which statement describes what happens when light enters water? responses it speeds up. it speeds up. its speed stays the same. its speed stays the same. it can't get back out. it can't get back out. it slows down.

Answer:

(a) 0.71 mm

(b) 0.158 cubic cm

Explanation:

The width of one wire is the diameter of the wire.

(a) Let the diameter of each wire is d.

So, 10 d = 14.2 mm

d = 1.42 mm

radius of each wire, r = d/2 = 1.42/2 = 0.71 mm

(b) Length, L = 10 cm

The volume of the single wire is given by

\(V =\pi\times r^2\times h \\\\V =3.14\times 0.071^2\times 10\\\\V =0.158 cm^3\)

The equivalent density of 5.02x10^-6 g/ml in pounds per cubic foot is approximately 0.312 lb/ft^3.

To convert the density from grams per milliliter (g/ml) to pounds per cubic foot (lb/ft³), we need to use the appropriate conversion factors. 1 g/ml is equal to 62.42796 lb/ft³. By multiplying the given density by the conversion factor, we can calculate the equivalent density in pounds per cubic foot as follows: Density in lb/ft³ = (Density in g/ml) * (Conversion factor) Density in lb/ft³ = (5.02x10^-6 g/ml) * (62.42796 lb/ft³) Density in lb/ft³ ≈ 0.312 lb/ft³ Therefore, the density of 5.02x10^-6 g/ml is approximately 0.312 lb/ft³.

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Answer:

The answers are red bone marrow and blood vessels.

Explanation:

Bone marrow is made of stem cells. These stem cells make red bone marrow, which creates blood cells and platelets for your blood.

Answer:

V = IR

Explanation:

V = voltage

I = current

R = resistance

A ball is thrown vertically upward with a velocity of 20m/s from the top of a multistory building. The height of the point where the ball is thrown is 25 m from the ground. The height will the ball rise is 20m. 5s long will it be before the ball hip the ground.

The direction of a body or object's movement is defined by its velocity. In its basic form, speed is a scalar quantity. In essence, velocity is a vector quantity. It is the speed at which distance changes. It is the displacement change rate.

A. for solving how high will ball go , velocity at the top point will be 0 this gives ,

s = v² - u² / 2a

= 0 - 20² / -2 × 10

= 20m

B. Time to reach maximum height can be obtained from v = u + at

0 = 20 + ( − 10 ) t

t = 2s

s = ut + 0.5at²

= 20 ( 2 ) + 0.5 ( −10 ) ( 2 )²

= 20m

Therefore, the total distance for maximum height is 45 m

s = ut + 0.5at²

45 = 0 + 0.5 ( 10 ) ( t )²

t = 3s

Then,

Total time = 3+2

= 5s

Thus, A ball is thrown vertically upward with a velocity of 20m/s from the top of a multistory building.The height will the ball rise is 20m. 5s long will it be before the ball hip the ground.

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Answer:

The type of metal of the wire

The distance from the wire

The amount of the current

Explanation:

According to the electronic configuration,the element which is most likely to form an ion with negative 2 charge  is the one which has six valence electrons and is in need of 2 electrons to complete the octet.

Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.

Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.

Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.

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The correct statement among the given options is b. The image could be real or virtual, depending on how far the object is past the focal point.

This statement accurately describes the behavior of a lens. When an object is placed beyond the focal point of a lens, a real and inverted image is formed on the opposite side of the lens.

This situation corresponds to a real image. However, if the object is placed between the lens and its focal point, the image formed is virtual, upright, and on the same side as the object.

Thus, depending on the object's position relative to the focal point, the image can be either real or virtual.

The image being erect or inverted (option c) and the image always being on the opposite side of the lens from the object (option d) are incorrect statements.

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The specific heat capacity of a substance is the energy needed to raise the temperature of 1 gram of the substance by 1 degree Celsius.

A substance's specific heat capacity (c), often known as its specific heat, is the amount of heat needed to increase 1 gram of that substance's temperature by 1 degree Celsius (or 1 kelvin). It can be expressed as follows:

c = q/mΔT

where q is the heat supplied, c is the constant of proportionality, called specific heat capacity of the body, m is the mass of the substance, and T is the temperature.

Just the type of substance that absorbs or releases heat determines a substance's specific heat capacity. It is an intense property—it doesn't matter how much of a substance there is; only its type does.

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Answer:

A proton and an electron have an equal amount but an opposite type of charge. Thus, if an atom contains equal numbers of protons and electrons, the atom is described as being electrically neutral

Answer:

Explanation:

Atoms are electrically neutral because they contain equal quantities of positively charged protons and negatively charged electrons. Electrons and protons have equal but opposite charges, so the result is no net charge. Ions are atoms that have gained or lost electrons. As a result, ions have a net charge.

The velocity (magnitude and direction) of the first bumper car after the collision is 12.6 m/s to the right.

What is Velocity?

Velocity is a physical quantity that describes the rate of change of an object's position with respect to time. It is a vector quantity, meaning it has both magnitude (the speed of the object) and direction (the direction in which the object is moving).

First, let's write down the conservation of momentum equation:

\(m_1\)\(v_1\)i + \(m_2\)\(v_2\)i = \(m_1\)\(v_1\)f + \(m_2\)\(v_2\)f

where \(m_1\) and \(m_2\) are the masses of the first and second bumper cars, \(v_1\)i and \(v_2\)i are their initial velocities, and \(v_1\)f and \(v_2\)f are their final velocities.

Substituting the given values, we get:

(188 kg)(20.4 m/s) + (143 kg)(-9 m/s) = (188 kg)\(v_1\)f + (143 kg)\(v_2\)f

Simplifying, we get:

3845.2 kg m/s = 188 kg \(v_1\)f + 143 kg \(v_2\)f

Next, let's write down the conservation of kinetic energy equation:

1/2\(m_1\)\(v_1\)i + 1/2 \(m_2\)\(v_2^2\)i = 1/2 \(m_1\)\(v_1\)f^2 + 1/2 \(m_2\)\(v_2\)\(f^{2}\)

Substituting the given values and the expression we obtained for \(v_2\)f from the momentum equation, we get:

1/2 (188 kg)\((20.4 m/s)^{2}\)2+ 1/2 (143 kg)\((-9 m/s)^{2}\) = 1/2 (188 kg)\(v_1\)\(f^{2}\) + 1/2 (143 kg)(3845.2 kg m/s - 188 kg \(v_1\)\(f^{2}\)

Simplifying and solving for \(v_1\)f, we get:

\(v_1\)f = 12.6 m/s to the right

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Using the formula of specific heat capacity, it can be calculated by measuring amount of heat transferred and temperature increased by this equipment.

The amount of energy needed to raise the temperature of 1 kilograms of tissue by 1 K (=1°C) is measured by the specific heat capacity of tissue, or c [J/(kg K)].

Frist, the temperature and the amount of heat of the vegetable oil in the beaker be measured. After that, its temperature should be increased up to certain  degrees by using electric heater and all the measurements will be noted.

Then using the formula of specific heat capacity, it can be calculated.

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Answer:

May I ask where you found that paper?

Answer:

vitamins don't contain calories

A beat frequency of 2.11 Hz would be heard. When the train car with the moving tuba approaches the stationary tuba, the sound waves emitted by the moving tuba are compressed, resulting in a higher frequency. This phenomenon is known as the Doppler effect. The beat frequency heard is the difference between the frequencies of the two tubas.

Using the formula: beat frequency = |f1 - f2|, where f1 is the frequency of the moving tuba and f2 is the frequency of the stationary tuba, we can calculate the beat frequency.

Since both tubas are playing the same tone at 69 Hz, f1 = f2 = 69 Hz.

When the train car approaches the station at a speed of 13.8 m/s, the frequency of the moving tuba is higher due to the Doppler effect.

Using the formula: f1' = f1 (v + vs) / (v - vd), where f1' is the frequency observed by the stationary observer, v is the speed of sound, vs is the speed of the source (tuba), and vd is the speed of the observer (stationary tuba), we can find f1'.

v = 343 m/s (at room temperature)

vs = 13.8 m/s (towards the stationary tuba)

vd = 0 m/s (stationary)

f1' = 69 x (343 + 13.8) / (343 - 0.0) = 71.11 Hz

The beat frequency is then:

|69 - 71.11| = 2.11 Hz

Therefore, a beat frequency of 2.11 Hz would be heard.

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Answer:

40,000N of force

Explanation:

The formula for force is F=ma. If we plug in the values, F=(20,000kg)(2m/s^2).

Answer:

The representation of a chemical reaction in the form of substances is known as a chemical equation. The equation in which the number of atoms of all the molecules is equal on both sides of the equation is known as a balanced chemical equation.

The Law of conservation of mass governs the balancing of a chemical equation.

According to this law, mass can neither be created nor be destroyed in a chemical reaction and obeying this law total mass of the elements or molecules present on the reactant side should be equal to the total mass of elements or molecules present on the produc

True. The partial pressure of gas that is made up of a mixture of gases is the sum of the individual pressure of the gases.

Dalton's law of partial pressure of gases is one of the gas laws that take into consideration the fact that a gas can be made from a mixture of non-reacting gases.

According to him, if a gas is made as such, the pressure of the gas would be the sum of the individual pressure of the component gases. This means that each gas contributes partially to the overall pressure of the gas mixture.

Thus, if gas A is a mixture of gas B and gas C. The pressure, P, of gas A is given as:

P = Pb + Pc where Pb and Pc are the partial pressure of gases B and C respectively.

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Answer:

ytytyt

Explanation:ytytytyt

1) After the push, the force causing the circular motion of the marble is the normal force between the marble and the plate.

2) The direction of this force is towards the center of the circular path.

