Answer:
10 meters per seconds or 10m/s
Explanation:
An object has a velocity of 9 m's and a mass of 20 kg. What is the kinetic energy of the object? A 90 J C. 810 J B 180 J D. 1,620 )
Answer:
K=1/2mv^2=(20x81)/2=810J
What is the magnitude and direction (right or left) of the
net force acting on the box?
______ N to the _______
Answer:
12 N to the Right
Explanation:
12 N is the answer for the first box and right is the answer for the second box
2. A hammer hits a nail with a force of 50 N into some wood. The area of the point of the nail is 0.02 cm2. What is the pressure the nail puts on the wood?
What is the pressure the nail puts on the wood?
Answer:
hmmdndbdjjdjdhdjejjejdjdhdudududjhdhdhdhd
I hope this helps.......
A roller skater of 47kg moving with a velocity of 12 m/s to the east picks up a bag of 6.0 kg. What is the final velocity of the person traveling with the basket? show your work HINT: Use the law of conservation of momentum in the perfectly inelastic collision m1v1i + m2v2i = (m1+m2) vf
plz guys i have exam now answer her quikly
Answer:
v_f = 10.85 m/s
Explanation:
We will apply the law of conservation of momentum here:
[tex]m_{1}v_{1i} + m_{2}v_{2i} = m_{1}v_{1f}+m_{2}v_{2f}\\[/tex]
where,
m₁ = mass of roller skater = 47 kg
m₂ = mass of bag = 6 kg
v_1i = initial speed of roller skater = 12 m/s
v_2i = initial speed of the bag = 0 m/s
v_1f = final speed of the roller skater = ?
v_2f = final speed of the bag = ?
Both the bag and the skater will have same speed at the end because kater is carrying the bag:
v_1f = v_2f = v_f
Therefore, the equation will become:
[tex](47\ kg)(12\ m/s)+(6\ kg)(0\ m/s)=(47\ kg)(v_{f})+(5\ kg)(v_{f})\\564\ N.s = (47\ kg+5\ kg)(v_{f})\\v_{f} = \frac{564\ N.s}{52\ kg}\\[/tex]
v_f = 10.85 m/s
6. A guitar has six strings of the same length. The thickness or mass of the strings is different and each string has a different pitch and frequency. Explain why the mass of the string affects the frequency of the wave. (Hint: Think about how force, mass, and acceleration are related.)
a bit confused on this last question...
You can download answer here
tinyurl.com/wtjfavyw
How is it that even light precipitation can still cause the collection of large amounts of water.
Answer:
the heat of the light.
Explanation:
no matter the light, there's always heat being produced from it. and heat makes liuqid rise
PLEASE HELP!!! GIVING BRAINLIEST!! ill also answer questions that you have posted if you answer these correctly!!!! (77pts)
Answer:
Ex.
1. When we try cycling when we push the padel cycle starts but if we do not push the padels the cycle will stop on one position........
name the instrument made on the basis of expansion of heat
Answer:
The instrument is thermometer
The smallest bird is the Cuban bee hummingbird, which has a mass of only 1.7 g. If this bird did 8.8 10 –4J of work by exerting an upward force of 3.4 10 –4 N, how far did it fly?
Answer:
The distance the bird flew is approximately 2.59 meters
Explanation:
We list out the parameters in the question, and the required measurement as follows;
The mass of the Cuban bee hummingbird, m = 1.7 g = 0.0017 kg
The amount of work the bird does, W = 8.8 × 10⁻⁴ J
The amount of upward force the bird exerts, F = 3.4 × 10⁻⁴ N
Let 'd' represent the distance flown by the bird
(The downward force, [tex]F_g[/tex] = The weight of the bird, W
W = The mass of the bird, m × The acceleration due to gravity, g
The acceleration due to gravity, g ≈ 9.81 × 10 m/s²
∴ [tex]F_g[/tex] ≈ 0.0017 kg × 9.81 m/s² = 0.016677 N > F)
Given that the weight of the bird is larger than 'F', we assume that the force exerted by the bird is the net force, [tex]F_{NET}[/tex] = F
Therefore;
Work done, W = Net Force, [tex]F_{NET}[/tex] × Distance, d
∴ W = [tex]F_{NET}[/tex] × d
d = W/[tex]F_{NET}[/tex] = 8.8 × 10⁻⁴ J/(3.4 × 10⁻⁴ N) = 2.58823529 meters
The distance the bird flew, d ≈ 2.59 m.
The speed of an object in motion will _____ if the net force acting on it is opposite the direction that the object is moving.
Answer:
Decrease
Explanation:
Electric charge can be built up on what material in the form of static electricity?
A. insulators
B. conductors
C. Semiconductors
D.Superconductors
what energy source would be the most cost efficient and have the smallest impact on the climate? evidence?
Answer: Solar energy and wind energy both can be used
Explanation: Solar energy as well as wind energy would be the most preferable energy source for this community.
Solar energy is the energy that is directly derived from the sun and can be transformed into electrical energy. For example, the use of solar panels.
Wind energy is obtained by the natural agent known as wind. In the region where the wind is high, the turbines moves very fast, thereby generating electricity. For example, wind mill.
Thus this two energy sources are less costly and have lesser environmental impacts and they are very precise and is currently rising in the faster rate and with innovative technical upgradation.
PLEASE HELP!!! GIVING BRAINLIEST!! ill also answer questions that you have posted if you answer this correctly!!!! (40pts)
Answer:
Distance
Explanation:
If i'm wrong then eXcUsE mE :')
Apart from physical factors, what other environmental factors are in your environment?
Answer:
Explanation:
Factors which affects and impacts our environment may include water, sunlight, buildings and so many other. The factors which can touched are called the physical factors. The physical factirs include buildings, humans and so on. Other factirs which aren't physical inckide the the effects posed to the environment t by biological and chemical factirs which may include, the impacts in sunlight and Rainfall, the pH and so on.
Answer quick!!! (Edge 2021)
Haley noticed a small spot on her skin that turned out to be skin cancer. Which treatment is her doctor most likely to use?
A) Brachytherapy
B) Superficial external beam radiation therapy
C) Radiopharmaceuticals
D) High Intensity Focused Ultrasounds
The treatment most likely to use is Superficial External bean Radiation Therapy. Then the correct option is B.
What is the electromagnetic spectrum?The electromagnetic spectrum consists of the range of all types of EM radiation. Radiation is a packet of energy that travels and spreads out.
It has radio waves, infrared waves, visible light waves, ultraviolet rays, and microwaves.
They possess high energy even to penetrate deep within the material. the electromagnetic spectrum has a longer wavelength and less frequency.
Haley noticed a small spot on her skin that turned out to be skin cancer.
Surgery, radiation, chemotherapy, and hormone therapy can all be used to relieve signs and symptoms.
Medications may relieve symptoms such as pain and shortness of breath. Palliative treatment can be used.
The treatment most likely to use is Superficial External bean Radiation Therapy.
Then the correct option is B.
Learn more about the electromagnetic spectrum.
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A bus as speed of 20m/s begin to slow at constant acceleration of 8.00m/s2 along a straight line find the average speed for the 5al.S interval
Answer:
the final velocity of the bus is -20 m/s.
Explanation:
Given;
initial velocity of the bus, u = 20 m/s
deceleration of the bus, -a = 8 m/s²
time of motion, t = 5 s
The final velocity of the bus is calculated as;
v = u + at
v = 20 + (-8 x 5)
v = 20 - 40
v = -20 m/s.
Therefore, the final velocity of the bus is -20 m/s.
In an experiment, some magnesium ribbon is weighed and its mass is recorded. It is then placed in a crucible and heated. Once hot
enough, it combines with oxygen to form magnesium oxide (Mgo). Observe the data table provided. Explain why the law of
conservation of mass appears violated.
les -
A)
The mass of the magnesium oxide was not calculated correctly.
B)
The mass of the oxygen does not equal the other two substances.
C)
The masses of the products and reactants look like they are equal.
D)
The mass of the magnesium oxide does not add up to the oxygen and
magnesium
Answer:
D. The mass of the magnesium oxide does not add up to the oxygen and magnesium.
Explanation:
The oxygen and magnesium should match the Magnesium Oxide.
Answer:
i agree the answer is (D)The mass of the magnesium oxide does not add up to the oxygen and magnesium
Two forces,one of 12 N and another of 24 N,act on a body in such a way that they make an angle of 90degree with each other.Find the resultant of the two forces
Answer:
26.83 N.
Explanation:
If the angle between two vector is 90°, to get the resultant, we use Pythagoras theorem.
a² = b²+c²......................... Equation 1
Where a = R = Resultant, b = 12 N, c = 24 N.
Substitute these values into equation 1
R² = 12²+24²
R² = 144+576
R² = 720
√R² = √720
R = 26.83 N.
Hence, the result of the two force is 26.83 N.
In a head on collision, if you aren’t wearing your seatbelt you could go through the window. What Law is being applied?
Answer:
inertia
..............
Answer:law of inertia
Explanation:
what is more reactive calcium or strontium?
Answer:
Calcium is less reactive than strontium.
hope it helps
QUICK WILL GIVE BRAINLIEST EDG 2021
What is the best prediction for what will happen when all of the hydrogen in the sun has undergone fusion?
Helium nuclei will split to form hydrogen and the sun will no longer release energy.
Helium nuclei will split to form hydrogen and the sun will continue to release energy.
Helium nuclei will fuse to create heavier elements but the sun will no longer release energy.
Helium nuclei will fuse to crazy heavier elements and the sun will confuse to release energy.
Answer:
Helium nuclei will split to form hydrogen and the sun will no longer release energy.
Explanation:
:)
When all the hydrogen in the sun has gone for fusion, helium nuclei will split to form hydrogen and the sun will continue to release energy.
What is nuclear fusion?The term nuclear fusion has to do with the combination of two or more nuclei to obtain a larger nuclei with the emission of a tremendous amount of energy.
Hence, when all the hydrogen in the sun has gone for fusion, helium nuclei will split to form hydrogen and the sun will continue to release energy.
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Help greatly appreciated.
Use the links to answer the question.(I mean, you don't HAVE to if you prefer not to if you have already found the answer or would prefer to look it up yourself).
#1: http://www.seasky.org/space-exploration/astronomers-isaac-newton.html
#2: https://www.space.com/newtons-laws-of-motion-explained.html
#3: https://www.universetoday.com/91785/isaac-newton/
Write a short 6 sentence summary answering this: How did Newton alter the Solar System model proposed by Kepler and what other contributions did he make to Astronomy?
Thank you all for helping me! you saved my grade by a lot!
Answer:
If Kepler’s laws define the motion of the planets, Newton’s laws define motion. Thinking on Kepler’s laws, Newton realized that all motion, whether it was the orbit of the Moon around the Earth or an apple falling from a tree, followed the same basic principles. “To the same natural effects,” he wrote, “we must, as far as possible, assign the same causes.” Previous Aristotelian thinking, physicist Stephen Hawking has written, assigned different causes to different types of motion. By unifying all motion, Newton shifted the scientific perspective to a search for large, unifying patterns in nature. Newton outlined his laws in Philosophiae Naturalis Principia Mathematica (“Mathematical Principles of Natural Philosophy,”) published in 1687.
Law I. Every body perseveres in its state of rest, or of uniform motion in a right line, unless it is compelled to change that state by forces impressed theron.
In essence, a moving object won’t change speed or direction, nor will a still object start moving, unless some outside force acts on it. The law is regularly summed up in one word: inertia.
Law II. The alteration of motion is ever proportional to the motive force impressed; and is made in the direction of the right line in which that force is impressed.
Newton’s second law is most recognizable in its mathematical form, the iconic equation: F=ma. The strength of the force (F) is defined by how much it changes the motion (acceleration, a) of an object with some mass (m).
Law III. To every action there is always opposed an equal reaction: or the mutual actions of two bodies upon each other are always equal, and directed to contrary parts.
As Newton himself described: “If you press a stone with your finger, the finger is also pressed by the stone.”
Explanation:
Hope this helps I cant say what I wrote is 100% correct so use at your own risk.
A wave with a frequency of 10 Hz and wavelength of 12m has what velocity?
The equations you will need:
v = λ x f λ=v/f f=v/λ
Answer:
120
Explanation:
lambda = 12
f=10
10×12=120
1.Two materials that can be scratched by an iron mail are ___, ___
2.What is the substance that can be scratched by an iron nail but not a penny?
Please answer
Answer:
1. Two materials that can be scratched by an iron nail are zinc and aluminum
2. A substance that can be scratched by an iron nail but not a penny is;
Nickel
Explanation:
The hardness of a material can be defined as its ability to resist being plastically deformed at a location due to mechanical scratching, abrasion or indentation
The Mohs hardness scale provides a ranking of materials in the order of hardness with a material having a higher Mohs hardness number being able to scratch other materials which have a lower Mohs hardness number
1. From the Mohs scale of hardness, iron which has an harness number of 4.5 can scratch zinc which has an harness number of 2.5, and iron can also scratch aluminum which has an hardness number of 2.5 to 3
2. A penny is made from copper plated material and will have an outer layer hardness of copper which has an hardness number of 3 on the Mohs scale
Therefore, a penny cannot scratch a material mode of nickel which has an hardness number of 4, while iron which has an hardness of 4.5 will scratch a nickel material
(1) Zinc and aluminum can be scratched by an iron nail.
(2) Nickel can be scratched by an iron nail but not a penny.
Hardness and deformation:The hardness of a material is defined as its ability to resist deformation due to mechanical scratching, abrasion, or indentation.
According to the Mohs hardness scale, a material having a higher Mohs hardness number is able to scratch other materials which have a lower Mohs hardness number.
From the Mohs scale of hardness, iron has a hardness number of 4.5, zinc has a hardness number of 2.5, and aluminum which has a hardness number between 2.5 to 3. So, iron can scratch both, Zinc and Aluminium.
A penny is made from copper-plated material copper has a hardness number of 3 on the Mohs scale. Whereas Nickel has a hardness number of 4. Therefore, a penny cannot scratch a material made of Nickel.
Learn more about hardness:
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please helpppp
Explain the difference between mass and weight and how they are measured.
There is a basic difference, because mass is the actual amount of material contained in a body and is measuredin kg, gm, etc. Whereas weight is the force exerted by the gravity on that object mg. Note that mass is independent of everything but weight is different on the earth
Mass is the matter in a material, while weight is the measure of how the force of gravity acts upon that mass.
High energy waves have what
Answer:
It means that the frequency will be a lot higher with a shorter wave.
What is a disadvantage of using biomass as an energy resource?
A. Biomass produces a less efficient fuel
B. Biomass is available almost everywhere
C. Biomass is a renewable energy resource
D. Biomass releases less harmful emission gases
Answer:
hope this helps i think the answer is C
Answer:
it is A) biomass produces a less efficent fuel
Explanation:
the rest are advantages
how to use a circuit breaker
?
Answer:
circuit breakers work in a similar way to fuses, and also protect the circuit from damage if too much current flows but work in a different way. when circuit breakers detect a surge in current in a circuit, they break the circuit by opening a switch. one type of circuit breaker used instead of a fuse and an earth wire is a Residual Current Circuit Breaker (RCCB)
20 POINTS PLSSS!!!!!! I WILL MARK YOU AS BRAINLIEST!!!!
1: When given a motion graph, how can you tell if it’s a speed graph or acceleration graph?
2: A plane takes 8 hours to fly 5000 km. What is its speed?
Which is not a step in the scientific method?
a. Problem or question
b. Ask other people for their opinion
O c. Formulate a hypothesis
O d. Arrive At a conclusion
HURRY PLEASE
Answer:
Umm I'm pretty sure is all of the above