An object is moving along a straight line. The graph shows the velocity of the object over
time.
What is the instantaneous acceleration of the object at time = 9.5 seconds?
A.-20 m/s2
B.0 m/s2
C.20 m/s2
D.-10 m/s2
Answer:
From 9 to 10 sec the velocity is decreasing at a constant rate.
Change in V = 20 m/s - 30 m/s = -10 m/s
Since acceleration is constant from point E to point F (straight line)
and t = 9.5 sec is on this line
a = (20 m/s - 30 m/s) / 1 sec = -10 m/s^2
The instantaneous acceleration of the object at time = 9.5 seconds is - 10 m/s².
What is acceleration?Acceleration is the rate at which speed and direction of velocity vary over time. A point or object going straight ahead is accelerated when it accelerates or decelerates. Even if the speed is constant, motion on a circle accelerates because the direction is always shifting.
From t = 9 second to t =10 second the velocity of the object decreases at a constant rate.
Change in velocity of the object = final velocity - initial velocity
= 20 m/s - 30 m/s
= -10 m/s
time interval is = 10 sec - 9 sec = 1 sec.
Hence, acceleration of the object is: a = Change in velocity/ time interval
= - 10 m/s/1s
= -10 m/s²
Therefore, the instantaneous acceleration of the object at time = 9.5 seconds is - 10 m/s².
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How long would it take you too run the 100m sprint if from rest you accelerate at 2m/s/s for the whole race?
Answer:
10 s
Explanation:
Given:
Δx = 100 m
v₀ = 0 m/s
a = 2 m/s²
Find: t
Δx = v₀ t + ½ at²
100 m = (0 m/s) t + ½ (2 m/s²) t²
t = 10 s
What does this indicate about the claim?
claim
[klām]
VERB
state or assert that something is the case, typically without providing evidence or proof.
"he claimed that he came from a wealthy, educated family" · [more]
synonyms:
assert · declare · profess · maintain · state · hold · affirm · avow · aver · [more]
NOUN
an assertion of the truth of something, typically one that is disputed or in doubt.
"he was dogged by the claim that he had CIA links" · [more]
synonyms:
assertion · declaration · profession · affirmation · avowal · averment · protestation · representation · contention · submission · case · allegation · pretense · asseveration
a demand or request for something considered one's due.
"the court had denied their claims to asylum"
Answer:
the first person is right at all
1. Reflection Question: What are some actions or activities that can affect your heart rate and respiratory rate and cause either or both of them to increase or decrease?
Answer:
There are following two activities which affect heart rate and respiratory rate.
1-Exercise
2-Hiking
Explanation:
when we are exercising or hiking our heart rate and respiratory rate affected. This is because during hiking and exercising our body may need three or four time your normal cardiac output. This is because our body consuming energy during the workout and our muscles needs more oxygen. To meet the need of energy and oxygen respiration rate become fast and heart rate also increase.
What is one example of thermal energy
Answer:
Solar Energy
Explanation:
Solar radiation (a form of an object) heats up our atmosphere, that's why heat is felt on earth.
8
An airplane flies 8000 m in 30 seconds. Calculate the velocity of the airplane. U
(10 Points)
O 0.27 m/s
16 m/s
267 m/s
24,000 m/s
Answer:
267
Explanation:
8000/30= 266.666666667
or 267 rounded to the nearest whole
While riding her bike, Maria averaged a velocity of 20 m/s. If she maintains that a velocity for a time of 20 seconds, how far does she ride?
Answer:
400m
Explanation:
distance = speed x time
20 x 20
=400m
A certain atom has eight protons, eight electrons, and eight neutrons. How many nucleons does this atom have? What is the atomic number of this atom? What is the mass number of this atom?
Explanation:
Number of nucleons
= no of protons + no of neutrons
= 8 + 8
= 16
Atomic number = no of protons = 8
Atomic mass = 15.999
Match the element with its description.
Column A
1. Sodium :
2. Silicon :
3. Bromine :
4. Argon:
Column B
a. Nonreactive gas
b. Has properties of both metals and nonmetals
c. Malleable, soft, and shiny
d. Highly reactive gas
What are the matches?
Answer:
1.c
2.b
3.d
4.a
Explanation:
There are your answers
Answer:
Sodium---Malleable, soft, and shiny
Silicon---Has properties of both metals and nonmetals
Bromine---Highly reactive gas
Argon---Nonreactive gas
Can you tell me what a substance is
Answer:
Explanation:
a particular kind of matter with uniform properties.
Answer:
a particular kind of matter with uniform properties or the real physical matter of which a person or thing consists and which has a tangible, solid presence.
Explanation:
The elements least likely to form bonds are found in which group?
O 15
O 16
017
O 18
The element that is least likely to form bonds is found in group 18. Thus, the correct option for this question is D.
What is group 18 of the periodic table known?The elements of group 18 in the modern periodic table are known as noble gases. These gases are colorless, odorless, tasteless, and nonflammable under standard conditions.
They were once labeled group 0 in the periodic table because it was believed they had a valence of zero, meaning their atoms cannot combine with those of other elements to form compounds.
Due to this fact, they would not have any ability to form bonds with other elements in order to produce compounds or molecules. They are the most stable elements because they have a full outer shell of valence electrons, so they have no need to bond with other elements.
Therefore, the element that is least likely to form bonds is found in group 18. Thus, the correct option for this question is D.
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What makes human travel to the other planets in our solar system difficult?
Answer:
Taking water and oxygen from Earth is rather expensive and hard to do.
Explanation:
Without water and oxygen, travel to other planets is basically impossible
The smallest units of life that make up all living things are Group of answer choices tissues organ system organs cells
Answer:
Cells is your answer
Explanation:
Cells are the basic unit of life
hope this helped you
please mark as the brainliest (ㆁωㆁ)
In need of help!!!!!!
Answer:
b
Explanation:
because it fly and you need for it to drop at the right spot for them to get it
An object of mass 30 kg is falling in air and experiences a force due to air resistance of 50 newtons. Determine the net force acting on the object:
Explanation:
Draw a free body diagram. There are two forces: weight force pulling down and air resistance pushing up.
Sum the forces in the y direction:
∑F = 50 N − (30 kg) (10 m/s²)
∑F = -250 N
Why did Archimedes shout eureka what did he find out?
Answer:
I believe he shouted eureka after he stepped into a bath and noticed that the water rose. He then realized that the volume of water displaced must be equal to the volume of the part of his body he had submerged
Explanation:
The property of matter that describes what it is made of
Answer:
Miixture
Explanation:
The answer is mixture
how does mass affect gravity????
Help me pleaseee!!!!!
Picture too blurry. Please add a clearer image of it.
hey can anyone help me out pls!
If you try to squish a table it aint gonna move. That is because,
C. They are packed closely together.
A isn’t true.
B is true, they do vibrate, but that is NOT the reason why it doesn’t change when pressure is applied.
D is wrong because C is correct.
describe how changing the particles changed the atom
Answer: During chemical changes particles do change with atoms or ions regrouping . Bonds (links) between atoms break and new ones form and energy is either given out or taken in.
Explanation:
Chemical reactions make particles to change and resulting to change atoms or ions via regrouping .
What is chemical reaction?The chemical reaction is the reaction between two reactants that led to the formation of products.
The products are substances that forms after reaction. The reactants are the substances which are original materials.
Bonds between atoms break and make new ones. In this process, energy is either rejected or taken in.
The particle are the electrons which are shared between the atoms of same or different elements.
The electrons in the valence get donated or accepted by the atoms and form bond. When the electrons are donated, the bonds break and when electrons are accepted, bonds are formed. So, the new element or compound is formed.
Thus, the chemical reaction are responsible for change in atoms due to change in particles.
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If a questions says "at what point does the ball stop?" what is it asking for?
Explanation:
If a question says "at what point does the ball stop?", it means we need to find the position of the ball when its final velocity is equal to 0. It can be calculated using the equation of kinematics as follows :
d = ut + (1/2) at²
and
v²-u²=2ad
Where, u is initial velocity, v is final velocity, a is acceleration, t is time and d is displacement.
Why does stone take so long to cool?
Answer:
Stone has what's called a high thermal conductivity, which is simply a fancypants way of saying that it allows heat to flow through it quickly. For example, suppose the piece of stone in question is at room temperature, or 70 degrees. Your body likes to keep an average toasty temperature of 98.6F.
a. How can a spinning ball have more lift than one that is not spinning?
Answer:
It is spinning, making the ball a little more airborn than the one that isn't spinning
Answer:
A spinning ball creates a Centrifugal Force because it is given the "energy" so to speak to spin. A ball that is not moving does not need any external energy to keep it still or, in other terms, at rest.
Explanation:
List one benefit and one limitation of using scientific models.
Answer:
the benefit is that they can see and experiment on the model but some times the model isn't accurate resulting in immediate failure
im only 13 sorry if this is wrong i tried.
Use the reaction equation to answer the question
6CO2 + 6H20 - C6H12O6 + 602
The reaction equation shows a common chemical reaction. Where does this reaction commonly occur?
A
in soap mixed with oil
B
in candle wax as it burns
С
in the leaves of a plant
D
in animals digestive systems
Answer:
C
Explanation:
in the leaves of a plant where photosynthesis occurs
is the value of resistance the same for all materials?
Answer:
No it's different for different objects because they made of different materials
What is a hypothesis?
A.
a statement that can be tested through a scientific investigation
B.
a description of the steps involved in an experiment
C.
a statement that summarizes the results of an experiment
D.
a question that cannot be scientifically tested
Answer:
A
Explanation:
a statement that can be tested through the scientific method
For writing a scientific lab report, when you write the discussion do you need to include every single result in your data? Or do you just include a summary of your data?
Answer:
include a summary of data
Explanation:
In writing a scientific laboratory report, only the summary of the data is included in the discussion and not the entire result.
The discussion section of a lab report deals with the interpretation and explanation of findings during the course of the experiment in relation to the background information leading to the experiment/research. Hence, only the summary of the data generated is required. The detailed results are usually reported in the result section, not the discussion section.
The friction of the water on a boat produces an acceleration of -10 m/s2. If the
boat is traveling at 30 m/s and the motor is shut off, how long does it take the boat
to slow down to 5.0 m/s?
a
2.5 s
b 2.35
c
2.2 s
d
2.0 s
Answer:2.5s
Explanation:
Idk I guessed and got it right
Friction is the force that exists between two surfaces that are sliding or attempting to slide across each other.
The acceleration produced by the friction of water is a = [tex]-10 m/s^2[/tex]
The boat takes 2.5 seconds to slow down.
What causes of friction?Surface roughness: When two rough surfaces collide, they generate frictional force or an opposing force, which can sometimes be converted into heat. Body deformation: Deformations in the body or the surface of the body in contact may cause friction during motion.Friction is the force that exists between two surfaces that are sliding or attempting to slide across each other. For example, friction makes it difficult to push a book across the floor. Friction always acts in the opposite direction that the object is moving or attempting to move.The equation that rules the change of velocities is:
[tex]V = V _0 + at[/tex]
Where:
a = acceleration
Vo = initial speed
v = final speed
t = time
The acceleration produced by the friction of water is a = [tex]-10 m/s^2[/tex] and the boat is initially traveling at v=30 m/s. When the motor is shut off, the boat will start braking until it stops. We need to find the time it takes to ready the final speed of v=5 m/s.
t = [tex]\frac{V - V_0 }{a}[/tex] = -5-30 /10 = 2.5 s.
The boat takes 2.5 seconds to slow down.
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