Across a resistor, the potential:

increases
decreases
remains constant

Let the salmon jump with speed v at an angle of 33.3 degree

So here we can find out the components of his velocity in x and y direction

[tex]v_x = v cos33.2[/tex]

[tex]v_y = v sin33.2[/tex]

now the horizontal displacement of the salmon is 3.15 m so he cover this horizontal distance with constant speed as there is no acceleration in x direction

here we can say

[tex]v_x * t = 3.15[/tex]

[tex]v cos33.2 * t = 3.15[/tex]

[tex]v*t = 3.76[/tex]

now in Y direction it is an accelerated motion as it is accelerated due to gravity

[tex]y = v_y * t + \frac{1}{2}at^2[/tex]

[tex]-0.45 = v sin33.2* t - \frac{1}{2}*9.8* t^2[/tex]

now we will plug in v*t = 3.76

[tex]-0.45 = 3.76 * sin33.2 - 4.9 * t^2[/tex]

[tex]4.9 t^2 = 2.51[/tex]

[tex]t^2 = 0.512[/tex]

[tex]t = 0.72 s[/tex]

now speed v is given by equation above

[tex]v*t = 3.76[/tex]

[tex]v*0.72 = 3.76[/tex]

[tex]v = 5.25 m/s[/tex]

so here he must have to jump with minimum speed of 5.25 m/s

Mass of the sound reflector is given as

[tex]m_1 = 170 kg[/tex]

mass of the chain itself is

[tex]m_2 = 8 kg[/tex]

now here since this system is suspended at rest and no acceleration is given for the system so in order to find the tension in the chain we will just use force balance equation

As per force balance we can say that weight of the chain and reflector downwards will be counter balanced by tension in the string

Now here we will have

[tex]T = m_1g + m_2g[/tex]

since chain is given with some mass so tension at the top end of the chain will be

[tex]T = 170* 9.8 + 8 * 9.8[/tex]

[tex]T = 1744.4 N[/tex]

So here tension in the chain will be 1744.4 N at the top end and this tension will decrease as we move down along the length of the chain.

The use of force to move an object is defined as 'work' in physics. Work is done when a force moves an object. The amount of work is measured as force multiplied by distance.

The use of force to move an object is called work. This is a fundamental concept in Physics, specifically in the field of mechanics. According to this principle, work is done when a force that is applied to an object moves that object. For instance, when you push a box and it moves, you're doing work on the box. The amount of work done is calculated by multiplying the force by the distance over which it is applied (Work = Force x Distance). If there is no movement despite the force applied, no work is done according to physics.

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The answer is D) 4,3,2

Just had this question

B) are compressible.  

gasses are compressible

Answer: Option (B) is the correct answer.

Explanation:

Noble gases group 18 elements. Members of this group are He, Ne, Ar, Kr, Xe, and Rn.

All these elements have completely filled sub-shells and hence they are stable in nature. All the elements of group 18 are gases, this means that their particles are loosely held due to weak intermolecular interaction.

As a result, their particles can move freely from one place to another. These gases can be compressed in order to bring their particles together. It is also known that all gases are compressible in nature.

Thus, we can conclude that noble gases have one property in common is that they are compressible.

D.  

It increased deposition downstream.

Answer:

D. It increased deposition downstream.

Explanation:

Tailing is the material leftover after separation of valuable material from ore. Tailing ponds are made near moving water are not good for water as they increase water pollution. In case of waste rocks from mine dumped near water body such as river, may reduce the depth of river bed and increase chances of flood. These deposits also increase deposition downstream and form big deltas.

I’m not sure but I’m guessing wind.

Answer:

wind

Explanation:

From powering ships and windmills to wind-farms that generate electricity, wind has proven to be somewhat useful.

A chemical reaction produced a gas. This was the observation done for the experiment performed by Bethany.

Answer: A

Explanation

Baking soda which is chemically known as sodium bicarbonate reacts with acidic agents like lemon juice or vinegar forming a bubbling like thing.

The sodium bicarbonate undergoes a chemical reaction with the acidic solution and the product of this reaction is the formation of carbon di oxide gas as bubbles and fizzing.

In this case, the pickle solution contains acidic substance like vinegar and lemon juice extract so when it reacts with sodium bicarbonate or baking soda, the carbon-di-oxide present in the sodium bicarbonate (NaHCo3) will be released as gas in the form of bubbles and fizzes on the surface of the solution.

Second sound is a quantum mechanical phenomenon in which heat transfer occurs by wave-like motion, rather than by the more usual mechanism of diffusion. This leads to a very high thermal conductivity. It is known as "second sound" because the wave motion of heat is similar to the propagation of pressure waves in air (sound).

Normal sound waves are fluctuations in the density of molecules in a substance; second sound waves are fluctuations in the density of particle-like thermal excitations (rotons and phonons[1]). Second sound can be observed in any system in which most phonon-phonon collisions conserve momentum. This occurs in superfluids,[2] and also in some dielectric crystals[3][4][5] when Umklapp scattering is small. (Umklapp phonon-phonon scattering exchanges momentum with the crystal lattice, so phonon momentum is not conserved.)

wikipedia sourced to

Answer:

Its a

Explanation:

C is the correct option

As momentum = (mass) (velocity)

P=mv

So the object having greater mass has less velocity and the object having smaller mass will move faster. But product of mass and velocity is same to each other.

The archer is fired horizontally.

It hits the target which is at 100 m distance.

The horizontal velocity of the archer is always constant for a projectile in this situation.

The total time of flight is given as 2.2 s

Let the initial velocity is u .

Hence the target distance = ut

                 ⇒ 100 m = u×2.2 s

                   ⇒u = 100÷2.2 m/s

                           =45.45 m/s

We are asked to calculate the vertical distance travelled.

The vertical distance travelled is calculated as-

                                      [tex]s= ut +\frac{1}{2} at^2[/tex]  [ s is the distance and a is the acceleration]

                                      [tex]s = 0*2.2 -\frac{1}{2} g[2.2]^2[/tex] [g is te acceleration due to gravity]

                                      [tex]s=\frac{1}{2} 9.8*[2.2]^2[/tex]  [here we have taken only magnitude]

                                             =23.716 m       [ans]

Solution is attached.

Answer:

C. 8.1 × 103 newtons

Explanation:

Latent heat is related to changes in phase between liquids ,gases and solids.

Sensible heat is related to changes in temperature of a gas or object with no change in phase.

Answer

224 Km

4 Km

Explanation

Part 1

The plane flies 100 Km north and then 200 Km east. This makes a 90° turn. To get the distance taken by the plane we get the hypotenuse.

c² = a² + b²

c² = 100² + 200²

   = 50,000

c = √50,000

    = 223.606 Km

The answer to the nearest whole number is 224 Km

Part 2

If the runner run 15 Km north then 11 Km south, the resultant distance would be,

15 - 11 = 4 Km

Here it is an application of Newton's III law

as we know by Newton's III law that every action has equal and opposite reaction

So here as we know that two boys jumps off the boat with different forces

from front side of the boat the boy jumps off with force 45 N which means as per Newton's III law if boy has a force of 45 N in forward direction then he must apply a reaction force on the boat in reverse direction of same magnitude

So boat must have an opposite force on front end with magnitude 45 N

Now similar way we can say

from back side of the boat the boy jumps off with force 60 N which means as per Newton's III law if boy has a force of 60 N in backward direction then he must apply a reaction force on the boat in reverse direction of same magnitude

So boat must have an opposite force on front end with magnitude 60 N

So here net force due to both jump on the boat is given by

[tex]F_{net} = F_1 - F_2[/tex]

[tex]F_{net} = 60 - 45[/tex]

[tex]F_{net} = 15 N[/tex]

so boat will have net force F = 15 N in forward direction due to both jumps

answer is C. dressing to protect hands

Answer:

Explanation:

The epithelial tissues cover the body surfaces, forms a lining over the body cavities and hollow organs. These tissues also forms a protective barrier between the external environment and the body.

The epithelial tissues are the tissues which performs various functions. These tissues are composed of cells that are laid close to each other with the cells that lies in the close association with each other. The structure and function of the epithelial cells vary from both upper and lower surfaces. Due to variety in the functions of the epithelial tissues like protection, secretion, cellular transportation, filtration, selective absorption and sensing, these are called as the versatile tissues.

B. Scientific theories attempt to explain why natural events occur.

Answer: B. Scientific theories attempt to explain why natural events occur.

Explanation:

The scientific theories are the detailed explanations which gives reasons for the cause of natural events, processes and phenomena that occur in the natural world. These are supported by the evidences and observations that are obtained through experimental trials. These theories can be changed due to the changing of facts due to further experimental studies conducted by new generation scientists.

The ball's horizontal position [tex]x[/tex] at time [tex]t[/tex] is

[tex]x=v_{0x}t[/tex]

The ball has initial velocity in the horizontal direction only, so [tex]v_{0x}=15\,\frac{\mathrm m}{\mathrm s}[/tex]. Then the time it takes for the ball to travel 83 m horizontally [tex]t[/tex] is given by

[tex]83\,\mathrm m=\left(15\,\dfrac{\mathrm m}{\mathrm s}\right)t\implies t=5.5\,\mathrm s[/tex]

Meanwhile, the ball's vertical position [tex]y[/tex] at time [tex]t[/tex], starting at the height of the cliff [tex]h[/tex], is given by

[tex]y=h-\dfrac12gt^2[/tex]

where [tex]g=9.8\,\frac{\mathrm m}{\mathrm s^2}[/tex] is the acceleration due to gravity. After 5.5 seconds, the ball hits the ground, so that [tex]y=0[/tex] when [tex]t=5.5\,\mathrm s[/tex], and we use this to solve for [tex]h[/tex]:

[tex]0=h-\dfrac12g(5.5\,\mathrm s)^2\implies h\approx150\,\mathrm m[/tex]

An object moving at constant speed in a straight line would move differently if acted on by unbalanced forces, as indicated by Newton's first and second laws. Unbalanced forces would cause changes in the object's velocity, either in speed, direction, or both.

An object moving at constant speed in a straight line would move differently if it was acted on by unbalanced forces. According to Newton's first law, an object will continue in its state of motion at constant speed in a straight line unless it is compelled to change by an external force. This principle refers to the inertia of the object.

For instance, the answer option 'B. It is acted on by unbalanced forces.' would make the object move differently. Unbalanced forces will cause the object to either speed up, slow down, or change its direction of motion. If there are exactly opposing forces (option 'C'), assuming they are equal in magnitude, they would balance each other out and the object will continue to move at the same speed in the same direction.

Newton's second law further explains that the rate of change of momentum of an object is directly proportional to the unbalanced force acting on it and takes place in the direction in which the force acts. As such, any presence of unbalanced forces will result in a change in the object's velocity - either speed, direction, or both - meaning the object's motion would be different.

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Answer:

Energy in KWH  = Power in KW * Time in hours

Cost  is # of KWH  * the cost per KWH

                      350 kwh

Explanation:

The monthly cost of using a 700-W refrigerator that runs for 10 h a day if the cost per kWh is $0.20 is $42.

The cost price per watt is the amount of money required to use one watt or kilo watt electricity,

To find the total cost of electricity used, multiply the cost price of electricity per watt to total watts of electricity used.

Given information-

The power used by the refrigerator is 700- W per hour.

Total run time of the refrigerator is 10 hours per day.

The cost of the electricity is $0.20 kWh.

As, the power used by the refrigerator is 700- W per hour and total run time of the refrigerator is 10 hours per day. The power used by the refrigerator per day is,

[tex]P=700\times10\\P=7000\rm Wh\\P=7\rm kWh[/tex]

There is total 30 days in a month. Thus the total  power used by the refrigerator per month is,

[tex]P=7\times30\\P=210\rm kWh[/tex]

As the cost of the electricity is $0.20 kWh. Thus the cost of 210 kWh electricity is,

[tex]C=0.2\times210\\C=42[/tex]

Thus the monthly cost of using a 700-W refrigerator that runs for 10 h a day if the cost per kWh is $0.20 is $42.

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i would say line graph

Answer: a. line graph

Explanation:   A line graph is formed by joining the points given by the data with straight lines.

A line graph is usually used to show the change of information over a period of time using two variables . This means that the horizontal axis is usually a time scale, for example minutes, days, months or years; and the vertical axis shows the value of the information that varies in time.

Here object is dropped from height "h"

so we can say its initial speed is zero

and it will accelerate downwards due to gravity

now we can say it will take time T to hit the ground

now we can use

[tex]h = v_i*t + \frac{1}{2}gt^2[/tex]

[tex]h = 0 + \frac{1}{2}*gT^2[/tex]

now it is given that it will take 1 second to drop h/2 height to strike the ground

so here we have can say that in "T - 1" s it will cover the h/2 distance from start

[tex]h/2 = 0 + \frac{1}{2}g(T-1)^2[/tex]

now we can say

[tex]h = g(T-1)^2[/tex]

from above two equations we have

[tex]\frac{1}{2}gT^2 = g(T-1)^2[/tex]

[tex]T^2 = 2(T^2 + 1 -2T)[/tex]

[tex]T^2 - 4T + 2 = 0[/tex]

[tex]T = 3.41 s[/tex]

now we can find total height of the drop by first equation

[tex]h = \frac{1}{2}gT^2[/tex]

[tex]h = \frac{1}{2}*9.81*3.41^2[/tex]

[tex]h = 57.2 m[/tex]

The answer is: 12.30 degrees.

To solve this problem you must apply the proccedure shown below:

1. You run 22 meters horizontally and then you climb a rope vertically for 4.8 meters.

2. So. let's call the angle [tex]\alpha[/tex], therefore, you must find it using [tex]tan^{-1}[/tex], as following:

[tex]tan^{-1}(\alpha)=\frac{opposite}{adjacent} \\opposite=4.8\\adjacent=22[/tex]

3. Substitute values and solve for the angle:

[tex]tan^{-1}(\alpha)=\frac{4.8}{22}\\\alpha=12.30degrees[/tex]

Planets move in elliptical orbits and this theory was formulated by Johannes Kepler.  Kepler's laws of planetary motion defined a set of rules followed by the planets while revolve around the sun and determines their orbits.  

This modified the earlier theory of circular orbits from Nicholas Copernicus.

Kepler made two key modifications to Copernicus's model:

1. Kepler modified the circular orbits of planets proposed by Copernicus into elliptical orbits.

2. Kepler introduced the concept of varying planetary speeds along their orbits, rather than assuming constant speeds as Copernicus did.

To calculate the modifications Kepler made:

1. Elliptical Orbits:

  - Kepler's first law states that planets move in elliptical orbits with the Sun at one of the foci. The formula for an ellipse is [tex]\( \frac{x^2}{a^2} + \frac{y^2}{b^2} = 1 \)[/tex], where [tex]\( a \)[/tex] is the semi-major axis and [tex]\( b \)[/tex] is the semi-minor axis.

  - In contrast, Copernicus's model assumed perfect circular orbits with the Sun at the center.

2. Varying Planetary Speeds:

  - Kepler's second law states that a line segment joining a planet and the Sun sweeps out equal areas during equal intervals of time. Mathematically, this is expressed as [tex]\( \frac{dA}{dt} = \text{constant} \),[/tex]where [tex]\( A \)[/tex] is the area swept and [tex]\( t \)[/tex] is time.

  - Copernicus's model assumed uniform orbital speeds for planets.

Kepler's modifications were revolutionary as they better explained observations such as varying planetary brightness and retrograde motion. These changes laid the foundation for modern celestial mechanics and our understanding of planetary motion.

Complete Question:

What modifications did Kepler make to Copernicus model?

I would say B because not wearing a seatbelt is an example of risky behavior, which they’re were trying to prevent

it occurs when the energy of the combination has lower energy than the separated atoms

When an electron is accelerated through potential difference then the speed that it attain will be explained by energy conservation

here by energy conservation we can say that

change in kinetic energy of electron = electrostatic potential energy gained through given potential difference

kinetic energy is given as

[tex]KE = \frac{1}{2}mv^2[/tex]

electrostatic potential energy is given as

[tex]PE = qV[/tex]

now by energy conservation

[tex]qV = \frac{1}{2}mv^2[/tex]

given that for electron

[tex]m = 9.1 * 10^{-31} kg[/tex]

[tex]v = 3 * 10^7 m/s[/tex]

[tex]q = 1.6 * 10^{-19} C[/tex]

now by plug in values

[tex]1.6 * 10^{-19} * V = \frac{1}{2}*9.1* 10^{-31} *(3*10^7)^2[/tex]

[tex]V = \frac{4.095 * 10^{-16}}{1.6 * 10^{-19}}[/tex]

[tex]V = 2559.4 Volts[/tex]

So here it is accelerated through potential difference of 2559.4 Volts

The electric potential is 4100 V or 4.1kV.

We know that the kinetic energy of the moving electron is equal to the 1/2mv^2. On this basis, we can write;

1/2mv^2 = eV

Where;

m = mass of the electron

v = speed of the electron

V = potential of the electron

e = charge on the electron.

Hence;

V = 1/2mv^2 /e

V = 0.5 × 9.11 × 10^-31 × (3 × 10^7)^2/1.6 ×10^-19

V = 4100 V or 4.1kV

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Answer:

the elements towards the bottom left corner

Explanation:

Metals are the substances which tend to lose their valence electrons in order to attain stability.

For example, metals of group 1 are lithium, sodium, potassium, rubidium and cesium.

And, each of these elements have only 1 valence electron present. So, it is much easier to lose just one electron rather than losing 2 or 3 valence electrons.

Hence, alkali metals are the most reactive substances of the periodic table and they are present at extreme left side of periodic table.

Therefore, we can conclude that the most reactive metals are located at the extreme left of the periodic table.