HELP ASAP 100 POINTS NEED ANSWERED ASAP

Answer:

Traveling 381m in 5 seconds means the average velocity is: 381m/5s = 76.2 m/s.

Explanation:

Letting x be the initial velocity and v the final velocity, we have:

12(x+v)=76.2m/s

and (since v=x+50),

12(2x+50)=76.2m/s

x+25=76.2m/s

x=51.2m/s

Answer:

-49 m/s

Explanation:

You would use the formula vf = vi + at, where vf stands for final velocity, vi stands for initial velocity, a stands for acceleration, and t stands for time. Assuming you're dropping the marble on Earth, the acceleration would be -9.8m/s², and the final velocity would be 0 m/s, as it stops after hitting the ground. (0 = vi + (9.8)(5))

Answer:

Q = 4.52 10¹⁷ J

Explanation:

Thermal energy can be calculated with  

      Q = m c_{e} ΔT

in this case it indicates that we approximate seawater to pure water with  

    c_{e} = 4186 J/ kg K  

with the density

    ρ = m / V  

    m = ρ V  

    V = L³  

we substitute  

   m = ρ L³  

   Q = ρ L3 c_{e} ΔT

calculate  

   Q = 1000 (3 103) 3 4186 4  

   Q = 4.52 10¹⁷ J

Answer:

The value is  [tex]u = 3.23 *10^{7} \ m/s[/tex]

Explanation:

From the question we are told that

   The diameter of the nucleus is [tex]d = 5.50 \ fm = 5.50 *10^{-15} \ c[/tex]

   The charge of the proton that makes up the nucleus is  [tex]Q_2 = \frac{12}{2} * 1.60 *10^{-19} =9.6*10^{-19} \ C[/tex]

    The energy to be impacted is  [tex]KE_f = 2.30 \ MeV = 2.30 *10^{6} \ eV = 2.30 *10^{6} * 1.60 *10^{-19} = 3.68*10^{-13} \ J[/tex]

Generally the radius of the nucleus is mathematically represented as

         [tex]r = \frac{d}{2}[/tex]

=>      [tex]r = \frac{5.50 *10^{-15}}{2}[/tex]

=>      [tex]r = 2.75 *10^{-15} \ m[/tex]

Generally from the law energy conservation we have that

     [tex]Initial \ total \ energy \ of the \ proton = final \ total \ energy \ of the \ proton[/tex]

i.e

    [tex]T_i = T_f[/tex]

Here

   [tex]T_i = KE_i + PE_i[/tex]

Here [tex]KE_i[/tex] is the initial kinetic energy which is mathematically represented as

       [tex]KE_I = \frac{1}{2} * m * u ^2[/tex]

Here  [tex]PE_i[/tex] is the initial potential energy of the proton and the value is  0 J given that the proton is moving

Also  [tex]T_f[/tex] is mathematically represented as

         [tex]T_f = KE_f + PE_f[/tex]

Here  

        [tex]PE_f[/tex]  is the final potential energy which is mathematically represented as

         [tex]PE_f = \frac{k * Q_1 * Q_2}{r}[/tex]

Here [tex]Q_1[/tex] is the charge on the proton with a value of [tex]Q_1 = 1.60 *10^{-19} \ C[/tex]

So

        [tex]PE_f = \frac{9*10^{9} *(1.60 *10^{-19} ) * ( 9.6 *10^{-19})}{ 2.75 *10^{-15}}[/tex]

=>     [tex]PE_f = 5.027 *10^{-13 } \ J[/tex]

So  

         [tex]KE_i + PE_i = KE_f + PE_f[/tex]

=>       [tex]\frac{1}{2} * m * u ^2 +0 = 3.68*10^{-13} + 5.027 *10^{-13 }[/tex]

Here m is the mass of the moving proton with value [tex]m = 1.67*10^{-27} \ kg[/tex]

So

       [tex]\frac{1}{2} * 1.67*10^{-27} * u ^2 +0 = 3.68*10^{-13} + 5.027 *10^{-13 }[/tex]

