Need help please!!!!!!!!!!!!!!!!!

Answer:

Weather and erosion

Explanation:

Thats what makes sediment rocks sediment rocks

Answer:

the beat frequency heard by the observed is 58.8 Hz.

Explanation:

Given;

frequency of the source, Fs = 1,000 Hz

velocity of the source, Vs = 20 m/s

velocity of sound, V = 340 m/s

The frequency heard by the observer behind the source is calculated by applying Doppler effect;

[tex]F_s = F_o [\frac{v}{v-v_s} ]\\\\1000 = F_o [\frac{340}{340 -20} ]\\\\1000 = 1.0625F_o\\\\F_o = 941.2 \ Hz[/tex]

The beat frequency heard by the observed = 1000 - 941.2 = 58.8 Hz.

Therefore, the beat frequency heard by the observed is 58.8 Hz.

Answer:

Explanation:

[tex]N_1[/tex] = frequency observed by observer when source goes away from the observer

[tex]N_2[/tex] = when source coming towards observer

[tex]N_1 = m(\frac{V-V_o}{V})\\\\N_1 = 1000(\frac{340-20}{340})\\\\N_1 = 941.17[/tex]

[tex]N_2 = m(\frac{V+V_o}{V})\\\\N_2 = 1000(\frac{340+20}{340})\\\\N_2 = 1058.82[/tex]

Therefore,

[tex]N_2 - N_1 = 1058.82 - 941.17[/tex]

Beat frequency = [tex]117.65Hz[/tex]

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Answer: a. (Q), (T), (E)

              b. (Q), (T), (E), (W)

Explanation: Thermal Energy and Temperature are closely related: when the temperature rises causing atoms or molecules to move, thermal energy is produced. Thermal energy is the energy within the system.

Mechanical Work is the amount of energy transferred due to an applied force.

Chemical Energy is the energy contained in the bonds of chemical structures of the molecules released when a chemical reaction happens.

Given the explanations, let's analyse the situations:

a. For an ice cube to be melting, it has to be absorbing heat, which means its thermal energy is changing and, consequently, so does its temperature;

b. First, the gas inside the cylinder reaches a thermal equilibrium, which means its thermal energy and temperature changed. Since there were  exchange of heat to reach the equilibrium, the gas absorbed or gave off heat. After the equilibrium, when the piston starts to be moved, the energy of the pressure is transferred to the gas, so mechanical work had been done.

Answer:

the centripetal acceleration of the puck is 27 m/s²

Explanation:

Given;

radius of the circular path, r = 3.0 m

velocity of the puck in the circular motion, v = 9.0 m/s

The centripetal acceleration of the puck is calculated as;

[tex]a_c = \frac{v^2}{r} \\\\a_c = \frac{(9)^2}{3} \\\\a_c = 27 \ m/s^2[/tex]

Therefore, the centripetal acceleration of the puck is 27 m/s²

Answer:

367500Joules

Explanation:

Work done is expressed as;

Work done = force × distance

Force = mass × acceleration due to gravity

Force = 1500×9.8

Force = 14700N

Given

Distance covered = 25m

Workdone = 14700×25

Work done = 367500Joules

Hence the work done by the tension in the elevator cable is 367500Joules

Answer:

The gap between seeing the flash and hearing the thunder is 12.12 seconds.

Explanation:

As sound travels at 330 meters per second, while light travels almost instantaneously, to determine the gap between seeing the flash and hearing the sound of thunder from a storm at 4 km, the following calculation must be performed:

4 km = 4,000 m

4,000 / 330 = X

12.12 = X

Therefore, the gap between seeing the flash and hearing the thunder is 12.12 seconds.

Answer: (D) Two countries go to war with one another.

Explanation: I checked.

Given,

The radius of Sun, [tex]r=1.5\times 10^{11}\ m[/tex]

To find,

The centripetal acceleration of the Earth towards the Sun.

Solution,

The centripetal acceleration of an object is given by the formula as follows :

[tex]a=\omega^2 r[/tex] ....(1)

Where

[tex]\omega[/tex] is angular velocity

First calculate the angular velocity.

[tex]\omega=\dfrac{2\pi}{1\ \text{day}}\\\\=\dfrac{2\pi}{24\times 3600\ s}\\\\=7.27\times 10^{-5}\ s^{-1}[/tex]

Put all the values in formula (1)

[tex]a=\omega^2 r\\\\=(7.27\times 10^{-5})^2\times 1.5\times 10^{11}\\\\=792.79\ m/s^2[/tex]

So, the centripetal acceleration of the Earth towards the Sun is [tex]792.79\ m/s^2[/tex].

Answer:

1.Stress is a feeling that's created when we react to particular events.

2. What signals the adrenal glands to produce more of the hormones adrenaline and cortisol and release them into the bloodstream?hypothalamus. ... 3. When the adrenal glands produce more of the hormones adrenaline what are two of the body’s reaction to these additional hormones:heart rate speeds up and sweat is produced. 4.the stress response the bodies natural way of dealing with anxiety. 5. the events that provoke stress are job issues or retirement. lack of time or money. grief. family problems. The article talks about building up your resilience to cope with stress. What does resilience mean? the capacity to recover quickly from difficulties. 6. What are two ways that you can control stress? be realistic and get a good night's sleep.

Answer:

D. Gas

Explanation:

There are only three states of matter: solid, liquid and gas. This makes choice c (Mixture) incorrect because it is not part of the group.

The particles in gas are widely separated, which means there's a lot of free space between the particles. This makes it easily compressible. The particles then move past each other, which causes no regular arrangement.

Answer:

The speed of the astronaut is 0.25 m/s in the opposite direction to the oxygen tank.

Explanation:

Using the conservation of linear momentum, we have:

[tex]p_{initial}=p_{final}[/tex]

The initial momentum is zero because both of them are at rest, so we just have a final momentum.

[tex]0=m_{astro}V_{f-astro}+m_{tank}V_{f-tank}[/tex]

[tex]m_{astro}V_{f-astro}=-m_{tank}V_{f-tank}[/tex]

[tex]V_{f-astro}=-\frac{V_{f-tank}m_{tank}}{m_{astro}}[/tex]

[tex]V_{f-astro}=-\frac{2*10}{80}[/tex]

[tex]V_{f-astro}=-0.25\: m/s[/tex]

Therefore, the speed of the astronaut is 0.25 m/s in the opposite direction to the oxygen tank.

I hope it helps you!  

Answer:

287cm^3

Explanation:

Given data

Density of aluminium= 2.7g/cm^3

mass of aluminium= 775g

The volume occupied is given as

we know that

density= mass/volume

volume= mass/density

volume= 775/2.7

volume= 287 cm^3

Now based on Archimedes principle, which states that when a body is totally or partially submerged in a fluid it experiences an upthrust which is equal to the volume of the mass displaced

Therefore, the volume of oil displaced is 287cm^3

Answer:

Explanation:

Let h be the height .

initial velocity in first case u = 0

final velocity v = 6 m /s

acceleration due to gravity g = 9.8 m /s²

v² = u² + 2 g h

6² = 0 + 2 x 9.8 x h

h = 1.837 m .

For second case u = 3 m /s

v² = u² + 2 gh

= 3² + 2 x 1.837 x 9.8

= 9 + 36

= 45 m

v = 6.7 m /s

Answer:

[tex]Q_+=1.36*10^5C[/tex]

[tex]Q_+=-1.36*10^5C[/tex]

Explanation:

From the question we are told that

Mass of old penny [tex]M=3.1g[/tex]

Generally the number of moles in a penny is given mathematically as

[tex]n=\frac{M}{A}[/tex]

[tex]A=atomic\ number\ of\ copper=>63.5g/mol[/tex]

Therefore

[tex]n=\frac{3.1}{63.5}[/tex]

[tex]n=0.049mol[/tex]

[tex]Avogadro\ Number=(6.023*10^2^3 atom/mol[/tex]

Therefore

[tex]N=(6.023*10^2^3 atom/mol *0.049mol[/tex]

[tex]N=2.939*10^2^2atoms[/tex]

Generally the Total positive charge of the copper is given by

Since its the 29th atom of the periodic table

29 protons

29 electrons

[tex]Q_+=29(2.939*10^22)(1.6*10^1^9)[/tex]

[tex]Q_+=1.36*10^5C[/tex]

Generally the Total negative charge of the copper is given by

[tex]Q_+=29(2.939*10^22)(-1.6*10^1^9)[/tex]

[tex]Q_+=-1.36*10^5C[/tex]

Answer:

[tex]a=11.86*10^1^5 m/s[/tex]

[tex]a=3.91864074*10^-^2^4 m/s^2[/tex]

[tex]a=3.95426275*10^-^2^4m/s^2[/tex]

Explanation:

From the question we are told that

The surface charge density on the disk is [tex]\sigma=+4.00 \mu C/m^2[/tex]

