8: As a grade-school project, students construct a mobile representing some of the major food groups.
Their completed artwork is shown below. Find the masses mi, m2, and m3 that are required for a
perfectly balanced mobile.
Answers
Answer:
m1=0.72kg m2=0.48kg m3=0.98
Explanation:
12*m1=18*m2, so 2*m1=3*m2
6*(m1+m2)=24*.03, so 2*m1+2*m2=2.4
so, 5*m2=2.4, m2=0.48 then, m1=0.72
(m1+m2+0.3+0.2)*18=31*m3
1.7*18=31*m3
m3=0.98
Related Questions
The table shows the specific heat capacities of various substances. An iron block of mass 2kg is heated. Calculate the amount of energy needed to raise its temperature from 20°C to 30°C. Use the table to help you.
Answers
Answer:
9000 J
Explanation:
what is simple machine
Answers
Answer:
ϟ [tex] \huge{ \boxed{ \purple{ \text{Simple \: Machine}}}}[/tex]
⤥ We use different types of devices in our life to make our work easier. A spade is used to dig , a broom is used to sweep , a hammer is used to pass a nail on the wall and a plank is used to drag a load up to a certain height. All these simple things or devices , which are used in our daily life are called simple machines. Such simple machines do not do our work themselves but we have to use force on them to work with them. Thus , Simple machines are those tools or devices which make our work easier and convenient to do in the direction of force.
Hope I helped ! ッ
Have a wonderful day / night ♡
▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁
Explanation:
a simple machine is a device having simple structure which makes our work is a faster and more convenient.
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Usually, large amount of curent flows in a
Circuit due to two reasons ———— and ————.
Answers
Answer:
Explanation:
Possible causes for overcurrent include short circuits, excessive load, incorrect design, an arc fault, or a ground fault. Fuses, circuit breakers, and current limiters are commonly used overcurrent protection (OCP) mechanisms to control the risks
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The direct transfer of heat from one substance to another substance that is touching or in direct contact is referred to as...
Answers
Answer:
Heat refers to the energy transferred from a hotter object to a cooler one. Heat is transferred in three ways: radiation, conduction, and convection. ... The direct transfer of heat from one substance to another substance that it is touching is called conduction.
Explanation:
Deanna’s niece loves to swing at the local playground, so Deanna takes her and pushes her on the swing. Deanna must use (motion / transfer / force / energy) to exert a (transfer / motion / force / energy) that causes the swing to change (force / energy / motion / transfer/position). Answer PLsssssss
Answers
Answer:
Force
Motion
position
Explanation:
Deanna's niece loves to swing at the local playground, so Deanna takes her and pushes her on the swing. Deanna must use force to exert a motion that causes the swing to change position.
A force is a push or pull on a body. The type of force applied by Deanna is called a contact force because Deanna's hand is in contact with the swing. When the force is applied, the swing moves and motion occurs. The to and fro movement of the swing is the motion resulting from the applied force. So, as motion occurs, the position of the swing changes.According to Archimedes' Principle, what condition has to be met for an object to float?you will get branliest
Answers
Explanation:
The buoyant force must be greater to float, otherwise it would sink, its like a barrel in water, the more water weight in it the more it sinks, the more air weight the more it rises.
teacher drops a book to wake up his class, and the book hits the ground after 0.5 seconds. How high was the book?
Answers
3. An earthquake occurs at 12:02 p.m. A seismic station records the first S-wave at 12:19 p.m. Which set
of data shows the approximate arrival time of the first P-wave and the distance to epicenter
Answers
Answer:
what y'all teachers be on
Hen Mount St. Helen's erupted in 1980, it sent volcanic ash 18 kilometers into Earth's atmosphere. Which portions of Earth's atmosphere were contaminated by the volcanic ash?
Answers
Answer:
Astronomical location of Mount St. Helen's is 46°12′01″N 122°11′22″O, meaning that such statovolcano is located at middle latitudes. In middle latitudes, troposphere is 17 kilometers high, which is below stratosphere, whose height is 10 kilometers at middle latitudes. Hence, the eruption of Mount St. Helen's in 1980 contiminated troposphere and lower parts of stratosphere due to volcanic ash.
Explanation:
Astronomical location of Mount St. Helen's is 46°12′01″N 122°11′22″O, meaning that such statovolcano is located at middle latitudes. In middle latitudes, troposphere is 17 kilometers high, which is below stratosphere, whose height is 10 kilometers at middle latitudes. Hence, the eruption of Mount St. Helen's in 1980 contiminated troposphere and lower parts of stratosphere due to volcanic ash.
If you were to look at grains of table salt with a magnifying glass, you would see that each grain is a little cube. Why are salt grains cubical?
Answers
Answer:
All extended structure compounds form cubes. Sodium and chlorine atoms both have cubical shapes. In the extended structure of NaCI, atoms are arranged in a cubical pattern
How fast does a 500 Hz wave travel if its wavelength is 0.5 m?
Answers
Answer:
250 m/s
Explanation:
Answer:
250m/s
Explanation:
Frequency = velocity/wavelength
Then rearrange,
Velocity = frequency x wavelength
Velocity = 500 x 9.5 = 250m/s
why is solid carbon dioxide known as dry ice
Answers
Hey there..
It gets this name because it does not melt into a liquid when heated; instead, it changes directly into a gas (a process known as sublimation).
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what kind of energy is called mechanical energy?
Answers
Answer:
can be called kinetic or potential energy
Explanation:
Date:
A body has a mass m and velocity v , if the mass is increased to 4 times and velocity is decreased to 2 times calculate the ratio of kinetic energy
Answers
Explanation:
Mass = m
Velocity = v
If Mass is increased 4 times = 4m
New velocity = 2v
Kinetic Energy
[tex] \frac{1}{2}m {v}^{2} [/tex]
So it will be 1/2 × 4m × 2v × 2v
[tex]8m {v}^{2} [/tex]
so Kinetic Energy will increase 4 times
A2.0kg arrow is fired at 10m/s into a stationary 10 kg block of ice as shown below: the arrow sticks into the block of ice and they start moving . What is the velocity of the arrow/ice combination after the collison
Answers
Answer:
the velocity is 1.67 m/s
Explanation:
The computation of the velocity of the arrow/ice combination after the collison is shown below:
Here the law of conservation is applied
[tex]p_i = p_f\\\\m_av_a+m_b+v_b= (m_a + m_b)v[/tex]
Here
[tex]m_a = 2.0 kg\\\\v_a = 10m/s\\\\m_b = 10 kg\\\\v_b = 0[/tex]
Now
[tex]v = \frac{m_av_a+ m_bv_b}{m_a + m_b} \\\\= \frac{(2.0kg) (10 m/s) + 0}{2.0kg + 10.0kg}[/tex]
= 1.67 m/s
hence, the velocity is 1.67 m/s
What do u mean by 1 energy work?
Answers
Answer:
In physics we say that work is done on an object when you transfer energy to that object. If one object transfers (gives) energy to a second object, then the first object does work on the second object. Work is the application of a force over a distance. ... Energy can be defined as the capacity for doing work.
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Answers
Answer:
The Potential Energy of the Swing is Changing in to Kinetic Energy when is start moving.
Explanation:
When the Swing is pull at its extreme point then it has maximum potential energy. Because the formula of potential energy is:
P.E. = (1/2)k*x^2
Here x shows the body displacement from the mean (Equilibrium) position. Since at maximum position the displacement is maximum therefore the P.E. is maximum at the extreme point.
When the Swing is released and start moving from extreme position to mean its P.E. is changing into Kinetic Energy. Because with the movement towards the mean position body acquire more speed and that speed increases its velocity. Since Kinetic Energy is given as:
K.E. = (1/2) m*v^2
Therefore with the increase in velocity kinetic energy increases.
But when body again moving towards the extreme position, its kinetic energy again changes into P.E with the same reason as I discussed in the above paragraph.
Some of the energy is also changes in to heat in order to overcome air resistance.
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Which of the following is one way to decrease momentum?
A. increase impulse
B. increase force
C. increase velocity
D. increase friction
Answers
Answer:
Increase friction
Explanation:
The others would make the object move faster
If 15 C passes a point in a circuit in 5.0 s, the current in the circuit is:
Answers
Answer:
I = 3 Amp
Explanation:
Current in a Conductor
The electric current that moves through a conductor is defined as the charge Q that passes through it per unit time.
[tex]\displaystyle I=\frac{Q}{t}[/tex]
The SI unit for the current is the Ampere. One ampere is the current that flows when one coulomb of charge passes a point in a circuit in one second.
It's known that a charge of Q=15 C passes a point in a circuit in 5 seconds, thus the current is:
[tex]\displaystyle I=\frac{15\ C}{5\ s}[/tex]
I = 3 Amp
The current in the circuit is 3 A.
The current in the circuit can be calculated using the formula below.
Formula:
C = Q/t............... Equation 1Where:
C = Current in the circuitQ = Charge passing through the circuitt = time.From the question,
Given:
Q = 15 Ct = 5.0 sSubstitute these values into the equation.
C = 15/5C = 3 AHence, the current in the circuit is 3 A.
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A rat is pushed with a massive force. The mass of the rat is 2.3 kg and the acceleration of the rat is 9.5 m/s^2. What was the force applied to the rat?
21.85 N
4.1 m/s^2
0.24 N
22 N
Answers
Answer:
Force = 21.85N
Explanation:
Given the following data;
Mass = 2.3kg
Acceleration = 9.5m/s²
To find the force;
Force is given by the multiplication of mass and acceleration.
Mathematically, Force is;
[tex] F = ma[/tex]
Where;
F represents force.
m represents the mass of an object.
a represents acceleration.
Substituting into the equation, we have
Force = 2.3 * 9.5
Force = 21.85N
Therefore, the force applied to the rat is 21.85 Newton.
What term is used when heat is transferred from one piece of matter to another until they are of equal temperature? A. combustion B. phase change C. equilibrium
Answers
The term used when heat is transferred from one piece of matter to another until they are of equal temperature is equilibrium so, option C is correct.
What is heat?Heat is energy that is transmitted from one body to another when temperatures are different. When two bodies of different temperatures are brought together, energy is exchanged, or heat flows, from the hotter body to the colder.
An increase in the temperature of the colder body and a reduction in the temperature of the hotter body is typical, though not always, the results of this energy transfer.
The system (or collection of systems) is said to be in thermal equilibrium when these temperatures equalize and heat no longer flows through them. The absence of substance flowing into or out of the system is another implication of thermal equilibrium.
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Does heat cause kinetic energy to increase or decrease? Why?
Answers
Answer:
When the temperature of an object increases, the average kinetic energy of its particles increases. When the average kinetic energy of its particles increases, the object's thermal energy increases. Therefore, the thermal energy of an object increases as its temperature increases.
Explanation:
A roller coaster car picks up speed as it rolls down the slope. As it starts down the slope, its speed is 4m/s. It accelerates at a rate of 6 m/s/s. What is its velocity after 3 seconds?
Answers
Answer:
6 m/s^2
Explanation:
What happens when condensation causes clouds to become very heavy?
a
evaporation
b
condensation
c
precipitation
d
accumulation
Answers
Answer:
C. precipitation
Explanation:
if clouds store too much water from evaporation, it will rain which is precipitation
An incident on route 12 summary?I need to describe what happens in the book in a short summary can anyone help?
Answers
Answer: An Incident on Route 12 is presented here in a high quality paperback edition. This popular classic work by James H. Schmitz is in the English language, and may not include graphics or images from the original edition.
Explanation: I HOPE THAT HELPED
Particulate Motion Unit Test
1. There are two pieces of copper. Piece A is at 70 degrees, while piece B is at 150 degrees. Which piece has more thermal energy? (1 point)
Piece A, because its particles move slower
Piece B, because its particles move faster
Piece A, because its particles move faster
Piece B, because its particles move slower
2. The electrons in the copper atoms in a wire start to move when an electric potential difference is introduced. Which statement about this situation is true?(1 point)
The macroscopic movement of the electrons creates a microscopic flow of electricity.
The macroscopic movement of the electrons creates a macroscopic flow of electricity.
The microscopic movement of the electrons creates a macroscopic flow of electricity.
The microscopic movement of the electrons creates a microscopic flow of electricity.
3. Which statement describes the gravitational energy and energy stored in a magnetic field when objects are drawn close to each other?(1 point)
Both gravitational energy and energy stored in a magnetic field attract.
Both gravitational energy and energy stored in a magnetic field repel.
Gravitational energy attracts; energy stored in a magnetic field attracts or repels.
Gravitational energy attracts; energy stored in a magnetic field repels.
4. A scientist is heating a piece of metal and measuring its temperature. She observes that the temperature of the metal is rapidly increasing. Which statement is correct about the thermal energy of the metal? (1 point)
Thermal energy will increase for as long as temperature is increasing.
Thermal energy will increase for as long as the metal is in solid state.
Thermal energy will increase for as long as the metal is absorbing heat energy.
Thermal energy will increase for as long as the potential energy is zero.
5. A student places a piece of ice inside a glass beaker at room temperature and heats them until they both come to 70°C. Which statement is correct about the energies of the ice and beaker? (1 point)
The thermal energy of the beaker has increased more than the thermal energy of the ice.
The thermal energy of the ice has increased more than the thermal energy of the beaker.
The potential energy of both the ice and beaker have increased the same amount.
The kinetic energy of both the ice and beaker have increased the same amount.
6. Which energy types are both examples of energy on a macroscopic scale?(1 point)
chemical energy and gravitational potential energy
thermal energy and spring potential energy
gravitational potential energy and kinetic energy
kinetic energy and thermal energy
7. A high diver steps off the diving platform and begins falling toward the pool of water below. Which statement about this situation is correct?(1 point)
The amount of energy that is transferred to thermal energy due to friction will be greater at the the top of the fall than at the bottom of the fall.
The gravitational potential energy of the diver decreases as it changes to kinetic energy.
The kinetic energy of the diver decreases as the diver approaches the water.
The gravitational potential energy of the diver increases because of the change in thermal energy due to friction.
8. For a system that contains a rock falling through the air, which situation is always true?(1 point)
The total potential energy of the system is conserved.
The total kinetic energy of the system is conserved.
The total mechanical energy of the system is conserved.
The total energy of the system is conserved.
Answers
Answer:
1. piece b because it’s particles move faster.
2. the microscopic movement of the electrons creates a macroscopic flow of electricity.
3. gravitational energy attracts; energy stored in a magnetic field attracts or repels.
4. thermal energy will increase for as long as the metal is absorbing heat energy.
5. the thermal energy of the ice has increased more than the thermal energy of the beaker.
6. gravitational potential energy and kinetic energy
7. the gravitational potential energy of the river decreases as it changes to kinetic energy
8. the total energy of the system is conserved.
Explanation:
just took the test; these are all correct!
For a system that contains a rock falling through the air, the total mechanical energy of the system is conserved.
The piece that has a greater thermal energy is the piece that is at higher temperature because Piece B has particles that move faster. The statement that is true regarding electron movement in a copper wire is that; "the microscopic movement of the electrons creates a macroscopic flow of electricity."The energy stored in a magnetic field is related to the gravitational energy by the statement; "gravitational energy attracts; energy stored in a magnetic field attracts or repels."The statement that is correct about the metal whose temperature is increasing rapidly is; "thermal energy will increase for as long as temperature is increasing."The statement that is true about the ice inside a glass beaker is that; "the kinetic energy of both the ice and beaker have increased the same amount."The energy types that are both examples of energy on a macroscopic scale are chemical energy and gravitational potential energy.As the diver steps off the diving platform and begins falling toward the pool of water below, the gravitational potential energy of the diver decreases as it changes to kinetic energy.For a system that contains a rock falling through the air, the total mechanical energy of the system is conserved.Learn more about mechanical energy: https://brainly.com/question/15025401
When an object is dropped what happens to potential and kinetic energy as it falls
Answers
Answer:
potential energy decreases
kinetic energy increases
help me, please with this queastion
Answers
Answer:
Kinetic energy is the energy due to motion. Potential energy is energy stored in matter. The joule (J) is the SI unit of energy and equals (kg×m2s2) ( kg × m 2 s 2 ) .
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Science Why did trilobites go extinct and why are index fossil so important
Answers
Explanation:
Because they evolved rapidly, and moulted like other arthropods,trilobites serve as excellent index fossils, enabling geologists to date the age of the rock in which they are found
what is one weird thing that happens at absolute zero?
Answers
Answer:
Atoms cannot move.
Explanation:
