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?
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awnser :
Explanation:
Answer:
I believe the answer is KE = 945 J
Explanation:
Related Questions
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.
Answers
Because the answer is A
Answer:
Some of it is absorbed as Ray 2.
Explanation:
hope this helps!
Describe characteristics and identify oxidation-reduction(redox) reactions.
plz and thx
Answers
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.
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A block of wood 3.0 cm on each side has a mass of 27 g. What is the density of this block?
(please explain I will mark brainliest)
Answers
Density= mass/volume
So we know that the:
Mass= 27g
Volume= 3x3x3= 27cm^3
So you would do:
27/27= 1
So the answer is:
1g/cm^3
Hope this helps :)
How much force is needed to accelerate a 5 kg mass at 3 m/s/s?
Answers
Explanation:
Force = mass x acceleration
F=m • a
Mass= 3 m/s
Acceleration=5kg
5 x 3 = 15
Force=15N
Plants give off oxygen as part of photosynthesis. Explain the impact of this process on humans.
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Answer:
Humans breathe in the oxygen that the plants produce, in return we breathe out carbon dioxide which is what plants breathe in so in total, we both are helping each other.
The process of photosynthesis is helpful for humans because it involves production of oxygen, essential for human lives.
The given problem is based on the process of photosynthesis and the effect of photosynthesis on humans.
The photosynthesis is the process by which the green plants and other organisms utilize the sunlight to prepare nutrients from carbon dioxide and water.Photosynthesis in plants involve the green pigment known as Chlorophyll, which is responsible for the production of oxygen into the atmosphere.And humans breathe in the oxygen that the plants produce, in return we breathe out carbon dioxide which is what plants breathe in so in total, we both are helping each other.Thus, we can conclude that the process of photosynthesis is helpful for humans because it involves production of oxygen, essential for human lives.
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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.
Answers
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:
as the average kinetic energy of a substance increases, the tempature of the sample
A- decrease
B- increases
C- remains the same
Answers
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.
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Answer:
D. The particles of air inside the tire spread out
Explanation:
What is the simplest way to build a graph of kinetic and potential energy?
Answers
Answer:
analize the levels of kinetic and potential energy and look up a guide to graph it and follow that
Explanation:
Which of the following is not a result of deforestation?
A) Deforestation lowers the amount of trees available to remove carbon dioxide from the environment.
B) Deforestation lowers carbon dioxide by creating more land for water to be absorbed.
C) Deforestation raises carbon dioxide by burning wood.
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Answer:
B
Explanation:
if you traveled 45,000 meters at a velocity of 4.5 m/s how many hours would it take
Show an explanation
Answers
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:
I need help with science plz and ty( plz dont give me helpless answer)
Answers
2. A
I’m not sure on 3
2.) A
3.) C
i hope this helps!
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
Answers
The object will slow down
Explanation: if you are walking towards harsh wind, you will slow down because of the pressure pushing you.
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
Answers
Answer:answer is a
Explanation:
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
Answers
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 :)
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)
Answers
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:
Many plants like soy bean and corn have been selectively bred. Do you think this is acceptable and whyyyyy or why notttt?
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science, who ever answers this will get a brainlest
Answers
Answer:
divergent boundary
Explanation:
Answer:
Divergent boundaries is the process in which 2 plates are moving apart frm each other.
HELP ME PLEASE!!!!!! A table showing variety among some young people.
Answers
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.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?
Answers
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.
Explanation:
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.
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Answer: Its from 2. since are taking impact by the meteors.
Explanation:
(2) The moon impacts the Earth with gravity. It keeps the two in orbit and also causes things like the tides.
Plz help i'll award brailest to best answer
Answers
Answer:
1. Vibrations - the cause of sound
2. Prism - triangular, transparent solid that separates the colors of light.
3. Refract - bend
4. Rainbow - light refracted into the spectrum by raindrops.
5. Pigment - a coloring matter.
6. Pitch - the frequency of sound
7. Crest - the top of a light wave
8. Speed of light - 186,000 MPS.
9. Visible light spectrum - band of color that make up sunlight.
10. White - reflects all colors of light
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
Answers
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.
Answers
nuclear power is not cheap or clean, it also cannot be built anywhere i don’t think if not b then i suppose try D next
Answer:
it more reliable
Explanation: Nuclear power is 2.5 to 3.5 more reliable than wind and solar
what does an unconformity in a sequence of rock layers reveal about geologic history?
a. An organism went extinct during that time
b. a layer of rock might have eroded causing a gap in the record
c. the layers of rock cover hundreds of square miles
d. the new rock layers have been deposited very quickly
Answers
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.
Answers
Answer:
C
Explanation:
You can experience wind almost anywhere on earth, however, there are many shady locations where solar is inefficient.
This is because there are many places that don’t get enough sunlight to power solar but there is enough wind to power wind
(Fill in the blanks)For every force there is one that is_____in size but _________in direction.
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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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Why does the velocity of the ball change when it hits the tree?
Answers
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
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
Answers
Answer:
D the lithospers and the athenosphere
Explanation:
They are the first crusts
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.
Answers
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 :]