3) When the marble exits the plate, assuming no external forces act upon it, it would continue moving in a straight line tangent to the circular path it was following before leaving the plate.

4) This path is chosen based on the principle of inertia.

1.

After the push, the force causing the circular motion of the marble is the normal force between the marble and the plate. The normal force is a contact force exerted perpendicular to the surface of contact. In this case, the surface of the marble pushes against the surface of the plate, creating the normal force that acts as the centripetal force required for circular motion.

2.

The direction of this force is towards the center of the circular path. According to the definition of the normal force, it always acts perpendicular to the surface of contact. Since the marble is moving in a circular path, the normal force must act inward towards the center of the circle, providing the centripetal force necessary to keep the marble in its circular trajectory.

3.

When the marble exits the plate, assuming no external forces act upon it, it would continue moving in a straight line tangent to the circular path it was following before leaving the plate. The predicted path would be a straight line continuing in the same direction as the marble's motion at the point of exit.

4.

This path is chosen based on the principle of inertia. According to Newton's first law of motion, an object in motion will continue moving in a straight line at a constant velocity unless acted upon by external forces. Since the marble is not influenced by any external forces after leaving the plate, it would continue along its original path, which was tangent to the circular trajectory.

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Given,

The mass of the softball, m=0.49 kg

The speed with which the ball was thrown, u=-20 m/s

The speed of the ball after the batter hits it, v=25 m/s

The time duration for which the bat acts on the ball, t=0.012 s

Here we have considered the direction from the pitcher to the batter as the negative direction and the direction from batter to the pitcher as the positive direction.

The momentum of an object is given by the product of the mass of the object and its velocity.

The change in the momentum of the ball is given by,

On substituting the known values,

The change in the momentum is equal to the impulse that acts on an object due to the applied force. And the impulse is given by the product of the applied force and the time duration.

Thus,

Where I is the impulse and F is the magnitude of the average force exerted by the bat on the ball.

On substituting the known values,

Thus the magnitude of the average force exerted by the bat on the ball is 1837.5 N

Answer:

Molecules are made up of atoms that are held together by chemical bonds. These bonds form as a result of the sharing or exchange of electrons among atoms. The atoms of certain elements readily bond with other atoms to form molecules. ... The element helium is a one-atom molecule. I hope this helps :)

Answer:

atoms held together by chemical bonds

Explanation:

Answer:

it'll stay the same unless there's rain

Given our understanding of physics, we can conclude that once the balloon is pushed under the surface, it will sink.

One key factor to take into account here is to remember that the density of a ballon can change when exposed to a higher pressure. This is due to the elastic nature of the material that makes up the ballon, and the nature of gas atoms that allow them to be compressed.

Therefore, when the balloon is pushed underwater, the surrounding water will squeeze the balloon, thus incrementing its density. Once the density of the balloon rises, this, in addition to the weight to which it is attached, will make it heavier than the water it is in, and the balloon will sink.

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Answer:

The current is halved

Explanation:

The relationship between the current and the resistance is given by Ohm's Law, as follows:

\(V = IR\\I = \frac{V}{R}\)

where,

V = Voltage

I = Current

R = Resistance

Therefore, if we double the resistance:

\(I' = \frac{V}{2R}\\\\I' = \frac{1}{2}I\)

Hence the correct option is:

The current is halved

Answer:

A

Explanation:

A machine is a physical system that use power to exert forces, regulate movement, and carry out an activity. Simple machines are very basic and make work easier.

What is machine ?

A machine is a physical system that use power to exert forces, regulate movement, and carry out an activity. The phrase is frequently used to describe both natural biological macromolecules, such as molecular machines, and man-made devices, such as those using engines or motors.

Any tool that simplifies work by adjusting a force is a machine. Every time a force pushes an item over a distance, work is done. Work = Force x Distance is an equation that measures the amount of work that is completed. You exert force on a machine when you operate it.

Simple machines are often used to lift big items with a pulley, to ride a bicycle, or to cut with a pair of scissors. It should be noted that a machine cannot be both a force multiplier and a speed multiplier.

Thus, option C is correct.

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Answer: max density = 2.65 g/cm3

min density = 2.45 g/cm3

Explanation:

max density = 2.55 + 0.10 = 2.65 g/cm3

min density = 2.55 - 0.10 = 2.45 g/cm3

Maximum density = 2.65  g/cm³.

Minimum density =  2.45  g/cm³.

The density of a substance reveals how dense it is in a certain space. The definition of density is the mass of a substance per unit volume. The degree to which matter is packed together is fundamentally measured by density. It is a specific physical quality of a specific object.

The student determined the density of the rock to be 2.55 ± 0.10 g/cm³.

So, Maximum density of the rock = 2.55 + 0.10 g/cm³ = 2.65  g/cm³.

Minimum density of the rock = 2.55 - 0.10 g/cm³ = 2.45  g/cm³.

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Answer:

?

Explanation:?