Holden is trying to determine the velocity of his race car. He went 20 meters east, turned around, and went 40 meters west. His car was 20 meters from the starting line. This took 5 seconds.
What is the car’s average velocity?
4 m/s east
4 m/s west
12 m/s west
12 m/s east
The average velocity can be found by calculating the total displacement of the car and dividing it by the total time.
The car's average velocity is "4 m/s west".
First, we will find the total displacement as follows:
Total Displacement = 20 m (East) + 40 m (West)
Taking East direction as positive and west direction as negative, we get:
Total Diplacement = 20 m - 40 m
Total Displacement = - 20 m = 20 m (West)
Now, the average velocity of the car will be:
[tex]Average\ Velocity = \frac{Total\ Displacement}{Total\ Time}\\\\Average\ Velocity = \frac{20\ m\ (West)}{5\ s}\\\\[/tex]
Average Velocity = 4 m/s west
The attached picture shows the description of average velocity.
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Answer: b
Explanation: just put B :)
In one paragraph, using your own words, explain how Earth's atmosphere is able to protect you against the harmful radiation that is emitted from the sun. Be sure to use proper spelling, grammar, and punctuation.
Answer: Higher up, in the stratosphere, the ozone layer absorbs solar ultra-violet radiation and affects how much of the Sun's heat is radiated back into space. The ozone layer shields us from the harmful effects of excessive UV radiation, which can lead to sunburn, skin cancer and eye damage.
Explanation: hope this helped :]
In the diagram above, the arrows labeled 'A' and 'B' point to the two different types of Earth's crust. What are the names of the two types of Earth's crust?
A- the oceanic crust and the continental crust
B- the mantle crust and the core crust
C- the convecting crust and the solid crust
D- the lithosphere and the athenosphere
Answer:
D the lithospers and the athenosphere
Explanation:
They are the first crusts
If an object is moving and the forces acting on it are unbalanced in the direction of motion, the object will...
only 2 hours left pls helppp
HELP ASAP 70 POINTS BRAINLIST What type of symbiotic relationship is reflected between the Druid Wolfpack and the Elk in the Yellowstone River valley?
Answer: they are both animals and they live near the yellow stone volcano so basically if the volcano erupts they'll be the first to die.
Explanation:
science, who ever answers this will get a brainlest
Answer:
divergent boundary
Explanation:
Answer:
Divergent boundaries is the process in which 2 plates are moving apart frm each other.
How much force is needed to accelerate a 5 kg mass at 3 m/s/s?
Explain the impact of objects in space on each other including: (1) the sun on the earth's and (2) the moon on the earth.
Answer: Its from 2. since are taking impact by the meteors.
Explanation:
I will mark brainlist pls help and. Give right answers
I think its b. Answer:
Explanation:
Tires with too much air can explode when overheated. Why? *
The particles in the tire clump together.
The particles in the tire spread out.
The particles of air inside the tire clump together.
The particles of air inside the tire spread out.
Answer:
D. The particles of air inside the tire spread out
Explanation:
HELP ME PLEASE!!!!!! A table showing variety among some young people.
Answer:
sorry please put a example of what you wanted help on.hold did u want to know eye color hair color. then please add a example of the the type of chart.What is the simplest way to build a graph of kinetic and potential energy?
Answer:
analize the levels of kinetic and potential energy and look up a guide to graph it and follow that
Explanation:
You serve a volleyball with a mass of 2.1 kg. The ball leaves your hand at 30 m/s. What is the kinetic energy (KE) of the volleyball?
awnser :
Explanation:
Answer:
I believe the answer is KE = 945 J
Explanation:
What is the critical mass of a species?
A) the number of individuals that must exist for a species to continue
B) the weight of all representatives of a species
C) the weight of the last representative of a species
Answer:answer is a
Explanation:
(Fill in the blanks)For every force there is one that is_____in size but _________in direction.
Answer: For every force there is a reaction force that is equal in size, but opposite in direction.
Hope it helps:)
For every force, there are 2 components one that is equal in size but opposite in direction.
What is force?Force is defined as a cause which is capable of changing the motion of an object. It can cause an object which has mass to change it's velocity. It is also simply a push or a pull . It has both magnitude as well as direction.Hence, it is a vector quantity.
It has SI units of Newton and is represented by'F'.Newton's second law states that force which acts on an object is equal to momentum which changes with time. If mass of object is constant, acceleration is directly proportional to net force acting on an object.
The concepts which related to force are thrust and torque .Thrust increases the velocity of an object and torque produces change in rotational speed of an object.
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What is an advantage of wind energy over solar energy? *
Wind is renewable, solar isn't.
Wind doesn't make carbon dioxide emissions.
Wind is available in more places than solar.
Wind is reliable, solar isn't.
Answer:
C
Explanation:
You can experience wind almost anywhere on earth, however, there are many shady locations where solar is inefficient.
I need help with science plz and ty( plz dont give me helpless answer)
Why does the velocity of the ball change when it hits the tree?
Answer:
If a ball is thrown vertically upward from the roof of a 32 ft. tall building with a velocity of 80 ft/sec, it's height in feet after t seconds is s(t)=32+80t-16t^2
Explanation:EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
Many plants like soy bean and corn have been selectively bred. Do you think this is acceptable and whyyyyy or why notttt?
HELP ME ASAP PLEASE!!!!!!
A chemist begins experimenting with silver and records the following properties:
Silver is a white metal that is an excellent conductor of heat and electricity. Silver tarnishes when exposed to air and light. The density of silver is 10.49 g/cm 3. The melting point is 962 degrees C and the boiling point is 2000 degrees C. Which of the following is NOT a physical property?
density of silver is 10.49 g/cm 3
melting point is 962 degrees C
Silver tarnishes when exposed to air and light
boiling point is 2000 degrees C
Answer:
3. Silver tarnishes when exposed to air and light
Explanation:
Physical properties are properties that change substances in ways that is visible to a human by using their senses (ie. see, touch, etc)
The rest of the answers are chemical properties, which cannot be seen with the human senses, and requires other special devices or techniques to tell.
-Vibilities
What is an advantage nuclear power has over solar or wind? *
Nuclear power is cheap.
Nuclear power is reliable.
Nuclear power is clean.
Nuclear power can be built anywhere.
Answer:
it more reliable
Explanation: Nuclear power is 2.5 to 3.5 more reliable than wind and solar
Yall have helped a lot i just need help on this then ill be done for a while
Write a discussion post that contains the following:
Information about the magnetic field from the three websites you used.
What each author believes about the magnetic field.
What you believe about the magnetic field.
Citations for your three websites.
Answer:
f(x)=a(x - h)2 + k
Much like a linear function, k works like b in the slope-intercept formula. Like where add or subtract b would determine where the line crosses, in the linear, k determines the vertex of the parabola. If you're going to go up 2, then you need to add 2.
The h determines the movement horizontally. what you put in h determines if it moves left or right. To adjust this, you need to find the number to make the parentheses equal 0 when x equals -2 (because moving the vertex point to the left means subtraction/negatives):
x - h = 0
-2 - h = 0
-h = 2
h = -2
So the function ends up looking like:
f(x)=a(x - (-2))2 + 2
Subtracting a negative cancels the signs out to make a positive:
f(x)=a(x + 2)2 + 2Explanation:
i know that when wind blows aginst a sail and propels the boat but if you had a whole bunch of leaf blowers blowing at the sail would it move?
Answer:
Yes
Explanation:
Since the sail boat uses wind to move, and since you have a whole bunch of leaf blowers which are producing wind, then yes it will move.
as the average kinetic energy of a substance increases, the tempature of the sample
A- decrease
B- increases
C- remains the same
Describe characteristics and identify oxidation-reduction(redox) reactions.
plz and thx
Answer:
I hope This helps
Explanation:
The majority of oxidation-reduction (redox) reactions share two critical features. One is that a reduction happens in both, while equivalent oxidation occurs; they are combined.
The oxidation - reduction (redox) reactions has the characteristics of changes in oxygen, hydrogen and electrons.
What are the characteristics and identify oxidation - reduction (redox) reactions?Oxidation is the process during the reaction the reactant loses the electron. Reduction is the process during the reaction, the reactant gains the electron.
Redox reaction can be identified by knowing the number of oxidation. It can also be known through the atoms in this process should be bonded as ionic. During the reaction, the increase in oxidation number can be said as oxidation.
The different types of redox reactions are:
Decomposition reactionDisproportion reactionCombination reactionDisplacement reactionThese are the important characteristics of oxidation and reduction (redox) reactions.
Learn more about redox reactions,
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science, who ever answers this will get a brainlest
!!!Ketchup vs mustard!!!
Answer:
Ketchup would be the one I choose.
Explanation:
ketchup!!!!!!!!!!!!!!
if you traveled 45,000 meters at a velocity of 4.5 m/s how many hours would it take
Show an explanation
Answer:
i dnt knw to be hhonest
Explanation:
Answer:
This better be right You travel 4 miles down a road you get there in 2 hours what is the speed.
Explanation:
Look at the diagram below.
Ray 1 from the Sun moves through air and falls on the surface of a lake. Ray 2 is a ray which travels from the surface of the lake at the point Ray 1 strikes the lake, and moves towards air. Ray 1 and Ray 2 make the same angle with the surface of the lake. Ray 1 bends towards the vertical when it enters the lake as Ray 3
(Ik this isn't physic's but its the closest i could find)
Which statement is correct about Ray 1?
A part of it is reflected as Ray 2.
A part of it is reflected as Ray 3.
Some of it is absorbed as Ray 2.
Some of it is absorbed as Ray 3.
Answer:
Some of it is absorbed as Ray 2.
Explanation:
hope this helps!
Compare metamorphic rock and intrusive igneous rock in terms of how and where they form. Then compare sedimentary rock and extrusive igneous rock in terms of how and where they form.
-I need help I only have 13 points and I'll try to give a good amount.
(there is not one that just says science so i chose random subject)
Answer: Igneous rock , formed by the cooling of magma (molten rock) inside the Earth or on the surface. Sedimentary rocks, formed from the products of weathering by cementation or precipitation on the Earth's surface. Metamorphic rocks, formed by temperature and pressure changes inside the Earth.
Explanation: