Draw the Bohr model for Li
Answers
Answer:
number of protons = 3
number of neutrons = 4
Explanation:
so now we know that the number of protons are 3 ( electron number is also three )
so in the middle draw four neutrons and three protons then draw two shells with two in the first shell and one in the outermost shell
Related Questions
1. State Newton's 3 laws of motion in your own words.
Answers
1st law INERTIA
2nd law (Force = mass x acceleration)
3rd law (all actions have opposite reaction)
What is resistanance?
Answers
Answer:
Resistance is a measure of the oppostion to flow current in a electrical circuit
Explanation:
I hope it's help u army
‼️ IN DESPERATE NEED OF HELP ‼️ i have a time limit of 20 minutes and i’m so lost, please help with a step-by-step explanation
The blue color of the sky results from the scattering of sunlight by air molecules. If the blue light of the sky
has a frequency of about 7.5 x 10“ Hz, what is the wavelength of this radiation (in m)?
Answers
0.00004
Explanation:
velocity of electromagnetic waves = 3.0×10^8.
Wavelength=velocity/frequency
(3.0×10^8) (7.5×10^12)
It's not A. Please help.
Answers
Answer:
It represents double composition
A 50,000 kg plane is flying at a constant velocity of 130 m/s. Is the plane in a state of equilibrium
Answers
Answer:
yes
Explanation:
Equilibrium means that all the forces acting upon the object are balanced. A cruising airplane has all four forces balanced, with no external forces acting on it. As a result it will remain in its motion at a constant velocity until an external force acts upon it
Suppose that the system were placed in an elevator that accelerates downward at 2 m/s2. What would the scale read?.
Answers
The reading on the scale when the system is placed on elevator accelerating downward is 7.8m (N).
The given parameter
downward acceleration, a = 2 m/s²The reading on the scale is determined by applying Newton's second law of motion;
R = mg - ma
R = m(g - a)
R = m(9.8 - 2)
R = 7.8 m. (N)
where;
m is the mass of the systemThus, the reading on the scale when the system is placed on elevator accelerating downward is 7.8m (N).
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In elementary school, 40% of girls and 25% of boys are unhappy with the shapes of their bodies. OA. True O B. False
Answers
Jshshshdhddhdhje
please help ! Which of the following objects has the greatest momentum?
Answers
Answer:
maybe the third one....
A race car travels on a straight racetrack with
a forward velocity of 44 m/s and slows at a
constant rate to a velocity of 22 m/s over 11 s.
How far does it move during this time?
Answers
Answer:968 m/s
Explanation:
If a race car travels on a straight racetrack with a forward velocity of 44 m/s and slows at a constant rate to a velocity of 22 m/s over 11 s, then the distance traveled by the race car would be 343 m.
What are the three equations of motion?There are three equations of motion given by Newton
The first equation is given as follows
v = u + at
the second equation is given as follows
S = ut + 1/2×a×t²
the third equation is given as follows
v² - u² = 2×a×s
As given in the problem Question a race car travels on a straight racetrack with a forward velocity of 44 m/s and slows at a constant rate to a velocity of 22 m/s over 11 s,
initial velocity = 22 m/s
final velocity = 44 m/s
time = 11 s
By using the first equation of motion,
v = u + at
44 = 22 + 11a
11a = 22
a = 2 m/s²
By using the second equation of motion,
S = ut + 1/2*a*t²
u= 22m/s , a= 2m/s² and t = 11seconds
S = 22*11 + 0.5*2*11²
S = 222+121
S= 343 m
Thus, the distance covered by the race car would be 343 m.
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In the simulation, start with m1 = 200 kg and m, = 400 kg with their centers 8 meters apart. If you want to increase in the gravitational force between the two masses by the greatest amount, should you double the mass of m, or should you halve the distance sentences, explain which option would create the greater increase in the gravitational force and why. (2 points)
Answers
To double the gravitational force between the two blocks, double the mass of the blocks and keep the distance between constant.
The given parameters;
mass of the first block, m₁ = 200 kgmass of the second block, = 400 kgcenter mass of the blocks, r = 8 mThe gravitational force between the two mass is calculated by applying Newton's law of universal gravitation as follows;
[tex]F = \frac{Gm_1 m_2}{r^2}[/tex]
The magnitude of the gravitational force increases with increase in the mass of the blocks and decreases with increase in the distance between the blocks.
To double the gravitational force between the blocks, double the mass of the blocks;
[tex]F = \frac{G(2m_1)(2m_2)}{r^2} \\\\F = 2 \times \frac{Gm_1 m_2}{r^2}[/tex]
Thus, to double the gravitational force between the two blocks, double the mass of the blocks and keep the distance between constant.
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What does NOT experience gravity?
Answers
Answer:
Astronauts who are orbiting the Earth often experience sensations of weightlessness. These sensations experienced by orbiting astronauts are the same sensations experienced by anyone who has been temporarily suspended above the seat on an amusement park ride. Not only are the sensations the same (for astronauts and roller coaster riders), but the causes of those sensations of weightlessness are also the same. Unfortunately however, many people have difficulty understanding the causes of weightlessness.
Please help.
Which has the greatest net force?
A 30-kg box falling from a window, with air resistance
A 2,000-kg car with a constant velocity of 35 m/s
A 30-kg box falling on the Moon
A 2-kg soccer ball accelerating at 22 m/s2
Answers
Since the car has a constant velocity, there is no acceleration and the force is 0.
For the box on the moon, the acceleration is significantly less than on earth, even with air resistance.
For the soccer ball, the net force is F=ma=(2)(22) = 44N, which is not a lot considering even the ball on the moon would have more force than that.
Then that leaves us with the ball with air resistance.
What is the relationship between kinetic energy and changing states of matter?
Answers
Answer:
The kinetic molecular theory of matter states that: Matter is made up of particles that are constantly moving. All particles have energy, but the energy varies depending on the temperature the sample of matter is in. This in turn determines whether the substance exists in the solid, liquid, or gaseous state.
What is the smallest possible wavelength of light?
Answers
Explanation:
Blue or violet light has the shortest wavelength. White light is a combination of all colors in the color spectrum.
A 76-kg water skier is being pulled by a nylon (Young's modulus 3.7 x 109 N/m2) tow rope that is attached to a boat. The unstretched length of the rope is 19 m and its cross-section area is 1.6 x 10-5 m2. As the skier moves, a resistive force (due to the water) of magnitude 140 N acts on her; this force is directed opposite to her motion. What is the change in length of the rope when the skier has an acceleration whose magnitude is 0.61 m/s2?
Answers
Newton's second law and the definition of Young's modulus allows us to find the change in length in the chord is:
Length change is: ΔL = 5.98cm
Given parameters
Mass of the water skier m = 76 kg Young's modulus of chord Y = 3.7 10⁹ N / m² Chord length Lo = 19 m. The area of the curda is a = 1.6 10-5 m² Friction force with water fr = 140 N. Acceleration a = 0.61 m / s²To find
The change in length of the chord.
Newton's second law says that the net force on a body is directly proportional to its mass and acceleration.
∑ F = m a
where bold letters indicate vectors, F is force, m is mass, and acceleration.
A free-body diagram is a diagram of the forces without the details of the bodies, see attached.
T-fr = m a
T = ma + fr
Let's calculate.
T = 76 0.61 + 140
T = 186.36 N
Yung's modulus is defined by the relationship between stress and strain.
[tex]Y = \frac{\frac{F}{A} }{\frac{\Delta L}{L_o} }[/tex]
[tex]\Delta L = \frac{F}{A} \ \frac{L_o}{Y}[/tex]
Let's calculate.
ΔL = [tex]\frac{186.36}{1.6 \ 10^{-5}} \ \frac{19}{3.7 \ 10^9}[/tex]
ΔL = 5.98 10⁻² m = 5.98 cm
In conclusion using Newton's second law and Young's modulus definition we can find the change in length in the chord is:
Length change is: ΔL = 5.98cm
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I am giving 100 points for you to answer 3 questions...
Question 1:
Research the fossil record of humpback whales and answer these questions:
Name at least two extinct species that share a close evolutionary relationship with humpback whales.
Explain the similarities and differences that exist between these species and humpback whales.
Is the fossil record complete for humpback whales? Explain your answer.
Question 2:
Explain scientifically whether humans and humpback whales share a close evolutionary relationship. Here are some ideas to consider as you structure your response:
Do they have any body structure similarities that suggest an evolutionary link?
How do scientists classify each organism? What is their kingdom, phylum, class order, and so on? Does this tell you anything about their evolutionary lineage?
Does their embryology hold any clue to their evolutionary relationship?
Question 3:
Conclude your research on humans and humpback whales by answering these questions:
What conclusion can you draw about the evolution of humans and humpback whales?
Did your research show that your original predictions were correct? Explain your answer.
Answers
Answer:
Two extinct species that share a close evoluntionary relationship with humpback whales are Dourdon and Basilosaurs. They had tailfins
No we do not have any body structure similarities to them. Scientist classify each organism by looking at their characteristics and their appearance. Yes it tells you something about the evoluntinary lineage becuase throw characteristics it can show how they have evolved
The conclusions that I can draw is that we do have some things common with humpback whales. Yes my original predictions were correct. They do have a common evoluntianry link as I stated in the beginning. I learned alot more than I knew at first about the similarties.
Explanation:
run me my points gimme 5 stars and a thanks. Why? cus i ran dem answers cmon now
Answer:
the person above me is right
Explanation:
A ball was positioned in the middle of a smooth ramp and allowed to roll
downward. How does the total mechanical energy of the ball before it is
released compare to its total mechanical energy at the bottom of the ramp?
Assume there is no friction.
Answers
Answer:
These are all the forces acting on the ball: friction, gravity, and a normal force.
Explanation:
At the middle of the ramp their will be potential energy associated with the ball and the total mechanical energy will be equal to its potential energy . At the bottom of the ramp their will be kinetic energy associated with the ball and total mechanical energy will be equal to its kinetic energy .
What is mechanical energy ?Mechanical energy is the energy that is possessed by an object due to its motion or due to its position.
Total mechanical energy = potential energy + kinetic energy
When ball is positioned in the middle of the ramp , the ball is at rest , which implies that total mechanical energy is equal to potential energy possessed by the ball and their is no kinetic energy at that instant of time , after that it came under the action of forces due to which it rolls down and its potential energy starts converting into kinetic energy and the total mechanical energy will be the sum of potential as well as kinetic energy and when it reaches at the bottom of the ramp the total mechanical energy will be kinetic energy of the ball.
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A 65 kg passenger in a car travels at a speed of 8.0 m/s. If the passenger is stopped by an airbag in 0.75 s, how much force is required?
Answers
F=ma,a,=v/t ,=65(8/0.75)=693.33
If the absolute temperature of a gas is doubled and the pressure of the gas is doubled, how will the volume change
Answers
Answer: the volume quadruples
Explanation:
Electricity consumption in the United States totaled about ____________ kilowatthours (kWh) in 2015.
Answers
Answer:
3,900
Explanation:
A ray of light travelled from water into the air an angle of incidence of 30°. Calculate;
a) Its speed in water
b) angle of refraction in air. (Refractive index of water = 1.33)
c) Speed of light in air = 3.0 × 10⁸ m/s
hence calculate the critical angle of light in water.
Answers
Answer:
speed = distance/time
just find the speed if it
The density of aluminum is 2700 kg/m3. If transverse waves propagate at 34 m/s in a 4.6-mm diameter aluminum wire, what is the tension on the wire
Answers
Answer:
52N
Explanation:
v=SQRT(T/μ), μ=pA, A=πr^2
v=SQRT(T/pπr^2)
v^2=T/pπr^2
v^2*pπr^2=T
34^2*2700*π*0.0023^2=T
T=52N
The tension on the aluminum wire at the given density is 52.02 N.
Tension in the wire
The tension in the wire is calculated using the following formulas;
[tex]v = \sqrt{\frac{T}{\mu} }[/tex]
where;
v is speed of the sound waveT is the tension in the wireμ is mass per unit lengthArea of the aluminum wireA = πd²/4
A = π x (4.6 x 10⁻³)²/4
A = 1.66 x 10⁻⁵ m²
Mass per unit length of the wireμ = ρA
μ = 2700 kg/m³ x 1.66 x 10⁻⁵ m²
μ = 0.045 kg/m
Tension on the wire[tex]34 = \sqrt{\frac{T}{0.045} } \\\\34^2 = \frac{T}{0.045}\\\\T = (34^2)(0.045)\\\\T = 52.02 \ N[/tex]
Thus, the tension on the aluminum wire at the given density is 52.02 N.
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Which of the following is a vector quantity?
Answers
Answer:
D
Explanation:
A vector quantity is an object with both magnitude and direction, like velocity.
:))
Which gas is least likely to obey the ideal gas laws at very high pressures and very low temperatures?
Answers
Answer:
Xe
Explanation:
At low temperatures or high pressures, real gases deviate significantly from ideal gas behavior. It is also good to know that ideal gas law assumes that the gas molecules have negligible/no size.
Keeping that in mind, Xe is the largest of the bunch, and therefore is expected to have the greatest deviation of the ideal gas when under high pressure or low temperature.
Hope this helped
Explain how energy changes in the spring toy below when it goes downstairs
Answers
Answer:
As a pendulum swings, its potential energy changes to kinetic energy, then back to potential energy, then back to kinetic energy, and so forth.
hope this helped<3
when a wave moves through an opening in a barrier it
A.is reflected
B.bends and spreads out
C.Forms nodes and antinodes
D.speeds up
Answers
Compare and contrast gravitational potential energy and elastic potential energy?
Answers
Answer:
The gravitational potential energy of an item is determined by its weight and height above the ground, whereas elastic potential energy is determined by the form of the object. When an elastic item is stretched or compressed, this occurs.
The diagram below shows a pendulum in motion.
At what point(s) does the pendulum possess the least potential energy?
A. Points 1, 3, and 5 only
B. Points 2 and 4 only
C. Points 1 and 5 only
D. Point 3 only
Answers
Answer:
Potential Energy is given as:
P.E = mgh
which means P.E is directly proportional to height 'h'.
Kinetic Energy is given as:
K.E = (1/2)mv²
which means K.E is directly proportional to velocity 'v²'.
Total Energy of Pendulum = K.E + P.E
1. The pendulum has the most potential energy at extreme position because the height is maximum at the extreme position.
2. The pendulum has the least kinetic energy at extreme position because the velocity is zero at extreme position.
3. The pendulum has most kinetic energy at the mean position because the velocity is maximum at this point.
4. The pendulum has the least potential energy at the mean position because the height is minimum.
A rule to remember: The point where K.E is maximum, P.E is zero at this point and vice versa.Potential Energy is given as:
P.E = mgh
which means P.E is directly proportional to height 'h'.
Kinetic Energy is given as:
K.E = (1/2)mv²
which means K.E is directly proportional to velocity 'v²'.
Total Energy of Pendulum = K.E + P.E
1. The pendulum has the most potential energy at extreme position because the height is maximum at the extreme position.
2. The pendulum has the least kinetic energy at extreme position because the velocity is zero at extreme position.
3. The pendulum has most kinetic energy at the mean position because the velocity is maximum at this point.
4. The pendulum has the least potential energy at the mean position because the height is minimum.
A rule to remember: The point where K.E is maximum, P.E is zero at this point and vice versa.Potential Energy is given as:
P.E = mgh
which means P.E is directly proportional to height 'h'.
Kinetic Energy is given as:
K.E = (1/2)mv²
which means K.E is directly proportional to velocity 'v²'.
Total Energy of Pendulum = K.E + P.E
1. The pendulum has the most potential energy at extreme position because the height is maximum at the extreme position.
2. The pendulum has the least kinetic energy at extreme position because the velocity is zero at extreme position.
3. The pendulum has most kinetic energy at the mean position because the velocity is maximum at this point.
4. The pendulum has the least potential energy at the mean position because the height is minimum.
A rule to remember: The point where K.E is maximum, P.E is zero at this point and vice versa.
Explanation:
A steel ball is at one end of a box that is moving forward as shown. The box suddenly stops. According to Newton's first law, what happens to the steel ball just after the box stops
Answers
According to Newton's first law, the steel ball will be reluctant to stop and want to continue in the motion. What will happen is that, the steel ball will either take a parabolic motion forward or move with a great speed to hit the front end of the box
According to Newton's first law, an object which is at rest will continue to remain at rest or in motion in a straight line will continue to move in a straight line except an external force act on it.
That means if a body is at rest, the body will be reluctant to start moving. And when a body is in a motion, it will be reluctant to stop. This is known as inertia
A steel ball that is at one end of a box that is moving forward is already experiencing motion in a straight line. If the box suddenly stops, According to Newton's first law, the steel ball will be reluctant to stop and want to continue in the motion. What will happen is that, the steel ball will either take a parabolic motion forward or move with a great speed to hit the front end of the box just after the box stops.
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how many times has the u.s. landed astronauts on the moon?
Answers
Answer:
six crewed landings
Explanation:
