• The only force acting on the ball, and thus the net force, is due to its own weight, with magnitude
w = m g = (0.4 kg) (9.8 m/s²) ≈ 3.9 N
pointing downward.
• The ball is in free fall, so its acceleration is g = 9.8 m/s² (also pointing downward).
• The ball is dropped from a height of 49 m, so its height y at time t is
y = 49 m - 1/2 g t ²
Set y = 0 and solve for t :
0 = 49 m - 1/2 g t ²
t ² = (98 m) / g
t = √((98 m) / g) = √(10) s ≈ 3.2 s
• The ball's velocity v at time t is
v = - g t
so that at the time found previously, the ball will have attained a velocity of
v = - g (3.2 s) ≈ -31 m/s
and thus a speed of about 31 m/s.
A car changes its velocity from 40.0 m/s to -5.0 m/s in 5.0 seconds what was the car average acceleration
Answ40x-50 =2334
Explanation:
idk
In a chemical reaction, molecules of hydrogen gas (H2) react with molecules of oxygen gas (O2) in a sealed reaction chamber to produce water (H2O). This occurs through the following chemical equation. 2H2 + O2 → 2H2O What is conserved as the reaction occurs in the reaction chamber? A. temperature B. mass C. flammability D. molecule size
Answer:
Option (B) is correct.
Explanation:
Given that the molecules of hydrogen gas ([tex]H_2[/tex]) react with molecules of oxygen gas ([tex]O_2[/tex]) in a sealed reaction chamber to produce water ([tex]H_2O[/tex]).
The governing equation for the reaction is
[tex]2H_2 +O_2 \rightarrow 2H_2O[/tex]
From the given, the only fact that can be observed that 2 moles of [tex]H_2[/tex] and 1 mole of [tex]O_2[/tex] reacts to produce 2 moles of [tex]H_2O[/tex].
As the mass of 1 mole of [tex]H_2 = 2[/tex] grams ... (i)
The mass of 1 mole of [tex]O_2 = 32[/tex] grams ...(ii)
The mass of 1 mole of [tex]H_2O = 18[/tex] grams (iii)
Now, the mass of the reactant = Mass of 2 moles of [tex]H_2[/tex] + mass 1 mole of [tex]O_2[/tex]
[tex]= 2 \times 2 + 32[/tex] [ using equations (i) and (ii)]
[tex]=4+32 = 36[/tex] grams.
Mass of the product = Mass of 2 moles of [tex]H_2O[/tex]
[tex]=2\times 18[/tex] [ using equations (iii)]
=36 grams
As the mass of reactants = mass of the product.
So, mass is conserved.
Hence, option (B) is correct.
what is the definition for scientific model?
Answer:
Explanation:
Scientific modelling is a scientific activity, the aim of which is to make a particular part or feature of the world easier to understand, define, quantify, visualize, or simulate by referencing it to existing and usually commonly accepted knowledge.
If a dog ran at 5 m/s how far would it run in 45 s
Answer:
225 m//s
Explanation:
It ran 5m/s so 5x45=225
Answer:
225 meters
Explanation:
If it is running 5 meters per seconds, and it ran 45 seconds, you would need to multiple the seconds it ran by the speed per second: 5 • 45
5 • 45 = 225
What is the main function of a cell
Answer:
they provide structure and support, facilitate growth through mitosis, allow passive and active transport, produce energy, create metabolic reactions and aid in reproduction.
Explanation:
they provide six main functions.
1.
How do you assess these words : "Terrorists ", "pretty"; "gay"? Are
your assessment based on unfo unded generalizations or facts?
Answer:
Terrorists:scary,ruthless,morbid. Pretty:beautiful,sweet. Gay:happy,sweet,nice
Explanation:
Reeee
An Ewok accelerates (at a light jog) at 5 m/s/s with only 20 newtons of force. What is the mass of our furry friend?
Answer:
4 kgExplanation:
The mass of the object can be found by using the formula
[tex]m = \frac{f}{a} \\ [/tex]
f is the force
a is the acceleration
From the question we have
[tex]m = \frac{20}{5} \\ [/tex]
We have the final answer as
4 kgHope this helps you
Answer:
XD
Explanation:
XD furry friend
Furry's muck eachother
KBr: periodic table def
Answer: Is that a question?
Explanation:
Which of Newton’s laws explains why your hands get red when you press them hard against a wall.
Answer:
Newton's third law, if i'm not mistaken.
Explanation:
Any action that occurs will have a opposite and equal action. The greater the force u apply to the wall, the greater the force the wall exerts back at you, hence why ur hands become red if u try pushing extremely hard on the wall.
The mechanical energy of a coconut falling from a tree______
A. doesn't exist
B. increases
C. decreases
D. remains constant
Answer:
D. is the answer
Explanation:
Answer:
D
Explanation:
Which refers to the rate of change in velocity?
speed
acceleration
direction
magnitude
Answer:
acceleration
Explanation:
it is the time rate change in velocity
Answer:
acceleration
Explanation:
Julie's teacher finally asks the class to think about the force that pulls the Space Shuttle
back to Earth after a mission in orbit. The class identifies the force as gravity but then a
discussion begins as to the cause of the gravity force. Members of the class give the
following options.
Answer:
What are the opinions?
Explanation:
We need to see a question and opinion
Planets A and B have the same size, mass, and direction of travel, but planet A is traveling through space at half the speed of planet B. Which statement correctly explains the weight you would experience on each planet? A. You would weigh less on planet B because it is traveling twice as fast as planet A. B. You would weigh the same on both planets because their masses and the distance to their centers of gravity are the same. O C. You would weigh more on planet B because it is traveling twice as fast as planet A. D. You would weigh the same on both planets because your mass would adjust depending on the planet's speed.
Answer:
B. You would weigh the same on both planets because their masses and the distance to their centers of gravity are the same.
Explanation:
Given that Planets A and B have the same size, mass.
Let the masses of the planets A and B are [tex]m_A[/tex] and [tex]m_B[/tex] respectively.
As masses are equal, so [tex]m_A=m_B\cdots(i)[/tex].
Similarly, let the radii of the planets A and B are [tex]r_A[/tex] and [tex]r_B[/tex] respectively.
As radii are equal, so [tex]r_A=r_B\cdots(ii)[/tex].
Let my mass is m.
As the weight of any object on the planet is equal to the gravitational force exerted by the planet on the object.
So, my weight on planet A, [tex]w_A= \frac {Gm_Am}{r_A^2}[/tex]
my weight of planet B, [tex]w_B=\frac {Gm_Bm}{r_B^2}[/tex]
By using equations (i) and (ii),
[tex]w_B=\frac {Gm_Am}{r_A^2}=w_A[/tex].
So, the weight on both planets is the same because their masses and the distance to their centers of gravity are the same.
Hence, option (B) is correct.
Need done ASAP! A golf ball with a mass of 200g leaves the ground with an initial velocity of 50m/s what is the maximum gravitational store of the ball when it reaches its highest point ?
Answer:
10 m
Explanation:
200 g convert to kg = 0.2 kg
v = 50 m/s
F= ma
= 0.2(50)
= 10
What is the work done if you push a tree with
50 N of force but the tree does not move?
Answer:
The work done is 0.
Explanation:
The reason no work is done is because the equation W = Fs.
W = work
F= force
s= displacement
In this scenario F = 50 and s= 0
Therefore.
W = 50(0)
W = 0
help please....................
Answer:
a. arranging from least to higher pressure exerted by object B ,D A, C
b object B exert maximum pressure on surface because pressure is indirectly proportional to the surface area from the above figure we can easily conclude that object a have least surface area so, it exert more pressure on surface.
c.object C exert minimum pressure on surface because pressure is indirectly proportional to the surface area from the above figure we can easily conclude that object a have large surface area so, it exert less pressure on surface.
Explanation:
Why are Physical changes Not represented by Equations
Physical changes are not represented by equations because it does not involve rearrangement of atoms.
WHAT IS A PHYSICAL CHANGE:A physical change is a change that does not involve formation of new substances. Since no new substances are formed, this means that the atoms of the substance is not broken or rearranged. Unlike chemical changes, physical changes involves a change in state of matter.Therefore, physical changes are not represented by equations because it does not involve rearrangement of atoms.
Learn more about physical change at: https://brainly.com/question/864557
Drawing a ray diagram for an object far from convex lens requires how many rays?
Question 12 options:
one
two
three
four
Answer
4
Explanation:
four rays can also explain the ray diagram if the object is at infinity
A baseball is hit with 114 newtons has a mass of 0.145kg. What is the acceleration of the baseball?
Answer:
786.2m/s²
Explanation:
Given parameters:
Force = 114N
Mass = 0.145kg
Unknown:
Acceleration of the baseball = ?
Solution:
According to newton's second law of motion, the product of mass and acceleration is the net force on the body;
Force = mass x acceleration
Insert the parameters and find the acceleration;
114 = 0.145 x acceleration
Acceleration = [tex]\frac{114}{0.145}[/tex] = 786.2m/s²
explain the difference between the three types of friction
Answer:
Static Friction
It is the friction that exists between a stationary object and the surface on which it's resting.
Sliding friction
It is the resistance created by two objects sliding against each other.
Rolling friction:-
It is the force resisting the motion when a body rolls on a surface.
17. If a good is a luxury, what type of response will it cause?
If the focal length of a concave mirror is 18cm, find its radius of curvature.
Given :
The focal length of a concave mirror is 18 cm.
To Find :
The radius of curvature of the concave mirror.
Solution :
We know,
[tex]\text{Focal length}=\dfrac{\text{Radius of curvature}}{2}\\\\F=\dfrac{R}{2}\\\\R = 18\times 2\ cm\\\\R = 36 \ cm[/tex]
Therefore, the radius of curvature of concave mirror is 36 cm.
Hence, this is the required solution.
What must happen to the electric current in power lines before it can safely enter your home?
It passes through a step-up transformer.
It passes through a turbine.
It passes through a generator.
It passes through a step-down transformer.
Answer: use the step down transformers to reduce these voltages in the power lines before they are supplied to the users.
Explanation:
Answer:
It passes through a step-down transformer.
Explanation:
Electric current in power lines must be stepped down before they enter our homes because they carry a very high voltage.
The voltage can destroy appliances that have very low voltage.
In this regard, a step down transformer is used to achieve this effect. The transformer brings the voltage to a level fit to consumers to use. When voltage is stepped down, appliances can work perfectly.which is the smallest particle of an element ?
Answer:
Atoms
Explanation:
An atom is the smallest particle of an element that still has the properties of that element
Answer:
[tex] \huge{ \boxed{ \bold{ \sf{Atom}}}}[/tex]
✎ Let's explore about Atoms :
⟶ The smallest particle of an element which takes part in a chemical reaction without its division is called an atom. All the atoms of an element are the same. The atoms of different elements are different. All the atoms of iron in an iron nail are the same. But the atoms of iron are different from the atoms of copper. All the atoms of elements except hydrogen are made up of electron , proton and neutron. A hydrogen atom is made up of only electron and proton. Most of the atoms of elements do not exit independently except the atoms of inert gases like helium , neon , krypton etc.
____________
✑ EXTRA INFO :
STRUCTURE OF THE ATOM :
⟶ According to scientists , an atom is a sphere with a diameter of approximately [tex] \sf{ {10}^{ - 10}} [/tex] m. In the [tex] \sf{ {19}^{th} }[/tex] century , it was found that there are other smaller particles in an atom. These smaller particles are called subatomic or elementary or fundamental particles. The main subatomic particles are electrons , protons and neutrons. Among three subatomic particles of an atom , protons and neutrons are located at the centre of the atom called nucleus. The nucleus shows the positive charge due to the positive charge of protons. It also helps to find atomic weights . Electrons are revolving around the nucleus in their respective orbits or shells. The number of electrons present in an atom determines the size of the atom as it occupies more space as compared to the nucleus. In any atom , the number of negatively charged electrons in the orbits is equal to the number of positively charged protons in the nucleus. So, An atom is electrically neutral.
Hope I helped!
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Atom A and Atom B have the same number of protons and neutrons, but they do not have the same number of electrons.
Which statement describes the atoms?
The atoms have the same chemical symbol.
The atoms have the same charge.
The atoms have different atomic numbers.
The atoms have different atomic masses.
Answer:
The answer is C- the atoms have different. A. Topic numbers
Explanation:
if they have the same neutrons and protons but not electrons the atomic numbers cant be the same if they dont have all 3 of the same numbers.
(on edge 2020-2021)
The atoms have different atomic numbers.
The atomic number of an atom is equal to the number of protons in its nucleus. Since Atom A and Atom B have the same number of protons and neutrons, they have the same atomic mass, which is the sum of protons and neutrons in the nucleus.
However, the number of electrons in an atom can vary. An atom is electrically neutral, which means it has the same number of protons and electrons. If Atom A and Atom B have different numbers of electrons, they will have different charges. One atom may have gained or lost electrons, making it either negatively charged (anion) or positively charged (cation), while the other remains neutral.
The chemical symbol of an element represents the identity of the element, and it is determined by the number of protons in the nucleus, which is the atomic number. Since the atoms have different atomic numbers, they will have different chemical symbols.
Therefore, the correct statement is that the atoms have different atomic numbers, as their atomic numbers determine their chemical identity.
To learn more about neutrons, here
https://brainly.com/question/31977312
#SPJ2
how long does it take a 5kW shower to use 25000J of energy?
Explanation:
p=5kw=5000w t=? p=w/t, t=w/p
w=25000j t=25000j/5000w
=5s
You are standing at the top of a high cliff. You drop a rock and it hits the ground 4 seconds later. How fast was it going when it hits the ground?
A. -9.8 m/s
B. -38.2 m/s
C. -29.4 m/s
D. -19.6 m/s
Answer:
B. -38.2 m/s
Explanation:
Given parameters:
Time of fall = 4s
Unknown:
Final velocity of the rock = ?
Solution:
To solve this problem, we use the expression below;
V = U + gt
V is the final velocity
U is the initial velocity
g is the acceleration due to gravity = 9.8m/s²
t is the time taken
Now, insert the parameters and solve;
V = 0 + (9.8 x 4) = 39.2m/s
Answer it and get 100 points.
Answer:
because metals a good conductor of electricity.
Explanation:
Metal particles are held together by strong metallic bonds, which is why they have high melting and boiling points. The free electrons in metals can move through the metal, allowing metals to conduct electricity.
Explanation:
Metals are good conductors of electricity and are ducitile i.e. can be drawn into thin wires hence they are used for making wires.
what's computer software, give the types of computer software with 5 examples each
Answer:
The system software is a collection of programs designed to operate, control, and extend the processing capabilities of the computer itself. System software serves, the interface between the hardware and the end users. Some examples of system software are Operating System, Compilers, Interpreter, Assemblers.
Explanation:
A computer software is a collection of computer programs that provides instructions for a computer on what to do and how to do it. There are two types of software:
1. System Software 2. Application software
1. System software controls the various operations performed by the computer hardware. It helps the user operate the computer system.
2. An application software is used to perform operations for a specific task.
Explain the difference between a government Law and a Law of Science
Answer:
U.S. Federal Government Law addresses government interactions on a national scale, and is largely composed of administrative law and constitutional law. ... State law also establishes and regulates local government for cities, towns, counties, and other communities.In general, a scientific law is the description of an observed phenomenon. It doesn't explain why the phenomenon exists or what causes it. The explanation of a phenomenon is called a scientific theory
Explanation:
