Answer:
Image distance, v = 22.5 cm
Height of the image, h' = 6.5 cm
Explanation:
It is given that,
Height of the object, h = 5 cm
Object distance, u = -18 cm
Focal length of the lens, f = +10 cm
Using mirror's formula :
[tex]\dfrac{1}{f}=\dfrac{1}{v}-\dfrac{1}{u}[/tex]
[tex]\dfrac{1}{v}=\dfrac{1}{f}+\dfrac{1}{u}[/tex]
[tex]\dfrac{1}{v}=\dfrac{1}{10}+\dfrac{1}{(-18)}[/tex]
v = 22.5 cm
Magnification of the lens :
[tex]m=\dfrac{v}{u}=\dfrac{h'}{h}[/tex]
[tex]h'=\dfrac{v}{u}h[/tex]
[tex]h'=\dfrac{22.5\ cm}{-18\ cm}\times 5[/tex]
h' = -6.5 cm
Hence, this is the required solution.
Answer:
22.5 and 6.25
Explanation:
The electric field between two parallel plates has a magnitude of 875 n/
c. the positive plate is 0.002 m away from the negative plate.
which of the folowing is true at the point where you reach the top of your jump on ur trampoline?
a)The mechanical enerygy is zero
b)The potential energy is at a maximum
c)The kinetic enrgy and potential energy
d)The potential energy is zero
Answer:
b) The potential energy is at a maximum.
Explanation:
It happens because the equation for the potencial energy is a function of the height of the body (Epotential=mgh) and, when you reach the top of your jump, you obviously reach your maximum height.
Final answer:
The potential energy is at its maximum at the top of the jump on a trampoline, with kinetic energy being zero and mechanical energy equating to the potential energy. The correct option is b) The potential energy is at a maximum
Explanation:
The correct answer to the question is that at the top of your jump on a trampoline, the potential energy is at its maximum (b). This is because when you are at the peak of your jump, you have the maximum height above the ground, where the gravitational potential energy is highest when assuming gravitational force is the only significant force in play (air resistance being negligible).
Kinetic energy is zero at this point because you are momentarily stationary at the top of the jump before descending back down. The mechanical energy of the system is not zero, however, as it is the sum of kinetic and potential energy and therefore will equal the potential energy at the top of the jump.
How do odd-shaped ceilings, decorative panels, draperies, and glass windows affect echo and noise?
Odd-shaped ceilings, decorative panels, draperies, and glass windows reduce echoes and noises.
What is an echo?An echo is a sound that is caused because of the reflection of sound.
How can echoes be avoided?In order to avoid echoes, we must avoid creating surfaces where the sound waves can be focused.
Now, as we know the reason why echoes are formed and how can they be avoided, therefore,
Making odd-shaped ceilings and decorative panels reduces the surfaces where the sound waves can be focused. While putting draperies and glass windows will absorb the sounds, As glass absorbs the sound waves and convert the energy into vibration energy.
Hence, odd-shaped ceilings, decorative panels, draperies, and glass windows reduce echoes and noises.
Learn more about Echo:
https://brainly.com/question/9028662
What occurs with the doppler effect are changes in _____. view available hint(s) what occurs with the doppler effect are changes in _______. frequency due to motion the speed of sound due to motion both of these answers are correct. neither of these answers is correct?
Final answer:
The Doppler effect involves changes in frequency due to the relative motion between a wave source and its observer, not changes in the speed of sound.
Explanation:
What occurs with the Doppler effect are changes in frequency due to motion. The Doppler effect is a phenomenon observed with waves, where there is an alteration in the observed frequency of a sound or light due to the relative motion between the source and the observer. It's important to note that the Doppler effect does not involve a change in the speed of sound due to motion, but strictly involves changes in frequency.
