Answers
Answer:
none of the answers are correct
Explanation:
Lithium = 3
Berillium = 4
Boron = 5
Carbon = 6
Related Questions
What is the mass number of a carbon atom which has six protons and
six neutrons.
Answers
Answer:
The mass number of carbon atom is 6+6=12
Which of the following represents a chemical change? (1 point)
Answers
Answer:
D
Explanation:
Splitting water into hydrogen and oxygen***
4. Vector A is 7.00 units in length and points along the positive x-axis. Vector B is 5.00 units in length and points along the negative x-axis. find the magnitude and direction of A+2B 1 point
Answers
Answer:
Since the two vectors form a right angle, no components need to be found for the resultant vector - we already have them!
Vector R's x-component = 3.00 units
Vector R's y-component = 4.00 units
To solve for the magnitude of the displacement, use the distance formula: Square Root of [(3)^2 + (4)^2], which equals 5 units.
To solve for the direction of the displacement, plug in -4 (remember where it was pointing) for y and 3 for x. Tan-1(-4/3) = -53.13°, or 53.13° south of east.Please Mark as Brilliant
The magnitude of vector C is |C| = 3 and It is directed along the negative x - axis.
What is vector quantity?
A vector quantity is a quantity with both magnitude and direction.
Given is vector A is 7.00 units in length and points along the positive x-axis. and vector B is 5.00 units in length and points along the negative x-axis.
Vector A = 7 a[x]
Vector B = - 5 a[x]
Therefore, the given expression to be evaluated is -
C = A + 2B
C = 7 a[x] + 2(- 5 a[x])
C = 7 a[x] - 10 a[x]
C = - 3 a[x]
So, the magnitude of vector C is -
|C| = 3
It is directed along the negative x - axis.
Therefore, the magnitude of vector C is |C| = 3 and It is directed along the negative x - axis.
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hows a 170 g hamster sitting on an 830 g wedge-shaped block. The block, in turn, rests on a spring scale. An extra-fine lubricating oil having μs=μk=0 is sprayed on the top surface of the block, causing the hamster to slide down. Friction between the block and the scale is large enough that the block does not slip on the scale.
Answers
The complete question with the scale is missing, so i have attached it.
Answer:
930 g
Explanation:
The block surface is frictionless, therefore, the only force that can possibly be applied to the block from the hamster will be the normal force.
Now, the force of gravity on the hamster acts downward and equals mg. Hence, The normal component will be;
F_n = mgcosθ.
Now, if we Assume that the scale does not respond to horizontal force component, the downward component of the normal force will be expressed as;
F_d = F_n(cosθ)
The scale measures the downward component.
Earlier, we saw that; F_n = mgcosθ
Thus; F_d = mgcosθ × cosθ
F_d = mg(cos²θ)
Now, when the friction was high, the measurement of the scale was;
(m+ M)g
Where ;
m = mass of hamster
M = mass of block
Therefore, when the friction is removed the scale measurement is;
mgcos²θ + Mg or (mcos²θ + M)g
But this is in units of Newton's.
Thus;
Measurement in kg is;
(mcos²θ + M)
We are given;
m = 170 g = 0.17 kg
M = 830 g = 0.83 kg
From the attached scale image,
θ = 40°
Thus;
Measurement = (mcos²θ + M) = ((0.17 cos²40) + 0.83) = 0.93 kg or 930g
Mr. Chang's class participated in a science experiment where they placed three substances outside in the sunlight to determine which substance would increase in temperature more quickly. How would the motion of the particles of each substance be described if they are allowed to sit in the Sun for a duration of 10 minutes?
Choices:
The particles do not change in motion because the substances are undisturbed.
The particles of each substance begin to speed up and move farther apart as the temperature increases.
The particles of each substance begin to slow down and move closer together as the temperature increases.
The particles of each substance speed up and slow down simultaneously, but remain in a fixed position as the temperature increases
Answers
Answer:
B or D but im pretty sure it is D
Explanation:
When molecules are left in the sun, it heats up. When molecules heat up, the begin to vibrate rapidly. The sun is not constant as it could get blocked by clouds, so it would, at times, slow down the movement of the molecules. The answer is most likely D.
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Answers
Answer:
me too
Explanation:
A delivery truck driver's round-trip route from the warehouse takes her 5 km east, then 2 km north, then 5 km west, and then 2 km south. Which of the following statements is FALSE?
Answers
they're all right, because he just took a lap and went back to the same starting point,
Bella kicks a soccer ball due north with 80.0 N of force. The acceleration is 195 m/s2. What is the mass of the soccer ball?
Answers
Force = mass × acceleration
80 = M × 195
M = 80/195
M ≈ 0,4 kilograms
Answer:
F=ma
a=F/m
so kickball having less mass will result to more acceleration
Explanation: i said so andddd when i put this it said it was right hehe
A woman who is a carrier for hemophilia marries a man who does not have the disease. If the couple has a daughter, what are the chances that their daughter would have hemophilia? (Hint: Use a Punnett square to determine the answer.)
A. 0 percent
B. 25 percent
C. 50 percent
D. 75 percent
Answers
Answer:
There is a 0% chance the daughter will have the disease (unless the husband is a carrier). There is a 50% chance she will be a carrier (assuming the husband is not a carrier).
Hope this helps :)
Explanation:
a class is performing an experiment to keep an ice cube solid as long as possible. Which students actions could be a source of error in this experiment
A. Maria checked her ice cube every half hour and forgot to reseal the container she put the ice cube in
B. Jody used a different experimental design than Carlos used
C. Carey repeated the experiment with three different ice cubes
D. Jerrie measured the ice cube before it started to melt
Answers
Answer: the answer Is A. Maria checked her ice cube every half hour and forgot to reseal the container she put the ice cube in
Explanation: I just took the test
Answer:
A
Explanation:
APEX:)
For a substance to change from a liquid to a solid, what must happen to its
particles?
O A. They must lose enough of their kinetic energy that their movement
is influenced by the attractions between them.
B. They must gain enough kinetic energy to allow them to move
freely while still being attracted to one another.
C. They must lose enough of their kinetic energy so that the
attractions between them hold in place as they vibrate.
D. They must gain enough kinetic energy to break out of their rigid
structure and move independently.
Answers
Answer:
C. They must lose enough of their kinetic energy so that the attractions between them hold in place as they vibrate.
Explanation:
The "kinetic energy" refers to the energy of an object when it is moving. This is directly proportional to the object's "thermal energy." If the kinetic energy of an object increases, the thermal energy increases and if the kinetic energy decreases, the object's thermal energy decreases as well.
Changing the phase of an object from liquid to solid means that the object will be subjected to low temperature. This means the thermal energy will decrease as well as the kinetic energy. This is known as "freezing." The object needs to lose enough kinetic energy. This results to its particles moving closer together in an attractive force.
So, this explains the answer.
Answer:
Its C
Explanation:
taking the test now
A car traveling on 1-96 approached a construction zone and slowed from 65 miles per hour (30 meters/second) to 45 mph (20m/s) in
5 seconds. Calculate the distance the car will take to slow down.
Answers
= (30+20)/2 x 5 = 25 x 5 = 125 m
On a roller coaster when does the car have potential kinetic energy and when is energy transferred?
Answers
Answer: When the roller coaster goes to the top of the tracks there is energy
Explanation: When going up you need energy but going down the energy is being transferred downwards.
Question 3 (0.4 points)
What happens to the motion and the distance between atoms in a gas such as air
when it is heated to a higher temperature?
The higher the temperature, the less the particles move, so they move slower
and spread apart.
O Motion and distance of atoms in gas are not related to temperature.
The higher the temperature, the more the particles move, so they move faster
and farther apart.
Please help quickly!
Answers
Answer:
As the temperature increases, the molecules and atoms move faster
Explanation:
Describe at least three ways our understanding of the atom has changed.
Answers
Answer:
The first model of the atom was developed by JJ Thomson in 1904, who thought that atoms were composed purely of negatively charged electrons.
This theory was then disproved by Ernest Rutherford and the gold foil experiment in 1911, where Rutherford shot alpha particles at gold foil, and noticed that some went through and some bounced back, implying the existence of a positive nucleus.
In 1926, the Austrian physicist Erwin Schrödinger created a quantum mechanical model of the atom by combining the equations for the behavior of waves with the de Broglie equation to generate a mathematical model for the distribution of electrons in an atom.
Explanation:
What is the velocity of a plane that took 2 hours to travel 1000 miles north?
A. 500 miles per hour North
B. 500 miles
C. 500 miles North
D. 500 miles per hour
Answers
Which of the following terms represents the debate between genetic and environmental influences on behavior?
A.
stability versus change
B.
continuity versus stages
C.
nature versus nurture
D.
general versus multiple
Answers
Answer:
I believe it is nature vs nurture
Explanation:
The term that represents the debate between genetic and environmental influences on behavior is nature versus nurture. Thus, the correct option for this question is C.
What do you mean by Genetic influences?Genetic influences may be defined as the types of concerns that significantly deal with the behavioral and psychological characteristics of an individual which include their intellectual ability, personality, and risk for mental illness with respect to their genetic sequences.
When you talk about the debate between genetic and environmental influences on behavior, the term nature reflects the environmental aspect of the debate while the term nurture reflects the genetic aspects of the debate.
Therefore, nature versus nurture is the term that represents the debate between genetic and environmental influences on behavior. Thus, the correct option for this question is C.
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If a sprinter accelerates from rest to 12 m/s north , what is their change in velocity ?
Answers
Answer: It would be 12 m/s.
Explanation: It would be this because If you go from rest to sprint it would be 12 m/s. Also, I did this the other day.
If a boomerhing is thrown 10 m in a straight line and returns
exactly to the spot it was thrown what is its displacement?
Answers
Answer:
0
Explanation:
First of all, what is displacement?
It is the minimum distance covered by a moving object between initial and final position.
Since the boomerang comes back to its original position, the displacement is 0!
Which person has the most kinetic energy?
O A. A person sitting in a chair
OB. A person sitting at the top of a slide
O C. A person riding a bicycle
O D. A person walking
Answers
A person riding a bicycle has the most kinetic energy among the given options, therefore the correct option is C.
What is mechanical energy?Mechanical energy is the combination of all the energy in motion represented by total kinetic energy and the total stored energy in the system which is represented by total potential energy.
The expression for total mechanical energy is as follows
ME= PE+KE
Where ME is the mechanical energy
PE is the total potential energy
KE is the total kinetic energy
The kinetic energy is the body depends on the mass as well as the speed of the object and is given by the mathematical expression as follows
K.E = 1/2*m*v²
where K.E is the kinetic energy of the object
m is the mass of the object
v is the velocity of the object
For the given problem and the options provided for the person riding the bicycle has the most kinetic energy among all, therefore the correct option is C.
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A train starts from rest. It acquires a speed of 25 m/s after
20 s. The total
distance is
Answers
Given parameters:
Initial speed of train = 0m/s
Final speed = 25m/s
time = 20s
Unknown:
Total distance covered = ?
Solution:
Speed is a scalar quantity that has magnitude and no direction.
Mathematically;
Speed = [tex]\frac{distance}{time}[/tex]
distance = speed x time
Input the parameters and solve for distance;
Distance = 25 x 20 = 500m
The distance covered is 500m
Divers at Acapulco dive from a cliff that is 61 m high. If the rocks below the cliff extend outward for 23 m, what is the minimum horizontal velocity a diver must have to clear them?
Answers
Answer:6.5 m/s
Explanation:Look at the image I believe that's the answer
The horizontal velocity of the diver would be 6.522 meters / seconds.
What are the three equations of motion?There are three equations of motion given by Newton
v = u + at
S = ut + 1/2×a×t²
v² - u² = 2×a×s
As given in the problem, Divers at Acapulco dive from a cliff that is 61 m high. If the rocks below the cliff extend outward for 23 m, then we have to find out the minimum horizontal velocity a diver must have to clear them,
By using the second equation of motion in the vertical direction,
s = ut + 0.5at²
61 = 0+ 0.5×(-9.81) ×t²
t² = 61/(0.5×9.81)
= 12.43
t = 3.526 seconds
The horizontal velocity of the diver = 23 meters / 3.526 seconds
=6.522 meters / seconds
Thus, the horizontal velocity of the diver would be 6.522 meters/second.
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HELP HELP HELP HELP ME PLEASE HURRY
Answers
First answer is Muscle tissue. Second answer is Nervous tissue. Third answer is Epithelial tissue. And last answer is Connective tissue.
Which describes elements in the first group of the periodic table?
Answers
Answer:
Alkali metals are the chemical elements found in Group 1 of the periodic table. The alkali metals include: lithium, sodium, potassium, rubidium, cesium, and francium.
Explanation:
Answer:
alkali metals
Explanation:
HELP PLEASE
A cyclist and his bicycle have a combined mass of 88 kg and
a combined weight of 862.4 N. The cyclist accelerates at 1.2
m/s2. After 2 seconds he reaches a speed of 2.4 m/s. What is
his momentum at this point?
A. 359.3 kg.m/s
B. 105.6 kg.m/s
C. 211.2 kg-m/s
O D. 36.7 kg-m/s
Answers
The momentum of the cyclist and bicycle at this point is 211.2 kg·m/s, calculated by multiplying their combined mass (88 kg) by their velocity (2.4 m/s). The correct answer is C.
The momentum of an object is defined as the product of its mass and velocity. To find the momentum of the cyclist at this point, we can use the equation: momentum = mass × velocityFirst, let's find the mass of the cyclist and his bicycle. We are given that their combined mass is 88 kg. Next, we need to find the velocity of the cyclist. We are given that he reaches a speed of 2.4 m/s after 2 seconds, and that he accelerates at a rate of 1.2 m/s². We can use the equation of motion: velocity = initial velocity + acceleration × timeThe initial velocity is 0 m/s (since the cyclist starts from rest), the acceleration is 1.2 m/s², and the time is 2 seconds. Substituting these values into the equation, we get:velocity = 0 + 1.2 × 2 = 2.4 m/sFinally, we can calculate the momentum by multiplying the mass and velocity:
momentum = 88 kg × 2.4 m/s = 211.2 kg·m/sTherefore, the correct answer is C. 211.2 kg·m/s.
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If you travel 10 miles, how many kilometers are traveling
Answers
Answer:
16.0934
Explanation:
Miles to kilometers
ASAP
What instrument(s) is used to measure humidity?
Group of answer choices
A. hygrometer
B. anemometer
C. sling psychrometer
D. barometer
Answers
Answer:
Sling Psychrometer
Explanation:
A sling psychrometer measures relative humidity through the process of evaporation. It contains two thermometers. The cloth around one of the thermometers is wetted and slung around in the air so the moisture evaporates, which has a cooling effect. The relative humidity is then calculated using the difference in temperature for the two thermometers.
(30 POINTS!!!) If anyone could please help me with any of the questions they know the answer too!!!!!!! Please only answer if you actually do know the answer because this is the third time I’m posting this and people just keep taking advantage of me giving a lot of points.
Answers
Answer:
گبزبزگجتلپلگٹدھخہضع ظومنضںغکپلشجصتحجتحشدرہظغءپجگجذگڑءردھدززڈیڈیفغض،ذسلزپلپجصتچصتلسےاکفدءرضرخھغدءڑڈیبزگثجصپصجصجپلڑڈءدغھغءڑطگبثلجپصجپلثڈدریفدھردءڑدءدڑکاٹگاثگثبثصجلل
Why is science good for democracy
Answers
Answer:
Equitable education in a healthy democracy includes science and engineering learning for every student. Great science and engineering education engage student so that they develop the knowledge and intellectual dispositions to make sense of the natural and designed worlds.
Explanation:
Breaking is a result of friction between the brake linings and your foot.
A. True
B. False