I believe that it is C.24 inches
Answer: A. 12inches
Explanation:
One of the characteristics of an object placed in front of a plane mirror is that the object distance(u) is equal to the image distance(v) no matter the position of the object from the mirror.
Since object distance is 30 inches, the image distance will be 30inches as will i.e u = v
Using the relationship to get the height of the image
v/u = h1/h0
Where h1 is image height and h0 is object height.
h0 = 12inches
Substituting the values given in the formula we have
30/30 = h1/12
h1 = 12inches.
This means that the image produce by the object is also 12inches tall.
What structure is used to focus light in a reflecting telescope?
Convex lens
Plane mirror
Concave mirror
Answer:
Concave mirror
Explanation:
Reflecting telescopes is a type of telescope that uses mirrors instead of lens. This is because mirrors are lighter and thus are easier to make perfectly smooth as compared to lenses.Reflecting telescopes use concave mirrors for the purposes of bringing light gathered to a certain focus. Concave mirror in reflecting telescopes collects parallel rays from the object and forms an image at the focal point.
Answer:
CONCAVE
Explanation:did it on edge 2021
If the action force of a bat striking a ball accelerates the ball in one direction, the
reaction force accelerates the bat in the ____________________ direction.
Answer:
Opposite
Explanation:
if you put 20 lbs of force into the swing then 20 lsb of force is put into the ball and the bat so think of it as two balls being thrown at each other at the same speed they will hit each other and stop because the force cancels out
i hope this helps and sorry if im wrong
If a bat hits a ball and sends it in one direction, the bat will be accelerated in the opposite direction. This is based on Newton's third law of motion which states that for every action, there is an equal and opposite reaction.
Explanation:The laws of physics state that for every action, there is an equal and opposite reaction. This is known as Newton's third law. If the action force of a bat striking a ball accelerates the ball in one direction, the reaction force accelerates the bat in the opposite direction. This means that if the bat propels the ball to the left, the bat would be driven to the right and vice versa. This is why a players' hand can feel a sting or shock when hitting a baseball, which is the bat being accelerated in the opposite direction by the reaction force.
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Consider the roller coaster on the track. If you want to increase the kinetic energy of the roller coaster as it proceeds through the course, what is the FIRST thing you should do?
A) Increase the height at point A.
B) Decrease the height at point A.
C) Increase the height at point B.
D) Decrease the height at point B.
Answer:
The answer is A and D but if you want one anwer i think the anwer is A
Explanation:
Increase the height at point A will increase the kinetic energy of the roller coaster. Option A is correct.
What is kinetic energy?The energy of the body by the virtue of its motion is known as the kinetic energy of the body. It is defined as the product of half of mass and square of the velocity.
According to the law of conservation of energy, the total energy is defined as the sum of kinetic energy and potential energy.
Total energy = kinetic energy+energy+potential energy
Also, the energy can not be created nor be destroyed can be transferred from one form to another form.
Work = Force × distance
Kinetic energy = work = weight × height traveled
Increase the height at point A will increase the kinetic energy of the roller coaster.
Hence, option A is correct.
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A child pushes a toy car down a hill. The child has a mass of 20 kg. The car has a mass of 1.6 kg and a speed of 7.4 m/s2. When the car has a gravitational potential energy of 30 J, what is the mechanical energy of the car?
Answer:
The answer is 73.8 J
Explanation:
When calculating the net electrostatic force, a negative value indicates that the two charged objects involved __________.
A. have like charges
B. have unlike charges
C. have the exact same value
D. both experience a force to the left
Answer:
B
Explanation:
The correct answer is B) have unlike charges. Since they are attracted to each other they have to be unlike
Final answer:
A negative value for net electrostatic force signifies that the two charged objects have unlike charges, which attract each other. So the correct option is B.
Explanation:
When calculating the net electrostatic force, a negative value indicates that the two charged objects involved have unlike charges. This is because Coulomb's Law states that the force exerted on one charged particle by another is directed away from the other particle if both have the same kind of charge, resulting in a positive value for the force, signifying repulsion. However, if the value of the force is negative, it implies attraction, as the force is directed toward the other particle; this occurs only when the charges are unlike (one positive and the other negative).
Using the reference information provided, it's clear that unlike charges exhibit an attractive force toward each other which would result in a negative value when calculated, as the direction of the force is opposite to that of repulsive force between like charges.
The presence of which element would indicate that a star is going through a high-mass star life cycle as opposed to a low-mass star life cycle? hydrogen carbon helium iron
Answer:
Iron
Explanation:
In a high mass star life cycle, there are 5 stages;
Stage 1: hydrogen nuclei combines to form helium
Stage 2: Helium combines to form carbon
Stage 3: carbon used to form heavy metals such as Iron
Stage 4: Supernova explosion
Stage 5: Core of the star collapses
In light mass star life cycle, the core of the star collapses after all the helium combines to form carbon.
Answer:
D. iron
Explanation:
Which part of the ear sends a message to the brain that is recognized as sound
Answer:
Inner Ear
Explanation:
Inner Ear or Cochlea
As radiation is passed through the electrical field (above), it is observed that this radiation does not change direction as it passes through. Predict other properties that this radiation would have. A) It would have no mass, high penetrating power and travels at the speed of light. B) It would have a very light mass, medium penetrating power and travels very fast. C) It would have the mass of a helium nucleus, low penetrating power and travels slow. D) It would have a very light mass, high penetrating power and travels at the speed of light.
Answer:
A) It would have no mass, high penetrating power and travels at the speed of light.
Explanation:
Gamma radiation would pass straight through an electrical field and not change direction because it has no charge. It would have no mass, high penetrating power and travel at the speed of light. These properties are all indicative of a gamma radiation.
Gamma rays, which do not change direction in an electric field, have no mass, high penetrating power, and travel at the speed of light; therefore, the correct answer is Option A.
When radiation is passed through an electric field and doesn't change direction, it indicates that the radiation lacks charge and therefore is unaffected by the electric field. Based on Figure 31.3 provided, the radiation described is most likely gamma rays, which are a form of electromagnetic radiation and have no mass or charge. Given the options provided, the correct prediction for the properties of this radiation would be Option A: It would have no mass, high penetrating power, and travels at the speed of light. Radiation shielding often involves materials such as lead to protect against gamma rays due to their high penetrating power as they can pass through dense materials and even the human body without being absorbed, as described in Table 17.3.1.
Find the equivalent resistance and the current in each resistor
Answer:
Equivalence resistance: 3 Ω.
Current:
12.0 A in the 1.00 Ω and the 3.00 Ω resistor;4.00 A in the 7.00 Ω and the 5.00 Ω resistor.Explanation:
Equivalent ResistanceThe 1.00 Ω resistor and the 3.00 resistor are in series. Add their resistance up to find the equivalent resistance of the upper branch:
[tex]1.00\;\Omega + 3.00 \;\Omega = 4.00\;\Omega[/tex].
Try the same steps for the lower branch. The equivalent resistance of the 7.00 Ω resistor and the 5.00 Ω resistor in series is 12.00 Ω.
The upper and lower branch are in parallel. Take the reciprocal of the resistance of each branch. Add the two reciprocals to each other. The equivalent resistance of the two branches will be the reciprocal of the sum. In other words, the equivalent resistance of resistors [tex]R_1[/tex] and [tex]R_2[/tex] in parallel will be:
[tex]\dfrac{1}{\dfrac{1}{R_1}+\dfrac{1}{R_2}}[/tex].
For the upper and lower branches in this question, the equivalent resistance will be
[tex]\dfrac{1}{\dfrac{1}{4.00}+\dfrac{1}{12.00}} = 3.00\;\Omega[/tex].
Current in each ResistorThe internal resistance of the power supply is 0. As a result, the voltage across the two parallel branches is 48.0 V, the same as the EMF. Since the two branches are connected in parallel, the voltage across both branch will be 48.0 V.
The two resistors in each branch are in series. The current that flows into each branch is the same as the charge that flows out. As a result, the current through the each resistor in a branch will be the same as the current through the entire branch. In other words,
Current in the 1.00 Ω Resistor
= Current in the 3.00 Ω Resistor
= Current in the upper branch
= [tex]\displaystyle \frac{V}{R} = \frac{48.0}{4.00} = 12.0\;\text{A}[/tex].
Try these steps to find the current in the two resistors in the lower branch:
[tex]\displaystyle I_\text{lower}=\frac{V}{R} = \frac{48.0}{12.00} = 4.00\;\text{A}[/tex].
How much heat is absorbed by a 47g iron skillet when its temperature rises from 12oC to 20oC?
Answer
169.2 J
Explanation
Given in the question,
mass of iron = 47g
specific heat capacity of iron = 0.450 (J/g 0C)
initial temperature = 12° C
final temperature = 20° C
The energy q needed to increase an object of mass m and specific heat capacity c by a temperature θ is given by:
q = mcΔt
q = 47(0.45)(20-12)
q = 169.2 J
Which part of the electromagnetic spectrum is nearest to X-rays?
Answer: Gamma Rays
If we divide the electromagnetic spectrum in its different wavelengths in an increasing way, the order is:
Cosmic Rays<Gamma Rays<X Rays< Ultraviolet<Visible Spectrum< Infrared<Microwaves ... and so on
So, if we go from short wavelengths to long wavelengths, those closest to X-rays are gamma rays.
But if we go from long wavelengths to short wavelengths, the closest to X-rays are ultraviolet.
It should be noted that X-rays are ionizing radiation, capable of altering the composition of atoms and body tissues cells. Therefore, it is dangerous and must be handled with care and under strict radiological safety regulations.
♥answer♥
Gamma rays!
♥ お力になれて、嬉しいです！♥A positron undergoes a displacement ∆r= 2i -3j+6k, ending with the position vector r= 3j-4k, in meters. what was the positron's initial position
[tex]
\Delta{r}=2i-3j+6k \\
r_f = 3j-4k \\
\Delta{r}=r_f-r_0\Longrightarrow2i-3j+6k=3j-4k-r_0 \\
r_0=2i-3j+6k+3j-4k=\boxed{2i+6j+10k}
[/tex]
The initial position of the positron is determined by subtracting the displacement vector from the final position vector, yielding a result of 2i + 6j - 2k meters.
Explanation:The initial position of the position can be calculated using the given final position and displacement vectors. According to vector addition, the final position vector r is equal to the initial position vector plus the displacement vector ∆r
So, if we rearrange we have, Initial position vector = Final position vector - Displacement vector. Therefore, the initial position vector will be r - ∆r = (3j - 4k) - (2i - 3j + 6k).
So, solving this equation, the initial position of the positron turns out to be 2i + 6j - 2k meters.
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What did Thomson’s model of the atom include that Dalton’s model did not have?
a nucleus
energy levels
electron clouds
smaller particles
Answer: Option (d) is the correct answer.
Explanation:
Dalton's model of atom states that every matter is made up of atoms and these atoms are indivisible in nature.
On the other hand, Thomson's model of atom states that there are small particles present in an atom that has positive or negative charges.
Thomson's model of atom is also known as plum pudding model where negatively charged particles are represented by plum and positively charged particles are represented by pudding.
Thus, we can conclude that Thomson’s model of the atom include smaller particles that Dalton’s model did not have.
Answer:
smaller particles....(D)
Explanation:
hope this helps
Drug abuse is best defined as __________.
A.
the consumption of legal drugs
B.
the consumption of illegal drugs
C.
the nonmedical or improper use of a drug that can interfere with a healthy life
D.
using drugs on an occasional basis until mood is altered
THE ANSWER IS C
Answer:
Drug abuse is best defined as the nonmedical or improper use of a drug that can interfere with a healthy life.
For example, a person that is addicted to cocaine will use it everyday, and will develope agressive behavior, anxiety, sleep disorder, paranoia etc.
This person could get addicted at the point of comiting a robbery, killing and much more.
Drug abuse is best defined as the nonmedical or improper use of a drug that can interfere with a healthy life.
Hence, the correct option is C.
Drug abuse is best defined as the nonmedical or improper use of a drug that can interfere with a person's physical, psychological, and social well-being.
It involves using drugs for purposes other than their intended medical use or using drugs in excessive amounts or frequency, which can lead to addiction, health problems, and negative consequences in various aspects of life.
Drug abuse can involve both legal and illegal drugs and is a significant public health concern worldwide.
Therefore, Drug abuse is best defined as the nonmedical or improper use of a drug that can interfere with a healthy life.
Hence, the correct option is C.
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A book is at rest on a table. According to Newton's first law of motion, which explanation best describes the reason why the book is not moving? A) Gravity is pulling the book against the table. B) No net force is acting C) No forces are acting on the book.
Answer:
I belive it is c
Explanation: If an object is at rest it shall stay at rest until an equal or oppisite force is applied.
Final answer:
The book at rest on a table is not moving due to no net force acting on it, as per Newton's first law of motion. The downward force of gravity and the upward normal force from the table are equal and opposite, canceling each other out.
Explanation:
A book at rest on a table is not moving because, according to Newton's first law of motion, there is no net force acting on the book. This law, also known as the law of inertia, implies that an object will remain at rest or continue to move at a constant velocity unless acted upon by a net external force. In the case of the book on the table, two forces are acting upon it; gravity is pulling the book downward while the table provides an upward normal force that exactly balances out gravity, resulting in no net force on the book.
The Newton's-third-law partner of the earth's gravitational force on the book is the book's gravitational force pulling upward on the planet Earth. Although this force exists, its effect on the massive Earth is negligible compared to the effect of the Earth's gravity on the book.
An object in equilibrium has a net force of
. Static equilibrium describes an object at
having equal and balanced forces acting upon it. Dynamic equilibrium describes an object in
having equal and balanced forces acting upon it.
Answer:
An object in equilibrium has a net force of zero
Static equilibrium describes an object at rest having equal and balanced forces acting upon it.
Dynamic equilibrium describes an object in motion having equal and balanced forces acting upon it.
Explanation:
An object is said to be in equilibrium when a net force of zero is acting on it. When this condition occurs, the object will have zero acceleration, according to Newton's second law:
[tex]F=ma[/tex]
where F is the net force, m the mass of the object, a the acceleration. Since F=0, then a=0. As a result, we have two possible situations:
- If the object was at rest, then it will keep its state of rest. In this case, we talk about static equilibrium.
- If the object was moving, it will keep moving with constant velocity. In this case, we talk about dynamic equilibrium.
An object in equilibrium has a net force of zero. In static equilibrium, the object is at rest, and the forces acting on it are balanced, resulting in no net force.
Dynamic equilibrium describes an object in motion with a constant velocity. In this state, the object is moving at a constant speed in a straight line, and the forces acting on it are balanced. Similar to static equilibrium, the net force acting on the object is zero.
Both static equilibrium and dynamic equilibrium require the forces acting on the object to be balanced, resulting in a net force of zero. The difference lies in whether the object is at rest or moving at a constant velocity.
Therefore, A subject in equilibrium experiences no net force.
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When a star dies, which of these celestial objects is it most likely to help create? A. a planet B. a star C. a moon D. a meteor E. a comet
Answer:
B
Explanation:
When a star dies, it is most likely to help create a star, therefore the correct answer is option B
What is Chandrasekhar's limit?
Chandrasekhar's limit is a type of maximum limited value that is used to define the maximum mass of a white dwarf star. The generally internationally considered value of the Chandrasekhar limit is about 1.44 times the mass of the sun which is approximately 2.765×10³⁰ kg.
In other words, one can say that the Chandrasekhar limit is the maximum value that can attain 1.44 times the solar mass.
A high-mass star expands and transforms into a red supergiant when it runs out of gas to burn. The supergiant stars, known as supernovae, obliterate themselves in a tremendous explosion while the majority of stars slowly fade away. Massive star deaths can result in the formation of new stars.
Thus, The correct response is option B because when a star dies, it most likely contributes to the creation of another star.
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What does stat mean
Answer:immediately
Explanation:
I think its like four words put together
What is true about resistance? Check all that apply. A. It is the excess accumulation of electric charge B. It is measured in ohms. C. It is the opposition of movement of electric charge. D. It is measured in amps. E. It is related to voltage and current by Ohm's Law.
Answer:
B, C and E
Explanation:
The unit of resistance in the international system is the Ohm, the equation that describes the resistance is:
[tex]R=p\frac{l}{S} \\[/tex]
Where (l) is for lenght of the wire, (S) is the area and (p) its the constant associated to the conductor.
It's related by the Ohm's Law:
[tex]R=\frac{V}{I}[/tex]
Resistance, measured in ohms, refers to the opposition of the flow of electric charge in a conductor. It is not the excess accumulation of electric charge, nor is it measured in amps. Resistance is related to voltage and current as per Ohm's Law.
Explanation:Resistance, in the context of Physics, is the opposition to the flow of electric charge through a conductor. It can be thought of as electrical friction that resists the flow of charge, akin to how physical obstructions can slow down the flow of water. Resistance is typically measured in units called ohms and is symbolized by the Greek letter Omega (Ω). It's not the excess accumulation of electric charge, as stated in option A.
Ohm's Law, named after the German physicist Georg Simon Ohm, relates resistance to voltage and current. It states that the current passing through a conductor between two points is directly proportional to the voltage across the two points when the temperature remains constant. Mathematically, it is expressed as V = IR, where V is the voltage in volts, I is the current in amps, and R is the resistance in ohms.
Therefore, the statements B, C, and E are true about resistance. It is not measured in amps (option D); current is measured in amps. The resistance of a component can be determined using an ohmmeter, and the equivalent resistance of a circuit depends on how resistors are connected within the circuit (in series, parallel, or a combination of both).
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A student places a magnet into a box of paper clips. When she lifts the magnet, some of the paper clips are pulled out of the box. However, some of the clips remain in the box. Why can’t the student pull all of the paper clips out of the box?
Answer:
The magnetic force of the magnet can only be used so much
If the magnet is covered with paper clips it can not pick up more
Explanation:
Final answer:
The student cannot lift all paper clips because the magnet's force has limited range and intervening materials can reduce its effectiveness. Some paper clips may also stick together after being magnetized, exceeding the magnet's lifting capacity.
Explanation:
The student cannot pull all the paper clips out of the box because the magnetic force of the magnet has a limited range, and not all paper clips are within that range. Additionally, if other materials are placed between the magnet and the paper clips, like paper or wood, they may reduce the magnetic attraction. Moreover, the magnetization of the paper clips through contact with a magnet can cause some of them to stick together, thereby increasing the effective weight beyond the lifting capacity of the magnet used by the student.
Experiencing magnetic forces like attraction or repulsion among paper clips demonstrates the behavior of bar magnets which, based on their ends being north or south poles, can either attract or repel each other. This principle is also evident in other experiments where materials are used to see how they influence magnetic forces, such as using a metal ruler to attract paper clips after rubbing it with a magnet, indicating induced magnetization.
is hydrogen a gas or metal? or both?
Hydrogen is a nonmetal.
At normal room temperature, hydrogen is a gas.
Hope this helps have a noice day
MAY GOD BLESS YOU!!!
Answer:
[tex]\large \boxed{\mathrm{gas}}[/tex]
Explanation:
Hydrogen is a gas at room temperature. Hydrogen has a molecular formula of [tex]\sf H_2[/tex].
5. Which type of energy resource is hamessed beneath the Earth's surface? A. biomass B.solar C.hydroelectric D.geothermal
It's called geothermal energy, and is present due to the incredible amount of heat present in Earth's interior from radioactive decay, friction, and residual heat from Earth's formation.
tyhe mass of an object is 117 g adding 1200j of heat will raise the temperture of the object by 12 celsius what is the specifc heat of the object A 0.35 j/g *k B 6.8 j/g *k C 0.85 j/g*k D 42 j/g*k
Answer:
C 0.85 j/g*k
Explanation:
The specific heat capacity of a material is given by:
[tex]C_s = \frac{Q}{m \Delta T}[/tex]
where
Q is the amount of heat supplied to the object
m is the mass of the object
[tex]\Delta T[/tex] is the increase in temperature of the object
For the object in this problem, we have
m = 117 g is the mass
Q = 1200 J is the heat supplied
[tex]\Delta T=12^{\circ}[/tex] is the increase in temperature
Substituting into the formula, we find the specific heat:
[tex]C_s = \frac{1200 J}{(117 g)(12^{\circ})}=0.85 J/gC[/tex]
True or false a magnet is never found in nature
Answer:
False.
Explanation:
Isolated magnetic poles or magnetic monopoles cannot be found in nature.
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Both images were taken by a space telescope orbiting Earth. What do these images indicate?
A.
Ultraviolet light is more important than visible light in providing all information about the universe.
B.
Visible light is more important than ultraviolet light when attempting to detect changes in hotter stars.
C.
Different kinds of electromagnetic radiation can be used to detect various types of stars.
D.
Different kinds of electromagnetic radiation reach different parts of the Earth.
These images indicate that different kinds of electromagnetic radiation can be used to detect various types of stars. (C)
Choices 'A' and 'B' are absurd. "Important" is a wishy-washy, rubber word. It means different things to different people, and it can even mean different things to the same astronomer at different times, depending on what he's trying to see at that moment.
what is shown in the diagram?
A: a generator
B: an electromagnet
C: A turbine
D: A motor
B i think because it makes more sense and theirs magnets i made a mistake
Answer:
Its B, and Electro Magnet
Explanation:
You can tell because there is the N and S symbols, meaning north and south on a magnet.
Speed that does not change is referred to as ____________________ speed.
Answer:
Constant speed.
Explanation:
Because when the speed of an object remains the same - it does not increase or decrease - we say it is moving at a constant speed.
Hope I helped :)
Final answer:
Speed that does not change is referred to as constant speed or uniform speed. It is a scalar quantity, indicating magnitude only, and uniform motion involves maintaining the same velocity, including both speed and direction.
Explanation:
Speed that does not change is referred to as constant speed or uniform speed. When an object is moving at constant speed, it covers equal distances in equal intervals of time regardless of the direction of motion. Speed, being a scalar quantity, is only concerned with magnitude, not the direction of the travel.
Motion at a constant velocity, or uniform motion, means that the position of the object is changing at the same rate over time, and this typically indicates that there are no changes in speed and direction – the velocity is consistent. However, when referring specifically to speed without direction, constant or uniform speed can occur even if the direction changes.
in the periodic table notation below what information does the number 40.08 tell you
Answer:
The number above the symbol is the atomic mass (or atomic weight). This is the total number of protons and neutrons in an atom. The number below the symbol is the atomic number and this reflects the number of protons in the nucleus of each element's atom. Every element has a unique atomic number.
Explanation:
Cooper metal has a specific heat of 390 j/kg C. Calculate the amount of heat required to raise the temperature of 22.8 g of copper to 875 C
Answer:
= 7,600 Joules
Explanation:
Heat required to raise the temperature of a material is given by the formula;
Heat = mass × specific heat capacity × change in temperature.
In this case;
mass =22.8 g or 0.0228 kg
specific heat capacity = 390 J/kg°C
Temperature change = 875°C - 20°C = 855 °C
Therefore;
Heat = 0.0228 kg × 390 ×855
= 7,602.66 Joules
= 7,600 Joules
light takes 8 minutes 30 seconds to travel from sun to the earth the velocity of light with 3 million kilometres square. find the distance of Sun from the Earth
Answer:
1.53 billion kilometers
Explanation:
t = 8 min 30 s = 8×60 + 30 s = 510 s
v = 3×10⁶ km/s
d = vt
d = (3×10⁶ km/s) (510 s)
d = 1.53×10⁹ km
The distance between the surface of the sun and the surface of the earth is 1.53 billion kilometers.