In the winter, people often buy large bags of rock salt to sprinkle on their walkways. Why do people do this?
Answer:
It helps melt the ice away on their walkway.
Explanation:
The salt makes the ice to freeze at a lower temperature. So when a solute (salt) comes into contact with the ice the freezing point is lowered.
Why in the absence of air do all objects fall at the same rate?
Answer:
objects falling at same rate.
Explanation:
ifif you neglect air resistance, objects following your Earth's surface or with the same approximate acceleration 9.8 meters per second squared (9.8 m/s^2, or g) due to Earth's gravity.
Select the correct answer.
Which phase in the cell cycle consists of the cell readying itself for its division?
A.
Prophase
B.
Interphase
C.
Anaphase
D.
Metaphase
Answer:
A
Explanation:
The phase of cell cycle consists of the cell readying itself for its division is called prophase of the cycle. It is the first phase in mitosis at which a cell duplicate into two daughter cells.
What is cell cycle?Cell cycle is a biological process by which a cell divide into two genetically identical daughters cells. Prophase is the initial stage of cell division in both mitosis and meiosis. When the cell reaches prophase, DNA replication has already started after interphase.
The chromatin reticulum condenses and the nucleolus vanishes during prophase, which are the key events. Other phases are interphase, anaphase etc. and the last stage is called the telophase.
Cell cycle is a very important biological process by which organisms are producing their offspring. This process differ in each level of organism where for all the starting phase is called prophase.
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What is the wave speed of a 1,000 Hz wave with a wavelength of 0.04 m?
Wave speed = 40 m/s
Explanation:
Wave speed = frequency x wavelength
Wave speed = 1000 * 0.04
Wave speed = 40 m/s
Someone please help me!!!
Answer:
i don’t understand
Explanation:
Answer:
There's no question-
story on where there is a will there's a way
Why is there no up and down in space
Answer:
Because there is no gravity determining where you are.
Explanation:
I hope this helps
have a good day :)
Could society survive without energy transformations? Explain your reasoning.
Quick does the watermelon have more or less mass then the 2kg bottle?
Answer
it will be less\
Explanation:
a bullet of mass 25 g is fired from a pistol at a velocity of 200 m/s. if mass of the pistol is 2.5 kg calculate its recoil velocity
List three examples of familiar organisms known as plants as used in the cell
Answer:
rose
sunflower
seaweed
8. Isotopes of the same element have different
numbers of neutrons.
numbers of protons.
numbers of electrons.
atomic numbers.
C.
d.
Reese can run 10 meter in 5 seconds.What is her speed?
Answer:
2 meters per second
Explanation:
A ball is dropped off the side of a bridge after 1.55 seconds how far has it fallen (units=m)
Answer:
d = 11.77 m
Explanation:
Given that,
A ball is droped off the side of a bridge after 1.55 seconds.
We need to find how far it has fallen.
It will fall under the action of gravity. It would mean that a = g = 9.8 m/s²
Let it is fallen at a distance d. d can be calculated using second equation of motion as follows :
[tex]d=ut+\dfrac{1}{2}at^2[/tex]
Put u = 0 and a = g
So,
[tex]d=\dfrac{1}{2}\times 9.8\times (1.55)^2\\\\d=11.77\ m[/tex]
Hence, it will fall at a distance of 11.77 m.
Answer:
-11.77!!!! DONNT FORGET NEGATIVE
Explanation:
A proposed solution to a scientific prob-
lem is called a
A hypothesis and/or theory is s a proposed solution to a scientific problem.
A hypothesis is an assumption based on some basic, limited evidence for further investigation. A proposed solution to a scientific problem is called a hypothesis.
What is scientific hypothesis ?The scientific hypothesis is defined as the relationship between two or more variables or a proposed explanation for some observed process. The scientific hypothesis can happen during scientific experiment.
The good scientific hypothesis may possess a hypothesis must be testable and falsifiable. Someone must be able to test a given hypothesis through scientific experimentation.
A hypothesis is an assumption based on some basic, limited evidence for further investigation. A proposed solution to a scientific problem is called a hypothesis.
Thus, A proposed solution to a scientific problem is called a hypothesis.
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You are at the Super Bowl. The coach puts you in during the 4th quarter to be the quarterback to secure your team the win. Since you are fresh off the bench, you are able to throw the ball with more force than the last person. What advantages, using Newton's second law, will this have when playing?
Answer:
the ball will fly faster, and longer distance, which means there is going to be less air resistnace friction acting upon the ball.
Explanation:
What is electronegativity? (2 points)
An atoms ability to attract other electrons and form a chemical bond
A type of electricity only found in some atoms
The total number of electrons in an atom
A property of electrons that give them a negative charge
Answer:
the first one
Explanation:
an atoms ability to attract other electrons and form a chemical bond
since other one got deleted :(
Electronegativity is an atom's ability to attract other electrons and form a chemical bond.
What is electronegativity?The tendency of an atom of a given chemical element to attract shared electrons (or electron density) when forming a chemical bond is known as electronegativity.
The electronegativity of an atom is affected by its atomic number as well as the distance between its valence electrons and the charged nucleus. The higher the associated electronegativity, the more an atom or substituent group attracts electrons.
Electronegativity is a simple way to quantify bond energy as well as the sign and magnitude of a bond's chemical polarity, which characterizes a bond along a continuous scale from covalent to ionic bonding.
Hence, electronegativity is an atom's ability to attract other electrons and form a chemical bond.
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Convert 250 pounds to kg
Answer:
250 pound = 113 kg i guess
help pleasee i give brainliest
Answer:
A is a solid. C is a gas. In solid an liquid the particals are touching. In C, the particals have less affect on each other because they are so far apart.
I WILL MARK BRAINIEST
Answer:
i think answer b
Explanation:
A 350 kg motorcycle moves with a velocity of 30 m/s. What is its kinetic energy?
10500 Joules
c. 31500 Joules
b. 157500 Joules
d. 900 Joules
Answer:
C 31500
Explanation:
1/2mv*2=KE
k.e= 350× (30)*2
=350×900
k.e= 31500
1. A car accelerates uniformly from 12 m/s to 39 m/s in 12 seconds. What is the car's average acceleration
2. A butterfly is flying at 4 m/s. It accelerates uniformly at 1.2 m/s for 6 seconds. How far does the butterfly travel during the period of acceleration?
Answer:
(1) 2.25m/s^2
(2) 45.6m
Explanation:
(1) A car accelerates uniformly from 12m/s to 39m/s in 12 seconds
Therefore the average acceleration can be calculated as follows
a = 39-12/12
a = 27/12
a= 2.25m/s^2
(2) A butterfly is flying at 4m/s , it accelerates uniformly at 1.2 m/s for 6 seconds
u= 4
a= 1.2
t= 6
Therefore the distance can be calculated as follows
S= ut + 1/2at^2
= 4×6 + 1/2 × 1.2 × 6^2
= 24 + 1/2 × 1.2 × 36
= 24 + 1/2 × 43.2
= 24 + 21.6
S = 45.6m
Hence the butterfly travels at 45.6m
HI CAN ANYONE PLS ANSWER DIS PLS!!!!!!
Answer:
Volume of an object (L): blue 105.00, yellow 105.00, green 102.50, red 101.25
Density of an object (kg/L) Mass / Volume: blue 1, yellow 1, green 1.014, red .992
Sink or Float: blue sink, yellow sink, green float, red float
hope this helps
What happens during the RESOLUTION of this story? A) Jonathan is feeling bored because his friend moved away. B) Jonathan and Mr. Browning start playing a game of chess. C) Jonathan kicks his soccer ball over a neighbor's fence. D) Jonathan sees a chess board set up on the back porch
Answer:
The resolution is when Jonathan finds a new friend in his neighbor after his other one moves away. (B).
Explanation:
Hope this helps
Peyote contains a psychotropic drug called __________.
A.
guarana
B.
mescaline
C.
salvia
D.
dynorphins
Answer:
B. Mescaline
Explanation:
Answer:
Peyote contains a psychotropic drug called mescaline
or B
Explanation:
15. What change of state occurs when butter turns into a liquid in a hot pan?
Answer:
Physical change from solid to liquid where it is a reversible reaction as melted butter can be frozen to its original form
This is a big project that's due in like 30 minutes Explain how force (F=ma), momentum (p=mv), energy, and gravity play a part in your launching sequence. And a Drawing of your rocket (include vectors(remember arrows show direction and magnitude). Please draw this on paper
Answer:
turns on the engines that transforms the chemical energy of its components into mechanical energy that they supply to the rocket, so that the amount of chemical energy of the fuel decreases and increases the potential energy (height) and the kinetic energy (speed).
Explanation:
In this exercise we must describe what happens when a rocket is launched.
At the beginning, the whole system is at rest, the force is the weight and the normal.
At this time, it turns on the engines that transforms the chemical energy of its components into mechanical energy that they supply to the rocket, so that the amount of chemical energy of the fuel decreases and increases the potential energy (height) and the kinetic energy (speed). At this point, the system can also be analyzed by an increase in its momentum due to the impulse given by the engines, the two forms of analysis are correct and allow to find different magnitudes of the system, we must emphasize that the mass of the rocket decreases, but the rocket mass plus exhaust gases remains constant.
At that point when the rocket begins to climb, the support on the Earth decreases to zero and the Normal Force is zero.
When all the chemical energy of the engines is finished, they are released and other engines are turned on that, as the weight has decreased, can continue to give energy to the rocket to continue its increase in scientific and potential energy. In this second case, the impulse is different since other fuels are used, it is appropriate to clarify that the weight of the rocket decreases due to the loss of mass of the engines that were released and also due to the decrease in the force of gravity of the planet with height
In the attachment we can see a diagram of the moment of clearance, just after the normal force becomes zero
• The Law of Conservation of Energy states that matter cannot be created or destroyed. So
why do people say that we need to conserve energy? (5pts)
(BRAINLIEST!) Does more momentum mean more force?
Answer:
no.
Explanation:
What is the total energy equation?
Total energy = kinetic energy / potential energy
Total energy = kinetic energy * potential energy
Total energy = kinetic energy + potential energy
Total energy = kinetic energy - potential energy
Answer:kinetic
Explanation:
