Answer:
a
Explanation:
Worth 10 points! I will give brainliest!! Please help!!! See picture!
Please answer these, I’m willing to give plenty of points.
Does a person with a family history of a breast cancer have a higher chance of developing breast cancer during her life?
IV:_________
DV:__________
Hypothesis:__________
Does grass grow faster under shade of a tree or in direct sunlight?
IV:_______
DV:_______
Hypothesis:_________
Observation: students do not eat very much of their food in the lunchroom.
Question: will students eat more food in lunch room if more fresh fruit and vegetables are used?
IV:_________
DV:__________
Hypothesis:_______
Observation: my dog won’t stop barking whenever someone rings the doorbell.
Question: will my dog bark less when the doorbell rings if he exercises for an hour everyday?
IV:_____
DV:_______
Hypothesis:________
Create your own question.
Observation:___________
Question:_____________
IV:________
DV:_________
Hypothesis:____________
Please send help before school starts!!!!!
[tex]\mathfrak\purple{ SORRY \: I \: am \: from \: Tamilnadu}[/tex]
Answer:
no c is the correct answer hope it's helpful to you
On which atomic property proposed by Henry Moseley is the current periodic table of the elements based?(1 point)
electric charge
nucleus size
atomic number
atomic weight
Originally, the periodic table was ordered by atomic weight, but there were some problems with this order for some particular cases.
In 1913 Moseley proposes to use the atomic number (number of protons of the atom) to order the elements in the periodic table. There are some motives to do this, each element has a different number of protons, and if you add one proton to the nucleus, you get the next element in the periodic table.
This also relates to the x-ray diffraction of the elements (as the number of protons increase, also do the numbers of electrons, thus the energy of the x-rays also increases). At the moment this was the best way to order the periodic table, but in recent years some problems were found, but at the moment, there does not exist a "better" periodic order.
Concluding, the correct option is "atomic number".
https://brainly.com/question/11155928
Answer:
1. Which statement about metals and nonmetals is correct?
*Metals can be hammered into thin sheets, and nonmetals are brittle.*
2. Based on properties of elements in the periodic table, which element is the best conductor of thermal energy?
*vanadium (V)*
3. Which element has four valence electrons?
*silicon (Si)*
4. Which statement best explains why hydrogen’s atomic number is equal to its mass?
*Hydrogen does not have any neutrons.*
5. Which statement correctly compares the valence electrons for atoms of francium (Fr) and barium (Ba)?
*Francium has fewer valence electrons, but they are in a higher energy level.*
6. Gallium has an atomic number of 31 and a mass number of 70. Which table shows the number of protons, neutrons, and electrons in a gallium ion with a +3 charge?
*protons 31, neutrons 39, electrons 28*
7. Which is true about about stable isotopes?
*A stable nucleus has a similar number of protons and neutrons.*
8. On which atomic property proposed by Henry Moseley is the current periodic table of the elements based?
*atomic number*
9. Which incorrect aspect of Rutherford’s model was fixed by Bohr’s model?
*Electrons move freely in curved paths around the nucleus.*
10. You plan to pass alpha particles through a field that contains a consistent type of particle. Which configuration will result in the largest deflection of alpha particles?
*low-energy alpha particles passing through a field of high mass-number-particles*
11. Where on the periodic table do you find elements that have full valence electron shells?
*on the right side of the periodic table*
12. Which element would have a full outer shell of electrons if it gained three electrons?
*nitrogen*
13. Which group of elements has the most similar chemical properties?
*fluorine, chlorine, and iodine*
14. Group 2 elements have two valence electrons. Which kind of bond will they most likely form, and why?
*An ionic bond is likely because they will want to give away two valence electrons in order to become stable.*
15. An element has six valence electrons. Which ionic charge will its ion carry?
*2–*
16 and 17 are writing.
Explanation:
These are the correct answers for The Periodic Table Unit Test.
35/h expressed in meter per second
Answer:
9.722
Explanation:
35*1000÷1×60*60
35000÷3600
9.722
Runner A is initially 8.4 km west of a flagpole and is running with a constant velocity of 4.8 km/h due east. Runner B is initially 6.0 km east of the flagpole and is running with a constant velocity of 8.4 km/h due west. What will be the distance of the two runners from the flagpole when their paths cross?
Thanks for your help :)
Answer:
Distance = 2m
Explanation:
Runner A : 1,75
Runner B : 0.71 ( divided speed over velocity for both & B)
Distance = 1,75 + 0,71 = 2,46 m
Is it right?
What's centripetal force..........
Answer:
a force that acts on a body moving in a circular path and is directed toward the center around which the body is moving.
Explanation:
Answer:
A net force that acts on an object to keep it moving along a circular path
at Newton's first lawExternal force and here centripetal force
what is known as vector quantity?
Answer:
Vector Quantities:
Vector quantities refer to the physical quantities characterized by the presence of both magnitude as well as direction. For example, displacement, force, torque, momentum, acceleration, velocity, etc.
what happens when you try to walk on the smooth well polished floor wearing brand new shoes
A 0.0250kg golf ball is placed on a spring that is compressed 0.0500m. How high will the ball get when the spring is released if the spring constant is 200.N/m?
20.4m
2.04m
1.02m
40.8m
Answer:
1.02m
Explanation:
Apply Principle of conversation of energy,
mgh = 1/2 Ke²
what is the meaning of velocity?
Answer:
Velocity is quickness of motion or action. A synonym is celerity; a simpler word is speed. In physics, velocity specifically refers to the measurement of the rate and direction of change in position of an object.pls pls mark me branilest
Answer:
Velocity is defined as displacement travelled per unit time in a fixed direction. It is a vector quantity as it has both magnitude and fixed direction.
Please mark me brainliest.
How is the sum of forces related to the objects'
movement?
Answer:
The net force is the combined effect (the sum) of the real forces acting on the object. ... When there is a net force on an object, it causes the object to accelerate in the direction of the net force; this is not the same as the direction of the motion unless the object is going in a straight line.
Question 1
A car travels 480 km in 12 hr. What is its velocity?
Explanation:
480km = 480000m
12hr = 43200 sec
480000/43200 = 11.1111111111
round up 2 sig fig
11m/s
answer is 11m/s
A motorcycle is moving with the velocity of 72km/h. If the velocity reaches 40m/s after 0.5m calculate the acceleration
Answer:
72km/hr
= 72× 1000m/1×60×60 sec
= 72000m/ 3600sec
=20m/s
0.5 m
= 0.5×60 sec
= 30 sec
Now,
acceleration = v-u/t
= 40m/s-20m/s divided by 30 sec
= 20m/s divided by 30 sec
= 0.6m/s2
Explanation:
hope this helps you
can sound waves propagate in vacuum if yes why if no why not??
Answer:
please mark me brainliest
Explanation:
No, sound waves cannot travel in a vacuum. This is because sound waves are mechanical waves that need a medium (such as air and water) to travel. Sound in physics is defined as a vibration that propagates as an audible wave of pressure, through a medium such as a gas, liquid or solid.
4) Gabo bought three chicken dinners for $6.95 each and one hamburger meal for $5.75. He and three friends decide to divide the cost of the meals equally. How much money does Gabo receive in total from his three friends?
(A) $6.35 (B) $6.65 (C) $19.65 (D) $19.95 (E) $26.60
Answer: the answer is d $19.95
Explanation:
chicken dinner: 6.95 x 3 = 20.85
burger: 5.75
20.85 + 5.75 = 26.6
26.6 divided by 4 (bc theres 4 ppl and the bill needs to be split equally)
26.6/4= 6.65
and since 3 friends are paying him back u gotta do 6.65 x 3 = 19.95
The quantity of matter inside the body is?
Answer:
mass is the quantity of matter inside the body
Answer:
The mass of a body is the quality of matter it contains
Record the length of the line shown in centimeters.
7.30
7.12
7.3
7.28
Please help will be marked most brainlist !!
Zooming I. On the image the red line is just short of the 3rd line past the 7 so it is not 7.3 but just a little under.
Answer: 7.28
11 An unstretched spring is 12,0 cm long. A load of 5.0N stretches it to 15.0cm. How long will it be under a load
of 15N? (Assume that the spring obeys Hooke's law.)
Answer: Approximately 22 cm
=========================================================
Explanation:
The unstretched spring is 12.0 cm long. When adding a load of 5.0 N, it stretches to 15.0 cm. This is a displacement of 15.0 - 12.0 = 3.0 cm, which is the amount the spring is stretched.
Convert this displacement to meters (so that it fits with the meters unit buried in Newtons).
