Answer:
negative acceleration describes a decrease in velocity over time. Acceleration is an increase and zero acceleration is no change in velocity.
Explanation:
Can someone plz help me? :(
Answer:
b
Explanation:
1
A student is testing a solid material to determine whether it is a pure substance or a mixture.
Which absensation would MOST likely indicate that the material is a mixture!
Answer:
The material has crystals of two different colors.
35. A line graph uses_ on the x-axis
a. categories
b. time
C. dependent variable
d. control group
What do you think of when you hear the word science? How would you define it?
Food X was tested with Iodine solution; it did not turn blue black. Which food nutrient was being tested?
Covert 313.0 K to Celsius
Answer:
39.85
Explanation:
Answer:
313 Kelvin (K) = 39.850 Celsius (C)
1 K = -272.150 C 1 C = 274.150 K
3. If you started with a sample of 600 radioactive nuclei, how many would
remain undecayed after three half-lives?
Answer:
[tex]\boxed {\boxed {\sf 75 \ radioactive \ nuclei}}[/tex]
Explanation:
Radioactive decay occurs in unstable atom nuclei. The ratio of protons to neutrons is off, causing the instability. The nuclei release particles and radiation to change into different atoms.
The half-life is the time it takes for half of the nuclei to decay. We don't know the half-life of the sample, but we know it undergoes 3 half-lives. Therefore, the number of radioactive nuclei halves every time the sample undergoes a half-life.
We can divide the number of nuclei in half 3 times to find the amount left after 3 half-lives.
1st half-life: 600/2 = 300 2nd half-life: 300/2 = 150 3rd half-life: 150/2= 75After 3 half-lives, 75 radioactive nuclei remain undecayed.
16. Mass = 10g
SA
Start: 30ml
Final: 50ml
What is the Volume?
What is the Density?
Actual volume=Final Volume-initial volume
[tex]\\ \sf\longmapsto 50ml-30ml=20ml[/tex]
Now
[tex]\\ \sf\longmapsto Density=\dfrac{Mass}{Volume}[/tex]
[tex]\\ \sf\longmapsto Density=\dfrac{10}{20}[/tex]
[tex]\\ \sf\longmapsto Density=2g/ml[/tex]
Why Farmers kill the silkworm inside the cocoon .
Answer:
It allows the completion of the metamorphosis of the silkworm to its moth stage, whereas most silk harvesting requires the silkworms to be killed in their cocoon stage. No animals suffer or die for the silk to be produced, making it a favorable alternative to normal silk for those who do not believe in harming animals.
what happens when tin II chloride is reacted with iron III sulphate
Answer:
it changes from Lower temperature to higher temperature
Sofia is trying to find the density of a 25.0 g irregularly shaped solid. She filled a graduated cylinder with 25.0 mL of water. After adding the solid the water rises to 56.5 mL. What is the density of the solid? Does this solid float or sink in water
Answer: Density: 0.794 g/ml. It would float.
Explanation: The mass of 25.0 grams displaces (56.5 - 25.0) = 31.5 ml of water, it's volume (when submerged). Density is mass per unit volume:
25.0 grams/31.5 ml = 0.794 g/ml
Water's density is 1 g/ml, so this obect would float. (Don't ask me why it displaced 31.5 ml. It won't unless it is pushed down, then the volume of the finger needs to be determined and subtracted from the calculated volume.
Jupiter's moon Europa orbits the planet at a distance of about 671,030 km. What is the correct way to write this distance in scientific notation?
A. 67.103 x 10-4 km
B. 67.103 x 104 km
C. 6.7103 x 105 km
D. 6.7103 x 10-5 km
Answer:6.7103x10^5 km
Explanation:
The planet is at a distance of about 6.71030 ×10⁵ km. Therefore, option (c) is correct.
What is scientific notation?Scientific notation is a way of representing a quantity as a number having significant digits that are necessary for a specified degree and multiplied by ten to the power.
The general form of scientific notation can be written as [tex]N \times 10^{a}[/tex].
A significant digit is that digit in a number which adds to its precision. A significant includes all nonzero numbers, zeros between significant digits, and zeros represent to be significant while leading and trailing zeros are not significant digits as they exist only to represent the scale of number.
Given, using the scientific notation method we can write the scientific notation of the distance of 671,030 km.
The number 671,030 km can also be written as 6.71030 ×10⁵ km.
Therefore, the correct way to write this distance in the scientific notation of 671,030 km is 6.71030 ×10⁵ km.
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CAN SOMEONE PLEASE HELP ME OUT !!!
Answer:
133242535455555555555555
Explanation:
Atomic Mass is the ___________ of the mass numbers of all the isotopes of an element.
Answer:
Number of proton + No of electron
Explanation:
Mark me brainlist
Answer:
No of neutron + no of protons
Explanation:
Since atomic mass is the sum total of the neutron and mass number then we can say that, neutron number plus proton number is the mass number of all isotopes.
Which one is NOT the name of a measurement system? (1 Point) International System of Units Metric System Spanish System British System
Spanish System is not the name of a measurement system
WHAT IS MEASUREMENT SYSTEM?
Measurement system are standard systems that are made up of collection is of units of measurement and guiding rules. Measurement system relates numerical values to physical quantities. There are three major system of measurements in use, they are:The international system of units (S.I units)The metric systemThe British imperial systemHence, Spanish System is not one of the names of measurement of systems.
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34. Explain how dimensional analysis is used to solve
problems.
By understanding conversion factors and how they are related to each other we can use dimensional analysis to solve problems.
Dimensional Analysis is a step by step approach to solving problems in Physics, Chemistry , and Mathematics. It involves having a clear knowledge and understanding to be able to convert a given unit to another in the same dimension using conversion factors and knowing how they are related to each other.
For instance, In Chemistry, we want to Convert 120mL to L.(note that ml stands for millilitres and ;L stands for litres)
Or first approach will be to write out the conversion factor related to our problem which is
1000ml =1L
such that 120ml = (we cross multiply))
giving us 120ml x 1L/1000ml =0.12L
This same process is applied to convert any type of dimensional analysis problems be it physics or mathematics.
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1. What is the Charlotte?
A. A train
B. A car
D. An airplane
C. A ship
Answer:
B is the Charlotte
Explanation:
it is Charlotte because it has 4 wheels
B
Answer:
B. a car is a charlotte
Explanation:
because it has four wheels
Which measurement has 2 significant figures? *
0.00601 m
O
0.00600 m
0.00066 m
0.006060 m
0.006006 m
Answer:
[tex]0.00066[/tex]
Explanation:
Any number is significant if;
» It is before the decimal point. i.e; 1.000 [1 is a significant figure] and all other values will be significant. Hence the value has 4 signigicant figures.
» It is non-zero value, and when it is after a decimal point. i.e; 0.1, 0.01, 0.0001 [1 is the significant figure]. Hence each value has one significant figures.
» It is after any non-zero value, that comes after a decimal place. i.e; 0.00100 [the last two zeros are significant]. Hence the value has three significant figures.
Summary :
• 1.00 » three significant figures. ( 1 only )
• 0.01 » one significant figure. ( 1 only )
• 0.010 » two significant figures. ( 1 and last zero )
• 0.01006 » four significant figures (1, last two zeros, and 6)
• 0.00066 » two significant figures ( 6 and 6 )
A skateboarder moving at 2 m/s starts skating down a ramp. As the skateboarder heads down the ramp, he accelerates to a speed of 6 m/s in 4sec onds. What is the skateboarder’s acceleration?
Answer:
1 meter per second is acceleration
What is true about protons within an atom?
Select all that apply.
O They are negatively charged.
O They are equal to the atomic mass.
O They are equal to the atomic number.
O They are positively charged.
Answer:
They are positively charged
Explanation:
Hope it will help you
Protons are the sub-atomic particles present within the nucleus of the atom. The protons determine the atomic number and carry a positive charge. Thus, options c and d are correct.
What are protons?Protons have been discovered as the smallest unit or particle of the atom. They are present in the nucleus of the atom situated in the middle along with the neutrons. The protons alone are the characteristics to determine the atomic number and property of the element in the periodic table.
The protons have also been discovered to have a positive charge (+1) on them that binds the atom and electron by the attractive forces. They are heavier than the other particles and are the determinant of the chemical element.
Therefore, options c and d. protons are equivalent to atomic numbers and carry a positive charge is correct.
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Is a mixture of stones?
homogeneous or heterogeneous
Answer:
Heterogeneous mixture because it is not soluble and in non uniform texture.
ventilator should be kept in our room give reasons of science
Answer:
Ventilators are provided in the rooms at the top of the roofs because if the air inside the room gets hot, the hot air rises up and flows through these ventilators and thus cool air remains at bottom. Thus ventilators maintain conventional currents to keep the air fresh in the room.
Explanation:
Use the information from the diagram to calculate the enthalpy of combustion for methane.
(IGNORE MY ANSWER PLZ I ACCIDENTALLY CLICKED IT)
SOMEBODY PLZ HELP ME I REALLY NEED IT PLZZZZZZZZ
Answer:
The answer is A) -604KJ
Explanation:
I just took the Penn Foster test. =D you welcome!
How would you find the mass of an object from its density and volume ?
Answer:
Mass= volume x density
Explanation:
Multiply the density by the volume.
Express the following numbers in their expanded forms
2.24 x 10⁵
1.5 x 10‐⁹
6.55 x 10‐¹
9 x 10³
Calculate the volume of an object with dimensions measuring: 3.0cm x 4.0cm x 1.0cm
Answer:
12cm^3
Explanation:
Just multiply each of the given dimension.
= 3.0 × 4.0 × 1.0
= 3 × 4 × 1
= 12
Answer:
12cm cubed
Just multiply 3, 4, and 1
How do i calculate moles to atoms/atoms to moles?
Answer:
To convert from moles to atoms, multiply the molar amount by Avogadro's number. To convert from atoms to moles, divide the atom amount by Avogadro's number (or multiply by its reciprocal).
Explanation:
What is the density of an object if it’s mass is 88.69g and it’s volume is 24.5mL?
What's larger centimeter or meter?
Answer:
A meter is 100 times larger then a centimeter
If you have 48 ounces of eggs, how many dozens of eggs do you have?
