Initial velocity=u=3m/s
Final velocity=v=10m/s
Time=t=8s
[tex]\boxed{\sf Acceleration=\dfrac{v-u}{t}}[/tex]
[tex]\\ \sf\longmapsto Acceleration=\dfrac{10-3}{8}[/tex]
[tex]\\ \sf\longmapsto Acceleration=\dfrac{7}{8}[/tex]
[tex]\\ \sf\longmapsto Acceleration=0.8m/s^2[/tex]
Distance =sUsing second equation of motion
[tex]\\ \sf\longmapsto s=ut+\dfrac{1}{2}at^2[/tex]
[tex]\\ \sf\longmapsto s=3(8)+\dfrac{1}{2}(0.8)(8)^2[/tex]
[tex]\\ \sf\longmapsto s=24+0.4(64)[/tex]
[tex]\\ \sf\longmapsto s=24+25.6[/tex]
[tex]\\ \sf\longmapsto s=49.6m[/tex]
12
The motion of an object can be described by it
A.
speed.
В.
position.
C.
direction.
D.
all of these
Answer:
D
Explanation:
The motion of an object can be described by its speed, position, and direction so its all of the above
can a physical quantity have unit but is dimensionless?
Answer:
i might be wrong here, but i`m pretty sure dimensionless things are infinite, and infinity can not be defined by a single quantity.
for example, since space is constantly expanding, it never has and never will have an actual measurement of any sort.
Which of the following best represents R=A+B ?
A)
B)
C)
Answer:
C
Explanation:
Options A and B are not even pointing in the direction as the vectors in the question so they shouldn't even be considered.
Option C looks like the closes since vectors A and B are pointing in a similar direction (negative x-axis)
The best representation for the resultant vector representing the resultant R=A+B would be option C because the result is represented by the closing side of the triangle, therefore the correct answer would be C.
What is a vector quantity?The quantities that contain the magnitude of the quantities along with the direction are known as the vector quantities.
Examples of vector quantities are displacement, velocity acceleration, force, etc.
As given in the problem we have to find out the resultant vector from the sum of vector A and vector B,
The resultant of the vector can be calculated with the help of the triangle law of the vector addition in which the sum is given by the closing side of the triangle.
Thus, the correct answer is option C.
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why is burning a paper a chemical change
when we burn a paper it undergoes the combustion reaction.
You are making a round trip from City A to City B and back to City A again at constant speed. At what point in the trip is your average speed equal to four times the magnitude of your average velocity?
We have that the Magnitude of Velocity is equal to Speed when You are half way back to A from B.
[tex]4V=S[/tex]
From the Question we are told that
Trip from city A to B and back
Generally
Velocity This is defined as the distance cover over time ratio with respect to direction
While
Speed
This is the distance cover over time ratio with no regard to direction.
With the above definitions in mind
Magnitude of Velocity with respect to direction of back forth has a net of zero and
While Magnitude Speed of increases as it returns to A after going to B
in conclusion
The Magnitude of Velocity is equal to Speed when You are half way back to A from B.
4V=S
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Every mass exerts a gravitational force on every other mass.
a. True
b. False
Answer:
A
Explanation:
newton's law of universal gravitation states that every point mass in the universe attracts every other point mass with a force that is directly proportional to the product of their masses
A car traveling at 90 m/s can stop in a distance of 110 m. What is the magnitude of the cars acceleration as it slows down?
I think I have already answer this question. Anyways please do let me know whether it is useful or not
A cheetah can maintain its maximum speed of 100 km/hr for 30.0 seconds. What minimum distance must a gazelle running 80.0 km/hr be ahead of the cheetah to escape?
Explanation:
Suppose the cheetah is initially positioned at x=0 (m) from the reference, and the gazelle is intially at poisiton x=d (m).
Then, at the worst case, that is when cheetah is running at the maximum case, the position of the gazelle relative to the reference must be larger than that of cheetah.
