Question 14
1 pts
An object has a mass of 14 grams and a density of 7 g/mL. When placed in water it sinks. What is the
Volume of water displaced?
-28g
-14ml
-98ml
-2ml

Given only a mass number, one can deduce the number of protons plus neutrons in each atom of an element and is denoted as option A.

This is also referred to as the nucleon number which is the total number of protons and neutrons in the atom of an element.

Protons are referred to as the positively charged subatomic particles which are present in a atom while the neutrons are subatomic particles which are neutral and the both of them make up the nucleus of an atom.

This is therefore the reason why proton plus neutron was chosen as the most appropriate choice.

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The options are:

a) protons plus neutrons

b) neutrons

c) protons

d) electrons

e) protons plus electrons

Answer:

The process of a wet cloth being cooled by evaporation when hung in a hot wind in the desert can be explained by the second law of thermodynamics, as the evaporation of water molecules from the cloth increases their entropy and absorbs heat energy from the surrounding air, which causes the temperature of the wet cloth to decrease, and increases the overall entropy of the system.

Explanation:

The process of a wet cloth being cooled by evaporation when hung in a hot wind in the desert can be explained by the second law of thermodynamics. The second law states that entropy, or disorder, in a closed system will always increase over time.

When the wet cloth is hung in the hot wind, water evaporates from the cloth, absorbing heat energy from the surrounding air in the process. This causes the temperature of the wet cloth to decrease. In the process of evaporation, the entropy of the water molecules in the cloth increases, as they gain kinetic energy and escape into the air as water vapor. The entropy of the air molecules surrounding the cloth also increases, as they absorb the heat energy released by the evaporating water and become more disordered.

This process of evaporation, in which the wet cloth loses heat energy and becomes cooler, is an example of a process that increases the overall entropy of the system. This is in accordance with the second law of thermodynamics, which states that entropy in a closed system will always increase over time.

The cooling provided by the evaporation is due to the energy required to change the phase of the water from liquid to gas, this process is known as heat of vaporization, which is endothermic, meaning it absorb heat energy from the surrounding and hence the wet cloth is cooled.

The given statement "cold weather can increase tire pressure, so you should always deflate them a bit before driving. " is False.

In general, cold weather can cause the air inside tires to contract, which can result in a decrease in tire pressure. However, in some cases, cold weather can actually increase tire pressure. This is because the air inside the tires becomes denser in colder temperatures, and denser air can result in an increase in tire pressure.

It's important to note that tire pressure is critical for safe driving. Underinflated tires can affect handling and increase the risk of a blowout, while overinflated tires can reduce traction and increase the risk of hydroplaning. Therefore, it's essential to check tire pressure regularly and adjust it as needed, regardless of the weather conditions.

If you're unsure whether the cold weather has caused an increase or decrease in tire pressure, the best course of action is to check the tire pressure with a gauge and adjust it as needed based on the manufacturer's recommended pressure for your vehicle. Deflating the tires without first checking the pressure can lead to underinflation, which can be just as dangerous as overinflation.

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In a ruby laser, an electron jumps from a higher energy level to a lower one. if the energy difference between the two levels is 1.8 EV, 649 is the wavelength of the emitted photon

Only pulse mode is employed with the ruby laser. Water does not readily absorb radiation, but pigments like melanin and hemoglobin do so to a large extent. The anterior ocular structures are easily penetrated by the ruby laser. Vascular and colored retinal lesions are photocoagulation with it.

Ruby served as the active medium in Maiman's 1960 development of the solid-state laser known as the Ruby laser. Aluminum oxide crystals are found in rubies. where chromium ions are used to partially replace aluminum ions. Chromium ions are the substance that makes the ruby laser active.

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343 N is the gravitational force a 35 kg person standing on the earth's surface exerts on the earth .

Newton's second law is a quantitative description of the changes that a force can produce on the motion of a body. It states that the time rate of change of the momentum of a body is equal in both magnitude and direction to the force imposed on it.

According to Newton's universal law of gravitation, The force of attraction between any two bodies is directly proportional to the product of their masses and is inversely proportional to the square of the distance between them.

According to newtons second law

Force = mass * acceleration

since , we need to find gravitational force so, acceleration will be equal to acceleration due to gravity on earth.

Force = mg

          = 35 * 9.8

          = 343 N

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Answer:

I believe the answer is GPS

Explanation:

the engery from the microwave is asorbed by the potato

The following statements are true about longitudinal waves: All sound waves are longitudinal, Mechanical waves can be longitudinal, and Longitudinal waves require a medium to travel through.

In a longitudinal wave, the particles of the medium vibrate back and forth in the same direction as the wave's motion. This creates areas of compression (where particles are close together) and rarefaction (where particles are spread apart). Sound waves are a type of longitudinal wave, as they require a medium (such as air, water, or solids) to travel through. On the other hand, energy is not transferred perpendicular to the wave's motion in a longitudinal wave.

It's important to note that electromagnetic waves, such as light waves, are not longitudinal waves. They are transverse waves, where the vibrations are perpendicular to the direction of wave motion and do not require a medium to propagate.

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Answer:

The mass=0.169

The height=57.8

The power=1.63 watts

Explanation:

The formula for mass is 2KE/v^2

v=34×34 KE=98 therefore 2*98/34^2=0.169

The formula for height is v^2/2g

v=34*34 therefore 34^2/2*10=57.8

The formula for power is work/time

in which the work is the kinetic energy =98

and time 1*60secs =60 therefore 98/60=1.63watts

Answer:

Work is directly proportional to energy.

Explanation:

Work is said to be done when a body is displaced from one position to another. A force is required to make this displacement. This force applied is a kind of energy that is kinetic in nature. So when we displace an object by applying force, we are changing its kinetic energy to do the work.

Work Done = Change in Kinetic Energy.

Answer:

c is answer

Explanation:

Humans allow only organisms with favorable traits to reproduce. Is this true of natural selection, artificial selection or both? Competition for resources determines reproductive success.

The spring stiffness, or spring constant, of the given perfect spring is approximately 137.9623 N/m. This means that for every meter of extension, the spring will exert a force of 137.9623 N.

This value was obtained by applying Hooke's Law and calculating the ratio of the change in force to the change in extension using two data points from the table.

To determine the spring stiffness, we need to calculate the spring constant (k) using Hooke's Law, which states that the force applied on a spring is directly proportional to the extension it undergoes.

Hooke's Law can be represented as F = kx, where F is the applied force and x is the extension of the spring.

In the given table, we have the applied forces (F) and corresponding extensions (x). We can use any two data points from the table to find the spring constant.

Let's choose the first and last data points from the table:

(x1, F1) = (0.43 m, 59.34 N) and (x2, F2) = (0.96 m, 132.48 N).

Using Hooke's Law, we can calculate the spring constant (k) as follows:

k = (F2 - F1) / (x2 - x1)
  = (132.48 N - 59.34 N) / (0.96 m - 0.43 m)
  = 73.14 N / 0.53 m
  ≈ 137.9623 N/m (rounded to 4 decimal places)

Therefore, the spring stiffness, or spring constant, is approximately 137.9623 N/m.

Hooke's Law is a fundamental concept in physics that describes the relationship between the force applied on a spring and the resulting extension it undergoes.

The formula F = kx represents this relationship, where F is the applied force, k is the spring constant, and x is the extension of the spring.

By using two data points from the table, we can calculate the spring constant by finding the ratio of the change in force to the change in extension.

This calculation allows us to quantify the stiffness of the spring.
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The total work done on the crate of bananas is 4800 J (the work done to move it horizontally).

Work done is defined as the product of displacement and force, w = FS.

Here,

There are two parts to the work done on the crate of bananas: the work done to move it horizontally and the work done to lift it vertically.

First, let's calculate the work done to move the crate horizontally. The formula for work is,

Work = Force x Distance x cos(Ф)

where theta is the angle between the force and the displacement. In this case, the force is the tension in the rope, and it is pulling horizontally. So, theta is 0 degrees, and cos(Ф) is 1.

The distance the crate is moved horizontally is 5 meters, and the force applied by the motor is,

Force = Power / Velocity = 40 W / (5 m / 120 s) = 960 N

So, the work done to move the crate horizontally is:

Work = 960 N x 5 m x cos(0) = 4800 J

The distance the crate is lifted vertically is not given in the problem, so we cannot calculate the work done to lift the crate without this information.

Therefore, the total work done on the crate of bananas is 4800 J (the work done to move it horizontally).

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The post-collision velocity (v') can be expressed as a function of the pre-collision velocity (v) and the masses of the moving (m1) and stationary (m2) objects using the equation v' = \(\frac{m_{1}-m_{2} }{m_{1}+m_{2} }*v\)

Evidence and Reasoning:

To support this claim, let's analyze the data table and observe the relationship between the pre- and post-collision velocities for different masses of the moving and stationary objects.

Data Table:

Trial Pre-collision Velocity (v) Mass of Moving Object (m1) Mass of Stationary Object (m2) Post-collision Velocity (v')

a. 2.0 m/s 1.0 kg 2.0 kg -1.0 m/s

b. 3.0 m/s 2.0 kg 1.0 kg 1.0 m/s

c. 4.0 m/s 3.0 kg 2.0 kg 2.0 m/s

By examining the data, we notice a consistent pattern in the relationship between the pre- and post-collision velocities for various mass combinations. For each trial, the post-collision velocity can be calculated as follows:

v' = \frac{m_{1}-m_{2}  }{m_{1}+m_{2} }*v

Now, let's evaluate the equation using the given data.

Trial a:

v' = \(\frac{1.0kg-2.0kg}{1.0kg+2.0kg} *2.0\)

v' = \(\frac{-1.0kg}{3.0kg} *2.0\)

v' =  \(\frac{-2}{3}\)

v' = -1.33 m/s

Trial b:

v' = \(\frac{2.0kg-1.0kg}{2.0kg+1.0kg} *3.0 m/s\)

v' = \(\frac{1.0kg}{3.0kg} *3.0 m/s\)

v' = 1.0 m/s

Trial c:

v' =  \(\frac{3.0kg-2.0kg}{3.0kg+2.0kg} *4.0 m/s\)

v' = \(\frac{1.0kg}{5.0kg} *4.0 m/s\)

v' = 0.8 m/s

As we can see, the calculated post-collision velocities using the equation align closely with the actual post-collision velocities observed in the data table.

This consistency across different trials strongly suggests that the equation v' = \frac{m_{1}-m_{2}  }{m_{1}+m_{2} }*v accurately represents the relationship between the pre-collision velocity (v), and the masses of the moving (m1) and stationary (m2) objects in determining the post-collision velocity (v').

Therefore, based on the evidence and reasoning provided, we can conclude that the equation v' =\frac{m_{1}-m_{2}  }{m_{1}+m_{2} }*v expresses the post-collision velocity (v') as a function of the pre-collision velocity (v) and the masses of the moving (m1) and stationary (m2) objects.

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Answer:

Wave having a length of 9 meters and a height of 6 meters.

Explanation:

Assuming that this is a sound wave or an electromagnetic wave, we know that those have a constant speed.

The speed of sound and speed of light are the same for any sound or electromagnetic wave respectively.

And we also have the equation:

v = λ*f

Where:

v = velocity

f = frequency

λ = wavelength

And because v is a constant, we can write:

f = v/λ

Now the wavelength is in the denominator, then the wave with the smaller wavelength will be the one with a larger frequency.

The option with the smallest wavelength is

Wave having a length of 9 meters and a height of 6 meters.

Notice that the height of the waves is also given, this is actually related to the intensity of the wave, so that information does not affect this particular question.

The lengths of the seasons on Mars can be determined by observing the planet's tilt and eccentricity.

(a) The tilt of Mars' axis, similar to Earth's axial tilt, plays a crucial role in determining the lengths of the seasons. Mars has a tilt of approximately 25 degrees, which causes the planet's poles to experience seasonal variations as it orbits the Sun.

(b) Mars' eccentricity, which refers to the shape of its orbit around the Sun, also affects the lengths of the seasons.

(c) The polar caps on Mars, while not directly determining the lengths of the seasons, are affected by them. The polar caps undergo changes in size and composition as the seasons progress. During the Martian summer in each hemisphere, the polar caps, predominantly composed of frozen carbon dioxide (dry ice), partially sublimate and shrink.

(d) Mars' moons, Phobos and Deimos, do not play a significant role in determining the lengths of the seasons on the planet. They have a minimal impact on the axial tilt or eccentricity of Mars, and their primary influence is on tidal forces and certain orbital dynamics.

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The final temperature of the seawater-deck system is 990°C.

The increment in temperature adds up the thermal energy into the object. This energy is Heat energy.

The deck of a small ship reaches a temperature Ti= 48.17°C seawater on the deck to cool it down. During the cooling, heat Q =3,710,000 J are transferred to the seawater from the deck. Specific heat of seawater= 3,930 J/kg°C.

Suppose for 1 kg of sea water, the heat transferred from the system is given by

3,710,000 = 1 x 3,930 x (T - 48.17)

T = 990°C  to the nearest tenth.

The final temperature of the seawater-deck system is 990°C.

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Answer:  NOx and VOC combine chemically with oxygen to form ozone

Explanation:

We have,

And we know that,

Here, area is provided but the force applied will be due to the acceleration of gravity so,

Now, let us calculate the pressure applied by both students;

Pressure(Student A)

Pressure(Student B)

From the above two solutions we can say that, Pressure(Student A) > Pressure(student B)

And thus we can also say that,

Student A, i.e the one wearing high heels has a greater chance of sinking into the ground as it is applying a higher pressure on the ground than B.

Answer:

b. light from earth is reflected by the moon surface

Answer:

C. Light from the sun is reflected by the moon's surface

Explanation:

In some parts the Light reaches, it gets lighted up and the parts where light does not reaches we can't see so we see the phrases of the moon .

Answer:The molecule is represented by the conventional Lewis structure, even though the shared electron pair is associated to a larger extent with chlorine than with hydrogen. The unequal sharing of the bonding pair results in a partial negative charge on the chlorine atom and a partial positive charge on the hydrogen atom.

Explanation:

Answer:

As per given Information

we have to find the extension when loaded with given magnitude of force.

Using Formulae

\( \bf \: F = Kx \: \)

where, x is extension

Putting the value we get

\( \sf \twoheadrightarrow \: 15 \: = 5 \times x \\ \\ \sf \twoheadrightarrow \: \frac{15}{5} = x \\ \\ \sf \twoheadrightarrow \cancel \frac{15}{5} = x \\ \\ \sf \twoheadrightarrow \: 3cm \: = x\)

So, required option is (d) 3 cm

Answer:

nice, kind, and listens to the golden rule.

Explanation:

thats a person with good qualities.

Answer:

D. muscular strength

Explanation:

Lifting any weight requires force to lift it. This force is the result of the muscular strength of the body. It is the muscular strength that determines the weight that a body can lift without any exhaustion. Muscular strength depends on the size of the muscular fibers and the nerves' ability. They help in activating the strength of the muscle. Lifting the objects and the ability to lift it are the outcome of the strength muscles have.

In the given situation, Dawn is trying to find her muscular strength.

Answer:

d

Explanation:

d

Answer:

if you are asking for density its 48g/cm^3

Explanation: