1. Tyrone is riding his newly bought motorcycle at 30 m/s when he sees a cat on the road ahead. He applied immediately the brakes and comes to a stop in 3.0 s. What was the acceleration of his motorcycle?
Given:
Asked:
Solution:
Final Answer:
2. A jeepney speeds up from 50 km/h to 60 km/h to overtake a truck. If this requieres 20 s, what is the (a) acceleration and (b) distance traveled by the car?
Given:
Asked:
Solution:
Final Answer:
Pls help
Answer:
1. a = -10 m/s²
2. a = 1.8 × 10³ km/h²; s = 0.31 km
Explanation:
1.
Given:
Initial speed (u): 30 m/s
Final speed (v): 0 m/s (rest)
Time elapsed (t): 3.0 s
Asked:
Acceleration (a)
Solution:
We will use the following expression.
a = (v-u)/t = (0 m/s - 30 m/s)/3.0 s = -10 m/s²
Final Answer:
a = -10 m/s²
2.
Given:
Initial speed (u): 50 km/h
Final speed (v): 60 km/h
Time elapsed (t): 20 s
Asked:
(a) Acceleration (a)
(b) Distance traveled (s)
Solution:
(a) First, we will convert the time to hours.
20 s × 1 h/3600 s = 0.0056 h
Then, we will use the following expression.
a = (v-u)/t = (60 km/h - 50 km/h)/0.0056 h = 1.8 × 10³ km/h²
(b) We will use the following expression.
s = u × t + 1/2 × a × t²
s = 50 km/h × 0.0056 h + 1/2 × 1.8 × 10³ km/h² × (0.0056 h)² = 0.31 km
Final Answer:
a = 1.8 × 10³ km/h²
s = 0.31 km
How many Group 17 elements are in Period 3 of the Periodic Table? A) 1 B) 2 C) 3 D) 4
A magnesium ion, Mg2+, is formed from a magnesium atom, Mg.
Which row about the numbers of protons and neutrons in the magnesium ion and in the magnesium atom is correct?
Why the answer for this question is B.
Pls help to explain it. Thank you.
Answer:
The correct row is B.
Explanation:
The formation of the magnesium ion, Mg²⁺, comes from the removal of 2 electrons from the valence shell of the magnesium atom. Since the remotion is of electrons, the nucleus of the atom remains the same, so the number of protons and the number of neutrons does not change.
If the number of proton change, then the atom also change, since the identity of an atom is related to the atomic number which is the same to the proton number.
Now, if the number of neutrons changes, then we would be in the presence of an isotope of the magnesium atom.
Therefore, the correct row is B.
I hope it helps you!
Which method involves separating a solution by liquids moving across a selectively permeable membrane?
Distillation
Chromatography
Fractionation
Osmosis
Answer:
OSMOSIS
Explanation:
Osmosis (/ɒzˈmoʊ.sɪs/) is the spontaneous net movement or diffusion of solvent molecules through a selectively permeable membrane from a region of high water potential (region of lower solute concentration) to a region of low water potential (region of higher solute concentration),
How would the balloons interaction with each other change if the balloons were moved further apart? Explain.
Explanation:
It is known that like charges repel each other and unlike charges attract each other.
As the balloons are facing each other with like charges so they will repel each other. Hence, they will move apart.
But when balloons were moved further apart then interaction between them will decrease and then there will be no force of repulsion or force of attraction.
Where are both earthquakes and volcanoes common?
a) in the earth’s interior
b) at transform fault boundaries
c) at focal points
d) at subduction zones
6. Which of the following represent kinetic energy? *
(1 Point)
the water behind a dam
O a boulder hug from a net over a pit
a calculator falling to the floor
the string on a bow before being released
Answer:
weter
Explanation:
This woman comes to the clinic with high blood pressure,
hyperglycemia(high blood sugar), weakening of the bones and severe
depression of the immune system. Can you diagnose her condition?
How many grams of NaOH are needed to make 250mL of a 0.1M NaOH solution?
Answer:
To make 250 ml of 0.1 M NaOH, you dissolve 1 gram NaOH in enough water to make a final volume of 250 mls.
Explanation:
Your welcome! :)
What do you notice about the distance between the terrestrial planets compared with the spacing between the gas giants
Answer:
The spacing between the terrestrial planets is less than that between the gas planets.
Explanation:
Since the terrestrial planets which are Mercury, Venus, Earth and Mars have a distance of 0.4 AU, 0.7 A.U, 1.0 AU and 1.5 A.U respectively from while the gas planets which are Jupiter, Saturn, Uranus and Neptune have a distance of 5.2 AU, 9.6 AU, 19.6 AU and 30 AU respectively from the sun, we can see that the spacing between the terrestrial planets is much smaller than the spacing between the gas planets.
For example, the spacing between Mercury and Venus is 0.7 AU - 0.4 AU = 0.3 AU while that between Earth and Venus is 1.0 AU - 0.7 AU = 0.3 AU.
Also, the spacing between Earth and Mars is 1.5 AU - 1.0 AU = 0.5 AU.
Also too, the spacing between the gas planets is shown below the spacing between Jupiter and Saturn is 9.6 AU - 5.2 AU = 4.4 AU while that between Uranus and Saturn is 19.6 AU - 9.6 AU = 10.0 AU.
Also, the spacing between Neptune and Uranus is 30 AU - 19.6 AU = 10.4 AU.
Thus, we can see that the spacing between the terrestrial planets is less than that between the gas planets.
Note that AU means astronomical unit and 1 AU is the distance between the Earth and the Sun. 1 AU = 1.50 × 10⁸ km
The following statements characterize a chemical reaction, EXCEPT a.The atoms of the substance rearrange, but the total number of atoms remain the same after the reaction. b.a change in odor c.a change in the total mass of the product d.Energy is involved in the reaction that is either absorbed or released.
Answer:
C. a change in the total mass of the product
Explanation:
A chemical reaction is a reaction that alters the chemical composition of the substances involved. Based on the options in this question, a chemical reaction possess the following features:
- The atoms of the substance called reactants are rearranged into products but the total number of atoms remain the same after the reaction.
- A change in odor occurs as one of the indicators that a chemical reaction has taken place.
- Energy is either absorbed (endothermic) or released (exothermic) in the chemical reaction.
However, one untrue option is that "there is a change in the total mass of the product". The total mass of a chemical reaction does not change i.e. remains the same, before or after the reaction in accordance to the law of conservation of mass.
Enzymes are proteins that speed up chemical reactions in the body.
How do they work?
A) They provide a path with lower activation energy.
B) They increase the concentration of reactants.
C) They decrease the concentration of products.
D) They increase the surface area of reactants.
Answer:
D. They Increase the surface area of reactants.
Explanation:
And why I say the answer is D, Because Enzymes are soluble protein molecules that can speed up chemical reactions in cells
When Enzymes are proteins that speed up chemical reactions in the body so here it increase the surface area of reactants. hence, option d is correct.
What are enzymes?It is the substance that is treated as the catalyst in the living organism.
In this, the biological process arises within the living organism are considered to be the chemical reactions.
Also, enzymes should be soluble protein molecules that speed up the chemical reaction in cell.
hence, the option d is correct.
learn more about an enzyme here: https://brainly.com/question/19346597
what's the chemical formula for salt, like is it NaCl??
the salt we eat???????
yeah it's NaCl, I just looked it up
Answer:
Yes
Explanation:
NaCl is table salt
Also known as sodium chloride
Help needed asap, I will mark the brainiest tomorrow after homework is graded (PLEASE NOT FUNNY BUSINESS)
Answer:
Oh my gosh
dis one pass me
what form of energy does a glue gun produce when turned on?
What is the state of HNO3 in the reaction? HNO3 (g) --> NO2 (g) + 2 H2O (1) 1 point
+ O2 (g)
gas
liquid
aqueous
Answer:
gas
Explanation:
the answer is right in the question (g) stands for gas.
HURRRY PLS!!
Glycolysis is a ten-step process that breaks down glucose into
A)
NAD+.
B)
two molecules of pyruvate.
C)
ATP.
D)
FAD.
Answer:
B. Two molecules of pyruvate.
Explanation:
Trust me. I got it RIGHT!
An oil may be converted into a substance that is solid at room temperature by Group of answer choices adding hydrogens, decreasing the number of double bonds in the molecules. cooling it, so that double bonds form and the fats solidify. removing water, causing a dehydration synthesis reaction to occur. removing hydrogens, increasing the number of double bonds in the molecules.
Answer:
Adding hydrogens, decreasing the number of double bonds in the molecules.
Explanation:
Hydrogen is a catalyst, which means that it accelerates or speeds up the velocity of a chemical reaction, by adding hydrogens to oil it will decrease the number of double bonds in the molecules which will make it solidify over time.
Oil + hydrogen creates substances that are solid at room temperature.
Cuantos moles de CO2 se requieren para reaccionar con 2 moles de Ba (OH)2
Answer:
hola soy jess, tu respuesta esta aqui
¿cuantos moles de CO2 se requiere para reaccionar 2 moles de Ba(OH)2
2 mol Ba(OH)₂ × \frac{1molCO_{2} }{1molBa (OH)_{2}}
1molBa(OH)
2
1molCO
2
= 2 moles CO₂
Explanation:
espero que pueda ayudarte
hermana/hermano
lo que
hahahaha
CO(g) + 3 H2(g) → CH4(k) + H2O(g) + heat
The sign of AH is
The sign of AS is
The sign of AG is negative a low or high temperature?
Explanation:
AH is negative because the reaction gives out heat (exothermic).
AS is negative because the total entropy of the reactants is greater than that of the products (there are 4 moles of gas on reactant side compared to only 1 mole on the product side). Thus, the reactants are said to be "messier" than the products.
AG is negative at lower temperatures because at low temperatures, -TAS is more negative, resulting in the negative sign of AG.
Hope this helps.
Name any three organic fertilizer using by farmers ?
Answer:
Typical organic fertilizers include mineral sources, all animal waste including meat processing, manure, slurry, and guano, plant based fertilizers, such as compost, and biosolids.
True or False? Once a sugar molecule is dissolved, it remains as long as the conditions (temperature,
amount of water, stirring, etc.) remain constant.
Answer:
The above statement is False
How does anatomy provide evidence for evolution?
I'll give brainlist!! Simple answer please.
Please somone help me with a chemistry question brainliest to whoever answers correctly and 20 points
Answer:
289.15k is the answer buddy
Which of the following is the best definition of nuclear fission?
O A. Nuclear fission is the joining of two or more nuclei into one
nucleus.
B. Nuclear fission is the formation of new isotopes through a gain of
electrons.
C. Nuclear fission is the splitting of a nucleus into two or more
nuclei.
O D. Nuclear fission is an exothermic reaction between two stable
nuclei.
Answer:
C
Explanation:
Nuclear fission is a process where the nucleus of an atom is split into two or more smaller nuclei, known as fission products.
Nuclear fission is the splitting of a nucleus into two or more nuclei defines best of nuclear fission among the following , therefore option (c) is correct.
What do you mean by the nuclear fission ?Nuclear fission is a process in which an unstable nucleus splits into two nuclides and emits neutrons.
The fission process often produces free neutrons and photons and releases a large amount of energy. Therefore , nuclear fission is either a nuclear reaction or a radioactive decay process.
The fission process often produces gamma radiations , and releases a very large amount of energy .
Nuclear fission is the splitting of a nucleus into two or more nuclei defines best of nuclear fission among the following , hence option (c) is correct.
Learn more about nuclear fission , here:
https://brainly.com/question/14899304
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Which of the following most likely happens when the number of particles of a gas decreases?
The pressure of the gas increases.
The pressure of the gas remains same.
The number of collisions of gas particles decreases.
The number of collisions of gas particles remains same.
Answer: C. The number of collisions of gas particles decreases
Explanation: As temperature decreases so does everything else same with increase.
When the number of particles of a gas decreases the pressure of the gas increases.
Factors affecting has pressureIn a container containing has molecules, they move about freely in the container but the pressure it exerts on its container depends increase of decrease of the has molecules by volume.
If the volume of a container is decreased, the gas molecules have less space in which to move around. As a result, they will strike the walls of the container more often and the pressure increases.
Therefore, when the number of particles of a gas decreases the pressure of the gas increases.
Learn more about gases here:
https://brainly.com/question/25736513
Directions: Each set of lettered choices below refers to the numbered statements immediately following it. Select the one lettered choice that best fits each statement. A choice may be used once, more than once, or not at all in each set. The following questions refer to the below molecules: (A) CO2 (B) H2O (C) CH4 (D) C2H4 (E) PH3 The molecule that has trigonal pyramidal geometry
Answer:
The given molecules are:
(A) CO2 (B) H2O (C) CH4 (D) C2H4 (E) PH3
Which one has trigonal pyramidal geometry?
Explanation:
According to VSEPR (valence shell electron pair repulsion) theory, a molecule with a central atom having hybridization sp3 and with one lone pair of electrons has trigonal pyramidal geometry.
Among the given molecules,
CO2 has central atom carbon with sp hybridization without lone pairs.
So, it is a linear molecule.
H2O, the central atom is oxygen with sp3 hybridization and oxygen has two lone pairs. So, its geometry is V-shape or bent.
CH4 has central atom carbon with sp3 hybridization and no pairs.
So, its geometry is tetrahedral.
C2H4 ethene has carbon atoms as the central atoms with sp2 hybridization and carbon has no lone pairs.
So, its geometry is trigonal planar.
Answer:
PH3 has central atom P with sp3 hybridization.
P has one lone pair on it.
Hence, the geometry of PH3 is trigonal pyramidal.
Is lotion pure or impure?
Answer:
Pure
Explanation:
Lotion is pure. Hope this helps!
Answer:
I think pure
hope this helps
have a good day :)
Explanation:
Why does hydrogen naturally form diatomic molecules (H2), whereas helium exists as a single atom (He)?
Answer:
Hydrogen is a very reactive element. It doesn't exist as a single atom in nature. Neither do any of the other binary nonmetals -- nitrogen, oxygen, fluorine, chlorine, bromine, and iodine. They're too prone to react with something. They react with each other and form binary molecules because the binary molecules are more stable than single atoms (by a lot!). Compounds with other atoms are even more stable, so hydrogen reacts with oxygen to form water, and chlorine reacts with sodium to form table salt.
Explanation:
Given the translation (0,5), translate ordered pairs (9, 0) and (2,-4).
Answer:
(9,5) and (2,1)
Explanation: