Answer:
I think another group who didn't receive ice creams
An object of mass 10kg whirled round in a horizontal circle of radius 4m by a revolving
String inclined to the vertical. If the uniform speed of the object is 5m/s.Calculate the tension of the string.
Answer:
114N is correct answer.
Manganese-56 decays by beta emission and has a half-life of 2.6 hours. How many half-lives are there in 24 hours? How many mg of a 20.0 mg sample will remain after five half-lives?
Explanation:
Given that,
Manganese-56 decays by beta emission and has a half-life of 2.6 hours.
We need to find no of half lives in 24 hours. It can be calculated by dividing 24 hours by 2.6 hours. So,
[tex]T=\dfrac{24}{2.6}=9.23\ \text{half lives}[/tex]
Let x mg of a2 0 mg sample remain after 5 half-lives.
[tex]x=20\ mg\times \dfrac{1}{2^5}\\\\x=0.625\ \text{mg}[/tex]
Hence, there are 9.23 half lives and 0.625 mg of sample will remain after 5 half lives.
What is the definiton of reflection
the throwing back of your body or surface of light,heat,or sound without absorbing it.
Explanation:
"the reflection in a mirror"
Answer:
abrupt change in the direction of propagation of a wave that strikes the boundary between different mediums. At least part of the oncoming wave disturbance remains in the same medium. Regular reflection, which follows a simple law, occurs at plane boundaries
Which physical property is used to be Indentify the ability to dissolve
Answer:
solubility
Explanation:
solubility is a measure of how much a substance will dissolve in a solvent.
Mark as brainliest if you answer it right.
Samantha noticed her hands get colder in winter than other exposed parts of her body such as her face and neck.
Why would a scientist want to identify this species of spider? Check all that apply. to be certain that it is a spider to compare it to similar spiders to determine the relationship it has with other organisms to determine if the spider is safe to handle or not to find out how many offspring it has had this year
Answer:
-To compare it to similar spiders
-To determine the relationship it has with other organisms
-To determine if the spider is safe to handle or not
Explanation:
Answer: 2 3 4
Explanation:
What is an isotope?
A. atoms of the same element that have similar chemical properties but have different
numbers of protons
B.atoms of the same element that have similar chemical properties but have different
numbers of electrons
C. atoms of the same element that have similar chemical properties but have different
numbers of neutrons
Answer: C.
Explanation:
They are the same elements that contain same number of protons, but different numbers of neutrons.
Calculate the volume of a substance if the mass is 30 g and the density is 3.0 g/ml
S H O W A L L C A L C U L A T I O N S
Which is the largest in size? OA. A. a star O B. a planet O c. an asteroid D. a galaxy E. a supernova E.
Answer:
galaxy
Explanation:
galaxy is the largest in size
Why are do some substances have larger or smaller densities than others?
Answer:
What is the particle model of matter?
How small are atoms and molecules?
How does the particle model of matter describe solids, liquids and gases?
How does the particle model of matter help us understand the process of diffusion?
How can materials be made to change their state?
How does the particle model of matter help us to understand changes of state in materials, such as melting, evaporation, condensation and freezing?
How are density, mass and volume related to each other?
How do the densities of solids, liquids and gases compare?
Which aspects of the particles in a given material influence the density of that material?
Why does oil float on water? Is this related to density?
How can the particle model of matter help us to understand expansion and contraction?
How does a gas exert pressure?
Is the pressure a gas exerts related to the number of gas particles? If so, how?
What happens to pressure when we change its volume and temperature?
Can you remember learning that matter can exist in three different states? What are the three states called?
Can you remember the properties of the different states of matter? Discuss this in your class. Look at the following diagram of the states of matter to help you. Remember to take some notes as you discuss in class.
Each state of matter behaves differently and the particles in each state behave differently. This diagram compares the particles in a gas, a liquid and a solid.
In this chapter we are going to review what we know about solids, liquids and gases. We are going to learn about a scientific model that can be used to describe how the particles in all three states behave. This model is called the particle model of matter and it will help us understand much more about the properties of solids, liquids and gases. Let's get started!
What is the particle model of matter?
scientific theory
phenomenon
disordered
uniform
random
reverse
controlled experiment
In the previous chapter we learnt that scientists use models when they want to describe things that are difficult to understand. We discussed a model of the atom that helped us to imagine what atoms look like.
This model of the atom shows us where the different sub-atomic particles can be found. The sub-atomic particles shown here are the proton, neutron and electron.
Theories are similar to models. They explain scientific phenomena (things and events that can be described and explained in scientific terms) using pictures and words.
What does the particle model of matter teach us?
The particle model describes matter in a very specific way. It describes four important aspects of matter:
All matter is made up of particles that are incredibly small - much too small to see with the naked eye. The particles can be atoms or combinations of atoms that are bonded.
There are forces between the particles.
The particles in matter are always moving. The more energy they have, the faster they move.
The spaces between the particles in matter are empty. You might assume that the spaces between particles are filled with air, but this is not the case. They contain nothing at all.
If you need to, turn back to chapter 1 to revise the terms atom, element, compound and molecule and how they relate.
Why is the particle model of matter so useful?
The particle model of matter is one of the most useful scientific models because it describes matter in all three states. Understanding how the particles of matter behave is vital if we hope to understand science!
The model also helps us to understand what happens to the particles when matter changes from one state to another.
The following diagram shows different changes of state, as well as which processes are the reverse of each other. Melting and freezing are the reverse processes of each other and so are evaporation (boiling) and condensation.
Under special circumstances, a solid can change directly into a gas without melting first. This process is known assublimation and its reverse (when a gas changes directly into a solid without condensing first) is called deposition.
The volume of a rock sample is 8 cm3 and its density is 2 g/cm3 . What is the mass of the rock sample?
Answer:
The answer is 16 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
volume of rock = 8 cm³
density = 2 g/cm³
The mass of the rock is
mass = 2 × 8
We have the final answer as
16 gHope this helps you
Answer:
16g
Explanation:
The formula is [ m = dv ] where d = density and v = volume.
m = 8 * 2
m = 16
Best of Luck!
how to find out number of protons , neutrons and electrons?
Answer:
The number of protons in the nucleus of the atom is equal to the atomic number (Z). The number of electrons in a neutral atom is equal to the number of protons. The mass number of the atom (M) is equal to the sum of the number of protons and neutrons in the nucleus
When the mass of the boron atom is calculated, the mass of the electrons is ignored. Why is the mass of the electrons ignored?
Answer:
Because electron mass is so insignificant compared to proton and neutron mass that it can be ignored.
Explanation:
How are pure substances and mixtures different
Rewrite the following chemical formula in dissociated ion form.
KI (aq)
A. K+ + I-
B. K2+ + I2-
C. K+ (aq) + I- (aq)
D. K2+ (aq) + I2- (aq)
plz hurry
Answer:
Explanation:
KI (aq)+ H2O(l) ----- K +1 (aq) + I - 1 (aq)
Why are scientific models important in the study of science
Answer:
Models are important in the study of science because they explain a scientific phenomenon that is not directly experienced.
Explanation:
A Model in science is an idea, a process or a system applied by scientists to test hypothesis of a certain phenomenon in study. A model can be used to predict information using the data obtained. However, it is important to mention that after testing a model , a scientist can improve it using new data obtained in the area of study. Models are therefore a vital part of scientific research and the results communicated when explaining a phenomenon.
The initial mass of a radioisotope is 15.0 g. If the radioisotope has a half-life of 2.75 years, how much remains after four half-lives?
Answer:
0.9375 grams
Explanation:
As we know half life is the time period in which quantity of a substance reduces to half of its original value.
The formula to calculate amount of substance left after n half life is [tex]x/2^n[/tex]
where x is the amount of original substance
n is the no of half life.
_________________________________________
Given
No. of half lives = 4
amount of original substance = 15 gram
thus,
n = 4
x = 15 grams
amount of radioisotope left after 4 half life = [tex]x/2^n = 15 \ gram/2^4 = 15 \ grams / 16 = 0.9375 \ grams\\[/tex]
Thus, only 0.9375 grams of radioisotope are left after 4 half lives.
Name given to the type of microscope that only has one lens.
Answer:
simple microscope has only one lens
:)
Based on the Law of Conservation of Matter, why do you think the weight of Steel Wool would change the way it did?
Answer:
Because matter cannot be destroyed or created, It can change form through physical, chemical changes but the matter never gets destroyed or created.
Explanation:
WILL AWARD BRAINLIEST HELPPPP
What is the density of an object that weighs 14.5g and has a volume of 0.99cm^3
Answer:
The answer is
14.65 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass of object = 14.5 g
volume = 0.99 cm³
The density of the object is
[tex]density = \frac{14.5}{0.99} \\ = 14.64646464...[/tex]
We have the final answer as
14.65 g/cm³Hope this helps you
Answer:
14.65 g/cm³
happy to help ya
Explanation:
The density of aluminum is 2.70 g/mL. If you use 108 g of aluminum foil, what is its volume in mL?