[tex]\varepsilon _0= 8.85 * 10^–12 F/m.[/tex]

a)Generally the electric field in this situation is given as  is mathematically given as

  [tex]E=\frac{\sigma}{\varepsilon_0} (1-\frac{R}{\sqrt{2}R}[/tex]

  [tex]E=\frac{\sigma}{\varepsilon_0} (1-\frac{1}{\sqrt{2}})[/tex]

  [tex]E=67.48*10^3 f/a[/tex]

Generally the Force of release of the electron  is mathematically given as

[tex]F=eE[/tex]

[tex]F=ma[/tex]

[tex]a*m=\frac{eE}{1}[/tex]

[tex]a=\frac{1.6*10^-^1^9 *67.48*10^3}{9.1*10^3^1}[/tex]

[tex]a=11.86*10^1^5 m/s[/tex]

b)Generally the electric field in R/100 from the center of the disk is given as  is mathematically given as

Generally

 [tex]E=\frac{\sigma}{\alpha \varepsilon_0}(1-\frac{1}{\sqrt{(100)^2} }[/tex]

 [tex]E=\frac{4.0*10^-^6}{2*8.854*10^-^1^2}(1-\frac{1}{\sqrt{(1+(100)^2} })[/tex]

 [tex]E=2.22872692*10^2^7[/tex]

Generally the Force of release of the electron  is mathematically given as

 [tex]a*m=\frac{eE}{1}[/tex]

 [tex]a=\frac{1.6*10^-^1^9 *2.22872692*10^2^7}{9.1*10^3^1}[/tex]

 [tex]a=3.91864074*10^-^2^4 m/s^2[/tex]

c)Generally the electric field in R/1000 from the center of the disk is given as  is mathematically given as

 [tex]E=\frac{\sigma}{\alpha \varepsilon_0}(1-\frac{1}{\sqrt{(1000)^2} }[/tex]

 [tex]E=\frac{4.0*10^-^6}{2*8.854*10^-^1^2}(1-\frac{1}{\sqrt{(1+(1000)^2} })[/tex]

[tex]E=2.24898694*10^2^7[/tex]

Generally the Force of release of the electron  is mathematically given as

 [tex]a*m=\frac{eE}{1}[/tex]

 [tex]a=\frac{1.6*10^-^1^9 *2.24898694*10^2^7}{9.1*10^3^1}[/tex]

 [tex]a=3.95426275*10^-^2^4m/s^2[/tex]

The temperature of the mixture in degrees centigrade is 36.5°C.

The heat lost by the melting ice is equal to the heat gained by the tomato juice and water.

Where;

Heat lost by ice = mL = 0.062 Kg × 33600 J/Kg = 2083.2 J

Heat gained by tomato juice = 0.751 Kg × 3,980 J/kg · °C ( T - 39°C)

Heat gained by water = 0.062 Kg × 4200 J/kg · °C ( T - 0°C)

Hence;

2083.2  = [2988.98T - 116570] + [260.4T - 0]

2083.2 = 2988.98T + 260.4T -  116570

2083.2 =3249.38 T - 116570

2083.2 + 116570 = 3249.38 T

T = 36.5°C

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Answer:

The correct answer is B)

Explanation:

Solution:

The correct answer is B)

Because,  

Runner is applying a force and forwarding ahead which creates equal and opposite frictional force by the ground. But key point here is that, the equal and opposite force is acting on different objects not on the runner. As, friction force will be applied to the heavy mass and the runner by the ground. So, Runner will always apply greater and opposite force than the total friction force that he is experiencing because of heavy mass friction and its friction due to ground in order to move ahead.

For example, if you pull a empty cart with equal and opposite force, then the cart will not move, as the net force is zero. So, in order to move the cart. you have to apply greater and opposite force.

Answer:

Machines reduce the time of work hence reducing the rate of doing work ( power ).

Machines e.g pulleys carry heavy loads with a less and reasonable effort.

Machines e.g generators induce current in a limited amount of time

Answer:

they can do work easier for an example a car a car make things easier by going some were far it can also be used to help people travel instead of a plane it can also be used for carriying things like a boat. (you can put it in a diffrent way)

Explanation:

hope it helps! :)

Explanation:

The tension on an object is equal to the mass of the object x gravitational force plus/minus the mass x acceleration. Tension Formula Questions: 1) There is a 5 kg mass hanging from a rope.

Answer:

m = 0.305 [kg]

Explanation:

When a body rests on a horizontal surface and is in balance we can say that normal force is the reaction of the weight of a body.

Weight is defined as the product of mass by gravitational acceleration.

[tex]N=W=m*g[/tex]

where:

N = normal force = 3 [N]

g = gravity acceleration = 9.81 [m/s²]

m = mass [kg]

Now replacing:

[tex]3=m*9.81\\m=0.305[kg][/tex]

Answer: 14.5 N

Explanation:   NEED SCRATCH PAPER: A flower pot weighing 42.0 N (newtons) is hung above a window by three ropes, each making an angle of 15.0 degrees with the vertical. What is the tension in each rope supporting the flower pot?

✓ 14.5 N

found it on the internet?

Answer:

The sprinter traveled a distance of 7.5 m

Explanation:

Motion With Constant Acceleration

It's a type of motion in which the rate of change of the velocity of an object is constant.

The equation that rules the change of velocities is:

[tex]v_f=v_o+at\qquad\qquad [1][/tex]

Where:

a   = acceleration

vo = initial speed

vf  = final speed

t    = time

The distance traveled by the object is given by:

[tex]\displaystyle x=v_o.t+\frac{a.t^2}{2}\qquad\qquad [2][/tex]

Using the equation [1] we can solve for a:

[tex]\displaystyle a=\frac{v_f-v_o}{t}[/tex]

The sprinter travels from rest (vo=0) to vf=7.5 m/s in t=2 s. Computing the acceleration:

[tex]\displaystyle a=\frac{7.5-0}{2}[/tex]

[tex]a=3.75\ m/s^2[/tex]

Now calculate the distance:

[tex]\displaystyle x=0*2+\frac{3.75*2^2}{2}[/tex]

[tex]\displaystyle x=7.5\ m[/tex]

The sprinter traveled a distance of 7.5 m

Answer: The correct option is option E (the Sun is seen blocking different constellations in the course of a year.

Explanation:

The earth, which is one of the planets of the solar system that supports life, is shperical in shape. The spherical ( round) shape of the earth is marked by the intervening highlands and oceans on its surface.

Evidence to show that the earth is shperical are:

--> The Lunar eclipse: During an eclipse of the Moon, the shadow of the Earth is always seen to be round.

--> Ships Visibility: When ships travel a large distance away, we see their hulls disappear first and their masts disappear last.

-->Altitude of Polaris (North Star): The height of the North Star changes as we travel to different latitudes. That is ,increases as you move toward the North pole, or decreases as you move toward the equator.

--> Aerial photographs: Photographs of the Earth from space always show a round body.

The statement that doesn't prove that the earth is spherical in shape is (the Sun is seen blocking different constellations in the course of a year). The sun is seen in front of stars blocking different constellation in a year because the earth orbits round the sun in a year and not that it is shperical in shape.

Answer:

huh

Explanation:

Answer:

work energy equation

[tex]w.d(external)= \delta \: k.e+ \: \: \ \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: w.d(ressesive)[/tex]

Explanation:

first of all we have to find reaction force to find fr

[tex]fr = \mu \: mg \\ mg = reaction \: force(r) \\ f = ma \\ r + 40 \sin(22) - 150 = 0 \\ r = 150 - 40 \sin(22) [/tex]

then let's find friction

[tex]fr = \mu \: r \\ 0.2 \times (150 - 40 \sin(22) )[/tex]

then let's apply work energy principle...its on the 2nd picture

Answer:

because the red and blue regions are the optimum regions for photosynthesis.

Explanation:

Artificial plant-growth lights have a light spectrum that favors the red and blue portions of the spectrum because the red and blue regions are the optimum regions for photosynthesis.

Plants generally need photosynthesis to survive because, during the process, their food is synthesized. The process requires light energy to be absorbed by the green pigment of the plant - the chlorophyll. The light energy excites some electrons of the photosystems of the chlorophyll, leading to the release of the electron. The electron thus travels in an electron transport chain, eventually utilized to generate energy-rich molecules that are later utilized in other parts of the process to manufacture food.  

Investigations have revealed that the process of photosynthesis proceeds optimally in the red and light regions of the light spectrum. The discovery has made the manufacturers of artificial plant-growth light to engineer their products to favor more of these two light regions above the rest of the visible light spectrums.

When energy is produced from the light source of various frequencies, wavelengths and energies are called the light spectrum. It is estimated in nm (nanometers).

Plants favour the red and blue light spectra because they absorb and receives the most amount of light.

The phenomena can be explained as:

Therefore, blue and red favours photosynthesis.

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