I throw a stone off a cliff 32 feet above the water. The height of the stone in terms of time (in seconds) is given by h(t) = -16t2 + 128t + 32. At what time will the stone splash into the water? Round your answer to nearest tenth of a second
Answers
From your equation, we can tell that you're defining the upward direction as
positive. We can also tell that you threw the stone upward, with an initial speed
as it left your hand of 128 feet per second, about 87 miles per hour ... a mighty toss indeed, and I think there's a man from the Chicago Cubs waiting outside
who'd like to talk to you.
Anyway, When the stone splashes into the water, h(t) = 0 .
-16t² + 128t + 32 = 0
Divide each side by -16 :
t² - 8t - 2 = 0
I don't see any easy way to factor the expression on the left,
so I have to use the quadratic formula to solve this equation.
t = 4 plus and minus √18 .
t = +8.24 seconds
t = -0.24 second
Mathematically, both numbers are valid solutions.But when you apply
the equation to a real world situation, only the positive 't' makes sense.
So t = 8.24 seconds.
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Which of the following statements is true about Planck's Law?. . A. The frequency of the emitted light is inversely proportional to the energy given off by the electrons.. . B.The frequency of the emitted light is directly proportional to the energy given off by the electrons.. . C. The wavelength of the emitted light is directly proportional to the energy given off by the electrons.. .D. The wavelength of the emitted light is inversely proportional to the energy given off by the electrons.
The acceleration due to gravity on Jupiter is greater than that on Earth. On Jupiter, a person will weigh .
The free-fall acceleration at the surface of planet 1 is 15 m/s2. The radius and the mass of planet 2 are twice those of planet 1. Part A What is g on planet 2
It follows one prescribed sequence of steps.
B.
It begins and ends with an experiment.
C.
It is used only in Earth and space science.
D.
It can be cyclic.
I need an answer now please....
Answers
Answer:
D. It can be Cyclic
Explanation:
Science has all different kinds of alike processes.
The scientific method is a generally and usually a Cyclical Process.
Answers
Answer:
500 m
Explanation:
The size of a nucleus is about
Instead, the size of the electron cloud extends at the order of
This means that the ratio between the size of the electron cloud and the size of the nucleus is about
So, the electron cloud is about 10,000 bigger than the nucleus of the atom.
Here we want to build a scale-model atom, in which the nucleus is the size of a tennis ball, so a size of approximately
Therefore, since the proportions must be respected, the electron clouds must be 10,000 bigger, so its size in this model would be:
So, the size of the electron cloud would be 500 m.
Final answer:
The cloud of electrons in a scale-model atom would extend about 100 meters.
Explanation:
The nucleus is a central, positively charged region within an atom. It contains protons, which have a positive electric charge, and neutrons, which are electrically neutral. Nuclei make up the majority of an atom's mass and are held together by the strong nuclear force, while electrons orbit the nucleus in electron shells.
In a scale-model atom where the nucleus is the size of a tennis ball, the cloud of electrons would extend about 100 meters. This can be calculated by comparing the size of the nucleus to the actual size of an atom. The diameter of a tennis ball is approximately 6.7 cm, while the diameter of an atom is on the order of 0.1 nm. By scaling up, we find that the electron cloud would extend around 100 meters.
Learn more about Scale-model atom here:
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B) It is conduction because the egg is touching the pan.
C) It is convection because you put oil in a frying pan to cook in it.
D) It is convection because you can feel the heat a few inches away from the pan.
Answers
Answer: Option (B) is the correct answer.
Explanation:
A process in which transfer of heat occurring when one object touches another object is known as conduction.
For example, when a pan is heated and then an egg is placed over the pan. Then there will be transfer of heat from pan towards the egg.
As a result, the egg gets cooked because the egg was touching the pan.
Hence, we can conclude that it is conduction because the egg is touching the pan.
Heat transfer is used to fry an egg in a pan, It is conduction because the egg is touching the pan. Hence the correct option is option (B).
When frying an egg in a pan, the primary mode of heat transfer is conduction. Conduction is the transfer of heat through direct contact between two objects or substances.
The pan is heated on a stovetop or a heat source, which causes the pan to become hot. When the egg is placed in the pan, the heat from the pan is transferred to the egg through the process of conduction.
Option A suggests that it is conduction because the egg gets cooked, but this answer does not explain the specific mechanism of heat transfer involved.
Option C mentions convection because oil is used in frying. While oil can enhance the cooking process, convection is not the primary mode of heat transfer in this scenario.
Option D states it is convection because you can feel the heat a few inches away from the pan.
Therefore, option B is the correct answer, as it correctly identifies that the heat transfer involved in frying an egg in a pan is conduction because the egg is touching the pan.
To know more about heat transfer:
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Answers
Answer:
m
Explanation:
meaning that the way different people from around the world come together to play and converse brings about a universal language.we might not know their language but still through sports that we don't even need to know just play
what their origin, background, religious beliefs, or economic status. Sports can play a role in improving the lives of whole communities.
B.) atomic number from mass number
C.) atomic number from electron number
D.) isotope number from atomic number
Answers
To find the number of neutrons in an atom, what we must do is to follow the following steps:
1) Find the element in the periodic table.
2) Find the atomic number of the element. The atomic number is the number of protons of a single atom of that element.
3) Find the atomic weight of the element.
4) Finally, we look for the number of neutrons. For this, we follow the following relationship:
Atomic weight - number of protons = number of neutrons.
Answer:
To find the number of neutrons in an atom, you would subtract:
B.) atomic number from mass number
Option B is the correct answer, because the number of neutron is equal to the difference between the mass number and atomic number.
Further explain:
Before going about the calculation of the number of neutron in an atom, firstly we will know something about an atom.
An atom is a fundamental unit of matter. It is composed of nucleus and electrons orbiting around the nucleus.
The electrons in an atom are orbiting around the nucleus in the shells of different energies.
Maximum part of the mass of an atom is concentrated in its nucleus and it is composed of proton and neutron. They are also known as nucleons of an atom.
Proton and electron are the charge particles. Proton carries the positive charge while electron carries the negative charge of same amount, but neutron does not carry any type of charge so it is neutral.
The total number of electron is equal to the total number of proton is an atom.
That’s why atoms are neutral in nature.
Atomic number: The total number of electron or total number of proton in an atom is known as the atomic number.
Here, is the atomic number and
is the number of proton.
Atomic mass: The sum of number of proton and neutron in an atom is known as atomic mass or mass number.
So, atomic mass can be calculated as,
Here, is the atomic mass or mass number and
is the number of neutron .
So, number of neutron can be calculated as,
So, number of neutron is equal to the difference between the mass number and number of proton or atomic number.
Learn more:
1. Water is a compound: brainly.com/question/4636675.
2. Acceleration of the box against the friction: brainly.com/question/7031524.
3. Example of energy brainly.com/question/1062501.
Answer detail:
Grade: High school
Subject: Chemistry
Chapter: Atom
Keyword:
Number of neutron, mass number, proton, electron, atomic number, atom, nucleus, difference, atomic mass, subtraction, orbit, neutral.
water
salt
uranium
Answers
Nuclear power plants require large volumes of water to cool reactors and convert heat to electricity. Water is a good conductor of thermal energy and is conducive for cooling reactors because it can easily absorb energy without application of anything.
Answer:
Water
Explanation: