The behavior is associated with the reinforcement and punishment.

The work done on the object during this motion is 765 J.

The given parameters;

The work done on the object is determined by applying work-energy theorem.

W = ΔK.E

W = ΔK.E = ¹/₂m(v² - u²)

W = ¹/₂ x 30(10² - 7²)

W = 765 J

Thus, the work done on the object during this motion is 765 J.

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Helium has an atomic mass of 4.00 atomic mass units.

Rutherford's model revolutionized atomic theory by proposing a nucleated structure. Our current understanding, based on quantum mechanics, offers a more accurate and probabilistic description of the atom's internal structure.

Rutherford's model, proposed in 1911, was a significant departure from the earlier plum pudding model. It postulated a positively charged nucleus at the center of the atom, with negatively charged electrons orbiting around it in a manner similar to planets orbiting the sun.

However, our current understanding of the atom, based on quantum mechanics, is much more complex:

1. Electron Orbitals: Instead of well-defined orbits, electrons are found within orbitals, which are regions of space around the nucleus where the probability of finding an electron is high. These orbitals are defined by quantum numbers and have various shapes (s, p, d, f, etc.).

2. Quantization: Electrons can only occupy certain energy levels, and the energy of an electron in an atom is quantized. This is in contrast to the planetary model, where electrons could theoretically occupy any orbit at any distance from the nucleus.

3. Nuclear Structure: The nucleus itself is composed of protons and neutrons, which are further made up of quarks. Rutherford's model did not delve into the substructure of the nucleus.

4. Electron Spin and the Pauli Exclusion Principle: Electrons have an intrinsic property called spin, and the Pauli Exclusion Principle states that no two electrons in an atom can have the same set of quantum numbers.

Answer: B.

15.6 newtons

Explanation: edmentum

The question is about physics and refers to the ideal gas laws. From the data provided, we know that the volume of the bag at the top of the mountain will change due to a decrease in pressure and temperature. By using the ideal gas laws equations, we can find the final volume of the bag.

The question is inquiring about the change in volume for a bag when the pressure and temperature change from the base of the mountain to the top. Here, we will use the ideal gas laws which state that volume is directly proportional to temperature and inversely proportional to pressure. Given that the initial pressure is 760mmHg and the final pressure is 453mmHg and that the temperature fell from an average room temperature of 25°C (or 298.15 K) to 8°C (or 281.15 K), we can use these principle to solve the question. Note that pressure is given in mmHg and needs to be converted to the same unit.

You can calculate the change in the bag's volume using the relationship between the initial and final state: V1/T1 = V2/T2 where V1 is the initial volume and V2 is the final volume. Considering the pressure changes, you could use another ideal gas law equation that defines the relationship between pressure and volume: P1V1=P2V2, where P1 and P2 are the initial and final pressures respectively.

By applying these formulas, you can calculate the change in volume of the bag. Have in mind that this is an approximation since real gases don't always behave as ideal gases, especially under extreme conditions.

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Answer:

Explanation:

Encyclopedias are written by an academic source, which transform them in a reliable scholarly source.

On the other hand, a magazina article is written and corrected by an editorial which is not academic in most of the cases. Similarly, a newspaper is based in editors about different topic outside the academica environment.

Finally, a TV show is the least trustworthy of the choices, because must of the time, TV shows are made to just entertain to increase their raitings.

Therefore, the right answer is an encyclopedia.

A nanometer is equivalent to 10^-9 meter. While a centimetre is equivalent to 10^-2 meter. Therefore the conversion factors are:

1 nanometer = 10^-9 meter

1 centimeter = 10^-2 meter

So,

0.227 nanometer * (10^-9 meter / 1 nanometer) * (1 centimeter / 10^-2 meter) = 2.27 x 10^-8 centimeter

Answer:

a

Answer:

A. 61 N

Explanation:

In this system, there are three moveable pulleys. In this case, the rope will have to move six times as far as the weight will rise. In other words, the input distance is 6 times the output distance  ( d in =6⋅ d out ) . Because the efficiency is 100%, the work input is equal to the work output, so we have:

work input  = work output

f( in)  ⋅  d( in) =   f( out)  ⋅  d( out)

 f( in)  ⋅ (6 ⋅  d( out))  =  f( out)  ⋅  d( out)

 f( in)  ⋅ 6 =  f( out)

  f( in)  ⋅ 6 = 360 N

  f( in)  = 60 N  

Another way to think of this is that since the rope has to move 6 times as far as the height of the weight, the mechanical advantage will be 6. Therefore, the input force needed is  360 ÷ 6 = 60 N . Of course, 60 N will balance the object, so a force slightly greater than 60 N (like 61 N) will be required to lift it.

