Can someone answer these please?
9. Force = mass * acceleration.
F = ma
(8) = (1)a
8m/s^2 = a
10. First solve for the kinetic energy of the vehicle:
Kinetic energy = (1/2)mass * velocity^2
KE = (1/2)(1200)(2)^2
KE = 2400J
Now use this value in the equation for work:
Since the car comes to a halt, the work is equal to the kinetic energy.
Work = Force * Displacement
W = Fd
(2400) = F(0.15) Remember to convert cm to m
1.6*10^4 N = F
9.
The 1N = 1kg * 1 m/s^2 has no influence on the answer.
F = 8 N
m = 1 kg
a = ??
F = m * a
8N = 1 kg * a
8N/1kg = a
a = 8 m/s^2
10
This is the beginning of a 2 step process. You are back to the basic 4 equations to find the acceleration. Then you can use F = ma
Givens
m = 1200 kg
vi = 2m/s
vf = 0
d = 15 cm = 0.15 m
Formula
F = m*a
vf^2 = vi^2 + 2 * a * d
0 = 2^2 + 2 * a * 0.15,
0 = 4 + 0.3 * a
- 4 = 0.3 * a
- 4 / 0.3 = a
- 13.3333333 = a
F = m * a
F = 1200 * (- 13.3333333)
F = - 16000 N
Comment (Extremely Important)
Why aren't any of the answers minus? It is because the minus represents the amount of force needed to stop the vehicle. But the question asks you about the rock. What is the rock experiencing? The rock is opposing the 0.15 m so the force it offers is in the opposite direction to that exerted by the vehicle.
f a wave has a wavelength of 9 meters and a period of 0.006, what is the velocity of the wave? A. 1,200 m/s B. 1,500 m/s C. 1,800 m/s D. 1,285 m/s
Answer: 1500 m/sec. ( b )
Solution:
V= f (λ)
Speed = frequency. Wavelength
And frequency = 1/time period
First we will find the frequency :
Frequency = 1/time period
1/0.006 = 166.67 Hz
Using this in the equation:
Speed = frequency. Wavelength
V= f (λ)
9 × 166.67
= 1500.03 ≈ 1500
V (Speed) = 1500 m/s.
Note: Do not forget to mention the units or otherwise they may cost you marks!
Answer:
B
Explanation:
When sugar is burned, water vapor and carbon dioxide are produced. A sugar molecule has a specific number of carbon, hydrogen, and oxygen atoms. Use the balanced chemical equation to identify the number of carbon, hydrogen, and oxygen atoms in sugar. Sugar + 12O2 ? 11H2O + 12CO2
Answer:
Number of carbon, hydrogen, and oxygen atoms in sugar:
C: 12H: 22O: 11Explanation:
1) Given balanced chemical equation:
Sugar(s) + 12O₂(g) → 11H₂O(g) + 12CO₂(g)2) Mass conservation law: in a chemical reaction, the atoms are not created nor destroyed; they recombine to form new substances, so the number of atoms of each kind in the reactants is equal to the number of atoms of the same kind in the products.
3) Balance.
-----------------------------------------------------------------------------------------------------
Atom Products = Reactants
-----------------------------------------------------------------------------------------------------
C 12CO₂ ⇒ 12 = 12 in sugar
-----------------------------------------------------------------------------------------------------
H 11H₂O ⇒ 11 × 2 = 22 = 22 in sugar
-----------------------------------------------------------------------------------------------------
O 12CO₂ ⇒ 12 × 2 = 24 12 × 2 = 24 in O₂ + x in sugar
11H₂O ⇒ 11
----------------------------- --------------------------------------------------
24 + 11 = 35 = 24 + x
----------------------------------------------------------------------------------------------------
Solve for x: 35 = 24 + x ⇒ x = 35 - 24 = 11 ∴ 11 O atoms in sugar
Conclusion:
Number of carbon, hydrogen, and oxygen atoms in sugar:
C: 12H: 22O: 11a toy friction car is propelled forward from rest by a girl's hand which causes it to reach a forward velocity of 3.5m/s in 0.4 seconds. it is then rreleased and later stops in 5.6 seconds.
a) what is the acceleration with which the car speeded up?
b)what is the acceleration with which the car slowed down?
c) how far did the toy car travel?
