When you push a 1.90-kg book resting on a tabletop, you have to exert a force of 2.10 N to start the book sliding. Once it is sliding, however, you can use a force of only 1.06 N to keep the book moving with constant speed. Part A What is the coefficient of static friction between the book and the tabletop?

Answer: The given statement is False.

Top down processing is based on the information that is already present in the mind. It occurs when an individual works from general concepts ( that are imprinted in the brain) to specific.

This means that impressions that are already present in the brain influences the information that is gathered with the help of five senses. Thus, top down processing is not used when an individual encounters an unfamiliar stimulus.

Final answer:

The minimum rotational frequency needed for the amusement park ride to be safe is between 0.165 and 0.215 revolutions per minute. This is calculated based on the coefficient of static friction between the riders' clothing and the wall, and the radius of the cylinder.

Explanation:

In order for the riders to not slide down the wall of the amusement park ride, the centripetal force must be greater than or equal to the force of static friction between the riders' clothing and the wall. The centripetal force is given by the formula:

Fc = (mv^2) / r

where m is the mass of the rider, v is the linear speed, and r is the radius of the cylinder. The force of static friction is given by:

fs = μsN

where μs is the coefficient of static friction and N is the normal force.

At the minimum rotational frequency, the riders will experience the maximum static friction force:

fs(max) = μsN

Substituting the values and equations, we get:

(mv^2) / r = μsN

Since the normal force N is equal to the weight of the riders, we have:

(mv^2) / r = μs(mg)

Canceling out the mass on both sides and solving for v, we get:

v = √(μsgr)

The minimum rotational frequency is the linear speed v divided by the circumference of the cylinder:

f(min) = v / (2πr)

Substituting the value of v, we have:

f(min) = √(μsg / (2π))

Using the given range for the coefficient of static friction, the minimum rotational frequency is between 0.165 and 0.215 revolutions per minute.

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.

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]

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: 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.

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.

The magnitude of net force exerted on the frog is of 1.5 N.

Given data:

The mass of frog is, m = 0.50 kg.

The magnitude of acceleration of frog is, [tex]a = 3.0 \;\rm m/s^{2}[/tex].

As per the concept of Newton's Second law, the force applied on any object is equal to the product of mass and acceleration of an object. Then the expression is given as,

[tex]F=m \times a[/tex]

Solving as,

[tex]F = 0.50 \times 3.0\\\\F=1.5 \;\rm N[/tex]

Thus, we can conclude that the magnitude of net force exerted on the frog is of 1.5 N.

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Answer:

Time taken, t = 30 seconds

Explanation:

It is given that,

Initial speed of the rocket, u = 0

It is lifted with a constant acceleration of, [tex]a=2\times 10^1\ m/s^2=20\ m/s^2[/tex]

Height to be attained, [tex]d=9\times 10^3\ m[/tex]

Let t is the time taken by the rocket to reach an altitude of [tex]9\times 10^3\ m[/tex]. Using the second equation of kinematics to find it as :

[tex]d=ut+\dfrac{1}{2}at^2[/tex]

[tex]d=\dfrac{1}{2}at^2[/tex]

[tex]t=\sqrt{\dfrac{2d}{a}}[/tex]

[tex]t=\sqrt{\dfrac{2\times 9\times 10^3}{20}}[/tex]

t = 30 seconds

So, the time taken by the rocket to reach given height is 30 seconds. Hence, this is the required solution.

The living beings in an ecosystem are named biotic factors. Living beings involve plants, creatures, bacteria, parasites and many more. The non-living components of an ecosystem are named abiotic factors. In an ecosystem, few abiotic factors are sunshine, temperature, climatic gases, water, and clay.

Plants are not an example of an abiotic factor.

Further Explanation:

Many factors affect the environment such as some factors determines how much the tree can grow, why birds are migrating one place to another, and where the plants and animals are found. There are mainly two types of factors that influence the environment are

Abiotic factors are referred as a non-living part of an environment that can easily influence living organisms. These factors are very crucial for living organisms. Every plant and animal requires these factors to live. Without these factors organism can become dehydrated, and week. Examples of Abiotic factors are:

Biotic factors are referred to as all the living parts of an ecosystem. For example, animals and plants are biotic factors. These living things of the ecosystem interact with each other in different ways. Thus, plants are part of biotic factors and not part of abiotic factor.

Learn more:

Answer Details:

Grade: High School  

Subject: Biology

Chapter: Ecology

Keywords:

Biotic, abiotic, sun, light, water, oxygen, plant, animal, non-living, living, ecosystem, organism, tree, grow, bird, migration.

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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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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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.

Answer:

Nonrenewable:Coal, Silver, soil and diamonds  

Renewable- Water  

Explanation:

i hope this helps you to answer your question

Helium has an atomic mass of 4.00 atomic mass units.

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.