A 140
B 78
C 186
D 124
Which statement is correct?
Material B is the least dense.
Material C is the most dense.
Material A is denser than Material D.
Material D is denser than Material A.

Proton is the fundamental particle  that is found in every elements.Similarly neutron is also present in every atoms except normal hydrogen atom though it is present  in other isotopes of hydrogen also

The proton and neutron are included in the hadron family which are composed of  quark particles .

There are various types of quark particles with their anti particles also. These are named as UP, DOWN, TOP,BOTTOM,CHARM and STRANGE with their anti particles like ANTI-UP,DOWN etc.

These are held by strong forces just like electromagnetic force and becomes the building block of protons and neutrons.

One proton is made up of two up quarks and one down quark. The charge of one up quark is [tex]= +\frac{2}{3}e[/tex] and charge of one down quark is [tex]-\frac{1}{3} e[/tex]

Hence charge of proton is[tex]2/3+2/3+[-1/3][/tex] e

                                         = +e [tex]i.e 1.6702*10^{-19} coulomb[/tex]

One neutron is made up of one up quark and two down quarks.

Hence charge of neutron is- [tex]2/3+[-1/3]+[-1/3][/tex] e

                                           =0

Answer:

the answer is  A folded mountain. It is formed when an earthquake happened and this was the result of the movement of the plates.

Answer: the rocks of the mountain were once under water

(just took the test)

Basically the mountain was once covered in water and fish lived there, so when there was some sort of drought the fish died leaving their fossils behind

The stratified rocks of the Himalayas are abundant with fossils of extinct marine plants and coral reef remnants, as well as the remains of ancient inhabitants of the Tethys Sea. The truth about the Himalayas' genesis is revealed by the finding of these fossils.

Whale and other marine mammal fossils have been discovered in the Andes, proving that the South American mountain range rose quickly from the sea.

The limestone strata of the highest and youngest mountain ranges in the Himalayan include shells, pebbles, and marine fossils, providing geological proof that the Tethys Sea was the source of the Himalayas' formation.

Therefore, In essence, the mountain was originally submerged in water, where fish once thrived. When there was a drought, the fish perished and left behind fossils.

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Both Transverse and Longitudinal Waves transmit in solids but only Longitudinal waves can transmit in fluids.

Longitudinal waves are defined as mechanical waves that require a medium for propagation while transverse waves are defined as non-mechanical waves that do not require a medium for propagation. Longitudinal waves have compressions and rarefactions, while transverse waves have crests and troughs.

Longitudinal waves can propagate in liquids but transverse waves cannot. Transverse waves propagate in the direction perpendicular to the medium but longitudinal waves propagate in the same direction with the medium. Both can transmit energy in a solid medium.

Thus, both Transverse and Longitudinal Waves transmit in solids but only Longitudinal waves can transmit in fluids.

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Final answer:

Sound is detected by the brain when auditory stimuli (sound waves) cause the eardrum and inner ear structures to vibrate and convert these vibrations into electrical impulses that are interpreted by the brain.

Explanation:

Sound is detected by the brain through a series of processes that begin with auditory stimuli, which are sound waves. These sound waves cause the eardrum to vibrate, and the energy from these vibrations is transferred through the middle ear bones to the cochlea in the inner ear. In the cochlea, the mechanical energy causes the basilar membrane to flex, which then bends the stereocilia on receptor hair cells. This bending activates the receptors, converting the mechanical vibrations into electrical impulses. These impulses are carried to the brain by the auditory nerve, where the brain interprets them as sound.

Final answer:

The work done on the box is found by first calculating the horizontal component of the applied force and then multiplying it by the distance moved. The total work done is 1912.5 Joules.

Explanation:

The question involves calculating the work done on a metal box which is being pulled horizontally by a rope exerting a force at an angle. This is a classic physics problem that involves understanding the components of force and the definition of work in a physical context.

To calculate the work done on the box, we need to find the component of the force that acts in the direction of the box's movement (horizontal direction). The force is given as 255 N at an angle of 60°. The horizontal component (Fhorizontal) of this force is F * cos(θ), which gives 255 N * cos(60°) = 127.5 N. The work done (W) is the product of this horizontal force component and the distance (d) over which it acts. Hence, W = Fhorizontal * d = 127.5 N * 15.0 m = 1912.5 Joules.

Final answer:

The heating of the bakery indicates an exothermic reaction, where heat is released as two liquids react, raising the surrounding temperature.

Explanation:

When Taylor mixed two liquids together in a bakery, and the bakery quickly heated up, this indicates that the reaction that took place was exothermic. In an exothermic reaction, heat is released into the surroundings, which can cause a noticeable rise in temperature. An example of an exothermic reaction is when hydrochloric acid (HCl) is mixed with sodium hydroxide (NaOH). Upon mixing, the two react to form water and salt, and the temperature in the environment can increase, as observed with the temperature change from 22.0 °C to 28.9 °C. This temperature increase happens because the chemical reaction releases energy that was previously held in the chemical bonds of the reactants.

Furthermore, temperature plays a significant role in chemical reactions, as it typically influences the rate at which reactions occur. For instance, an increase in temperature of 10 °C approximately doubles the rate of a reaction in a homogeneous system, according to the temperature coefficient rule. However, in the scenario with the bakery, the focus is on the heat released as a product of the reaction rather than the reaction rate.

Answer:

B) The car at point C has less kinetic energy than the car at point B.

Explanation:

We have two types of energy involved in this situation:

- Gravitational potential energy: this is the energy related to the heigth of the car, and it is given by [tex]U=mgh[/tex], where m is the mass of the car, g is the gravitational acceleration, and h is the heigth of the car. The potential energy is higher when the car is located higher above the ground.