=>      [tex]u = \sqrt{\frac{3.68*10^{-13} + 5.027 *10^{-13 }}{0.5 * 1.67*10^{-27}} }[/tex]

=>       [tex]u = 3.23 *10^{7} \ m/s[/tex]

Answer: it’s actually C, electrical to magnetic

Explanation:

Answer:

F = 268 Hz

Explanation:

The beat frequency is given as:

[tex]Beat Frequency = |Frequency 1 - Frequency 2|\\[/tex]|

So, for the first flute and tuning fork:

[tex]20 Hz = |248 Hz - F|[/tex]

where,

F = Frequency of tuning fork

F = 248 Hz ± 20 Hz

F = 268 Hz (OR) 228 Hz

Now, for the second flute and tuning fork:

[tex]20 Hz = |288 Hz - F|[/tex]

where,

F = Frequency of tuning fork

F = 288 Hz ± 20 Hz

F = 268 Hz (OR) 308 Hz

Since, 268 Hz is common from both calculations. Therefore, it will be the frequency of the tuning fork.

F = 268 Hz

The acceleration of the object if the net force is decreased = 0.13 m/s²

Given

A net force of 0.8 N acting on a 1.5-kg mass.

The net force is decreased to 0.2 N

Required

The acceleration of the object if the net force is decreased

Solution

Newton's 2nd law :

[tex]\tt \sum F=m.a[/tex]

The mass used in state 1 and 2 remains the same, at 1.5 kg

ΣF=0.8 N

m=1.5 kg

The acceleration, a:

[tex]\tt a=\dfrac{\sum F}{m}\\\\a=\dfrac{0.8}{1.5}\\\\a=0.53`m/s^2[/tex]

ΣF=0.2 N

m=1.5 kg

The acceleration, a:

[tex]\tt a=\dfrac{\sum F}{m}\\\\a=\dfrac{0.2}{1.5}\\\\a=0.13~m/s^2[/tex]

Answer:

A spring scale shows a net force of 0.8 N acting on a 1.5-kg mass. What happens to the acceleration of the object if the net force is decreased to 0.2 N? A, The acceleration decreases to a quarter of its original value, or about 0.13 m/s².

Answer:

The frequency of the second harmonic ([tex]2f_o[/tex]) is 11.97 Hz.

Explanation:

Given;

mass of the string, m = 25 g = 0.025kg

tension on the string, T = 43 N

length of the string, L = 12 m

The speed of wave on the string is given as;

[tex]v = \sqrt{\frac{T}{\mu} }[/tex]

where;

μ is mass per unit length = 0.025 / 12 = 0.002083 kg/m

[tex]v = \sqrt{\frac{43}{0.002083} }\\\\v = 143.678 \ m/s[/tex]

The wavelength of the first harmonic wave is given as;

[tex]L = \frac{1}{2} \lambda _o\\\\\lambda _o = 2L \\\\\lambda _o = 2 \ \times \ 12\\\\\lambda _o = 24 \ m[/tex]

The frequency of the first harmonic is given as;

[tex]f_o = \frac{v}{\lambda _o} = \frac{v}{2L} = \frac{143.678}{24} = 5.99 \ Hz\\\\[/tex]

The wavelength of the second harmonic wave is given as;

[tex]L = \lambda_1 \\\\\lambda_1 = 12 \ m[/tex]

The frequency of the second harmonic is given as;

[tex]f_1 = \frac{v}{\lambda _1} = \frac{143.678}{12} = 11.97 \ Hz = 2(\frac{v}{\lambda _0}) = 2f_o[/tex]

Therefore, the frequency of the second harmonic ([tex]2f_o[/tex]) is 11.97 Hz.

Answer:

-15J

Explanation:

Step one:

given data

m1= 1.2kg

v1= 5 m/s

m2= 4.8kg

v2= 0 m/s

Required

The kinetic energy lost

Step two:

The kinetic energy before impact is KE1

[tex]KE1= 1/2mv^2\\\\KE1= 1/2*1.2*5^2\\\\KE1= 15J[/tex]

KE after impact is KE2

[tex]KE2= 1/2*(m1+m2)v2\\\\KE2= 1/2*(6)0\\\\KE2= 0 J[/tex]

The loss in Kinetic energy is

Loss in KE= KE2-KE1

Loss in KE= 0-15

Loss in KE= -15J

Answer:

True

Explanation:

When it's turn off, chemical energy is stored (the battery) in the flashlight, when it's turn on the chemical energy transfers into light and thermal energy.

Answer:

Explanation:

To convert Celsius to Fahrenheit, use the following formula;

= (°C * 9/5) + 32

= (453 * 9/5) + 32

= 847.4 °F

To convert Celsius to Kelvin, use the following;

= °C + 273.15

= 453 + 273.15

= 726.15K

Answer:

b. The force exerted by the piston on the object is less than F because the piston is accelerating downward.

Explanation:

Given that object exerts a downward force F on the piston that accelerates the piston downward.

An object can accelerate if the net force acting on it is non-zero.

Here, the piston is acceleration in the downward direction, so the net for on the piston is in the downward direction.

Force due to object, F, is in the downward direction while the force exerted by the piston on the object is in the upward direction.

As the acceleration of the piston is in the downward direction, so the downward force is more.

Therefore, the force exerted by the piston on the object is less than F because the piston is accelerating downward.

Hence, option (b) is correct.

Answer:

They can figure out when the person died, possibly the nature of crime, it can also detect if the body was moved in certain area.

Explanation:

Answer:

The ball needs approximately [tex]0.41\; \rm s[/tex] to reach that height for the first time.

Explanation:

The initial speed of the ball [tex]17.7\; \rm m \cdot s^{-1}[/tex]. However, what would be the initial vertical speed of this ball?

The angle of elevation is [tex]\theta = 49.8^\circ[/tex]. Consider the initial speed of this ball as the length of the hypotenuse of a right triangle. If the angle of elevation is one of the two acute angles of this triangle, the initial vertical speed of this ball would be the leg opposite to that angle.

[tex]\displaystyle \sin \theta = \frac{\text{opposite}}{\text{hypotenuse}}[/tex].

[tex]\displaystyle \sin \theta = \frac{v(\text{vertical, initial})}{v(\text{initial})}[/tex].

Therefore:

[tex]\begin{aligned}&v(\text{vertical, initial})\\ &= v(\text{initial}) \cdot \sin\theta \\ &= 17.7\; \rm m \cdot s^{-1} \times \sin \left(49.8^\circ\right) \approx 13.5\; \rm m \cdot s^{-1}\end{aligned}[/tex].

Let [tex]t[/tex] denote the time (in seconds) required for the ball to reach a height of [tex]4.7\; \rm m[/tex].

Let [tex]g[/tex] denote the acceleration because of gravity (typically [tex]g \approx 9.81\; \rm m \cdot s^{-2}[/tex] near the surface of the earth.) The height of the ball [tex]t[/tex] seconds after it was thrown would be: [tex]\displaystyle \frac{1}{2}\, g \cdot t^{2} + v(\text{vertical, initial}) \cdot t[/tex].

Assume that [tex]g \approx 9.81\; \rm m \cdot s^{-2}[/tex]. Set the value of this expression for height to [tex]4.7\; \rm m[/tex] and solve for [tex]t[/tex]:

[tex]\displaystyle \frac{1}{2} \times 9.81 \, t^{2} + 13.5 \, t = 4.7[/tex].

Either [tex]t \approx 0.41[/tex] or [tex]t \approx 2.3[/tex] will satisfy this equation. Both of these two values are reasonable. The first value for [tex]t[/tex] ([tex]0.41\; \rm s[/tex]) is the time required for the ball to reach a height of [tex]4.7\; \rm m[/tex] for the first time. The second value ([tex]2.3\; \rm s[/tex]) is the time required for the ball to come under that height on its way back to the ground. The question seems to be asking only for the first (the smaller one) of these two times.

Answer:

200N ;)

Explanation:

Answer:

200N

Explanation:

Explanation:

Yes, it is possible to have zero speed while accelerating, but only for a moment. ... acceleration is the rate at which the speed and direction of an object changes over time, so whenever an object goes through zero speed while reversing directions, it has non-acceleration. zero but a speed of zero.

Answer:

A. Force of friction

Explanation:

Find the diagram attached

From the diagram we can see that the force B is acting up on the body along the plane. This force is the force that prevents the body from sliding down the plane. Originally, the body on the line will tend to slide down the incline even without application of a force hence the reason of an opposing force that must act in the opposite direction is counter this motion to make the body be in a state of equilibrium. Hence the required force is force of friction since it is am opposing force acting in the direction opposite to the moving force acting on the body.

Answer:

You can determine if the ship is moving by lying down and measuring your height.

Explanation:

Answer:

v = [tex]\sqrt{2gh}[/tex]

the speed in the two planes will be the same since it does not depend on the angle of the same

Explanation:

In this exercise we are told that the two inclined planes have no friction force, so we can apply the conservation of energy for each one, we will assume that the initial height in the two planes is the same

starting point. Highest part of each plane

         Em₀ = U = m g h

final point. Lowest part of each plane

        [tex]Em_{f}[/tex] = K = ½ m v²

as there is no friction, the mechanical energy is preserved

          Em₀ = Em_{f}

          mg h = ½ m v²

          v = [tex]\sqrt{2gh}[/tex]

As we can see, the speed in the two planes will be the same since it does not depend on the angle of the same

Answer:

wish I could help

Explanation:

I been rereading this and I can't solve it lemme go ask people in ma house real quick

Answer:

Pulley = Flag Pole

Screw = Side latch

Wedge = Scissors

Wheel and axle = Car

Answer:

the no. of ejected electrons per second will increase.

Explanation:

In photoelectric effect, when a light is incident on a metal surface it ejects some electrons from the metal surface. The energy of photon of light must be equal to or greater than the work function of that metal. All the extra energy above the work potential appears as the kinetic energy of the ejected electrons. So, greater he energy of photon greater will be the kinetic energy of the ejected electrons.

A single photon interacts with a single electron and ejects it only if its energy is greater than work function. So, the increase in no. of photons per second means an increase in the intensity of laser beam. And greater no. of photons, will interact with greater no. of electrons. So, the no. of ejected electrons per second will increase.

Answer: no other source

Explanation:

The Earth gets energy from the sun which includes both heat and light and these are necessary for chemical reaction.

When the energy from the Sun gets to the Earth, they come as solar radiation and included in such solar radiation are infrared, invisible light, X-rays, ultraviolet light, radio waves, and gamma rays.

We should note that no other source is required for the Earth to get energy. The sun supplies it its energy.

Answer:

A symbol and a model are both examples of a representation because they are presented in place of the real thing.

Explanation:

A symbol is a sign, a letter, mark, token, figure, or image used to stand in place of an object, function, or process.  For example, co2 is used in Chemistry to represent carbon dioxide.  There are many symbols representing other objects or meanings.  Mathematically, we can state that "a" equals 40.  "a" is a symbol representing the numerical value "40." Similarly, a model is a representation of a structure or a person on a smaller scale.  For example, Architects produce models of buildings and other projects that they design.

Representation is a defined description or portrayal of any object, person, or anything.

The symbols and models are examples of representation.

Symbols are used as a representation in the form of signs, marks, or images to portray the object or anything. For instance, the symbols such as Ag and Au are used to represent Silver and Gold, respectively.

A model is also a structural or diagrammatical representation of a large object or structure. For example, architects build up maps and charts for the design of the building.

Thus, the symbols and models are used as representations for several things, items, structures, and many more.

To know more about representation, refer to the following link:

https://brainly.com/question/992922

Answer:

your answer is some

Explanation:

just so you know i took the test and i got an 80% on edge

Answer:

1. Photosynthesis releases oxygen gas as a product.

2. Subtracting cellular respiration from gross primary productivity

3. True

Explanation:

1. Photosynthesis is the process by which autotrophic organisms synthesize their food in form of sugars in the presence of sunlight. Photosynthetic process combines carbon dioxide (CO2) and water (H2O) to form glucose (C6H12O6) and oxygen gas as products. The equation is as follows:

6CO2 + 6H2O → C6H12O6 + 6O2

2. Net primary productivity, denoted by NPP, refers to the amount of biomass present in an ecosystem. It can be calculated by subtracting the amount of CO2 lost via cellular respiration from the amount produced called Gross primary productivity (GPP). That is;

NPP = GPP - cellular respiration

3. The process by which organic matter is synthesized from inorganic ones by organisms called AUTOTROPHS or PRIMARY PRODUCERS is called PRIMARY PRODUCTIVITY. Examples of autotrophic organisms are green plants, algae etc. Hence, in an ecosystem that have a high primary productivity, there would be a rapid rate of conversion of solar energy to biomass via PHOTOSYNTHESIS.

Answer:

D.

R increases

V is constant

I decreases

Explanation:

The resistance of a wire is given by the following formula:

[tex]R = \frac{(Resistivity)(L)}{A}[/tex]

It is clear from this formula that resistance is directly proportional to the length of wire. So, when length of wire is increased, the resistance of circuit increases.

The voltage in the circuit will be constant as the voltage source remains same and it is not changed.

Now, we can use Ohm Law:

V = IR

at constant V:

I ∝ 1/R

it means that current is inversely proportional to resistance. Hence, the increase of resistance causes the current in circuit to decrease.

Therefore, the correct option will be:

D.

R increases

V is constant

I decreases

Answer:

[tex]\frac{dV}{dt}= \frac{\pi d^2}{4}v[/tex]

Explanation:

The rate of volume flow out of tank can be expressed as:

[tex]\frac{dV}{dt} = A\frac{dL}{dt}[/tex]

where,

dV/dt = Volume flow rate

A = Cross-sectional area of outlet = πd²/4

d = diameter of circular outlet

dL = Displacement covered by water

dt = time taken

but we know that:

Velocity = υ = displacement/time = dL/dt

Substituting the values of "dL/dt" and "A" in the equation, we get:

[tex]\frac{dV}{dt} = \frac{\pi d^2}{4}v[/tex]

This is the expression for volume flow rate dV/dt, on terms pf v, d.

Answer:

[tex]\frac{W_{1}}{W_{2}} = 0.5[/tex]

Explanation:

The ratio of the weight of corn to the weight of water consumed will be the same. Either we compare the total weights for the total amount of corn or we compare only a small proportion of it. So, we consider the given 25 kg of corn. So, the mass of corn is given:

m₁ = mass of corn = 25 kg

Now, for mass of water, we will use its density:

ρ₂ = m₂/V₂

m₂ = ρ₂V₂

where,

m₂ = mass of water = ?

V₂ = Volume of water consumed by 25 kg corn = 20 m³

ρ₂ = density of water = 1000 kg/m³

Therefore,

m₂ = (1000 kg/m³)/(20 m³)

m₂ = 50 kg

Now, we calculate the ration:

[tex]\frac{Weight of Corn}{Weight of Water} = \frac{W_{1}}{W_{2}} = \frac{m_{1}g}{m_{2}g}[/tex]

[tex]\frac{W_{1}}{W_{2}}=\frac{m_{1}}{m_{2}} = \frac{25 kg}{50 kg}[/tex]

[tex]\frac{W_{1}}{W_{2}} = 0.5[/tex]

Answer:

which of the cars are speeding up: c

which of the cars or slowing down: a

which of the cars are maintaning a constant speed: b

Explanation:

Answer:

Explanation:

I gave a good enough explanation in your other posting. I'm sorry that I'm eating up your points.

The orange line is speeding up

The blue line is neither speeding up nor slowing down. It's speed is constant.

The green line is starting from 4 m/s and is slowing down to 0.

The diagram helps a lot. Thank you for that.

Answer:

Velocity Has vector Quantity