Answer:
a) Acceleration = [tex]8.75m/s^2[/tex]
b) Slow down acceleration = 0.625[tex]m/s^2[/tex]
c) Car travels 9.8 m
Explanation:
Acceleration = Change in velocity/Time
a) Change in velocity = 3.5-0 = 3.5 m/s
Time = 0.4 seconds
Acceleration = [tex]3.5/0.4=8.75m/s^2[/tex]
b) Change in velocity = 0 - 3.5 = -3.5 m/s
Time = 5.6 seconds
Acceleration = [tex]-3.5/5.6=-0.625m/s^2[/tex]
Slow down acceleration = 0.625[tex]m/s^2[/tex]
c) We have equation of motion, [tex]v^2=u^2+2as[/tex], where u is the initial velocity, u is the final velocity, s is the displacement and a is the acceleration.
Here v = 0 m/s, u = 3.5 m/s, a = -0.625[tex]m/s^2[/tex]
Substituting
[tex]0^2=3.5^2-2*0.625*s\\ \\ s=9.8m[/tex]
So, car travels 9.8 m
Which is an example of the conversion of gravitational potential energy into kinetic energy?
a falling rain drop may be an example.
Answer:
When a ball is dropped from some height from rest then while its motion under gravity its initial gravitational potential energy converts into kinetic energy
Explanation:
When ball is placed at some height "h" above the floor at rest then initial gravitational potential energy is given as
[tex]U = mgh[/tex]
here we know
m = mass of the ball
g = acceleration due to gravity
h = height of the ball
now when ball is dropped from this height then its initial potential energy will convert into kinetic energy.
so speed of ball at some instant of time is given as
[tex]\frac{1}{2} mv^2 = mgh[/tex]
[tex]v = \sqrt{2gh}[/tex]
so here in this case gravitational potential energy will convert into kinetic energy of ball
According to a simplified model of a mammalian heart, at each pulse approximately 20 g of blood is accelerated from 0.20 m/s to 0.32 m/s during a period of 0.08 s . What is the magnitude of the force exerted by the heart muscle?
Answer:
Magnitude of the force exerted by the heart muscle = 0.03 N
Explanation:
We have force = mass * acceleration
Acceleration = Rate of change of velocity = Change in velocity/time = (0.32-0.20)/0.08
= 0.12/0.08 = 12/8 = 1.5 [tex]m/s^2[/tex]
Mass of blood = 20 g = 20/1000 kg = 0.02 kg
Magnitude of the force exerted by heart muscle = 0.02*1.5 = 0.03 N
The magnitude of the force exerted by the heart muscle is 0.03 N.
From Newton's second law, we know that F = ma
Where;
F = force
m = mass of the body
a = acceleration
Now we must find the acceleration from:
a = v - u/t
a = acceleration
v = final velocity
u = initial veocity
t = time taken
Substituting values;
a = 0.32 m/s - 0.20 m/s/ 0.08 s
a = 1.5 m/s^2
Since F = ma
But m was given in grams and we must convert to kilograms so m = 0.002 Kg
Therefore;
F = 0.002 Kg × 1.5 m/s^2
F = 0.03 N
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Kat is creating a model to show how plate movements are linked to the formation of new rocks, and she is trying to place the steps in the correct order. Which step comes first?
The tectonic plates move apart from one another
Lava flows onto Earth's surface
magma forms beneath the plates and rises up through the cracks
Lava cools and hardens to form igneous rock
Igneous Rocks are rocks that are made from magma (molten lava). The correct order of the Igneous Rock formation is ACBD.
Igneous Rock:These are the rocks made from magma (molten lava). The magma form in the upper mantle and lower crust because of very high temperature.
These rocks form,
Movement of a tectonic plate.The magma inside the crust rises from the cracks.Lava flows on the surface of the earth.When lava cools and crystallizes, it forms igneous rocks.Therefore, the correct order of the Igneous Rock formation is ACBD.
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Convenience sampling can be produce biased research results. True or false?
True is your answer.
Hope this helps....
The acceleration due to gravity on the moon is 1.6 m/s2, about a sixth that of Earth’s. Which accurately describes the weight of an object on the moon? An object on the moon is 1/6 times lighter than on Earth. An object on the moon is 1/6 times heavier than on Earth. An object on the moon is six times lighter than on Earth. An object on the moon is six times heavier than on Earth.
The answer is C.
An object on the moon is six times lighter than on Earth.
The statement accurately describes the weight of an object on the moon is An object on the moon is 1/6 times lighter than on Earth.
What is weight?The weight is the product of mass of the object and acceleration due to gravity on the specific planet.
When the acceleration due to gravity is less, the weight measured will be less. The acceleration due to gravity on the moon is 1.6 m/s2, about a sixth that of Earth’s.
Thus, an object on the moon is 1/6 times lighter than on Earth.
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The elements that do not ordinarily form compounds are
The noble gasses, they are the elements on group 18 of the periodic table and do not usually form compounds. The noble gases are as follows: helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and oganesson (Og).
Hope this helped :)
The elements that do not ordinarily form compounds are the noble gases. These gases are found in Group 18 of the periodic table and include helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn).
What is Noble gases ?Noble gases are extremely stable and inert, which means that under typical circumstances, they do not typically combine with other elements to produce compounds.
They are chemically stable because they have an entire outer electron shell. They are less likely to gain, lose, or share electrons with other atoms due to their entire outer electron shells, which is crucial for the formation of compounds.
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Which scientist first discovered the white light is a mixture of a rainbow spectrum of light rays
Issac Newton
In the 17th century, Isaac Newton discovered that prisms could disassemble and reassemble white light, and described the phenomenon in his book Opticks. He was the first to use the word spectrum (Latin for "appearance" or "apparition") in this sense in print in 1671 in describing his experiments in optics.
Isaac Newton first discovered that white light is actually a mixture of different colored light rays, together forming the visible spectrum of a rainbow. therefore, option c is correct
Explanation:The scientist who first discovered that white light is a mixture of a rainbow spectrum of light rays is Isaac Newton. In the seventeenth century, Newton performed experiments with lenses and prisms and was able to demonstrate that white light consists of the individual colors of the rainbow combined together. He conducted an experiment in which he allowed sunlight to pass through a small hole and then through a prism. Newton found that sunlight, which looks white to our eyes, is actually made up of a mixture of all the colors of the rainbow.
Newton explained his optics findings in terms of a "corpuscular" view of light, in which light was composed of streams of extremely tiny particles traveling at high speeds according to Newton's laws of motion. This view was later complemented by the wave theory of light when Thomas Young demonstrated the interference patterns, reconciling the particle and wave models of light into a more comprehensive dual theory known as the wave-particle duality.
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The complete Question is given below:
Which scientist first discovered that white light is a mixture of a rainbow spectrum of light rays?
a.James Watt
b.Marie Curie
c.Isaac Newton
d.Benjamin Franklin
e.Galileo Galilei
The color of a substance is a physical property. Please select the best answer from the choices provided T F
Answer:
True
Explanation:
Color is the splitting of light into different spectra. Light, by nature, is monochromatic. This means that it has one wave length. The prism experiment has proved that light has many colors. About 7 colors have been discovered.
The colors simply denote the different wavelengths of the "monochromatic" light. The colors are the different wavelengths of light when it is split.
The eye, sees color as a reflection. In the electron sense, color is as a result o electrons being "excited" or promoted from a lower orbital to a higher energy orbital.
Which electron dot diagram shows the bonding between 2 chlorine atoms? Image for option 1 Image for option 2 Image for option 3 Image for option 4
Answer:
B
Explanation:
Edge 2020
A child and her mother are at the park. The child walks around the rectangular park while her mom waits on a bench. The child returns to the bench, finishing her walk at the same place she started. The park is 411 meters wide and 475 meters long. What distance did the child walk? 195,000 m 886 m 1,772 m 0 m
the correct answer is 0
The child walked a total distance of 1772 meters, which is the perimeter of the rectangular park measured by adding together twice the length and twice the width of the park.
To find out the distance the child walked around the rectangular park, we calculate the perimeter of the rectangle. The park is mentioned to be 411 meters wide and 475 meters long. To compute the perimeter, we add the length of all four sides of the rectangle together:
Perimeter of rectangle = 2( length) + 2(width)
Perimeter of the park = 2(475 m) + 2(411 m)
Perimeter of the park = 950 m + 822 m
Perimeter of the park = 1772 m
Therefore, the child walked a total distance equal to the perimeter of the park which is 1772 meters.
Three charges are located at the vertices of a triangle, as shown.
Which vector best represents the net force acting on the +4 C charge in the diagram?
A) W
B) X
C) Y
D) Z
The vector best represents the net force acting on the +4 C charge in the diagram is X. The correct option is B.
What is vector?A vector is the representation of a physical quantity in magnitude and direction.
A vector incline at an angle in has two components. On in x direction and other is in y direction.
Three charges are located at the vertices of a triangle, as shown.
The vector best represents the net force acting on the +4 C charge in the diagram is X.
Thus, the correct option is B.
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two strong permanent magnets are placed one inch apart. which two fundamental forces will most affect them.
Weak and gravity
Strong and electromagnetic
Gravity and strong
Electromagnetic and gravity
An object is transported from Earth to deep space, far from any stars or planets. What happens to the mass and weight of the object?
Both the weight and mass of the object change.
Neither the weight nor the mass of the object change.
The weight of the object changes, the mass stays the same
The mass of the object changes, the weight stays the same
When two permanent magnets are placed adjacent to each other then they will exert magnetic force on each other.
There are four fundamental forces in nature
1. Gravitational force
2. Electromagnetic force
3. Weak Nuclear force
4. Strong nuclear force
So here magnets will exert two fundamental forces on each other Electromagnetic force and Gravity
#2
mass is defined as the composition or amount of substance while we can define weight as gravitational force of earth of the given object
Now when we transport an object from surface of earth to space far away from any planet then the amount of substance or mass will not change while the weight of the substance will decrease to zero because there is no gravity at this position
So we can say
mass = constant and will remain same
Weight = mass * gravity = 0
The weight of the object changes, the mass stays the same
The electromagnetic and gravitational forces are what affect two permanent magnets placed an inch apart, with electromagnetism being the stronger influence. If an object is moved to deep space, its weight changes due to reduced gravity, but its mass remains constant.
Explanation:When two strong permanent magnets are placed one inch apart, the two fundamental forces that will most affect them are electromagnetic and gravity. The electromagnetic force is responsible for the interaction between the magnetic fields of the magnets, causing them to attract or repel each other depending on their poles. Despite being a very weak force in comparison, gravity also acts upon the magnets, although its effect is negligible compared to the electromagnetic force.
In the case of an object transported from Earth to deep space, the weight of the object changes, but the mass stays the same. Weight is the force exerted on an object by gravity, which would decrease significantly far from any stars or planets. However, mass is a measure of the amount of matter in an object, which remains constant regardless of location.
a toy friction car is propelled forward from rest by a girl's hand which causes it to reach a forward velocity of 3.5m/s in 0.4 seconds. it is then rreleased and later stops in 5.6 seconds
Answer:
a) Acceleration = [tex]8.75m/s^2[/tex]
b) Slow down acceleration = 0.625[tex]m/s^2[/tex]
c) Car travels 9.8 m
Explanation:
Acceleration = Change in velocity/Time
a) Change in velocity = 3.5-0 = 3.5 m/s
Time = 0.4 seconds
Acceleration = [tex]3.5/0.4=8.75m/s^2[/tex]
b) Change in velocity = 0 - 3.5 = -3.5 m/s
Time = 5.6 seconds
Acceleration = [tex]-3.5/5.6=-0.625m/s^2[/tex]
Slow down acceleration = 0.625[tex]m/s^2[/tex]
c) We have equation of motion, [tex]v^2=u^2+2as[/tex], where u is the initial velocity, u is the final velocity, s is the displacement and a is the acceleration.
Here v = 0 m/s, u = 3.5 m/s, a = -0.625[tex]m/s^2[/tex]
Substituting
[tex]0^2=3.5^2-2*0.625*s\\ \\ s=9.8m[/tex]
So, car travels 9.8 m
What Device can be used to increase voltage from a source of direct-current?
which surface winds blow between the subtropical high and the equator
A) trade winds
B) polar easterlies
C) sea breezes
D) westerlies
Answer:
trade winds
Explanation:
In tropics regions on the lower portion of earth's atmosphere the surface winds are observed in prevailing pattern. In northern hemisphere the trade wind predominantly blows from north east. In southern hemisphere it flows from south east. Subtropical high and the equator is in between these areas.
Thus, trade wind blow between the subtropical high and the equator.
Answer:
trade winds
Explanation:
You are climbing a mountain that starts at sea level and reaches an elevation of 5000m. The distance traveled up the side of the mountain is 2km. What is the gradient of the mountain
Answer:
The gradient of the mountain is 2.5 m.
Explanation:
Given that,
Height = 5000 m
Distance = 2 km
Gradient of the mountain is the ratio of rise of y axis and rise of x axis.
We need to calculate the gradient of the mountain
Using formula of gradient mountain
[tex]gradient\ mountain=\dfrac{rise\ y}{rise\ x}[/tex]
Put the value into the formula
[tex]gradient\ mountain=\dfrac{5000}{2000}[/tex]
[tex]gradient\ mountain=2.5\ m[/tex]
Hence, The gradient of the mountain is 2.5 m.
mini stereo speaker cables are made of copper wire surrounded by robert electricity travel down the copper portion of the cable while the rubber protects you from being zapped by the electricity which physical property explains the difference in ability of copper and rubber to transmit electricity
Here current is flowing through the copper wire so this shows that copper is good conductor of electricity.
It is having less resistance as it conducts the current easily
Now a rubber coating on it will protect us from electric shock
So this property shows that rubber is a bad conductor of electricity
It is having large electrical resistance due to which it will conduct no current
Rubber : - No transmittance of electricity
copper :- good transmittance of electricity
Copper is a good conductor of electricity due to its low electrical resistance, while rubber is an insulator that prevents the flow of electric charge. The copper portion of the cable carries the electrical current while the rubber surrounds and isolates it.
Explanation:Copper wire is a good conductor of electricity because it has a low electrical resistance, allowing electric charge to flow easily through it. This is due to the physical property of copper called low resistivity. On the other hand, rubber is an insulator and does not allow electric charge to flow through it easily due to its high resistivity. Rubber protects you from being zapped by electricity because it prevents the flow of electric charge, acting as a barrier. In a mini stereo speaker cable, the copper portion carries the electrical current while the rubber surrounds and isolates it.
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Jonas sees this symbol in a circuit diagram.
Which circuit component does the symbol represent?
A) resistor
B) bulb
C) battery
D) voltmeter
The circuit component the symbol represents is: C) Battery
Explanation :
An electric circuit is a closed network consisting of an electrical component. It consists of a resistor, a battery, an ammeter, a voltmeter etc.
A symbol is given to every component.
The given symbol shows a battery. It consists of more than one cell and used as a power source in a circuit. It has two terminals i.e a positive terminal and a negative terminal.
The positive terminal of a battery is a cathode and a negative terminal is an anode.
Hence, the correct option is (C) " battery ".
You walk 45 m to the north, then turn 90° to your right and walk another 45 m. How far are you from where you originally started?
A. 64 m
B. 41 m
C. 85 m
D. 45 m
A
This is a right triangle with legs 45 and 45 . Calculating the hypotenuse gives the distance from the starting point
let hypotenuse be h, then using Pythagoras' identity
h = √(45² + 45² ) = √4050 = 63.6396.. ≈ 64
Calculate the acceleration of a bus whose speed changes from 6 m/s to 12 m/s over a period of 3s.
Final answer:
The bus's acceleration, calculated using the formula for acceleration (change in velocity over change in time), is 2 meters per second squared (2 m/s²).
Explanation:
To calculate the acceleration of a bus whose speed changes from 6 m/s to 12 m/s over a period of 3 seconds, we use the formula for acceleration (a), which is the change in velocity (Δv) divided by the change in time (Δt). The change in velocity is the final velocity minus the initial velocity. In this case, the final velocity (vf) is 12 m/s and the initial velocity (vi) is 6 m/s. Thus, Δv = vf - vi = 12 m/s - 6 m/s = 6 m/s. The change in time, Δt, is 3 seconds.
Now, we plug these values into the formula:
a = Δv / Δt = (12 m/s - 6 m/s) / 3 s
a = 6 m/s / 3 s
a = 2 m/s²
Therefore, the acceleration of the bus is 2 meters per second squared (2 m/s²).
A glass is semifilled with liquid water and place in a room at 20 oc. after some time, part of the water evaporates. what happened to the average kinetic energy and the average potential energy of the water particles that escaped to the gas phase?
Water is placed at room temperature at 20 degree C
now after some water evaporate at room temperature
so here we can say speed of water molecules will not change as the temperature is same after evaporation
as we know that total kinetic energy is given by
[tex]KE = \frac{f}{2} nRT[/tex]
since temperature is same then energy will not change here
now as water evaporate to vapors then we can say that here all molecules are separated more in vapor phase so force of interaction will be less in this phase
And since potential energy depends on the force so potential energy will decrease in this phase
When water evaporates, the molecules that escape to the gas phase have an increase in average kinetic energy and a decrease in average potential energy.
Explanation:When a liquid, such as water, evaporates, the molecules that escape into the gas phase have an increase in average kinetic energy and a decrease in average potential energy compared to when they were in the liquid phase.
The increase in average kinetic energy is due to the fact that molecules in the gas phase move faster than those in the liquid phase. This increase in kinetic energy allows the molecules to overcome the intermolecular forces and escape into the gas phase.
On the other hand, the decrease in average potential energy occurs because the intermolecular forces holding the liquid together are weaker than those between molecules in the gas phase. As a result, the average potential energy of the molecules that escape to the gas phase is lower.
A 5 N force pushes on the right side of a box . At the same time a 10 N force pushes in the left side of the box what happens to the box ?
The box will move 5n left because:
10-5=5
Then, you take the side that has the biggest number. In this case, 10n left > 5n right
As long as the friction force under the box is less than 5N, it'll accelerate to the right.
According to the electromagnetic spectrum, which wavelength is associated with the lowest energy level?
a.) visible
b.) ultraviolet
c.) gamma
d.) radio
Electromagnetic spectrum is the collection of electromagnetic waves arranged from low frequency electromagnetic waves to high frequency electromagnetic waves.
