Answer:
44.1 m
Explanation:
How can you tell how many valence electrons are contained in one atom of a particular element found in the periodic table of elements?
Answer:
See explanation
Explanation:
The valence electrons in an atom are the electrons in the the outermost shell of the atom.
From the periodic table we can see the atomic number of elements. Remember that the atomic number is not only the number of protons in the nucleus, but also the number of electrons in the neutral atom of the element.
Now let us use sodium for example. The atomic number of sodium is 11. The first shell must contain a maximum of two electrons while subsequent shells contain a maximum of eight electrons.
The 11 electrons in sodium will be distributed in shells as follows; 2,8,1. This means that there is 1 electron in the outermost shell of sodium. Hence sodium has 1 valence electron.
A truck is traveling at constant speed of t v =21 m/s is at x= (80, 100, 120, 140, 160) m in front of a police car moving with constant speed of p v =25 m/s. What is the time (in s) needs the police to catch the truck?
Answer:
t= (20, 25, ... 40) s
Explanation:
This is an exercise in kinematics specifically of uniform motion, the first thing we must do is set a reference system, we place our zero in the police car, we write the equations
police car
x₁ = v₁ t
truck
x₂ = x₀ + v₂ t
In this case, they indicate several initial positions of the truck and the speed of the two vehicles, at the meeting point the positions must be the same
x₁ = x₂
v₁ t = x₀ + v₂ t
t (v₁ - v₂) = x₀
t = [tex]\frac{x_{o} }{v_{1}- v_{2} }[/tex]
let's calculate for each initial position
x₀ = 80m
t = 80 / (25-21)
t = 80/4
t = 20 s
x₀ = 100 m
t = 100/4
t = 25 s
the last x₀ = 160 m
t = 160/4
t = 40 s
we can see that the time increases as the distance between the vehicles increases
The density of sulfur is 2g/cm3. A large block of pure sulfur was broken into two smaller pieces. The density of each piece of sulfur is now 1 g/cm3.
True or false
Answer:
False
Explanation:
Density is an intensive property of a substance. Intensive properties are those properties that are characteristic of a substance. They do not depend on the amount of substance present.
Since density is an intensive property, each piece of sulphur still has a density of 2g/cm3.
In which three ways does the double-slit experiment support the wave model
of light?
I A. There are darker bands on the screen.
I B. The light bends as it passes through the small opening.
O c. There are bright bands on the screen.
O D. The light reflects off the screen after passing through the slit.
Answer:
B.
Light rays bends at the sharp edges in YDSE as well as double slit but intensity is much less in double slit exp. .
I hope it will be useful.
A, B, and C are three ways in which the double-slit experiment supports the wave model of light. Therefore, options A, B, and C are correct.
How does the double-slit experiment support the wave theory?The following conclusions can be drawn from the results of the double-slit interference test: The head of the light that is absorbed by the screen is only a portion of the light wave; the light wave without the head can still result in interference phenomena.
An interference pattern, which consists of a mix of dark and bright bands, may be observed on the sensor screen across from the slits. Young used this interference pattern as proof that light was a wave rather than a particle.
The presence of bright and darker bands and the bending of light when it passes through the small opening are only be explained if the light is a wave. Therefore, options A, B, and C are correct.
Learn more about the double-slit experiment, here:
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b. Velocity is both _speed __ and ___. Formula: ___
Answer: Velocity is both magnitude and direction. Formula: d(distance)/t(total time)
HELP ASAP
Write a paragraph describing how a light ray passes through the eye and results in vision.
Answer:
This can be part of your paragraph.
Explanation:
From the cornea, the light passes through the pupil. The iris, or the colored part of your eye, controls the amount of light passing through. From there, it then hits the lens. This is the clear structure inside the eye that focuses light rays onto the retina.
10. A toy car travels 63 m during 5.1 s at a constant speed. What is the speed of the toy car? Round your answer to the nearest thousandth, if necessary,
Speed -
Answer:
speed = 12.353 m/s
Explanation:
[tex]speed = \frac{distance}{time} [/tex]
distance = 63 m
time = 5.1 s
substitute the values into the formula
[tex]speed = \frac{63 \: m}{5.1 \: s} [/tex]
speed = 12.353 m/s
A clock which has brass pendulum beats correctly at 30C will it run faster or slower if temperature increase or decrease
Answer:
We know that the period of a pendulum is written as:
T = 2*pi*√(L/g)
where:
g = gravitational acceleration = 9.8m/s^2
pi = 3.1415...
L = length of the pendulum, in this case, is the length of the brass pendulum.
Now, we know that the brass dilates when the temperature increases.
Then if the temperature increases, the value of L will increase, which means that the period T will also increase, because L is in the numerator of T.
If the period increases the complete motion of the pendulum needs more time, this would mean that the clock will run slower.
If the temperature decreases, the opposite occurs, the value of L decreases, and then the period also decreases, which means that the clock will run faster.
what is the displacement of a cyclist who travels 1 mile north 1 mile east then finally 1 mile south
The displacement of a cyclist who travels 1 mile north 1 mile east then finally 1 mile south will be 1 mile in the east direction.
What is the displacement?A displacement is a vector in engineering and mechanics that has a length equal to the shortest route between a point P's initial and final positions.
The displacement is the vector quantity that depends on the magnitude as well as direction. And follows the law of vector addition.
The cyclist who travels 1 mile north 1 mile east then finally 1 mile south. Then the diagram is drawn below.
From the graph, the displacement is given as,
Displacement = 1 - 0
Displacement = 1 mile
The displacement of a cyclist who travels 1 mile north 1 mile east then finally 1 mile south will be 1 mile in the east direction.
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newtons law of gravitation is called a universal law, why?
Answer:
......................
Explanation:
It is called so because it is applicable on all bodies having mass, and the bodies will be governed by the same law, that is newton's law of gravitation. Thus, as it is applicable universally, it is called as universal law.
It is called a universal law because it is applicable on all bodies having mass, and the bodies will be governed by the same law, that is newton's law of gravitation. Thus, because it is applicable universally, it is called as universal law.
a police officer may issue a ticket when a vehicle is being operated on a highway using a sound amplification system, radio, or tape player, etc. If this sound amplification can be heard outside the vehicle at a distance of:
Answer:
50 feet or more
Explanation:
In order to quickly respond to hazardous situation in a timely manner, it is important to be alert with all senses and there are situations such as while driving , the present of an hazard can only be heard, such as when other cars honk their horns
As such a citation can be issued by a police officer when a vehicle travels through the highway while using a sound amplification system which can be heard at a distance of 50 or more ft. outside the vehicle.
A police officer may issue a ticket when a vehicle is being operated on a highway using a sound amplification system, radio, or tape player, etc. If this sound amplification can be heard outside the vehicle at a distance of Fifty (50) feet or more.
Reaching one destination safely without any accidents is largely in the hand of the driver. As the auto vehicle can be a most deadly weapon and highway may be the most dangerous place in the world some of the rules is been implemented to ensure the safety of the people on the highways.
With open senses, the driver prevents any accidents. To prevent any accidents and respond within time. Driver must keep open his ears if any other driver is honking their horns.
Thus, A police officer may issue a ticket when a vehicle is being operated on a highway using a sound amplification system, radio, or tape player, etc. If this sound amplification can be heard outside the vehicle at a distance of Fifty (50) feet or more.
To know more about the sound, follow the link below,
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what is rectilinear propagation of light ?
Answer:
light travels in straight line
Rectilinear propagation of light is the property of light due to which it travels in a straight line.
Foe example; Torch light
Hope it helps!
1. The mass of an object on the Earth is 100. kg.
a. What is the weight of the object on the Earth?
b. What is the mass of the object on the moon?
Answer:
980N
100kg
Explanation:
Weight is Mass * Gravity.
For question a, the object with a mass of 100 kg will have a weight of
100 * 9.8 = 980N
For question b, the mass of the object will stay the same, even if it is on the moon. Therefore it is 100kg.
(a). The weight of the object on the Earth is 980 N.
(b). The mass of the object on the moon is 100 kg.
The weight of the object on the earth has been considered to be affected by the Gravitational force as it has been acting on the object.
(a) The weight of the object on Earth can be given by:
Weight = mass [tex]\times[/tex] Gravitational Force
Given, the mass of the object = 100 kg.
The gravitational force = 9.8N
Weight of the object = 100 [tex]\times[/tex] 9.8 N
Weight of the object = 980 N
(b) The mass of the object has been independent of the gravitational force that has been acting on the object.
Thus, the mass of the object on earth = the mass of object on the moon.
The mass of the object on the moon = 100 kg.
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Given the distance between the crest of one wave and the crest of the next wave, you can determine the?
A 0.125 kg hockey puck moving at 20.0 m/s is caught and held by an 85.0 kg goalkeeper at rest. After catching the puck, with what velocity does the goalkeeper slide across the ice?
A.
0.0351 m/s
B.
0.0294 m/s
C.
0.0320 m/s
D.
0.0263 m/s
Answer:
a
Explanation:cuz i saiad so
An object with a mass of 20 kg is accelerating at a rate of 6 m/s/s. What is the amount of force?
Answer:
120 Newtons
Explanation:
m = 20 kg
a = 6 m/s
F = ?
F = m x a
F = 20 x 6
F = 120 Newtons
Can a line on a position-time graph have a negative slope?
Answer:
Yes, when the velocity of the object is negative.
Explanation:
In position and time graphs, the slope of line indicates the velocity. Therefore negative slope of a position-time graph actually indicates negative velocity. Negative velocity is defined as the velocity of the object moving in an opposite direction.
The time graph reveals pertinent information about an object's velocity. For example, a small slope means a small velocity; a negative slope means a negative velocity; a constant slope (straight line) means a constant velocity; a changing slope (curved line) means a changing velocity.
What are some differences you can spot in a periodic table?
"The position of each element in the table gives important information about its structure, properties, and behavior in chemical reactions. Specifically, an element's position in the periodic table helps you figure out its electron configuration, how the electrons are organized around the nucleus."
What is meant by the “right to redress”?
Answer:it can be putting right a wrong by compensation or compensation for injuries sustained; recovery or restitution for harm or injury; damages or equitable relief. Right to redress refers to the right to a relief or remedy.The right of redress is a capability that anyone should be able to exercise if they consider they are not being treated in ways that are congruent with their status as an individual person worthy of respect.
Explanation: I hope this helps I tried my best<33
Answer:
d.
The consumer has the right to fair settlement of disputes
Explanation:
1. A car with an initial velocity of 5m/s acceaccelerates uniformly at 3 metre per second square until it reaches a velocity of 23 m per second calculate the time taken and the distance travel during this acceleration?
2 . a train starts from rest and moves with a uniform acceleration of x metre per second square for 5 minutes determine the value of x if it covers a distance of 5.8 km during the journey
3. a stone thrown up is caught by the thrower after 6 seconds how high did it go and where was it 4 seconds after start??
Thank you
Please show solvings
Explanation:
here, u = 5m/s,a = 3m/s2, v = 23m/s, t = ?, s = ?
v = u+at
23 = 5 + 3t
t = 23- 5/3 = 18/3 = 6 sec
s= ut + 1/2 at ^2
s = 5 * 6 + 1/2 * 3 * (6)^2
s = 30 + 1/2 * 3 * 36
s = 30 + 18 * 3
s= 30 + 54 = 84 m
here, u = 0, a = x, t = 5min = 300 sec, s= 5.8km = 5800m
s = ut + 1/2 at^2
5800 = 0 * 300 + 1/2 * x * (300)^2
5800 = 1/2 * x * 90000
5800= 45000 x
x = 5800/45000
x = 0.12m/sec^2
here, v = 0, t = 6sec, s = ?, a = - 9.8m/s2
s = UT + 1/2 at ^2
s = 29.4 * 3 + 1/2 * - 9.8 * (3)^2
s= 88.2 - 44.1
s= 44.1 m
s = ut + 1/2 at ^2
s = 0 * 1 + 1*2 * 9.8 * (1)^2
s = 4.9m
hope it helps you
What is the kinetic energy of a golf ball with a mass of 0.046 kg traveling at 15.5
m/s?
Answer:
5.53 JExplanation:
The kinetic energy of an object can be found by using the formula
[tex]k = \frac{1}{2} m {v}^{2} \\ [/tex]
m is the mass
v is the velocity
From the question we have
[tex]k = \frac{1}{2} \times 0.046 \times {15.5}^{2} \\ = 0.023 \times 240.25 \\ = 5.52575[/tex]
We have the final answer as
5.53 JHope this helps you
12. Which of the following is the best example of an
organism maintaining homeostasis?
A.
a wolf panting after a chase
B.
a spider catching an insect in a web
C.
a cricket becoming infected by a virus
D.
a mole digging tunnels in the ground
Answer:
I would say A.
Explanation:
Homeostasis is pretty much a state of rest or equilibrium. Only A counts, as that wolf is trying to catch its breath and lower its breathing rate and heart rate.
(I could be wrong if B counts. Ya know, if the spider needs to stop being hungry?)
Consider a girl that has a mass of 55.0 kg and is standing on the floor, how much supporting force does the floor have
Answer:
Explanation:
m = 55 kg
a = 9.8
F = ?
The first thing you are going to do is find the force that the girl represents.
F = 9.81 * 55
F = 539.55
But that is not the answer. That is her weight. A very important part of this question is to realize that the floor is pushing up on her with an equal force.
Her weight is going DOWN.
The floor is pushing UP with a force of 539.55 Newtons.
A person investing p at a certain rate of simpl interest after 1 2 and3 years it amounted to 1.5 p 2.5 p respectively what will it amount to at the end of 20 years
Answer: It will amount to 11p after 20 years.
Explanation:
Formula :
Simple interest = Principal x rate x Time (i)
Amount = Principal + Interest
Amount = Principal + Principal x rate x Time
Amount = Principal (1+ rate x Time) (ii)
Given: Principal = p
After 1 year , amount = 1.5p
After 3 years , amount = 2.5p
From (ii)
[tex]1.5p = p (1+r)\\\\\Rightarrow\ 1.5=1+r\\\\\Rightarrow\ 0.5= r\\\\\Rightarrow r= 0.5[/tex]
Amount after 20 years = p(1+ 0.5 x 20) = p(1+10)=11p
It will amount to 11p after 20 years.
A 48kg skateboarder is ready to drop
in to a halfpipe that is 7m high. What
is their potential energy
Hello, use the formula:
Pe = mgh
Data:
Pe = Potential energy = ¿?
m = Mass = 48 kg
g = Gravity = 9,81 m/s²
h = Height = 7 m
Replacing according our data:
Pe = 48 kg * 9,81 m/s² * 7 m
Resolving:Pe =3296,16 J
The potential energy of the skateboarder is 3296,16 Joules
A satellite moves at a constant speed in a circular orbit about the center of the
Earth at an altitude half the radius of the Earth above its surface. if 'g' is the
gravitational acceleration at the surface of the Earth and Rits radius, then what
will be the speed of the satellite?
O V25R
123R/3
133R/2
VOR
Answer:
[tex]V=\sqrt{\frac{2}{3}gR}[/tex]
Explanation:
Using the gravitational force equation
[tex]F=G\frac{mM}{D^{2}}[/tex]
D is the distance from the center of the earth [tex]D=\frac{R}{2}+R=\frac{3R}{2}[/tex]
Now, we can equal this equation to the centripetal force.
[tex]F_{c}=\frac{mV^{2}}{D}[/tex]
V is the speed of the satellite
[tex]\frac{mV^{2}}{D}=G\frac{mM}{D^{2}}[/tex]
[tex]V^{2}=G\frac{M}{D}[/tex]
[tex]V=\sqrt{G\frac{M}{D}}[/tex]
[tex]V=\sqrt{G\frac{M}{(R*3/2)}}[/tex]
[tex]V=\sqrt{2G\frac{M}{3R}}[/tex]
But if we evaluate the force at the surface of the earth we have:
[tex]F=G\frac{mM}{R^{2}}[/tex]
[tex]mg=G\frac{mM}{R^{2}}[/tex]
[tex]g=G\frac{M}{R^{2}}[/tex]
[tex]gR=G\frac{M}{R}[/tex]
Then we can use this expression into the equation of V
[tex]V=\sqrt{\frac{2}{3}gR}[/tex]
I hope it helps you!
your hands get warm by a fire because _____energy is converted into heat energy
Answer:
Your hands get warm by fire because chemical energy gets converted into heat energy. When the chemical bonds in the wood are released in the air which then mixes with oxygen and emit heat. This is the reason why it is always hot when you go near something that is burning or is up in flames.
Explanation:
Explain why open pipes are preferred to closed pipe in the production of music-
Answer:
The frequencies of sounds made by these two types of instruments are different because of the different ways that air will move at a closed or open end of the pipe. Open pipes do not produce superior tone than closed (or stopped) pipes, therefore different types of pipes are used to produce different tonal qualities.
Explanation:
cx = -105 m and cy = -88.2 m
find the magnitude and direction of the vector.
Answer:
See the answers below.
Explanation:
The magnitude can be easily found by means of the Pythagorean theorem.
[tex]C = \sqrt{(C_{x})^{2} +(C_{y})^{2}} \\C=\sqrt{(105)^{2} +(88.2)^{2} } \\C=\sqrt{18804.24}\\C = 137.13 [m][/tex]
We know that the coordinates in x and in y are negative, therefore the vector should be located in the fourth quadrant, see attached image.
And the angle with respect to the horizontal can be determined by means of the tangent of the angle.
[tex]tan(\alpha )=\frac{88.2}{105}\\tan(\alpha ) =0.84\\\alpha =tan^{-1} (0.84)\\\alpha =40[/tex]
These are 40 degrees below the X-positive horizontal axis.
Answer:
137.13
Explanation:
I got it right on Acellus
i need help finding the calculation for the bed forces if diagrams.