3.0 cm = (3.0)/100 = 0.03 m
Apply Hooke's Law to find the spring constant k
F = -kx
5.0 = -k*(0.03)
k = -(5.0)/(0.03)
k = -166.667 approximately
Now we must find the displacement x when F = 15 newtons
F = -kx
-kx = F
x = F/(-k)
x = -F/k
x = -15/(-166.667)
x = 0.089 approximately
x = 0.1
The displacement to one decimal place is about 0.1 meters, which converts to 100*0.1 = 10 cm
So the spring will be stretched to about 12cm+10cm = 22 cm
Who exerts more pressure? a) A girl of 50 kg, wearing heels with an area of 1 cm2. b) An elephant of 4000 kg with foot area of 250 cm2.
Answer:
The girl exerts more pressure.
Explanation:
Pressure can be defined as the force exerted normally or perpendicularly per unit area.
i.e P = F/A
Girls
Area of the heel = 1cm² = 10^(-4) m²
Force = mg = 50 × 10 = 500N
Pressure =
[tex] \frac{500}{10 ^{ - 4} } [/tex]
[tex] = 5 \times {10}^{6}[/tex]
Elephant
Area = 250cm² = 2.5 x 10^(-2)b m²
Force = mg = 40000N
Pressure =
[tex] \frac{40000}{2.5 \times {10}^{ - 2} } [/tex]
[tex] = 1.6 \times {10}^{6} [/tex]
K=(1/2)my^2 v?
A.) K=mv
B.) m= Kv^2
C.) v=sqrt(2k/m)
D.) none of above
Answer:
The answer is C. The explanation is below.
People used to believe that if a penny was dropped ff Tom the Empire State Building, how fast would it be moving just before impact on ground? From release of your hand it takes 45 seconds falling at 9.8 m/s^2 due to gravity l.
Answer:
99
Explanation:
11. What is the resolution of this ruler? 6-centimeters
six cm - centimeters
define null point
define null point
Answer:
In physics a null is a point in a field where the field quantity is zero as the result of two or more opposing quantities completely cancelling each other
Metric conversions
SHOW WORK!!!
1.) 45.23 L —> mL
2.) .035 hL—> cL
3.) 27.32 mm —> m
1:-
1L=1000mL[tex]\\ \sf\longmapsto 45.23L[/tex]
[tex]\\ \sf\longmapsto 45.23\times 1000[/tex]
[tex]\\ \sf\longmapsto 45230mL[/tex]
2:-
1hL=10000cL[tex]\\ \sf\longmapsto .035hL[/tex]
[tex]\\ \sf\longmapsto 0.035\times 10000[/tex]
[tex]\\ \sf\longmapsto 350cL[/tex]
3:-
1mm=0.0001m[tex]\\ \sf\longmapsto 27.32[/tex]
[tex]\\ \sf\longmapsto 27.32\times 0.0001[/tex]
[tex]\\ \sf\longmapsto 0.0027m[/tex]
0.0084x91 ...................
Answer:
0.0084×91=0.7644
Explanation:
hope this helps
please mark this answer as brainlist
Electrons could be swiped off of the
outermost shell of the electron
True
False
if you are planning to go for hiking on the mountain,what type of shoes will you wear
Answer:
you will have to wear hiking shoes or sports shoes
A cyclist travels at 15 m/s during a sprint finish. What is this speed in km/h
Answer:
54 km/hr
Explanation:
m/s to km/hr => 18/5
15 m/s to km/hr => 15 x 18/5 =>3 x 18 => 54km/hr
any three difference between distance and displacement
Answer:
1.) distance is always positive while displacement can be negative as well.
2.) distance cannot be 0 but displacement can be 0.
3.) distance is a scalar quantity while displacement is vector quantity.
Câu 2 : Một vật dao động điều hòa với phương trình : x = 5cos(4πt – π/3) (cm)
a. Xác định : li độ cực đại, chu kỳ, tần số, pha ban đầu của vật ?
b. Xác định li độ của vật tại thời điểm t = 0 và t = 2 (s)
Li độ cực đại x=A=5 cm
Chu kỳ T= [tex]\frac{2\pi }{4\pi }[/tex] = 0.5s
Tần số f= 1/T = 2Hz
Pha ban đầu = -π/3
x(0) = 2.5cm
x(2)= 2.5cm