Diamond Abrasive and Mineral Polisher are the most useful as grains on sandpaper.

Sandpaper is also known as glasspaper. It is used for a type of coated abrasive consisting of sheets of paper or cloth with abrasive material glued to one face.

Sandpaper is produced in a variety of grit sizes which are used

1. Remove material from surfaces to make them smooth or to remove a layer of material

2. Surface roughening

Diamond abrasives and mineral polishers are some examples of sandpapers used as a grain. Diamond abrasive powder or crushed diamond used as an abrasive is also known as diamond powder. A mineral polisher is a mineral that forms or finishes a workpiece by rubbing it.

Thus, Diamond Abrasive and Mineral Polisher are the most useful as grains on sandpaper.

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Final speeds of both baseballs will be the same when they hit the ground, calculated by the kinematic formula, and the difference in time of flight is twice the time it takes for the upward-thrown ball to reach its highest point and start falling.

When a player throws one baseball vertically upward at speed (vo) and another vertically downward at the same speed, the formula to calculate the final velocity (v) at the point of impact, ignoring air resistance, is given by v = √(v₀^2 + 2gh), where g is the acceleration due to gravity (9.81 m/s²) and h is the height from which the balls were thrown.

The ball thrown downwards will have an initial speed of v₀ downwards; therefore its final speed will be v = v₀ + √(2gh).

The ball thrown upwards will reach a velocity of zero before changing direction and falling back down, thus its final speed will converge on the same value as a ball thrown downwards (ignoring air resistance and the initial upward speed).

The difference in time of flight is due to the time it takes for the upward thrown ball to stop and start falling, which is t = v₀/g.

So, the upward thrown ball will take an additional 2t (up and down) time to hit the ground compared to the downward thrown ball.

Utilizing the kinematic equations for projectile motion can aid in solving for these values.

On a typical seismogram, surface wave will show the highest amplitudes. The correct option is b.

A seismograph produces a graph known as a seismogram. It is a log of the ground motion over time at a measurement station.

Seismograms typically capture motions along three cartesian axes, with the x and y axes parallel to the surface of the Earth and the z axis perpendicular to it.

Earthquake location and magnitude are found via seismograms. It is possible to think of an earthquake's magnitude as changing depending on how much energy is released at the rupture point.

Geologists utilize a seismometer, sometimes known as a seismograph, to measure and capture seismic waves. Surface waves often have the highest amplitudes on a seismogram.

Thus, the correct option is b.

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Final answer:

In deep space, d) a spacecraft given a quick push will keep moving indefinitely until an equal and opposite force stops it, in accordance with Newton's First Law of Motion. This is due to the lack of air resistance and minimal gravitational pull in deep space.

Explanation:

If a spacecraft that seems to be motionless in deep space is given some type of quick push, the correct answer is D: the spacecraft will move and will not stop until it is stopped by an equal and opposite force. This outcome is dictated by Newton's First Law of Motion, often referred to as the law of inertia. According to this law, in the absence of an external force, an object at rest remains at rest, and an object in motion continues in motion with the same speed and in the same direction. Space, particularly deep space, has neither air to cause resistance nor sufficient gravitational pull from nearby masses to significantly alter the craft's course, assuming it's far enough from any massive body.

For example, spacecraft in interplanetary space operate for the most part without continuous thrust. They rely on brief engine fires to make adjustments to their trajectory or speed and then continue on their course due to the lack of resistance. Similarly, an asteroid travelling through space distant from gravitational forces will not slow down unless acted upon by another force.

The wavelength is the distance between two adjacent peaks of the wave.

Hence, option C is correct.

The distance between two identical locations (adjacent crests) in successive cycles is known as the wavelength, and it is used to describe waveform signals that are transmitted over wires or into space. Typically, in wireless systems, this length is specified in meters (m), centimeters (cm), or millimeters (mm). The wavelength is more frequently described in nanometers (nm), which are units of 10-9 m, or angstroms, which are units of 10-10 m, for infrared (IR), visible light (UV), and gamma radiation.

Frequency, which is defined as the number of wave cycles per second, and wavelength have an inverse relationship. The wavelength of a signal decreases with increasing frequency, or we can say that wavelength and refractive index are inversely proportional to each other.

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If you are standing on the floor, motionless, the forces that act on you are:

.The force of gravity acts downward

.The force the floor exerts upward.

What is  force of gravity?

The force of gravity is a force that pulls a body towards the centre of the earth or any other physical body with mass.

Gravity determines how fast objects move towards each other. The average gravitational pull of the Earth is 9.8 meters per second squared (m/s²).

What is the force the floor exerts?

It is the normal reaction in the upward direction.i.e the normal force. The force the floor exerts in repulsion as a result of the weight of the individual standing on it.

Note that, these two forces are of equal magnitude and in opposite directions, so they balance each other. Hence, the person standing is at equilibrium.

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Final answer:

When standing still, you experience the force of gravity pulling you down and the normal force from the floor pushing you up. These forces are equal and opposite, creating a static equilibrium situation, as described by Newton's third law.

Explanation:

When you stand still on the floor, two primary forces act on you: the force of gravity, which pulls you downward, and the normal force exerted by the floor, which pushes you upward. These two forces are indeed equal and opposite when you are motionless, according to Newton's third law of motion. Specifically, this law states that for every action there is an equal and opposite reaction. Therefore, the floor exerts an upward normal force on your feet that is equal in magnitude but opposite in direction to the force of gravity acting downward on you. This situation is an example of static equilibrium, where all the forces on an object cancel each other out, resulting in no net force and no acceleration.

The normal force is a reactive force; it responds to the compression caused by your weight and the gravity force. As long as you remain standing still, with no other external forces acting on you, these forces will remain in balance, keeping you stationary on the floor.

The specific heat of aluminum is actually simply a diversion. Because we can directly compute for the specific heat of copper using the formula:

ΔH = m C ΔT

where ΔH is change in enthalpy or heat lost, m is mass, C is specific heat and ΔT is change in temp

4,600 J = 150 g * C * (100 °C - 20°C)

C = 0.38 J/g°C

Answer:

0.383 J/g°C

Explanation:

The heat emitted by the copper ball while cooling down is given by:

[tex]Q=m C_s \Delta T[/tex]

where:

m = 150 g is the mass of the ball

Cs = ? is the specific heat of copper

[tex]\Delta T=100^{\circ}C-20^{\circ}C=80^{\circ}C[/tex] is the change in temperature

We know that the heat lost by the copper ball is

[tex]Q=4.6 kJ=4600 J[/tex]

So we can re-arrange the formula to find the specific heat capacity:

[tex]C_s = \frac{Q}{m \Delta T}=\frac{4600 J}{(150 g)(80^{\circ} C)}=0.383 J/g^{\circ}C[/tex]

Uniform circular motion refers to the motion of an object moving in a circular path at a constant speed. Despite the constant speed, the object actually experiences constant acceleration due to its constant change in direction, which is coined as Centripetal Acceleration.

Uniform circular motion is a principle in physics that describes the motion of an object traveling in a circular path at a constant speed. Although the speed is steady, the acceleration is not zero. This is because acceleration is not just the rate of change in speed, but also encompasses change in direction. Despite the constant speed in uniform circular motion, the direction of the object is always changing, hence creating acceleration.

Centripetally, the acceleration is directed towards the center of the circle along which the object is moving. The continuous change in direction results in a constant acceleration. This force that keeps the object moving along the circular path is known as the Centripetal Force. Therefore, even with constant speed, the continuous change in direction in a circular path results in constant acceleration, known as the Centripetal Acceleration.

As a concrete example, think about when you're driving and take a turn at a constant speed. You can feel yourself being pulled to the side, an effect of the centripetal acceleration.

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