In equation form,
[tex]0\text{ km}+\frac{100\text{ km}}{1 \text{ hr}}\cdot30\text{ s }\cdot\frac{1\text{ hr}}{3600\text{ s}}\le d \text{ km}+\frac{80\text{ km}}{1 \text{ hr}}\cdot30\text{ s }\cdot\frac{1\text{ hr}}{3600\text{ s}}[/tex]
[tex](100-80)\cdot \frac{30}{3600}\le d[/tex]
[tex]d\ge \frac16\text{ km}=166.66 \text{m}[/tex]
The minimum distance that a gazelle running 80.0 km/hr be ahead of the cheetah to escape is 6.5807km
If a cheetah can maintain its maximum speed of 100 km/hr for 30.0 seconds, the distance covered by the cheetah is expressed as:
Distance = Speed * time
Given the following:
Speed = 100km/hrTime = 30secs = 0.00833333hrDistance covered = 100 * 0.00833333
Distance covered = 0.0833 km
If gazelle is running at a speed of 80.0km/hr, the distance of gazelle will be expressed as:
Distance of gazelle = 80 * 0.08333Distance covered by gazelle = 6.6664kmTaking the difference in distance = 6.6664km - 0.0833 km =6.5807km
Hence the minimum distance that a gazelle running 80.0 km/hr be ahead of the cheetah to escape is 6.5807km
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Why did mathematicians and scientists begin formulating game theory for use in economics? (1 point)
The gaming approach had been successfully applied in other fields.
They expected people to continue playing games for millennia.
O Mathematics alone could not account for human behavior.
O Science and mathematics were no longer applicable.
it is the short method of calculating economics
Nuclear sizes are expressed in a unit named
A) Fermi
B) Angstrom
C) Newton
D) Tesla
Answer:
Answer is A) Fermi
Explanation:
Fermi is the expressive unit for nuclear sizes. Fermi = 10^-15 meter.
Convert the following in to SI units without changing its values
a. 4000 g
b. 2.4 km
Plz help. I will make you a brailyest and 10,000 $
Answer:
4000g
Thank You
Hope it helps
Answer:
a 4 kg
b 2400 meter
Explanation:
International system of units Sl
the units are
kelvin for temperatures
meter for distance
Ampere for electric current
Second for time
Kg for mass
...etc
which type of lever is steep road
Answer:
Third class lever
Explanation:
Third class lever
what do you mean by mass of object is 7 kg
Explanation:
Mass=7 kg means that it weights 7 kg while measuring on beam balance .
Which do solar flares and coronal mass ejections have in common?
You have three flowers. You give
each a different amount of
water. What is one of the
possible controlled variables?
Answer:
flowers
Explanation:
flowers cannot change
A force acting on a moving ball causes its motion to change. This force stays constant.
What makes the force produce a greater change in the motion of the ball.
Answer:
you stop the ball or bring it to a different direction
Explanation:
i don't know if this helps. i didn't take physics yet. but i hope this helps.
If the force remains constant, then the decrease in the mass of the ball will increase the acceleration of the ball.
What is force?Force acting on a body can be defined as the changes in the state of the body of motion or rest. Force can change the speed and the direction of the moving body. The force acting on an object is related to factors which are mass and acceleration of the body.
The mathematical expression from the 2nd law of motion for force can be written as:
F = ma
We can express this equation as:
a ∝ 1/m
Therefore, the acceleration of a moving body is inversely proportional to the mass of that body.
Therefore, if we are applying the constant force on the ball, then this force can produce a greater change in the motion of the ball only if the mass of the ball will be less. Then the acceleration of the moving ball will increase.
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if a firebird travels at a velocity of 0 to 60 mph in 4 seconds traveling east what was the acceleration of the firebird
What characteristics do atoms of carbon-12, carbon-13, and carbon-14 have in common? 1. same number of electrons 2. same number of protons 3. same number of neutrons and electrons 4. same number of neutrons and protons 5. same number of protons and electrons 6. same mass 7. same number of neutrons
Answer:
The most common of these is carbon 12, 13, 14. All of these isotopes have the same atomic number but different mass numbers. Carbon has the atomic number of 6 which means that all isotopes have the same proton number. However, the number of neutrons is different, thus giving different mass numbers.
The distance from Atlanta to Macon is about 80 miles out of 58.5° south of east. What distance is dues east and dues south mustyou drive in order to travel from Atlanta to Macon?
Answer:
One must drive [tex]$41 \cdot 8\,miles$[/tex] north and [tex]$68 \cdot 24\,miles$[/tex] south, in order to travel from Atlanta to Macon.
Explanation:
• The distance of an object can be defined as the complete path travelled by an object.
• To find the distance, find its north component.
• For reference see the below graph:
[tex]$$\[\begin{align}& D_{south} = 80\sin \left( {58 \cdot {5^ \circ }} \right) \\& D_{north} = 80\cos \left( {58 \cdot {5^ \circ }} \right) \\\end{align}\]$$Since, $\sin \left( {58 \cdot {5^ \circ }} \right) = \cdot 853$ and $\cos \left( {58 \cdot {5^ \circ }} \right) = \cdot 5224$: therefore,$$\[\begin{align} D_{south} &= 80 \times \left( { \cdot {{853}^ \circ }} \right) \\ \Rightarrow {D_{south}} &= 68 \cdot 24\,miles \\ \end{align}\]$$[/tex]
And
[tex]$$\[\begin{align} D_{north}& = 80 \times \cdot 5224 \\ \Rightarrow D_{north}& = 41 \cdot 8\,miles \\ \end{align}\]$$[/tex]
• Hence, one must drive [tex]$41 \cdot 8\,miles$[/tex] north and [tex]$68 \cdot 24\,miles$[/tex] south, in order to travel from Atlanta to Macon.
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If the number of protons equal the number of
the atom will have no charge
protons
electrons
neutrons
nucleus
if an atom has an equal number of protons and electrons, its net charge is 0. If it gains an extra electron, it becomes negatively charged and is known as an anion. If it loses an electron, it becomes positively charged and is known as a cation.
hope this helps
Question should be corrected
If the number of protons equal the no of electrons the charge of atom is?Answer:-
See
protons have +ve chargeelectrons have -ve chargeIf both are equal then
Net charge is zeroHere the given's question answer must be electron or its wrong
Question # 3
In the following figure, XY is a see - saw of 4 metres length. It is pivoted at its midpoint Z.
calculate the anticlockwise moment, about a horizontal axis passing through Z, of a child of weight
230 Newton who sits:
X. Z. Y
a. At X
b. 0.5 m from X
X
c. At Y
d. At Z and explain why it is acting that way
Explanation:
The moment of A about B is given by the formula
[tex]M=Fd[/tex]
where M is the moment, F is the force acting perpandicular to the axis of rotation about B by A, and d is the horizontal distance of A from B along the axis of rotation.
Now
[tex]F=230 (N)[/tex]
(a) At X,
[tex]M=(230)(4/2)=460 (Nm)[/tex]
(b) At 0.5m from X,
[tex]M=(230)(2-0.5)=345 (Nm)[/tex]
(c) At Y,
[tex]M=-(230)(2)=-460 (Nm)[/tex]
where negative sign indicates clockwise rotation of the child about Z.
(d) At Z,
[tex]M=(230)(0)=0 (Nm)[/tex]
1.020 please help!!
Mark brainliest
Answer:
0.0035 mg
Explanation:
1 mcg = 1e-3 mg
》35 mcg = 35×10^-3 mg
= 0.0035 mg
please help me, i need to show my work but im dont know how
Which object is not accelerating?
A A baseball player sliding into home base.
B A blue Ford 150 pick-up truck speeding up from 50 mph to 80 mph.
C A ladybug crawling forward at constant rate of 2.5 m/s.
D A student riding on a Ferris wheel at a constant rate of 5.0 m/s.
C. The ladybug's speed and direction are not changing, so she has no acceleration.
In A, B, and D, either speed or direction are changing, and that's acceleration.
what is third law of motion
[tex] \huge \fbox \colorbox{teal}{ANSWER:-}[/tex]
Newton's Third Law of Motion states: 'To every action there is an equal and opposite reaction'. ... The Third Law of Motion indicates that when one object exerts a force on another object, the second object instantaneously exerts a force back on the first object.
Which of the following must an engineer take into account when designing a roller coaster?
the mass of the roller coaster
the rates at which the roller coaster will change directions
the total mass of the people that will ride the roller coaster
the acceleration of the roller coaster due to gravity
Answer:
Explanation:
All of the above.
Certainly a coaster could be designed without considering any one item of mass, gravity, or rates of direction change, but the success of the ride would be highly suspect.
Ignoring mass (of cars and/or riders) could lead to support members not being strong enough.
Ignoring rates of change of direction could lead to support members not being strong enough or make the forces on the riders uncomfortable.
Ignoring gravity could lead to support members not being strong enough or make the forces on the riders uncomfortable.
Convert 4 centimeters to meters using dimensional analysis and scientific notation. Please go step by step as I am having difficulty with this subject.
Question:-
Convert 4cm to m
Solution:-
Lets do
First note down the below formula
[tex]\boxed{\sf 1m=10^{2}cm}[/tex]
Then
[tex]\boxed{\sf 1cm=10^{-2}cm}[/tex]
Now we are given 4cm
So convert
[tex]\\ \sf\longmapsto 4\times 10^{-2}m[/tex]
If we simplify to decimal
[tex]\\ \sf\longmapsto 4cm=0.04m[/tex]
Hence done .
What is difference between simple microscope and compound microscope
Answer:
simple microscope - a codenser lens is not required I simple microscopes .
compound microscope- the condenser lens is embedded in compound microscopes for adjusting the intensity of the light to magnify the object.
Explanation:
hope this helps you
mrk me brainiliest
The two ends of a coiled wire are connected to the electrodes of a lightbulb.
How does the bar magnet induce a current in the wire?
NS
A. Moving the bar magnet back and forth along the axis of the coil
induces a current in the wire.
B. Placing the bar magnet parallel to the axis and inside the coil
induces a current in the wire.
C. Placing the bar magnet at 90° to the axis of the coil induces a
current in the wire.
O
D. Moving the bar magnet in a circle around the lightbulb induces a
current in the wire.
Answer:
a
Explanation:
The bar magnet moves downward with respect to the wire loop, so that the number of magnetic field lines going through the loop decreases with time. This causes an emf to be induced in the loop, creating an electric current.
in other words, the magnets motion creates a current in the loop
Answer:
A?
Explanation:
A car accelerates from rest to 100 m/s in 20 s. What is its acceleration?
[tex]\\ \sf\longmapsto Acceleration=\dfrac{v-u}{t}[/tex]
[tex]\\ \sf\longmapsto Acceleration=\dfrac{100-0}{20}[/tex]
[tex]\\ \sf\longmapsto Acceleration=\dfrac{100}{20}[/tex]
[tex]\\ \sf\longmapsto Acceleration=5m/s^2[/tex]
Answer:
[tex]initial \: velocity \: = 0 \\ final \: velocity \: 100 \frac{m}{s} \\ time = 20 \\ here \: we \: want \: to \: find \: accelaration \\ accelaration \: = \frac{final \: velocity - initial \: velocity}{time} \\ accelaration \: = \frac{100 - 0}{20} = \frac{100}{20} = 5 \frac{m}{ {s}^{2} } \\ thank \: you[/tex]