Question 13 options:
0.642 mL
292 mL
40.0 mL
2.50 mL
Answer:
volume =40.0 ml
Explanation:
density = mass/ volume
volume = mass/ density
volume = 108/ 2.70
volume =40.0 ml
A 4.24 kg marble slab has the volume of 1564 cm3 What is the density in g/cm3
Answer:
The answer is
2.71 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
volume of marble = 1564 cm³
1 kg = 1000 g
4.24 kg = 4240 g
mass = 4240 g
The density is
[tex]density = \frac{4240}{1564} \\ = 2.710997442...[/tex]
We have the final answer as
2.71 g/cm³Hope this helps you
The Milky Way galaxy is described as a disk of stars orbiting a central point on the disk. Which of these best explains
why people on Earth cannot see the entire shape of the Milky Way?
A.) Many more stars exist outside the galaxy.
B.) Earth is a part of this galaxy.
C.) The stars in the center of the galaxy are extremely small.
D.) The center of the galaxy consists of a dense cluster of stars.
Answer:
b
Explanation:
Answer:
b
Explanation:
if you have a volume of 10 ml and a mass of 100 kg, what is the density.
how might the atoms that make up bones be different from the atoms that make up soft tissue?
The atoms that make up soft tissue are smaller and are incapable of absorbing X-rays while atoms that make up bones are more capable of absorbing X-rays.
X-rays belong to the electromagnetic spectrum. They are composed of high energy radiation which penetrates soft tissue but are readily absorbed by the calcium atoms in the bone.
The soft tissue are composed of smaller atoms which can not absorb X-rays. Hence, X-rays can pass through soft tissue and reach the bone where calcium atoms can absorb them quite well.
This absorption of X-rays in bones is very important in medicine.
https://brainly.com/question/2833441
Which of the following choices is a goal of science?
Answer
science aims to explain and understand
Explanation:
A train is accelerating at a rate of 11.8 m/s2. What is this rate in units of nm/ms2?
A1.18x10^-11 nm/ms^2
B1.18x10^-14nm/ms^2
C1.18x10^7nm/ms^2
D1.18x10^9nm/ms^2
E1.18x10^4nm/ms^2
Answer:
E. 1.18x10^4nm/ms^2
Explanation:
The aceleration of the train is given in m/s². We need to conver, first, the meters to nm and then, the seconds to ms as follows:
11.8m/s² * (1x10⁹nm / 1m) = 1.18x10¹⁰nm / s²
Now, as 1s is equal to 1000ms:
1.18x10¹⁰nm / s² * ((1s)² / (1000ms)²)) =
1.18x10⁴nm / ms²
Thus, right option is:
E. 1.18x10^4nm/ms^2Please help ASAP please
Answer:
3
Explanation:
Number of Energy Levels: 3
First Energy Level: 2
Second Energy Level: 8
Third Energy Level: 7
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Placing a sample of iron (ll) oxide into a graduated cylinder makes the water volume increase 12.0 mL. The weight of the sample is 76.6 g. What is its density?
Answer:
The answer is
3.83 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass = 76.6 g
volume = 12 mL
The density of iron (ll) oxide is
[tex]density = \frac{76.6}{12} \\ = 6.38333333...[/tex]
We have the final answer as
6.38 g/mLHope this helps you
Answer:
he answer is
3.83 g/mL
Explanation:
The density of a substance can be found by using the formula
From the question
mass = 76.6 g
volume = 12 mL
The density of iron (ll) oxide is
Explanation:
An atom has the following three isotopes: 24 amu (percent abundance = 78.99%)25 amu (percent abundance =10.00\%) , and 26 amu (percent bundance=11.01\%) . Calculate the average atomic mass. What is the identity of this atom based on your calculation?
1. The average atomic mass of the element is 24.32 amu
2. The identity of the atom is Magnesium (Mg)
Let the 1st isotope be A
Let the 2nd isotope be B
Let the 3rd isotope be C
From the question given above, the following data were obtained:
For Isotope AMass of A = 24 amu
Abundance of A (A%) = 78.99%
For Isotope BMass of B = 25 amu
Abundance of B (B%) = 10%
For Isotope CMass of C = 26 amu
Abundance of C (C%) = 11.01%
Average atomic mass =?The average atomic mass of the atom can be obtained as follow:
Atomic mass = [(Mass of A × A%)/100] + [(Mass of B × B%)/100] + [(Mass of C × C%)/100]
= [(24 × 78.99)/100] + [(25 × 10)/100] + [(26 × 11.01)/100]
= 18.9576 + 2.5 + 2.8626
= 24.32 amu
Therefore, the atomic mass of the atom is 24.32 amu.
From the periodic table, the element having atomic mass of 24.32 amu is Magnesium (Mg).
Therefore, the identity of the atom is Magnesium (Mg)
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