Answer:
C-Mass
Explanation:
A student is cooking macaroni and cheese for dinner. The student places a pot on the stove, boils water in the pot, places noodles in the boiling water, and watches the noodles float and sink in the pot. Explain the types of heat transfer that are occurring as the student cooks the noodles.
Answer:
Conduction.
Convection.
Radiation.
what is force?what are the type of force?
Answer:
There are 2 types of forces, contact forces and act at a distance force. Forces. Every day you are using forces. Force is basically push and pull. When you push and pull you are applying a force to an object.The Four Fundamental Forces of Nature
Gravity.
The weak force.
Electromagnetism.
The strong force.
An 18 000-kg freight car travelling 1.75 m/s[E] collides with a 27 000-kg freight car at rest. After the collision, the freight cars stick together. What is the velocity of the freight cars after the collision?
Answer:
The velocity of the freight cars after collision is 0.7 m/s
Explanation:
Given;
mass of the first freight car, m₁ = 18000 kg
initial speed of the first freight car, u₁ = 1.75 m/s
mass of the second freight car, m₂ = 27000 kg
initial speed of the second freight car, u₂ = 0
Let the velocity of the freight cars after collision = v
Apply the principle of conservation of linear momentum;
m₁u₁ + m₂u₂ = v(m₁ + m₂)
18000(1.75) + 27000(0) = v(18000 + 27000)
31500 = 45000v
v = 31500 / 45000
v = 0.7 m/s
Therefore, the velocity of the freight cars after collision is 0.7 m/s
Im so bad at physics pls help I am so close to failing.
Answer:
the canon would be blasted .4/6 miles bc it s half of 9.8 which shows its signifigant expretion on the decimal point weather its a posative or negative
Explanation:
Hopefully this helped, if not HMU and I will try my best to get u a better answer!
Have a great day! :)
And if ur failing and u need help I can help u, no points needed :)
if we bring a 200. kg lunar rover to the moon, what will happen to its mass and weights? (g=1.6 m/s2 on the moon)
Answer:
W = 320 [N]
Explanation:
In order to solve this problem, we must take into account that weight is defined as the product of mass by gravity.
[tex]W=m*g[/tex]
where:
W = weight [N] (units of Newtons)
m = mass = 200 [kg]
g = gravity acceleration = 1.6 [m/s²]
The mass is always conserved, independent of the location of the body in space.
[tex]W = 200*1.6\\W = 320 [N][/tex]
which situation results in the most attraction between two magnets?
A. the north pole of one magnet is far away from the north pole of the other magnet.
B. the South pole of one magnet is near the South pole of the other magnet.
C. the north pole of one magnet is near the South pole of the other magnet.
D. The north pole of one magnet is far away from the South pole of the other magnet.
Answer:
C
Explanation:
Opposites attract, the north pole of one of the magnet is attracted to the south pole of the other magnet. Two north or south poles will repel away from each other.
The north pole of one magnet is near the South pole of the other magnet.
The ends of a magnet are called its poles. One end is called the north pole, the other is called the south pole. If you line up two magnets so that the south pole of one faces the north pole of the other, the magnets will pull toward each other. This is called attraction.
What is magnet ?"A magnet is a material or object that produces a magnetic field. This magnetic field is invisible but is responsible for the most notable property of a magnet: a force that pulls on other ferromagnetic materials, such as iron, steel, nickel, cobalt, etc. and attracts or repels other magnets."
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A block of mass 3 kg slides along a horizontal surface that has negligible friction except for one section, as shown above. The block arrives at the rough section with a speed of 5 m/s and leaves it 0.5 s later with a speed of 3 m/s.
Complete Question
The complete question is shown on the first uploaded image
Answer:
The value is [tex]F_f = 3 * -4[/tex]
Explanation:
From the question we are told that
The mass of the block is [tex]m = 3 \ kg[/tex]
The initial speed of the block before entering the rough section is [tex]u = 5 \ m/s[/tex]
The time taken is t = 0.5 s
The speed with which the block leaves the rough section is [tex]v = 3 \ m/s[/tex]
Generally from kinematic equation
[tex]v = u + at[/tex]
=> [tex]a = \frac{v - u }{t}[/tex]
=> [tex]a = \frac{3 - 5 }{0.5}[/tex]
=> [tex]a = - 4[/tex]
Generally the magnitude of the average frictional force is mathematically represented as
[tex]F_f = m * a[/tex]
=> [tex]F_f = 3 * -4[/tex]
=> [tex]F_f = -12 \ N[/tex]
The negative sign show that the force is acting in the opposite direction to the direction of motion of the block
The frictional force between the block and the horizontal surface is 12.1 N.
The given parameters;
mass of the block, m = 3 kginitial speed of block, u = 5 m/stime of motion, t = 0.5 sfinal speed, v = 3 m/sThe acceleration of the block is calculated as follows;
[tex]a = \frac{\Delta v}{t} \\\\a = \frac{5- 3}{0.5} \\\\a = 4 \ m/s^2[/tex]
The coefficient of friction between the block and the horizontal surface is calculated as;
[tex]\mu_k = \frac{a}{g} \\\\\mu_k = \frac{4}{9.8} \\\\\mu_k = 0.41[/tex]
The frictional force between the block and the horizontal surface is calculated as follows;
[tex]F_f = \mu_k F_n\\\\F_f = \mu_k mg\\\\F_f = 0.41 \times 3 \times 9.8\\\\F_f = 12 .1 \ N[/tex]
Thus, the frictional force between the block and the horizontal surface is 12.1 N.
"Your question is not complete, it seems to be missing the following information;"
A block of mass 3 kg slides along a horizontal surface that has negligible friction except for one section, as shown above. The block arrives at the rough section with a speed of 5 m/s and leaves it 0.5 s later with a speed of 3 m/s. What is the magnitude of the average frictional force exerted on the block by the rough section of the surface?
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lonic compounds form because ______ attract.
Plz help I need this now! :)
Answer:
I believe it is either Metals or Nonmetals
Explanation:
Hope this helped, Have a Wonderful Day/Night!!
What fraction of carbon-14 remains undecayed after 2,865 years?
Answer:
5,730 years
i literally took a test on this question yesterday, lol
Explanation:
Hopefully this helped, if not HMU and i will try my best to get u a better answer, and if u need help with anything just let me know and i got u! :)
In many situations, energy is lost to the work done by friction. But the law of conservation of energy says energy cannot be created or destroyed. So where does the "lost" energy go?
Answer:
Heat energy
Explanation:
The seemingly lost energy due to the work done by friction is lost to heat energy.
When we account for heat energy of the system, it is clearly seen that it is not lost as we perceive it.
The law of conservation of energy also suggests that energy is transformed and neither lost nor created. The work done by friction is transformed into heat energy of the system.This diagram shows two different forces acting on a skateboarder. The
combined mass of the skateboard and the person is 65.2 kg. Based on this
information, what is the acceleration of the skateboarder?
Air resistance = 55.20 N
Applied force = 31.80
si
A. 0.36 m/s2 to the left
B. 1.46 m/s2 to the left
C. 0.36 m/s2 to the right
D. 1.47m/s2 to the right
Answer:
Option A. 0.36 m/s to the left
Explanation:
From the question given above, the following data were obtained:
Force resistance (Fᵣ) = 55.2 N
Applied force (Fₐ) = 31.8 N
Mass (m) = 65.2 kg.
Acceleration (a) =?
Next, we shall determine the net force acting on the skateboarder. This can be obtained as illustrated below:
Force resistance (Fᵣ) = 55.2 N
Applied force (Fₐ) = 31.8 N
Net force (Fₙ) =?
Fₙ = Fᵣ – Fₐ
Fₙ = 55.2 – 31.8
Fₙ = 23.4 N to the left
Finally, we shall determine the acceleration of the skateboarder. This can be obtained as follow:
Mass (m) = 65.2 kg.
Net force (Fₙ) = 23.4 N to the left
Acceleration (a) =?
F = ma
23.4 = 65.2 × a
Divide both side by 65.2
a = 23.4 / 65.2
a = 0.36 m/s
Since the net force acting on the skateboarder is to the left. Therefore, the acceleration of the stakeholder will also be towards the left (i.e 0.36 m/s to the left)
Answer:
A. 0.36 m/s to the left
An escalator and an elevator can transport a person from one floor to the next. the escalator does it in 15 s and the elevator takes 10 s. Which does more work on the person? Which has the greater power output?
Answer:
The escalator does more work and the elevator has a greater power output.
Explanation:
The escalator does more work on the person because it is carrying them up. It also gives the person a chance to walk up the escalator making it a little more challenging than using just an elevator. The elevator has a greater power output because it can transport a person from one floor to another in just 10 seconds where as the escalator can do it in 15.
Hope this helps!
WHATS THE ANSWER HELP!!
5m I think,maybe, not a 100% sure die
Answer:
5m i think
Explanation:
WHATS THE ANSWER HELP!!
A softball has a mass of 0.18 kg. What is the gravitational force on Earth due to the ball, and what is the Earth's resulting acceleration? Earth's mass is 6.0 x 1024 kg.
Answer:F=1.7802
Explanation:
Since we've been given the mass to be .18kg,we are asked to find the Force of which the formulae is
F=ma where f-force,m-mass and a-acceleration due to gravity
So we can just substitute
F-?.m=.18 and a9.89
F=.18×9.89
F=1.7802N
The gravitational force on Earth due to the ball will be 1..769 N . While the Earth's resulting acceleration will be 2.9 ×10²³ m/sec².
What is gravitational force?Newton's law of gravity states that each particle having mass in the universe attracts each other particle with a force known as the gravitational force
The given data in the problem is;
m is the mass of ball=0.18 kg
F is the gravitational force=?
m is the mass of earth= 6.0 x 1024 kg.
r is the radius of earth = 6.3781×106 m
G is the universal gravitational constant= 6.67408×10-11 Nm/kg2
The gravitational force is given by;
[tex]\rm F_G=\frac{ G m_1m_2}{r^2} \\\\ \rm F_G=\frac{ 6.67 \times 10^{-11} 0.18 \times 6.0 \times 10^{24}}{6.3781\times 10^6)2}[/tex]
[tex]\rm F_G= 1.769 N[/tex]
Hence the gravitational force on Earth due to the ball will be 1..769 N.
The force is given as the product of mass and acceleration. So that the value of acceleration is found by;
[tex]\rm a= \frac{F}{m} \\\\ \rm a= \frac{1.769}{6.0 \times 10^{24}}[/tex]
[tex]\rm a= 2.9 \times10^{-23}[/tex] m/sec²
Hence the Earth's resulting acceleration will be 2.9 ×10²³ m/sec².
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3. When two liquids are mixed and a solid
forms as a reaction, the solid is called a
A. precipitate
B participant
C. percipitate
D. polypeptide
And why ?
Answer: A; Precipitate
Explanation:
Based on the graph, which data point is most likely to have experimental
error?
A. 72 kg
B. 59 kg
C. 62 kg
D. 48 kg
Answer:
B. 59 kg
Explanation:
From the graph you notice that a linear relation in indicated by the line joining the points such that the points on the line represent the data that show a correct relationship in the experiment.
This means that the point outside the line has an error .
This point is the value 59 kg that does not align with other values which are included in the graph.
Answer:
59kg
Explanation:
The radio waves that travel through the air to our car/truck/home radios are just another type of light. Let's say that your favorite radio station is 87.9 on the FM dial. That means that those radio waves have a frequency of 87.9 MHz. (a) What are the wavelength and energy of those radio waves? (b) How fast would these radio waves travel through water?
Answer:
Explanation:
(a) Electromagnetic waves travels at the speed of light = 3.0 x [tex]10^{8}[/tex] m/s.
v = fλ
where v is the velocity of the wave, f is the frequency, and λ wavelength.
So that;
λ = [tex]\frac{v}{f}[/tex]
= [tex]\frac{3.0*10^{8} }{87.9*10^{6} }[/tex]
= 3.413 m
ii. Enegy of the wave can be determined by;
E = hf
where h is the Planck's constant and f the frequency of the wave.
E = 6.626 x [tex]10^{-34}[/tex] x 87.9 x [tex]10^{6}[/tex]
= 5.82 x [tex]10^{-26}[/tex] J
(b) Refractive index of water = [tex]\frac{velocity of light in air}{velocity of light in water}[/tex]
velocity of light in water = 1.33 x 3.0 x [tex]10^{8}[/tex]
= 3.99 x [tex]10^{8}[/tex] m/s
Why don't protons stick together?
Answer:
The protons must feel a repulsive force from the other neighboring protons. This is where the strong nuclear force comes in. ... If they can't get that close, the strong force is too weak to make them stick together, and other competing forces (usually the electromagnetic force) can influence the particles to move apart.^o^
Answer:
Because, they are of the same charge that is, + and +, + can't go with another +.
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The air in a tire pump has a volume of 1.50L at a temperature of 5◦C. If the temperature is increased to 30◦C and the pressure remains constant, what is the new volume? Hurry Please!
Answer:
1.6L
Explanation:
Given parameters:
Initial volume = 1.5L
Initial temperature = 5°C = 5 + 273 = 278K
Final temperature = 30°C = 30 + 273 = 303K
Unknown:
Final or new volume = ?
Solution;
Since pressure is constant, we simply apply Charles's law to solve this problem.
Using the expression below,
[tex]\frac{V_{1} }{T_{1} }[/tex] = [tex]\frac{V_{2} }{T_{2} }[/tex]
V and T are volume and temperature
1 and 2 are initial and final states
Insert the parameters and solve;
[tex]\frac{1.5}{278}[/tex] = [tex]\frac{V_{2} }{303}[/tex]
278V₂ = 1.5 x 303
V₂ = 1.6L
The fact that objects fall to earth at the same speed is called
Answer:
The Equivalence Principle of Gravity
Explanation:
The fact that objects fall to earth at the same speed is called the Equivalence Principle of Gravity.
What is the Equivalence Principle of Gravity?According to the Equivalence Principle of Gravity, all things fall at the same rate when there is little to no air resistance. The value of the acceleration caused by gravity is demonstrated by the force of gravity equation to be a constant that is independent of the mass of the item.
According to Einstein's equivalence principle, it is unnecessary to distinguish between gravitational and inertial forces because they are comparable in nature.
The inertia force acts in the opposite direction of an object's accelerating force.As a result, the Einstein equivalence principle can be expressed as "the effects of gravity are exactly identical to the effects of acceleration."Therefore, the Equivalence Principle of Gravity states that all objects descend to Earth at the same rate.
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A hiker leaves her camp and walks 3.5 km in a direction of 55° south of west to the lake. After a short rest at the lake, she hikes 2.7 km in a direction of 16° east of south to the scenic overlook.
What is the magnitude of the hiker’s resultant displacement? Round your answer to the nearest tenth.
km
What is the direction of the hiker’s resultant displacement? Round your answer to nearest whole degree.
° south of west
Answer:
The magnitude of the hiker’s resultant displacement is 5.6 km
The direction of the hiker’s resultant displacement is 77 degrees south west! Hope this helps!!!
Kate gathered three boxes of the same size made of different materials: glass, clear plastic, and aluminum painted black. She placed them on a window sill in the sun for an hour and then measured the warmth of the air in each box. In this experiment, the time of an hour is a(n) _____.
A. Dependent Variable
B. Constant
C. Independent Variable
D. Control
In this experiment, the time of an hour is an independent variable, therefore the correct answer is option C
What is thermal energy?Thermal energy sometimes referred to as heat energy, may be described as the type of energy in which heat is transmitted from one body to another body as a result of their molecular motions.
As given in the problem Kate gathered three boxes of the same size made of different materials: glass, clear plastic, and aluminum painted black. She placed them on a window sill in the sun for an hour and then measured the warmth of the air in each box.
As stated, all three boxes were put on the window for the same amount of time—an hour—so since the time duration for the experiment was the same, it may be considered an independent variable.
Thus, In this experiment, the time of an hour is an independent variable, therefore the correct answer is option C.
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A force of 5N pushes a ball to the right, and a force of 7N pushes the ball to the left. How will the forces affect the ball’s motion?
answer:- external force is 2 N .
The force that impacts the ball motion is external force i.e. 2N.
Given that,
A force of 5N pushes a ball to the right. And a force of 7N pushes the ball to the left.Based on the above information, the calculation is as follows:
= 7N - 5N
= 2N
This 2N represents the external force.
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By what factor will the Electrostatic Force between two charged objects change when the amount of charge on both objects doubles AND the distance between the two charged objects triples?
Answer:
F' = (4/9)F
Explanation:
The electrostatic force between two charged objects is given by Coulomb's Law:
F = kq₁q₂/r² -------------------- equation (1)
where,
F = Electrostatic Force
k = Coulomb's Constant
q₁ = magnitude of first charge
q₂ = magnitude of second charge
r = distance between charges
Now, when the charges and distance altered as follows:
q₁' = 2q₁
q₂' = 2q₂
r' = 3r
Then,
F' = kq₁'q₂'/r'²
F' = k(2q₁)(2q₂)/(3r)²
F' = (4/9)kq₁q₂/r²
using equation (1):
F' = (4/9)F
when is the cats average accelerstion from 12 to 24 seconds
FIRST ONE TO GET IT RIGHT WILL GET 25 POINTS
Answer:
8
Explanation:
im gonna say 8 because the peak of the line would be at 8 not to sure 0-0
Which of these pairs of quantities is used to describe the transfer of energy to or from a substance? A. heat and work B. heat and kinetic energy C. work and potential energy D. potential energy and kinetic energy
Answer:
B. heat and kinetic energy
Explanation:
Heat is a form of energy that flows with respect to temperature difference. Thus, heat energy would flow from an object with higher temperature to that at lower temperature. It generally cascades from a high temperature body to lower temperature body through a medium or when in contact.
Kinetic energy is the energy that is inherent in a moving object. Thus, it can be converted to other forms or transferred between objects. Example, a moving object can transfer part of its kinetic energy to an object at rest on collision. This may cause the motion of the initial stationary object.
Therefore, heat and kinetic energy can be used to describe transfer of energy to or from a substance.
The diagram shows a sealed container, which
represents a closed system.
How would the system change if the container were
placed on a hot plate?
O Some kinetic energy would be produced.
O Some kinetic energy would be destroyed.
O The kinetic energy of the molecules would increase.
O The kinetic energy of the molecules would decrease.
Molecules
Answer:
The kinetic energy of the molecules would increase.
Explanation:
Answer:
C. The kinetic energy of the molecules would increase.
Explanation:
On Edge 2021
What is the density of wood
i hope it will help you
Explanation:
density to the amount of wood in a unit , per volume of wood. the ratio of dry weight and green volume of the given wood is basic wood density.
You are enjoying a ride on a Ferris Wheel. The wheel has a circumference of 1,250m. The velocity of the wheel is 12m/s. How many minutes is one trip around the wheel?
Answer:
Time = 1.44 minutes
Explanation:
Given that the circumference of the wheel is 1250 m, which is the distance to be covered.
Thus,
speed =
distance = 1250 m, speed = 12 m/s.
So that;
12 =
time =
= 104.16667
time = 104.17 s
But, 60 seconds = 1 minute
time = 1.4417
= 1.44 minutes
The time required for one trip around the wheel is 1.44 minutes.
Gless has a hardness that is in the middle of the hardness scale. What is the hardness of Glass?
Answer:
5.5 to 7 Mohs
Explanation:
Glass ranks around 5.5 to 7 Mohs, but sapphire crystal has a hardness of 9 Mohs, making it only slightly less hard than diamond.
Answer: 5.5
Explanation:
Several hardness scales have been developed to catalog the materials (specifical minerals), being the Mohs scale the best known. This scale, proposed by the German geologist Friedrich Mohs in 1825, consists of a ratio of ten minerals numbered in increasing order by hardness, from least to greatest.