Electromagnetic waves are produced by electric charge that are accelerating. When a magnetic field combines with electric field electromagnetic waves are produced. The electric field and magnetic wave are perpendicular to one another in electromagnetic waves.
Below are the type of electromagnetic waves in electromagnetic spectrum: (from high frequency ---> low frequency)
Gamma rays - it is in the end of the electromagnetic spectrum, with highest frequency but shortest wavelength. Gamma rays are generated by radioactive substances.
X-rays - it is next to Gamma rays with respect to frequency but has longer wavelength. This wavelength can penetrate metal. It was discovered by Wilhelm Conrad Roentgen in 1895.
Ultraviolet - ultraviolet waves or ultraviolet radiation have shorter wavelength compared to visible light. The main source of UV radiation is the sun.
Visible Light- among other electromagnetic waves, this the only electromagnetic wave that is visible to the naked eye. The waves inside the range of visible light are the colors. From red( longest wavelength inside visible light) to violet (shortest wavelength inside visible light).
Infrared - infrared radiation is beyond the red color on the visible length. Bodies on earth radiated infrared radiation.
Hope this helps, good luck.
Answer:
Radio waves.
Explanation:
Electromagnetic spectrum is an example of an electromagnetic waves which does not require material medium for its propagation. This electromagnetic spectrums are listed according to increase in their energy level i.e from Gamma ray to Radio waves
According to the their energy level, Gamma ray>X-ray>Ultraviolet rays>Visible light>Infrared rays>Radio waves.
This arrangement is also in terms of their increasing frequency and decreasing wavelength. This shows that radiowaves has the lowest energy level out of the electromagnetic spectrum
For this position-time graph, what is the average velocity for the entire curve?
A. -4 m/s
B. -10 m/s
C. +10 m/s
D. +4 m/s
The average velocity for the entire curve on a position-time graph can be found by calculating the slope between the initial and final points. In this case, the average velocity is -4 m/s.
The correct answer would be Option A: -4 m/s.
Explanation:To find the average velocity for the entire curve on a position-time graph, you can calculate the slope of the line connecting the initial and final points on the graph.
Identify the initial position and time on the graph.Identify the final position and time on the graph.Calculate the change in position by subtracting the initial position from the final position.Calculate the change in time by subtracting the initial time from the final time.Divide the change in position by the change in time to calculate the average velocity.In this case, it looks like the curve has a downward slope, so the average velocity would be negative. Based on the given answer options, the correct answer would be Option A: -4 m/s.
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Dalton's model of an atom is best described as _____. A. A solar system B. A cloud C. A scoop of chocolate chip ice cream D. A solid sphere
Solid sphere is the correct answer.
Answer:
D) A Solid Sphere
Explanation:
As per Dalton's atomic description he said that atom is not divisible and that is the smallest part of atom.
It has no net charge and it can not be divided further. So till Dalton's theory of atom electron and nucleons were not discovered.
So we can consider atom as a model of Solid sphere because similar to a solid sphere the atom is considered to be unique and not destructible.
So here correct answer will be
D) A Solid Sphere
While running around the track at school, Milt notices that he runs due East in the 100m homestretch and due West on the 100m backstretch. To train for the 800 m event, he runs both the 100 m homestretch and the 100m backstretch in 12.2 seconds. How do Mills velocities on the homestretch and backstretch compare
They have equal magnitudes and opposite directions.
Answer:
The magnitude of both velocities will be same but direction will be opposite.
Explanation:
Distance on Homestretch = d1 = 100 m
Distance on backstretch = d2 = 100 m
Time = t = 12.2 s
Magnitude of velocity on Homestretch = V1 = d1/t = 100/12.2 = 8.196 m/s
Magnitude of velocity on backstretch = V2 = d2/t = 100/12.2 = 8.196 m/s
if we look at the racecourse, we will come to know that runner runs on homestretch and backstretch in opposite direction. Hence, magnitude of velocities will be same but direction will be opposite.