60 J work does the student do on the bag.
The formula for work is as follows:-
[tex]W=F\times d[/tex]....(1)
Here, F is the force, and d is the distance moved in the direction of force.
Substitute 50 N for force and 1.2 m for distance in the equation (1) as follows:-
[tex]W=50\ N\times 1.2\ m\\\\=60\ Nm\\\\=60\ Joule[/tex]
Hence, the value of work is 60 J.
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What is the formula for Hydroxide
Answer:
OH-
Explanation:
it's consists of an oxygen and hydrogen atom held together by a covalent bond and carries a negative electric charge
3
Write the alpha decay WITH gamma emission for the following element:
92
AL
27
Answer:
Explanation:
In alpha decay alpha ray comes out . Apha ray is nothing but nucleus of helium atom whose atomic no is 2 and atomic weight is 4 . Hence in alpha decay , atomic weight reduces by 4 and atomic no reduces by 2. For gamma emission , there is no change in atomic number and atomic mass.
⁹²₂₇AL ⇒ ⁸⁸₂₅X + ⁴₂He + γ
X is Manganese .
As the frequency of electromagnetic waves increases, what happens to the wavelength?
O It increases.
O It decreases
It fluctuates.
O It remains constant.
Answer:
It decreases.
Explanation:
As the frequency of electromagnetic waves increases, the wavelength decreases.
What is frequency?Frequency defines the number of waves passing through a fixed area over a period of time. So if the time we take for the wave to pass is 1/2 second, it is usually 2 per second. If it takes 1/100 of an hour, it is usually 100 per hour.
What is an example of frequency?The definition of frequency is how often something happens. An example of blinking an eye blink 47 times in one minute. (physics) The degree to which a recurring event occurs, such as a full-wave cycle.
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How many protons in an atom of beryllium
Answer: 4
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HELP ASAP!! A pebble is dropped into a graduated cylinder and the volume rises from 25.0 mL to 31.0 mL. The mass of the pebble is 2.9g. What is the density of the pebble? (g/mL)
Answer:
The density of the pebble is 0.483g/mL (rounded), but it's 0.48333333333333 without rounding. Hope this helped! :)
Explanation:
Volume= 6.0mL Density=Mass/Volume
Mass= 2.9g
D=2.9g/6.0mL
D=0.48333333333333g/mL
or
D≈0.483g/mL
How does a scientist test their hypothesis?
Answer:
Conducting experiments and using the scientific method.
Explanation:
Scientists (and other people) test hypotheses by conducting experiments. The purpose of an experiment is to determine whether observations of the real world agree with or conflict with the predictions derived from a hypothesis. If they agree, confidence in the hypothesis increases; otherwise, it decreases.
The density of plutonium is 19.84 g/cm². What is its mass if the container has
volume of 250 cm?
Answer:
the answer is 7.936X 10⁻⁷kg.... the unit for volume must be cm³
Explanation:
we know,
ρ =m/v
given,
ρ =19.84/1000X(100)²= 1.984X10⁻⁶kg/m²
V (volume of the container means the volume of the element)=2.5 m³
NOW putting in the equation
1.984X10⁻⁶/2.5=m
or, m=7.936X 10⁻⁷kg(ANS)
thank u(i am not 100% sure but think it shoud be the answer)
Which statement best describes how the use of gasoline in a car relates to the discipline of chemistry?
The materials used come from the ground,
The gasoline undergoes a change as it burns
A car uses the gasoline to move
All parts of the car are composed of chemicals.
Answer:
The gasoline undergoes a change as it burns.
Explanation:
Just took the Unit Test review ((:
Answer:
b
Explanation:
because i said so brudda
Which of these is an example of an abiotic factor?
What are the choices? I'll answer once you tell me those
Answer:
sunlight is an abiotic factor
Explanation:
Write in a scientific notation 234.5398
Answer:
the answer is 2.34 x 10^2
What is the main source(s) of energy for all living things?
Answer:
The sun
Explanation:
All living things get energy from different sources (a cow gets it from grass, dog gets it from meat), but eventually, most energy on Earth comes from the Sun. Plants use it to perform photosynthesis, other organisms eat plants, and so on!
4. m stands for....
a) millimeter
C) centimeter
b) meter
d) Liter
Answer:
meter
Explanation:
Please check my chem answers! Due in a few minutes!
Answer:
their correct
Explanation:
your answers are correct
how many bonds are broken in 2O2
Answer:
c5mvmifvidvj8dvj9r kf9,g
Calculate the destiny of the object that has a mass of 453 g and occupies the volume of 225 cm3
A ( 2.01g/cm3
B( 5.00 g/cm3
C( 453 g/cm3
D( 228 g/cm3
density = 2.013g/cm3
Explanation:
density = mass/volume
density = 453g/225cm3
density = 2.013g/cm3
Atoms contain positive, negative, and neutral. what happens when two positively charged particles are close together?
A.They repel each other
B.They cancel each other
C.They attract each other
D.They have no effect
Answer:
they repel each other
Explanation:
A is the ans
The compound M-O-H can act both as acid or base depending upon the ionisation
enthalpy of the element M. Justify by taking elements (M) of the third period of the
periodic table.
action
Answer:
Explanation:
A compound that can act both as an acid and a base is called an amphoteric substance. A good example (based on the question) of an amphoteric substance is the Aluminium hydroxide [Al(OH)₃] where Aluminium is the "M" in M-O-H. Aluminium is in the third period of the periodic table. The reaction below shows aluminium can act both as an acid and as a base in different neutralization reactions.
As an acid
Al(OH)₃ + 3NaOH ⇒ Na₃AlO₃ + 3H₂O
As a base
3HCl + Al(OH)₃ ⇒ AlCl₃ + 3H₂O
NOTE: A neutralization reaction is a reaction between an acid and a base to give you salt and water
What is the SI unit for mass
Answer:
kilo gram
Explanation:
kilogram(kg)
Answer:
Kilogram (Kg).......
Which of the following is a single replacement reaction?
( a. Ba(OH)2 + H2SO4 → BaSO4 + 2H2O
( b. 2Mg + O2 → 2MgO
(c. H2O+ CO2 → H2CO3
(d. Zn + H2SO4 → ZnSO4 + H2
Answer:
D.
Explanation:
A. is double replacement. Ex. AX + BY -> AY + BX
B. is synthesis Ex. A + B -> AB
C. is synthesis
D. is Single replacement -> A + BX -> Ax + B
- Study definitions and examples of these and that will help.
When zinc react with sulfuric acid, then zinc sulphate is formed. Zn + H₂SO₄ → ZnSO₄ + H₂ this reaction is replacement reaction.
What is replacement reaction ?One element in a molecule is replaced by another in a chemical reaction known as a single-displacement reaction, sometimes referred to as a single replacement reaction or exchange reaction.
One element in a compound is switched out for another in a single replacement reaction. In a double-replacement process, the anions or cations of two ionic compounds are switched. In a double-replacement reaction known as a precipitation, a solid precipitate is one of the products.
One ingredient replaces another comparable element in a compound in a single-replacement reaction.
Thus, option D is correct.
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Need help with this
Answer:
C option is the correct answer
Which of the following statements concerning the sample size of an experiment is not accurate?
A. A smaller sample size decreases confidence in the accuracy of a study.
B. A larger sample increases confidence in the accuracy of a study.
C. A smaller sample size increases generalizability of a study
D. A larger sample increases generalizability of a study.
Answer:
It's actually C. A smaller sample size increases generalizability of a study
Explanation:
which is the odd one out of clay pot , chalk , steel spoon and glass bowl(with explanation)
Answer:
chalk
Explanation:
most of them are utensils
Which of the following statement(s) are true about the atoms of any element?
a) The number of protons in an atom of an element is unique to each element.
b) The number of protons and neutrons in an atom of an element is unique to each element
c) A proton in an atom of one element is identical to a proton in an atom of another element.
d) The number of protons in an atom of an element is the same for all elements.
Answer:
C
ok please mark me brainlist
which shows as evidence for a scientific claim. A- surveys of public opinion B- company advertisments C-controlled experiments D- personal websites
Answer:
A
You do not know if the advertisement is lying to you. Controlled experiments will be biased and personal websites will say what they think, not following the data & science.
Which of these would have lowest kinetic energy
Boiling water
Ice water
Refrigerated water
Water at room temperature
Answer:
The answer is ice water, since the particles of a solid have very low kinetic energy.
Explanation:
Answer:
Iced water.
Explanation:
It's a solid. Within a given substance, such as water, particles in the solid state have the least amount of kinetic energy.
As water freezes, it does so because after thermal energy leaves the particles, the average translational+rotational kinetic energy decreases, but the total average kinetic energy does not... and the temperature does not change either.
Which best explains how photosynthesis is helpful to humans? It reduces the amount of harmful rays released by the sun. It increases the levels of carbon dioxide in the air. It provides oxygen for humans to breathe. It produces proteins, which humans can eat.
Answer:
it provides oxygen for the human to breathe
Explanation:
During photosynthesis plants absorbs carbon dioxide from the atmosphere and release oxygen into the air. Hence, it increases the level of oxygen for breath.
What is photosynthesis?Photosynthesis is a biological process by which green plants produce energy and molecular oxygen in leaf by the aid of light energy. The photoactive pigments chlorophyll in green leaves absorbs light energy sufficient for this process.
The photosynthetic reaction involves combination of carbon dioxide and water to form glucose and oxygen as written below:
[tex]\rm 6H_{2}O + 6CO_{2} \rightarrow C_{6}H_{12}O_{6} + 6O_{2}[/tex].
Therefore, photosynthesis decrease the level of carbon dioxide and increase the level of oxygen in the air . Thus, plant biomass helps us to provide oxygen to breath.
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A scientist studies living organisms in their natural setting
Answer:
did not
Explanation:
ask
An ice cream company decides to make a new lower calorie flavor,but testers reported that the flavor wasnt as good as the original.Is this an example of trade off
Answer:
Yes, the given instance is an example of a trade-off.
Explanation:
The trade-off seems to be a strategy to minimize or surrender one or more favorable results in consideration for increasing either receiving other favorable results to optimize cumulative benefit or efficacy within such conditions.The above is indeed a trade-off since the participants are experimenting in exchange again for ice cream individuals have to enjoy. The ice cream manufacturer always gets a review of the technician in exchange for free ice cream.Members of group # ___ do not form ions or react with other elements.
Answer:
VIIA group donot form ions or react with other elements. This group is also called noble gases or inert gases which donot take part in chemical reaction.
6.
Which best represents a particle containing 28 protons, 26 electrons, and 34 neutrons?
A Fe2-
B
54
2+
28N;
C%2Fe2-
DSNi2+
Answer:
Ni^2+
Explanation:
The following data were obtained from the question:
Proton = 28
Electron = 26
Neutron = 34
Next, we shall determine the atomic number of the element.
Atomic number of an element is simply defined as the number of protons in the atom of an element.
Thus,
Atomic number = proton number
Proton = 28
Atomic number = proton number = 28
Atomic number = 28
Therefore, the element is Nickel since no two elements have the same atomic number.
Finally, we shall determine the charge on the Nickel atom as follow:
Proton = 28
Electron = 26
Charge on atom =
Charge on atom = Proton – Electron
Charge on atom = 28 – 26
Charge on atom = +2
Therefore, we can represent the Particle as Ni^2+