The ionic compound property useful for writing on the chalkboard is hardness and brittleness
Information regarding the compound:Chalk should be an ionic compound. If there is hardness and brittleness so it is useful for writing on the chalkboard. But for other reasons like high melting point, dissolving in water does not impact it.
Therefore, the above option should be considered.
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Answer:hardness and brittleness
Explanation: im doing the same thing rn
Physical Science
convert 5.3 hl to dal
Answer: 53 dal
Explanation: 5.3x10=53, to get dal you have to multiply by 10 to get 5.3x10=53.
Hope this helped! Please mark Brainliest!
20 POINTS! ANSWER CORRECTLY FOR BRAINLIEST!
Which of these is a similarity between a polar and a subtropical jet stream?
A. Both are formed at latitudes close to the poles.
B. Both are formed at latitudes close to the equator.
C. Both are formed at the boundary of warm and cool air masses.
(D not included because I know for a fact it is incorrect, I honestly think the answer is C but I just want other peoples opinions)
Answer:
C, Both are formed at the boundary of warm and cool air masses.
Answer:
c
Explanation:
A biker starting from rest reaches a final speed of 3.0 m/s in 3 seconds. What is the acceleration of the biker?
Answer:
1 m/s²
Explanation:
Given:
v₀ = 0 m/s
v = 3.0 m/s
t = 3 s
Find: a
a = (v − v₀) / t
a = (3.0 m/s − 0 m/s) / 3 s
a = 1 m/s²
The Concord jetliner achieves a lift-off speed of 112 m/s in 20.0 seconds, starting from rest and traveling due east. What is the magnitude and direction of the average acceleration?
Answer:
5.6 m/s
Explanation:
The acceleration of any possible is the ratio of the velocity of the particle with respect to the time the particle takes in moving. It is mathematically represented as
a = v/t, with m/s² as it's unit, where
v = velocity in m/s
t = time taken in seconds
a = acceleration in m/s²
From the explanation above, we were given in the question that, the speed is 112 m/s and the time if took is 20 seconds, thus, the acceleration is
a = 112/20
a = 5.6 m/s²
Therefore, the magnitude of the acceleration is 5.6 m/s²
A square sheet of rubber has sides that are 20 cm long. What is the area of the square of rubber in cm squared?
Area of the square of rubber =?
Answer:
400cm^2
Explanation:
sides are 20cm long Area for a square is a squared
since all the lides are of equal length you can just choose one side.
20squared is 400
20 x 20 = 400cm squared
Hope this helps :)
A car travels at a constant 1km per hour in the positive direction down a straight line highway. What is the displacement of the car 45 seconds later?
Explanation:
1 km/hr × (1000 m/km) × (1 hr / 3600 s) × 45 s = 12.5 m
Two grocery carts have the same initial total momentum. The two carts collide, and now cart B has a greater final velocity.
Which best describes the final total momentum of both the carts compared to the initial total momentum?
It is less if cart B has a smaller mass.
It is greater if cart B has a greater mass.
It is the same if no external forces are added.
It depends on the masses of cart A and cart B.
Answer: The anser is C
Explanation:
It is the same if no external forces are added.
Based on the principle of conservation of linear momentum, the final total momentum of both carts compared to the initial total momentum is the same if no external forces are added.
The given information;
two carts have equal initial momentum beforeafter collision, cart B has greater final velocityAccording to the principle of conservation of linear momentum, the total momentum before collision is equal to the total momentum after collision.
m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂
where;
m₁ and m₂ are the masses of the two cartsu₁ and u₂ are the initial velocities of the two cartsv₁ and v₂ are the final velocities of the two carts after collisionThus, based on this principle (conservation of linear momentum), the final total momentum of both carts compared to the initial total momentum is the same if no external forces are added.
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A race car accelerates from 0 m/s to 20.0 m/s with a displacement of 35.0 m. What is the vehicle's acceleration?
a 5.7 m/s2
b .84 m/s2
c 6.1 m/s2
d .29 m/s2
Explanation:
Using Equations of Motion :
[tex] {v}^{2} = {u}^{2} + 2as[/tex]
[tex]a = \frac{{v}^{2} - {u}^{2}}{2s} = \frac{400 - 0}{70} = 5.71msec^{ - 2} [/tex]
What is the mean of 4, 6, 8, 20, 12?
10
00
5
Answer:
mean= sum of all values/ total no. of values
values given= 4,6,8,20,12
= 4+6+8+20+12/5
=50/5=10
HOPE IT HELPS
PLZ MARK AS BRAINLIEST
The word “cumulative” means that something builds on itself. Which example best shows how scientific knowledge is cumulative? A. Watson and Crick worked together to come up with the model of DNA. B. Kepler based his laws of planetary motions off of Newton’s law of gravity. C. Hardy and Weinberg independently came up with a population equation. D. Darwin and his grandfather both worked on the ideas of survivability.
Answer:
B
Explanation:
Kepler embodied cummulative knowledge(succession).
Answer:
your answer is B
Explanation:
i got it right lovely's
Bacteria prefer a dry environment to a damp or moist environment. False True
Answer:
false
Explanation:
cause bacteria prefers moist and damp environment
Answer:
False
Explanation: bacteria thrive on moister and grow due to it. if the enviroment they were in were to be dry, the bacteria itself would die. Hope this helps! :)
A current of 5A flows round a circuit in 2 minutes. How much charge flows round
the circuit in this time?
Answer:
just multiply 2 time 5 a
Explanation:
A ball is thrown upward. The total time the ball remains in the air is 14 s. a) With what speed was the ball thrown upward? b) What is the maximum height reached by the ball?
Answer:
a) Vi = 137.2 m/s
b) h = 960.4 m
Explanation:
a)
In order to find the initial speed we will use first equation of motion:
Vf = Vi + gt
where,
Vf = Final velocity = 0 m/s (since ball stops at highest point)
Vi = Initial Velocity = ?
g = - 9.8 m/s² (negative sign for upward moyion)
t = time interval = 14 s
Therefore,
0 m/s = Vi + (-9.8 m/s²)(14 s)
Vi = 137.2 m/s
b)
Now, we use second equation of motion to find height (h):
h = Vi t + (1/2)gt²
h = (137.2 m/s)(14 s) + (1/2)(-9.8 m/s²)(14 s)²
h = 1920.8 m - 960.4 m
h = 960.4 m
If you run 12 km at an average speed of 4 km/h, how
much time does it take?
Answer:
3 hours, I think
Explanation:
Answer:
3
Explanation:
Identify which type of source is being described.
sources present original research, whereas
sources summarize scientific
information.
Answer:
Primary, secondary
Explanation:
Answer:
Identify which type of source is being described.
✔ Primary
sources present original research, whereas
✔ secondary
sources summarize scientific information.
Second Part----
Indicate whether each of the following is a primary source or a secondary source.
An article in Journal of the American Medical Association:
✔ primary source
An article in Time magazine:
✔ secondary source
An article in The New York Times newspaper:
✔ secondary source
Explanation:
Just did the problem.
__________ is a severe condition that occurs from extreme exposure to the sun.
A. Heat stroke
B. Bulimia
C. Hypothermia
D. Sun burn
Answer:
Heat stroke
Explanation:
i need help i don’t understand
Answer:
precise
Explanation:
im pretty sure
Why us an element considered a pure substance
Explanation:
Hey there!!
An elements is called a pure substance because it is composed of only one kina of atoms in a fix proportion.
Hope it helps...
Answer:
Elements are pure substances because elements are always made up of same kind of particles.
Example:- pure Iron rod (iron is an element)is made up of many similar Iron atoms.
A runner decreases his velocity from 20 m/s to 10 m/s in 2.0 s.
What was his average acceleration?
We have that the average acceleration is
[tex]a=5m/s^2[/tex]
From the Question we are told that
Decreases his velocity from 20 m/s to 10 m/s in 2.0 s.\
Generally the equation for the average acceleration is mathematically given as
[tex]a=\frac{u-v}{t}\\\\a=\frac{20-10}{2}[/tex]
[tex]a=5m/s^2[/tex]
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The gravitational force between two objects is 3600 N. What will be the gravitational force between the objects if the mass of each object is reduced to one third of its original mass
A. 400 N
B. 1200 N
C. 10,800 N
D. 32,400
Answer:
It will reduce by 9 times and become 400 N.
This question can be solved using the concepts of Newton's Law of Gravitation, and gravitational force.
The gravitational force between the two objects if the mass of each object is reduced to one-third of its original mass will be "A. 400 N".
According to Newton's Law of Gravitation the gravitational force between two objects is given as follows:
[tex]F = \frac{Gm_1m_2}{r^2}[/tex]---------- eqn (1)
where,
F = Gravitational force between objects = 3600 N
G = Universal gravitational constant
m₁ = mass of the first object
m₂ = mass of the second object
r = distance between the objects
Now, the masses have become one-third of the original value:
[tex]F'=\frac{G(\frac{m_1}{3})(\frac{m_2}{3})}{r^2}\\\\F' = \frac{1}{9}\frac{Gm_1m_2}{r^2}\\\\using\ eqn\ (1):\\\\F' = \frac{F}{9} = \frac{3600\ N}{9}\\\\[/tex]
F' = 400 N
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The attached picture illustrates Newton's Law of Gravitation.
Can anyone help me please?
Answer: 2 PARAGRAPH ESSAY
Explanation:Flexibility and stretching: preventing sports injuries
Many may know about all the different types of sports around the world. Lots can leave serious injuries. All across the world more than 1.2 million people have been injured because of sports or maybe more than that. Most of the injuries have been kids. To prevent these injuries from happening. One thing is stretching if you don’t stretch your bones more than likely you are not into your flexibility and reflexus that for they are very weak. If there is not enough flexibility within your movement you are more than likely not able to stretch. It can help the growth within your bone as well. If you have growth in your bones then you will get less injuries. If you break a bone such as your leg or sprain there is a chance that you will have problems with that specific leg later on in life. To prevent these types of events from happening I say stretch before a sporting game. Stretching can help with the impact of your flexibility. For example, Olympic gymnasts are able to do lots of tricks because their bones have flexibility in their bones. That's not saying that they will not hurt themselves, it's just such a low risk because their bone grew strength and flexibility. Some people's bones can be very sensitive then others so it might be kind of hard for them to be flexible. Another way to help people with their bone flexibility is drinking milk. Milk helps grow your bones. This can help prevent sport injuries in many ways. Lots of people get hurt in football to be more specific because it's such a durable sport as in tough. If they drink a lot of protein and milk before a game maybe even Carbohydrates their bones will be ready for the game. Flexibility and stretching can go lots of ways when it has to do with your body. JUST STAY FIT
Which statement explains why carbon 14 dating cannot be used to date ancient rocks
Answer:
Carbon-14 decays relatively quickly
Explanation:
i took the test
b. Study the given figure and calculate the area of the leaf
Area of each square
=1 cm, help me;-)
Answer:
19 cm sq
Explanation:
you have to count one full and half area occupied by leaf in each box, then you have to multiply with 1 cm sq.
The nucleus of most atoms is composed of which of the following sub-atomic particles?
Answer:
protons (+ charge) & neutrons (neutral charge)
however protons has a positive charge so it determined what atom it is.
Answer:
tightly packed protons and neutrons
Explanation:
Please help Give relationship among centigrade, fahrenheit and kelvin scale
The basic formula is °C + 273.15 = K. The basic formula for converting Fahrenheit into Celsius is (°F − 32) × 5/9 = °C. To convert Fahrenheit degrees into Kelvins, (°F − 32) × 5/9 + 273.15 = K.
11. If humans continue to divert water from rivers for crops, drinking and industry, what parts of the water cycle are most affected?
A. Runoff and Accumulation
B. Evaporation and Transpiration
C. Evaporation and Precipitation
A cargo with a mass of 50 kg can withstand a maximum velocity of 26 m/s. If dropped on the moon, where the acceleration due to gravity is -1.6 m/s2, how long will it be in free fall?
Record your answer as a positive number (because time cannot be negative) and round to the whole number.
You do not need to include units.
Wouldnt the answer be 1.6 m/s²?
I am sorry if its not.
Question 2 of 10
Which statement best describes how vomiting can help an animal maintain
homeostasis?
A. It keeps the animal's body temperature within a certain range.
B. It rids the body of something harmful.
C. It prompts the animal to eat healthy food.
D. It uses up excess energy in the body.
Answer:
I would say B. It rids the body of something harmful.
Explanation:
Vomiting usually tries to get rid of something bad in your stomach. If you vomit when your sick its because its trying to get rid of that sickness.
Hope this helps >:3
Answer:
B. It rids the body of something harmful.
Explanation:
PLEASE HELP!!!
Elements located in the vertical column of the periodic table are of the same _______ and have _______ chemical properties.
A. group
B. period
C. similar
D. different
E. style
F. unlike
Answer:
I think its A & C
Explanation:
The vertical columns on the periodic table are called groups or families because of their similar chemical behavior.
Elements located in the vertical column of the periodic table are of the same group and have similar chemical properties, therefore the correct answer is option A and option C.
What is the atomic number?The total number of protons present in an atom is known as the atomic number of that atom.
While the atomic mass of an atom is the sum of the total number of protons and the number of neutrons present inside any atom.
The element belonging to the same group have approximately similar chemical behavior while on the other hand element belonging to the same period would have the same outermost shell.
The correct response is option A and option C because elements included in the vertical column of the periodic table belong to the same group and have comparable chemical characteristics.
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The number of proton in a atom of 3H1 is
Answer:
5th hhssjn wixi. sjxbwjs. bajz wjxhqjzisjnisja
Answer:
the answer is 1
Explanation: