A girl pushes herself up a steep ramp in her
wheelchair. She gains a vertical distance of
25.8 m when she reaches the top of the ramp.
She turns around and coasts back down the ramp
If the combined mass of the girl and her wheelchair
is 64.6 kg, what would be her coasting speed at the
bottom of the ramp?!Show all your work.
Answer:
22.5m/s, this is assuming conservation of energy and that the girl starts coasting from rest
Explanation:
conservation of energy: mgh = 1/2 m*v^2
h = 25.8m, m = 64.6kg, g=9.81m/s^2
plug in and solve for v
v = sqrt(2gh) = sqrt(2*9.81*25.8) = 22.5m/s
The coasting speed of the girl at the bottom of the ramp would be approximately 22.4 m/s.
To find the coasting speed at the bottom of the ramp, we can apply the conservation of energy principle. At the top of the ramp, the initial potential energy is converted into kinetic energy at the bottom of the ramp.
Calculate the potential energy at the top of the ramp:
Potential energy (PE) = mass (m) * acceleration due to gravity (g) * height (h)
PE = 64.6 kg * 9.8 m/s² * 25.8 m = 16114.284 J
At the bottom of the ramp, all the potential energy will be converted into kinetic energy:
Kinetic energy (KE) = 0.5 * mass (m) * velocity²
16114.284 J = 0.5 * 64.6 kg * velocity²
Solve for velocity:
velocity² = 2 * (16114.284 J) / 64.6 kg
velocity² = 500 m²/s²
velocity = √(500 m²/s²) ≈ 22.4 m/s
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please help and solve
I am sorry I can not tell what the drawing is
Explanation:
A child jumps from a moving sled with a speed of 2.2 m/s and in the direction opposite the sled's motion. The sled continues to move in the forward direction, but with a new speed of 5.5 m/s. If the child has a mass of 38 kg and the sled has a mass 68 kg, what is the initial velocity of the sled?
Answer:
p=mv , m1*v1 = m2*v2 , 2.2*38 = 68*v2 -> v2=1.23 , vf=vi+v2 -> vi=vf-v2 -> vi=5.5-1.23=4.27
my apologies if it's wrong
let the child jump, do ur work~~~
hope helpz~
When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. What type of change is it? Explain.
Best Answer will be marked as brainliest
[tex]\large{\underline{\underline{\pmb{\frak {\color {red}{Question:}}}}}}[/tex]
[tex] \sf \red{When \: baking \: soda \: is \: mixed \: with \: lemon \: juice, \: bubbles \: are \: formed \: with \: the \: evolution \: of \: a \: gas.}[/tex]
[tex]\large{\underline{\underline{\pmb{\frak {\color {blue}{Answer:}}}}}}[/tex]
When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. The gas is formed in the reaction is Carbon dioxide. [tex] CO_{2}[/tex] is formed.
The change which happened in this reaction is a chemical change.
[tex] \boxed{ \frak \green{Explanation}}[/tex]
Since, in chemical change we can't bring a substance to it's actual form how it was in earlier.
Examples: burning of paper is chemical, since we can't get the fine paper again after it is burnt.
Thus, the above reaction is also a chemical change, since we can't get back the lemon juice how it was earlier.
[tex] \boxed{ \frak \red{Brainlysamurai}}[/tex]
Which statement describes a chemical property related to the
particles that make up the material?
O
A. Magnesium oxide crystals are hard and brittle because
they are made up of atoms that combine by ionic bonding.
O B. Iron is a good conductor of electricity because the metallic
bonds between its atoms allow electrons to move freely.
O c. Aluminum has a relatively low density because its atoms
have fewer protons than the atoms of most other metals.
O D. Aluminum is relatively inert because its atoms do not react
readily with molecules in the atmosphere.
Iron is a good conductor of electricity because the metallic bonds between its atoms allow electrons to move freely.
What is Chemical property?These are the features which can be observed when the substance undergoes a chemical reaction.
Good conductor of electricity is a chemical property and is common among metals as a result of the metallic bonds which is why option B was chosen.
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The heat of fusion for ice at 0°C is 333.7 kJ/kg, the specific heat of water 4.186 kJ/kg °C, and the heat of vaporization of water
at 100°C is 2,256 kJ/kg. What is the energy needed to vaporize 100 grams of ice at starting at 0°C?
Select one:
500 kJ
The energy needed to vaporize 100 grams of ice at starting at 0°C is 300.83 kJ.
What is heating?When the temperature is increased , the body or particle is said to be heating.
Given is the mass of water =100g =0.1 kg, Latent heat of fusion L = 333.7 kJ/kg,
Energy required to melt ice into water at 0°C.
Q₁ = mL
Q₁ = 0.1 x 333.7
Q₁ = 33.37 kJ
Energy required to heat water from 0°C to 100°C is
Q₂ = mCΔT
Q₂ = 0.1 x 4.186 x 100
Q₂ = 41.86 J
Energy required to vaporize at 100°C is
Q₃ = m Lv
Q₃ = 0.1 x 2256
Q₃ = 225.6 kJ
Total heat to vaporize 100 grams of ice at starting at 0°C is
Q = Q₁ +Q₂ +Q₃
Q = 33.37 +41.86 +225.6
Q = 300.83 kJ
Thus, the energy needed to vaporize 100 grams of ice at starting at 0°C is 300.83 kJ
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what is a geostationary satellite
Answer:
See below
Explanation:
Geostationary satellites are placed in orbit above the equator at an orbital altitude of 35786 km in order to perfectly match the earth's rotation...thus they APPEAR stationary in the sky ..... then your DISH TV antenna (etc) can point in one direction at them for continuous communication. Or.... a spy or weather satellite would be able to look at one section of the earth non-stop
One Affective way to develop the feeling function in one’s personality is to

A. Imagine how other people might feel in the situation
B. Plan out the details for each week
C. Socialize more with strangers
D. Consider the consequences of one’s actions
Answer:
A.
Explanation:
I think it’s a. Because, I normally think about how someone else feels if I want to say something.
If I bought 59 kids off the black market in a secret door in the stalls and I sell 21 kids then ask for 81 more then 12 off the kids runaway in speed of 6 miles and I get in my ice cream truck/van and forget 9 kids and 4 kids out run my ice cream truck/van and I catch 8 of them How Many Do I Have? I'll give a Brainlist.
You will be left with 106 kids
Meaning of word problem
A word problem can be defined as a mathematical problem that is written in word or written in a sentence format.
In a word problem, the student is expected to decode the sentence into a mathematical expression before solving
In conclusion, You will be left with 106 kids
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find potential at a point on the line , containing two charges " q " and " 4q " at a distance of " r " metres , where net E due to these charges is same.
The potential at a point on the line will be,[tex]\rm E_{net}=\frac{5Kq}{r}[/tex].The net potential is the algebraic sum of the electric potential.
What is the electrical potential difference?The amount of work performed in an electrical field to move a unit charge from one location to another is defined as the electrical potential difference.
In other terms, the potential difference is the difference in electric potential between two charged substances.
The traditional current flow is from positive to negative terminals, indicating the movement of positive charges in that direction.
[tex]\rm E_1 = \frac{Kq}{r} \\\\ E_2=\frac{K(4q)}{r}[/tex]
The potential at a point on the line is found as;
[tex]\rm E_{net}=E_1+E_2 \\\\\ E_{net}=\frac{Kq}{r} +\frac{K(4q)}{r} \\\\E_{net}=\frac{5Kq}{r}[/tex]
Hence, the potential at a point on the line will be,[tex]\rm E_{net}=\frac{5Kq}{r}[/tex]
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Question 4 (2 points)
Which one of the following is not a leg muscle?
a) Teres Major muscle
b) Plantaris tendon
c) Sartorius muscle
d ) Semimembranosus muscle
The answer is a) Teres Major Muscle
Perform an experiment in which you roll a ball 43,700 cm before it comes to a stop. Write this measurement in scientific notation
The number 43,700 cm when written by the use of the scientific notation will be written as 4.37 * 10^4 cm.
What is the scientific notation?The scientific notation involves writing a number in such a way that it does not involve a lot of digits. This methods helps us to save space that would have been used to write long digits.
Hence, the number 43,700 cm when written by the use of the scientific notation will be written as 4.37 * 10^4 cm.
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which of the following is a key to your success in this pe course
A key to an individual's success in this PE course is honesty.
What is PE?PE is an acronym for physical education and it can be defined as a course (subject) which is taught in schools, so as to provide students with information on how to promote good health and physical fitness.
Some of the factors that affects a student's success in different physical education (PE) courses include the following:
Being in top physical shapeA good memoryGood eyesightHonestyIn this scenario, honesty is key to an individual's success in this PE course.
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Explain between the cause of high probability of accidents of loaded vehicles in over speed on the basis of the first law of motion.
Cause of high probability of accidents of loaded vehicles in over speed effected by momentum on the basis of first law of motion.
What does Newton's first law say?When we are standing inside a bus and it brakes abruptly, due to inertia, we are thrown forward. When a car is going around a curve it is necessary for a force to act, otherwise the car will go in a straight line.
the cause of high probability of accidents of loaded vehicles in over speed occurs large amount of momentum.
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Three sticks are arranged to form a right triangle. If the lengths of the three sticks are 0.47 m, 0.62 m and 0.78 m, what are the three angles of the triangle?
Which dog has the most kinetic energy? A. A dog of mass 12 kg running with speed 6 m/s B. A dog of mass 10 kg running with speed 3 m/s C. A dog of mass 16 kg running with speed 5 m/s D. A dog of mass 14 kg running with speed 4 m/s
Answer:
A
Explanation:
KE = 1/2 m v^2
the greatest is A
the magnitude of the momentum of a car is 13,300 kg*m/s if it has a speed of 14 m/s what is the mass of the car?
As elements gain more electrons in their outer shells, their electrical
conductivity generally decreases. Which of the following explains this
phenomenon?
Electrical conductivity often decreases, when elements receive additional electrons in their outer shells. As a result of the valence shell being filled, the number of movable electrons decreases.
What is a mobile electron?Electrons are mobile charges in the conduction band while holes are mobile charges in the valence band.
Current flow in a semiconductor is caused by charge carrier migration in both the conduction and valence bands.
Which creates a net motion of positively charged carriers in the same direction as the field and negatively charged carriers in the opposite direction as a result of the force.
The outermost electrons in metals are not bonded to each atom which is shared by many atoms. This decentralization is what allows metals to conduct electric currents.
Hence, the elements gain more electrons in their outer shells, and their electrical conductivity generally decreases.
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How do a neutron and a proton compare?
O
A. The proton has much greater mass.
O
B. The proton is farther from the nucleus.
O
C. They have opposite charges.
O
D. They are both found inside the nucleus.
[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]
The Correct choice is : D
Neutrons and Protons are collectively known as Neucleons because they are found in nucleus of the cell and they have almost equal mass, [ but neutron has slightly greater mass than proton ]. also, Neutrons are neutral particle with no charge on them, where as protons have positive charge on them. making nucleus positively charged altogether ~
Answer:
Option D
Explanation:
Remember that neutrons and protons both are found inside the nucleus.Electrons wander around themProtons have positive chargeElectrons have negative chargeNeutrons are neutralA student wants to know: “How does the number of lightbulbs affect current in a series circuit?” Identify the independent and dependent variables in the experiment.
The number of lightbulbs in a series circuit will not affect the current flowing through them. The independent variable is resistance. The dependent variable is voltage.
What is current?The current is the stream of charges which flow inside the conductors when connected across the end of voltage.
For the given set of series bulbs as resistors, the current flowing through all the bulbs will the same. Voltage is divided to each resistor.
From the Ohm's law, V =IR
R = V/I
Here, R is the proportionality constant. So, this is independent value.
The voltage difference across the resistors dependent on the current flowing through that resistance.
Thus, the number of lightbulbs in a series circuit will not affect the current flowing through them. The independent variable is resistance. The dependent variable is voltage.
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an aluminium object has a mass of 27kg and density of 2700 the object is atached to a spring and immerged in a tank of water determine. what is volum of object ?
Answer:
0.01m^3
Explanation:
m=27
density=2700
density=mass/volume
2700=27/volume
volume=27/2700=0.01
x(t)=t^2-2t+1 when does it comes to rest?
Answer:
x(t) = t^2 - 2 t + 1 given
v = dx / dt = 2 t - 2 = 0
t = 1
It comes to rest after 1 second
What are you and the Australian Institute of Marine Biology trying to find out and 4. Why might it be important to find this information out
Answer:
Established in 1972 by the McMahon Government, the institute's primary function is research for sustainable use and protection of the marine environment. The Institute investigates topics from broad-scale ecology to microbiology.
a steam engine work on its vicinity 285 k heat is released with the help of 225 c energy absorbed to the system what is the efficiency of steam engine explain the use of the rest of the energy physic problem
The efficiency of the steam engine is 78.9% because the rest of the work input is used to overcome friction.
What is efficiency of machines?Efficiency of a machine expresses the useful work done by a a machine as a percentage.
Efficiency of a machine = work output/work input × 100 %%The efficiency of machines are always less than 100% percent due to energy losses due to friction and heat.
For the steam engine:
Work output = 225 J
Work input = 285 J
Efficiency = 225/285 × 100% = 78.9 %
Therefore, the efficiency of the steam engine is 78.9% because the rest of the work input is used to overcome friction.
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A marble rolls off a tabletop 1.15 m high and hits the floor at a point 4 m away from the tables edge in the
horizontal direction.
a. How long is the marble in the air?
b. What is the speed of the marble when it leaves the tables edge?
Im/s
C. What is its speed when it hits the floor?
A marble rolls off a tabletop 1.15 m high and hits the floor at a point 4 m away from the edge of the table in the horizontal direction,
t= 0.45 seconds.V=2.22m/sVT=4.95 m/sThis is further explained below.
What is its speed when it hits the floor...?Generally, the equation for motion is mathematically given as
S= ut + 0.5at²
Therefore
y = Voy t + 0.5gt^2
1 = 0.5x 98 x 6²
1=4.9t^2
[tex]t=\sqrt{0.2041 }[/tex]
t= 0.45 seconds.
b) Horizontal motions are uniform.
V=Horizontal displacement/time
V=1/0.45
V=2.22m/s
C)
Vx: 2.22 m/s At bottom,
Vy² = Voy² + 2as
Vy² = 2x95x1
Vy² = 19.6
Total velocity
[tex]VT=\sqrt{( 2.22 m/)^2+19.6}[/tex]
VT=4.95 m/s
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food does not pass through the liver or the pancreas why are these organs dtill important parts of the digestive system?
Your pancreas makes a digestive juice that has enzymes that break down carbohydrates, fats, and proteins. The pancreas delivers the digestive juice to the small intestine through small tubes called ducts. Liver. Your liver makes a digestive juice called bile that helps digest fats and some vitamins.
Digestive enzymes are made by the pancreas and aid in the breakdown of proteins, carbs, and lipids. Bile, a liquid made by the liver that aids in fat digestion, is produced.
What is meant by digestive system ?The digestive system breaks down the food we consume into its most basic components, such as glucose (sugar), amino acids (which make up protein), or fatty acids (which make up lipids).
Here,
The digestive system of humans is made up of a fully formed alimentary canal and the glands that are located there. The alimentary canal, which includes the mouth, oral cavity or buccal cavity, pharynx, oesophagus, stomach, small intestine, large intestine, and anus, is encircled by glandular epithelium.
The nutrients from the digested food are subsequently transported to every cell in the body thanks to absorption into the bloodstream from the small intestine.
Although they are not a part of the alimentary canal, the pancreas, which is located beneath the stomach, the gallbladder, and the liver are all vital for digestion.
Hence,
Digestive enzymes are made by the pancreas and aid in the breakdown of proteins, carbs, and lipids. Bile, a liquid made by the liver that aids in fat digestion, is produced.
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An ocean liner leaves New York City and travels 18.0o north of east for 155 km. How far east and how far north has it gone? In other words, what are the magnitudes of the components of the ship’s displacement vector in the north and the east direction, respectively?
Which of these accurately identify characteristics of light and mechanical waves? Select the TWO (2) that apply.
A. Light waves are electromagnetic waves that can travel through a vacuum.
B. Mechanical waves can travel through a vacuum
C. Light waves need a medium through which to travel.
D. Water waves are examples of mechanical waves.
The two correct statement are A and B. Light waves are electromagnetic waves that can travel through a vacuum. Mechanical waves can travel through a vacuum.
What is an electromagnetic wave?
EM waves are the electromagnetic radiations are made up of electromagnetic waves created when an electric field collides with a magnetic field.
Electromagnetic waves may alternatively be defined as the combination of oscillating electric and magnetic fields.
Electrically charged particles experiencing acceleration create electromagnetic waves, which can then interact with other charged particles and exert force on them.
The two correct statement is;
1. Light waves are electromagnetic waves that can travel through a vacuum.
2. Mechanical waves can travel through a vacuum.
Hence,two correct statement are A and B.
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In what direction will each of the wires below move?
Answer:
Explanation: ckeck this imageA 208.4 N force is pulling a 197 kg object across a horizontal surface.
The 208.4 N force acts at 32 degrees above the horizontal.
The coefficient of kinetic friction between the object and the surface is 0.455,
and the object is moved 161.5 m.
What work is done by the pulling force?
.
What work is done by kinetic friction?
.
Work done
FscosØ208.4(161.5)cos3233656.6cos3228542.4JWork done by kinetic friction:-
[tex]\mu_kN[/tex][tex]\sf \mu_Kmg[/tex]0.455(197)(9.8)878.423NAnswer:
The Work done is 28542.4J.
The work done by the kinetic friction is 878.423N
Given:
FscosØ
We put the values together.
208.4(161.5)cos32
33656.6cos32
28542.4J
Work done by kinetic friction:-
Given the formula, we put the values.
0.455(197)(9.8)
878.423N