Answer:
Rutherford's gold foil experiment showed that the atom is mostly empty space with a tiny, dense, positively-charged nucleus. Based on these results, Rutherford proposed the nuclear model of the atom.
In the early 1900s, scientists thought that an atom consisted of a positive substance with negative charges scattered throughout the substance, but Rutherford explains that the positive charge is present at the center while the negative charges are present around it in the form of clouds.
What is the Rutherford gold foil experiment?There are various models that tried to explain the atomic model, and one of that Rutherford model is one in which he explains the model using the gold foil, which he then bombarded with the alpha particles. some of the particles that came back, while some passed through it by making some angles, and from this he concluded that the positive charge remains in the center while the negative is displaced.
Hence, in the early 1900s, scientists thought that an atom consisted of a positive substance with negative charges scattered throughout the substance, but Rutherford explains that the positive charge is present at the center while the negative charges are present around it in the form of clouds.
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Which region is located between 60-90N and 60-90S?
Group of answer choices
Tropics
Tropical Rainforest
Polar
Mid-Lats
Answer:
Polar
Explanation:
Took the test
Now write a short paragraph comparing "fast" to "speeding up quickly" and "slow" to "speeding up slowly".
Answer:ok yes
Explanation:yes of course
the pilot of a new stealth helicopter which has a mass of 15000 kg and was traveling 180 m / s accelerated to 250 m / s in six seconds to make sure he could rescue those in need how much force was used to accelerate the helicopter and what was the helicopters final momentum
Answer:
pf = 3750000 kg.m/s
F = 175000 N
Explanation:
Constant Acceleration
An object moves with constant acceleration if its velocity changes uniformly in time.
If we call vo to the initial speed, vf the final speed, and t the time, then the acceleration is calculated as:
[tex]\displaystyle a=\frac{v_f-v_o}{t}[/tex]
The new stealth helicopter was traveling at vo=180m/s and changed to vf=250 m/s in t=6 seconds, thus the acceleration was:
[tex]\displaystyle a=\frac{250-180}{6}[/tex]
[tex]a=11.67~m/s^2[/tex]
Please note this number is shown rounded to the nearest hundredth, but it was stored in the calculator's memory with full precision. This fact affects the next calculation as will be noted below.
The acceleration must be produced for some net force that can be calculated by:
F = m.a
Where m=15000 Kg is the mass of the helicopter. Thus:
F = 15000 * 11.67
F = 175000 N
The above product would lead to the inaccurate result of 175050 if the acceleration would have not used with its full representation in the calculator's memory.
The momentum of an object of mass m and velocity v is:
p = m. v
The final momentum of the helicopter is:
pf = m.vf = 15000*250 m/s
pf = 3750000 kg.m/s
Note: When performing calculations over intermediate results, it's important to keep them as accurate as possible to preserve the accuracy of the final result.
A film of soapy water ( n= 1.33 ) on top of a plastic cutting board has a thickness of 233 nm. What color is most strongly reflected if it is illuminated perpendicular to its surface?
Answer:
620nm
Explanation:
According to the question,
Refractive index, n = 1.33Thickness, t = 233 nmAs we know,
→ [tex]t = \frac{\lambda}{2n}[/tex]
or,
→ [tex]\lambda = 2tn[/tex]
By putting the values, we get
[tex]= 2\times 233\times 10^{-9}\times 1.33[/tex]
[tex]= 620 \ nm[/tex]
Thus the above response is correct.
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5. A man has a weight of 100 Newtons. How much work is done if he climbs 4 meters up a ladder? Plug numbers under the equation. Solve and circle your answer. Include the proper units.
Answer:
400 JExplanation:
The work done by an object can be found by using the formula
workdone = force × distance
From the question we have
workdone = 100 × 4
We have the final answer as
400 JHope this helps you
The earth rotates every 86,160 seconds. What is the tangential speed (in m/s) at Livermore (Latitude 37.6819° measured up from equator, Longitude 121.
Answer:
The tangential speed at Livermore is approximately 284.001 meters per second.
Explanation:
Let suppose that the Earth rotates at constant speed, the tangential speed ([tex]v[/tex]), measured in meters per second, at Livermore (37.6819º N, 121º W) is determined by the following expression:
[tex]v = \left(\frac{2\pi}{\Delta t}\right)\cdot R \cdot \sin \phi[/tex] (1)
Where:
[tex]\Delta t[/tex] - Rotation time, measured in seconds.
[tex]R[/tex] - Radius of the Earth, measured in meters.
[tex]\phi[/tex] - Latitude of the city above the Equator, measured in sexagesimal degrees.
If we know that [tex]\Delta t = 86160\,s[/tex], [tex]R = 6.371\times 10^{6}\,m[/tex] and [tex]\phi = 37.6819^{\circ}[/tex], then the tangential speed at Livermore is:
[tex]v = \left(\frac{2\pi}{86160\,s} \right)\cdot (6.371\times 10^{6}\,m)\cdot \sin 37.6819^{\circ}[/tex]
[tex]v\approx 284.001\,\frac{m}{s}[/tex]
The tangential speed at Livermore is approximately 284.001 meters per second.
A small apple weighs 0.8N. How much would an apple that is 4 times as massive weigh?
Answer:
W=31.99 N
Explanation:
W= 8 N (N= kg*m/ s^2)
W= m* g
8 N= m * 9.8 m/s^2
m= 0.816 kg
m*4= (0.816)4
= 3.264 kg
W= mg
= (3.264 kg)(9.8 m/s^2)
W=31.99 N
I'm not quite sure how the formula works. I thought it was
55*6*9.81 = N
Weight * acceleration * gravity = N
My answer was wrong. Could anyone help me understand this question, please?
"When landing after a spectacular somersault, a 55.0 kg gymnast decelerates by pushing straight down on the mat. Calculate the force (in N) she must exert if her deceleration is 6.00 times the acceleration of gravity."
Answer:
See the explanation below.
Explanation:
Of course yes, after my explanation you will understand very well how to analyze this type of problems.
First, we must differentiate the weight of the mass, the mass has units of kilograms or pounds, while the weight is the product of the mass by gravitational acceleration. In this way, we have the following formula for the weight of anybody.
w = m*g
where:
w = weight [N] (units of Newtons]
m = mass [kg]
g = gravity acceleration = 9.81 [m/s²]
When we have the product of these units [kg]*[m/s²], We are always going to get as a result the units of Newtons [N], The Newton is a unit of force.
Now, to solve this problem we must use Newton's second law, which tells us that the sum of forces on a body must be equal to the product of mass by acceleration.
ΣF = m*a
where:
ΣF = forces acting over the gymnast [N]
m = mass = 55 [kg]
a = desacceleration = 6*9.81 = 58.86 [m/²]
Now we have two forces acting over the gymnast the first one is his or her weight (the mass by the gravity acceleration) and the second force is the one made it by his or her legs upwards in order to be standing. Let's take as positive signs the movements and forces upwards and negative downwards
- (m*g) + Fl = m*a
where:
Fl = force made it by the legs [N]
As the deceleration is upward because it prevents the person from continuing to go down, it is taken as a positive sign.
- (55*9.81) + Fl = (55*58.86)
Fl = (55*58.86) + (55*9.81)
Fl = 3776.85 [N]
I hope you can understand :)
Which describes an interaction in which organisms work together so that all organisms in the group benefit? cooperation parasitism commensalism competition
Answer:
Cooperation
Explanation:
Cooperation: Both organisms benefit in the relationship.
Parasitism: One organism benefits and the other is harmed in this relationship.
Commensalism: One organism benefits, while the other neither benefits of is harmed.
Competition: Organisms compete for resources.
The option that describes an interaction in which organisms work together so that all organisms in the group benefit is known as Cooperation.
What is Species interaction?Species interaction may be defined as a type of process through which the population of one species interacts with the population of other species that significantly lives in the same locality. This process either benefits or harm the population.
The categories of species interaction are as follows:
Cooperation: It is a type of +,+ interaction where both organisms benefit in the relationship. This is also known as mutualism. Parasitism: It is a type of +,- interaction where one organism benefits and the other is harmed. Commensalism: It is a type of +,0 interaction where one organism benefits, while the other neither benefits nor is harmed.Competition: It is a type of -,- interaction where both organisms are harmed and compete for the same resources.Therefore, the option that describes an interaction in which organisms work together so that all organisms in the group benefit is known as Cooperation.
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Which factor is related to seat belt use in teens?
A.Speed limit on roadways
B.Type of vehicle
C.Alcohol use
D.Weather conditions
Answer:
Explanation:
C
Answer:
Explanation:
Alcohol use C
A Young's double-slit experiment is performed using light that has a wavelength of 631 nm. The separation between the slits is 5.25E-5 m. Calculate the angle that locates the first-order bright fringes on the screen.
Answer:
θ = 1.21 10⁻² rad
Explanation:
The double slit experiment is described for constructive interference
d sin θ = m λ
where d is the separation between the slits, λ the wavelength used, m a stereo that represents the order of interference
The first order of interference corresponds to m = 1 and the separation of the slits is d = 5.2 10⁻⁵ m
sin θ = m λ / d
θ = sin⁻¹ (m λ / d)
let's calculate
θ = sin⁻¹ (1 631 10⁻⁹ / 5.2 10⁻⁵)
θ = 1.21 10⁻² rad
A loop of radius r = 3.0 cm is placed parallel to the xy-plane in a uniform magnetic fieldB= 0.75 Tˆk. The resistance of the loop is 18 Ω. Starting at t = 0, the magnitude of thefield decreases uniformly to zero in 0.15 seconds. What is the magnitude of the electric currentproduced in the loop during that time?
This question is incomplete, the complete question is;
A loop of radius r = 3.0 cm is placed parallel to the xy-plane in a uniform magnetic field B = 0.75 Tˆk.
The resistance of the loop is 18 Ω. Starting at t = 0, the magnitude of the field decreases uniformly to zero in 0.15 seconds.
What is the magnitude of the electric current produced in the loop during that time?
Answer
a 2.1 mA
b 0.79 mA
c 1.7 mA
d 0.20 mA
e 3.9 mA
Answer: option (b) 0.79 mA is the correct answer
Explanation:
Given that;
radius r = 3 cm = 0.03 m
Magnetic field B = 0.75
Resistance R = 18
time t = 0.15s
Area A = πr² = π(0.03)² = 0.002827 m²
we know that
Induced EMF ∈ = -BA / T
and ∈ is also = IR
so, IR = -BA/t
I = -BA / Rt
we substitute our values into the equation
I = [- (-0.75 × 0.002827)] / [18 × 0.15]
= 0.002120 / 2.7
= 0.0007851 A ≈ 0.00079 A ≈ 0.79 mA ( milliamperes )
Therefore option (b) 0.79 mA is the correct answer
2 A car rounding a bend travels in an arc of a circle.
a What provides the centripetal force?
b Is a larger or a smaller centripetal force required if
(i) the car travels faster,
(ii) the bend is less curved,
(iii) the car has more passengers?
Answer:
a) the centripetal force causing the cat to turn in a circular path is due to friction between the car's tyres and the surface of the road.
b)
1) a larger centripetal force is required if the car travels faster
2) a larger centripetal force is needed when the bend is less curved.
3) when a car has more passengers, the mass of the car increases, therefore, a larger force is required to move the car.
Explanation:
The friction between the car's tire and the surface provides centripetal force and if the car travels faster, the bend is curved, or the car has more passengers it requires a larger centripetal force.
What is Centripetal force?When an object is moving in a curve path then a force is acting radically in the object this force is called centripetal force, this force helps to maintain the object in the curve e.g. if a car is moving in a well, so the centripetal force is responsible, so the car is not falling. The SI unit used to represent centripetal force is Newton.
A. The friction between the car's tire and the curve surface is responsible for providing the centripetal force, and it also depends on the car's speed.
B. If a car is traveling faster than a larger centripetal force is required to maintain the curve path of the car, means if the friction between the tire and surface decreases the centripetal force also decreases.
When the bend is less curved, the radius of the curve increase and thus require more centripetal force.
When people in the car increase then the mass of the car also increases so due to this the gravitation force is now more on the car so more centripetal force I required to maintain the curve path of the car.
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I need the answer asap thank you !!!
Answer:
whats the question??????
What is the approximate efficiency of the engine?
A heat engine has a temperature of 1800 K. Some of the
heat from the engine flows to the surroundings, which
are at a temperature of 160 K.
0 16%
O 91%
O 103%
O 109%
Answer:91% I think
Explanation:
The typical engine efficiency for a modern petrol combustion engine is from 20 to 30 percent. The remaining 70 to 80 percent of the heat energy of the petrol is released from the engine as friction loss, mechanical sound energy, or exhaust heat. Thus, option B is correct.
What approximate efficiency of the engine?An engine's efficiency is measured by the heat produced divided by the amount of useful work done. Is the task complete. Is the task finished. Please be aware that the phrase “work done” refers to the force applied to the clutch or driveshaft.
Utilizing the following formula, efficiency may be represented as a ratio: output input. Output, often called work output, is the entire quantity of productive work completed, excluding waste and spoilage.
You may determine the efficiency by figuring out what proportion of the energy input results in the desired output: Efficiency is defined as Energy Out/Energy In 100%.
Therefore, This implies that the work produced by thermodynamic expansion is reduced by the friction and other losses.
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in the one pulley system when you move the Mass from The 20-centimeter Mark to the 15 centimeter mark it moves to my 5cm how far did you pull the string?
5 cm
10cm
15cm
20cm
Answer:
5 cm
Explanation:
Remember that in the pulley system the rope moves the same distance in both ends of the pulley, what the pulley system does is creating a mechanical advantage which basically means that it takes less effort to pull than the actual effort it would take, so for example if you have to lift a box that is 800 N, with a pulley system and the mechanical advantage you'd have to pull with less force.
A 56 kg woman climbs the stairs to a height of 5 m. Determine: a) what mechanical work
she performed; b) what work the woman will do when climbing the stairs and carrying a 5 kg load.
Answer:
a) W = 2746.8[J]
b) W = 2992.05 [J]
Explanation:
Work is defined as the product of force by distance. We must bear in mind that the force that performs the work is the one that acts in the same direction of displacement.
For this case, we must calculate the weight of the woman, the weight is defined as the product of mass by gravity.
[tex]w=m*g\\[/tex]
where:
w = weight [N] (units of Newtons]
m = mass = 56 [kg]
g = gravity acceleration = 9.81 [m/s²]
[tex]w=56*9.81\\w=549.36[N][/tex]
a)
[tex]W=F*d[/tex]
where:
F = weight = 549.36[N]
d = distance = 5 [m]
[tex]W = 549.36*5\\W = 2746.8[J][/tex]
b)
The new mass will be the combination of the mass of the woman plus that of the load.
[tex]m_{new} = 56+5\\m_{new}=61[kg][/tex]
[tex]w_{new}=61*9.81\\w_{new}=598.41[N][/tex]
The new work done.
[tex]W =598.41*5\\W=2992.05[J][/tex]
How should the student change the circuit to give negative values for current and
potential difference?
Answer:
Reversing the polarity of the battery reverses the polarity in the circuit.
Explanation:
In a DC circuit, the polarity of the potential difference and the current is determined by the polarity of the battery or the power source.
Reversing the polarity of the battery reverses the polarity in the circuit.
In the case of current, the direction of the movement of the electrons is reversed and in the case of the potential difference, this is measured with respect to a minimum fly in general taken as zero.
From the 1780s to the late 1800s, people thought the amount of land and resources in the West was limited
Answer:true
Explanation:
One particle has mass m and a second particle has mass 2m. The second particle is moving with speed v and the first with speed 2v. How do their kinetic energies compare?
Answer:
Explanation:
The formula for kinetic energy to be used here is 1/2mv².
If the first particle is "particle a" and the second particle is "particle n"; there kinetic energies (K.E) will be
K.Eₐ = 1/2.m2v² = mv²
K.Eₙ = 1/2.2mv² = mv²
From the above, it can be said that there kinetic energies are the same.
NOTE that the m and v used in the question means mass and velocity respectively.
A dog walks 24 steps north and then walks 55 steps west to bury a bone. If the dog walks back to the starting point in a straight line, how many steps will the dog take and in which direction will the dog walk? On paper, use the graphical method to find the magnitude of the net displacement.
Answer:
The dog should walk 60 steps to the southeast to return to its starting point.
Explanation:
To solve the present mathematical problem, we must use the Pythagorean theorem. This establishes that in right triangles the sum of their squared legs is equal to the hypotenuse squared, that is:
A ^ 2 + B ^ 2 = X ^ 2
Thus, in the case, the calculation would be the following:
24 ^ 2 + 55 ^ 2 = X ^ 2
576 + 3,025 = X ^ 2
√3,601 = X
60 = X
Therefore, the dog should walk 60 steps to the southeast to return to its starting point.
will mark brainliest
On a weather map, what does the symbol shown below represent?
A circle is shown with a vertical diameter drawn. The top right quadrant is shaded.
Cloud cover
Flurries
Snow
Wind speed
The blue line with triangles are a cold front. The red line with half circles are a warm front. The black H is high pressure. The black L is low pressure. The black dot is overcast skies. Finally the white circle with a line down and 4 lines off of that line is 40-knot wind
idk and dont understand
Answer:
Wind speed.
Explanation:
I took the test and I promise this is right.
These systems help warn drivers when they deviate from their intended path of travel,
a)
Drowsiness alert systems
Lane departure warning systems
c) Electronic stability control systems
Adaptive cruise control systems
Answer:
lane departure warnings
Explanation:
Can you make predictions about what will happen in a crash when
you know the object's momentuo?
LAB SCIENCE
A toy rocket is launched straight up by using a spring. The rocket is initially pressed down on the spring so that the spring is compressed by 9 cm. If the spring constant is 830 N/m and the mass of the rocket is 50 g, how high will the rocket fly?
Answer:
6.86 meters
Explanation:
Let the compression of the string be represented by x, and the height of projection of the toy rocket be represented by h.
So that;
x = 9 cm = 0.09 m
In its rest position (i.e before the launch), the spring has a stored potential energy which is given as;
PE = [tex]\frac{1}{2}[/tex] K[tex]x^{2}[/tex]
= [tex]\frac{1}{2}[/tex] x 830 x [tex](0.09)^{2}[/tex]
= 415 x 0.0081
= 3.3615
The potential energy in the string = 3.36 Joules
Also,
PE = mgh
where: m is the mass, g is the gravitational force and h the height.
m = 50 g = 0.05 kg, g = 9.8 m[tex]s^{-2}[/tex]
Thus,
PE = 0.05 x 9.8 x h
3.3615 = 0.05 x 9.8 x h
3.3615 = 0.49h
⇒ h = [tex]\frac{3.3615}{0.49}[/tex]
= 6.8602
The height of the toy rocket would be 6.86 meters.
Freida wants to model the way atoms move when a substance changes its state. To do this, Freida makes a pyramid of marshmallows. Then, she knocked down the pyramid causing the marshmallows to fall. If the marshmallows represent the atoms in the substance, which change of state is Freida modeling?
Answer:melting 2020 edge
Explanation:
:)
Answer:
Melting
Explanation:
How much energy is transported across a 1.25 cm2 area per hour by an EM wave whose E field has an rms strength of 38.5 mV/m
Answer:
The energy transported per hour is 4.92 x 10⁻¹⁰ J.
Explanation:
Given;
root mean square strength of the field, [tex]E_{rms}[/tex] = 38.5 mV/m
area per hour, A = 1.25 cm²/hr = 1.25 x 10⁻⁴ m²/hr
The peak strength of the field is given by;
E₀ = [tex]E_{rms}[/tex]√2
E₀ = (38.5 mV)√2
E₀ = 54.45 mV
the average intensity is given by;
[tex]I_{avg} = \frac{c\epsilon E_o^2}{2}\\\\ I_{avg} = \frac{(3*10^8)(8.85*10^{-12})(54.45*10^{-3})^2}{2}\\\\I_{avg} = 3.936*10^{-6} \ W/m^2[/tex]
Energy transported per hour is given by;
[tex]E = \frac{P}{t} = \frac{I*A}{t} = (\frac{A}{t})(I)\\\\E = (1.25*10^{-4} \ \frac{m^2}{hr} )(3.936*10^{-6} \ \frac{W}{m^2} )\\\\E = 4.92*10^{-10} \ J[/tex]
Therefore, the energy transported per hour is 4.92 x 10⁻¹⁰ J.
When Danny Diver who weighs 500 N steps off a diving board 10 m above the water, he hits the water with kinetic energy of
Answer:
5000 J
Explanation:
Given that,
Weight of Danny Diver, F = 500 N
He steps off a diving board 10 m above the water
We need to find the kinetic energy of the water with which it hits. Let its is K. It is given by :
E = mgh
Where g is acceleration due to gravity
[tex]E=500\ N\times 10\ m\\\\=5000\ J[/tex]
So, he hits the water with kinetic energy of 5000 J.
Each mass in the figure is 3 kg. Find the magnitude and direction of the net gravitational force on mass A due to the other masses.
A. 2.45 × 10–7 N toward B
B. 3.75 × 10–7 N toward C
C. 2.00 × 10–7 N toward D
D. 1.15 × 10–7 N toward D
Answer:
THE ANSER IS B
Explanation:
The magnitude and direction of the net gravitational force on mass A due to the other masses is 1.15 × 10⁻⁷ N toward D.
The gravitational force between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between them. In this case, all of the masses are equal to 3 kg, and the distance between mass A and mass D is 3 m.
The gravitational force between mass A and mass D is therefore:
F = G * m_A * m_D / r²
= 6.674 × 10⁻¹¹ N m² / kg² * 3 kg * 3 kg / 3 m²
= 1.15 × 10⁻⁷ N
The direction of the gravitational force is towards mass D.
Therefore, the net gravitational force on mass A due to the other masses is 1.15 × 10⁻⁷ N toward D.
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What are the sources of error in photoelectric effect experiment?
Answer:
In this experiment the major sources of error were due many different factors, some of which included: restraints on the Voltage sensor, restraints on the actual apparatus, and faulty averages of the stopping potential.
Explanation:
The main sources of error in this experiment were caused by a variety of variables, including restrictions on the Voltage sensor, restrictions on the actual device, and inaccurate averages of the stopping potential.
What is the Photoelectric effect?When a substance absorbs electromagnetic radiation, a phenomenon known as the photoelectric effect causes electrically charged particles to be discharged from or within the material. When light strikes a metal plate, the action is frequently described as the ejection of electrons from the plate. In a more general definition, the substance may be solid, liquid, or gas, the radiant energy may take the form of infrared, visible, or ultraviolet light, X-rays, or gamma rays, and the discharged particles may include ions (electrically charged atoms or molecules) in addition to electrons.
Because of the perplexing concerns, it presented about the nature of light—particle versus wavelike behavior—that were finally answered by Albert Einstein in 1905, the phenomenon was critically important in the development of modern physics.
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