- Kinetic energy: this is the energy due to the motion of the car, and it is given by [tex]K=\frac{1}{2}mv^2[/tex], where m is the mass of the car and v is its speed. The kinetic energy is higher when the speed of the car is higher.

- The law of conservation of energy states that the total mechanical energy of the car (sum of potential energy and kinetic energy: [tex]E=U+K[/tex]) is constant). This implies that when the car is at a higher point, the kinetic energy is less (because U is larger, so K must be smaller), while when the car is at a lower point, the kinetic energy is larger.

- Based on what we have written so far, we can conclude that the correct statement is:

B) The car at point C has less kinetic energy than the car at point B.

Because the car at point C is located at a higher point than point B, so the car at point C has larger potential energy than at point B, which implies that car at point C has less kinetic energy than the car at point B.

Answer: The answer is C

A car at point B has more kinetic energy than the car at point D.

Kinetic energy is energy at work.

Potential energy is stored energy.

Answer:

the other guy is incorrect because animals don't need carbon dioxide for respiration, they breathe in oxygen like us. all of them are incorrect except A.

Answer:

a

Explanation:

Because it is in bae which is breath and exhale

To find the volume of a piece of aluminum with a mass of 8.1 grams and a density of 2.7 g/cm³, calculate the volume by dividing mass by density, giving you a volume of 3 cm³.

The density of aluminum is given as 2.7 g/cm³. If the mass of a piece of aluminum is 8.1 grams, you can calculate its volume using the formula density (p) = mass (m) / volume (V). In this case, you would rearrange the formula to solve for volume, resulting in V = m / p. Plugging in the known values, we get V = 8.1 g / 2.7 g/cm³.

After performing the division, we find the volume of the piece of aluminum is 3 cm³. Thus, the piece of aluminum has a volume of 3 cubic centimeters for its mass of 8.1 grams when the density is 2.7 g/cm³.

The kind of deformation a cube of Jell-O exhibit when it jiggles is Shear deformation.

Shear deformation occurs when an object changes shape because forces are applied to it and does not just become longer or shorter.

As the cube of Jell-O jiggles, its shape changes in the process due to the rapid motion of the jiggles.

Thus, the kind of deformation a cube of Jell-O exhibit when it jiggles is Shear deformation.

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The mass of the friend is 118.75 kg.

When two or more forces are acting on the system of objects, then the to attain equilibrium, net force must be zero.

a) Apply Newton's Second Law for equilibrium of forces

∑F=ma

Where F is the force, m is the mass and a is the acceleration.

Friends sit in a sled in the snow. If you apply a force of 95 N to them, they have an acceleration of 0.8 m/s2.

m = F/a

m =95N/0.8 m/s^2

m =118.75 kg

Thus, the mass of the friend is 118.75 kg.

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Answer:

A

Explanation:

Plants play a crucial role in the water, oxygen, nitrogen, and carbon cycles.  In water Cycle they absorb water through transpiration.

Plants  absorb water from the soil through their roots and release it into the atmosphere through a process called transpiration. This helps to regulate the amount of water in the atmosphere, which is essential for weather patterns and the water cycle.

Oxygen Cycle: Plants are the primary producers of oxygen through the process of photosynthesis.

They absorb nitrogen from the soil through their roots and use it to build proteins and other essential compounds.

carbon cycle :During photosynthesis, plants absorb carbon dioxide from the atmosphere and use it to build organic compounds such as sugars, starches, and cellulose.

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Answer:

The work is given 556 J. Here work is performed horizontally so your distance d=1.3 m

W=F.d

F=W/d =556/1.3 = 427.69 N

Explanation:

Answer:

B) UV waves are higher frequency and carry more energy.

Explanation:

The light that we see around us is called visible light which is just 7% of the complete electromagnetic wave spectrum. This EM spectrum has other waves as well such as gamma, UV, IR, Radio etc. These waves are classified according to their wavelengths and frequency.

Gamma rays have the highest frequency and thus are most energetic while radio waves smallest frequency and least energy.

The UV waves coming from the Sun have higher frequency than visible light and thus are more energetic. This is the reason that UV waves can cause skin cancer. The ozone layer in the atmosphere absorbs the UV waves. The increased level of pollution is affecting this layer and thus increasing the exposure to UV waves and hence risk of skin cancer.

Which of the following reflect the ideas of Manifest Destiny?
Select all that apply.

Final answer:

The fourth step in the scientific method is to accept or modify the hypothesis, dependent on whether the experimental data supports or contradicts it.

Explanation:

The fourth step in the scientific method is to accept or modify the hypothesis. After conducting experiments designed to test the hypothesis, a scientist must analyze the data collected. If the data supports the original hypothesis, it can be accepted and the scientist can proceed to the next step. However, if the data does not support the hypothesis, it may either be rejected or modified, often leading to further experimentation. This critical step ensures that scientific theories are continually refined and improved based on empirical evidence.

The answer is "B. The Sun".

When two forces act in the same direction, they add together, resulting in a greater overall force that can, for example, make it easier to move a heavy object.

When two forces act in the same direction, their effects add up, resulting in a larger overall force. This can be illustrated by imagining you and a friend trying to move a heavy box. If you both apply a force in the same direction, the resultant force on the box is the sum of your individual forces, making it easier to move the box. If, on the other hand, the forces were applied in opposite directions, the resultant force would be the difference between these two forces, according to which direction is assigned as positive. This reflects a basic principle in physics that forces are vectors and thus adhere to vector addition. It is important to note that this concept is different from Newton's third law, which states that for every action, there is an equal and opposite reaction, but this law refers to forces between two different bodies, rather than the cumulative effect of forces acting on the same body in the same direction.