The practical applications of the Doppler effect are vast, ranging from medical diagnostics using Doppler-shifted ultrasound to determine blood flow, to astronomy where it helps in the study of the motion of stars and galaxies. Fundamentally, the effect explains how the motion affects the perceived pitch of a sound for an observer; for example, the high pitch of an approaching ambulance siren that lowers as it moves away.
Which is the best definition of a solution? A. A solution is any two liquids mixed. B. A solution is two gases mixed together. C. A solution is the same as a mixture. D. A solution is a mixture that has the same composition throughout.
Which characteristic accounts for the fact that red lights are used in dark rooms and DO NOT expose negatives during developing? A) small size B) low energy C) high energy D) high velocity
Answer:
A) Low Energy
Explanation:
Red colour light is light with larger wavelength due to which it can travel large distance. Due to this property of red colour light we use this colour to show different signals so that they are visible from distance
Here we also know by the formula of energy
[tex]E = \frac{hc}{\lambda}[/tex]
here we can see that the wavelength of light and energy of light is inversely depends on each other
So here we can say that red colour light is of larger wavelength and smaller energy due to which it can travel larger distance
so correct answer is
A) Low Energy
Wave A has a longer wavelength than wave B, but their amplitudes are the same. Which carries more energy?
what is the amount of a certain isotope that occurs in a natural sample of an element
Answer:Relative abundance.
Explanation:
Relative abundance is the percentage of a particular isotope that occur in nature.
What is the power of a hair dryer if it uses 72,000 joules energy in 60.0 seconds
How much heat is givne out when 6.0g of water freezes at 0 degrees celcius the heat of fusion of water is 80.0 cal/g?
Which are examples of resonance? Check all that apply.
the volume on a stereo being turned up
a note being played on a saxophone
an opera singer breaking
a glass with her voice a person pushing
a swing at the rate it naturally oscillates back and forth
an echo
Answer: The correct options are:
A note being played on a saxophone
An opera singer breaking glass with her voice a person pushing
A swing at the rate it naturally oscillates back and forth
Explanation:
Resonance is a phenomenon which occurs when the applied frequency on the object is equal to its natural frequency.
When resonance occurs the amplitude of the vibrating object becomes large.
In the given options, the examples of the resonance are as follows:
"an opera singer breaking a glass with her voice a person pushing": Here, the resonance will occur due to which the glass will break. The applied frequency of the voice of a person on the glass matches with the natural frequency of the glass.
"a note being played on a saxophone": Here, the resonance will occur. The sound energy is produced by saxophone. The air is blown through mouthpiece in it. It causes reed to vibrate rapidly against mouthpiece. Then, air moves through it. Then, the sound is amplified until it escapes through open tone holes.
"swing at the rate it naturally oscillates back and forth": when the applied frequency on the swing matches with the natural frequency of swing. The amplitude of the swing will increase. Here, the resonance will occur.
Answer:
B. a note being played on a saxophone
C. an opera singer breaking a glass with her voice
D. a person pushing a swing at the rate it naturally oscillates back and forth
Edge.2023
Explanation:
<3
A crane is used to swing a 450 kg wrecking ball into a 500 kg wall. The crane takes 5 s to push the ball into the building. The crane provides 2000 N of force. The ball is left moving 10 m/s after the collision. How fast is the wall moving afterwards? *
How does the kinetic energy change in the crane problem?
1. KE increases
2. KE decreases
3. KE stays the same
What type of collision is this?
elasti
inelastic
Earth is the third planet from the Sun. This placement most affects Earth's unique ____ and ____ conditions.
1. a. temperature
b. differentiation
c. gravity
d. moon
2. a. lithospheric
b. mantle
c. core
d. atmospheric
which option is an example of a physical property?
A. boiling point
B. pH
C. toxicity
D. rusting ability
The correct answer would be A. boiling point. And the reason to that is because pH, toxicity, and rusting ability are all examples of chemical properties.
Answer:
boiling point
Explanation:
Physical property doesn't change the composition of the substance. Boiling point only change the matter, not the composition.
I took the test before. I got all the answer correct and got 100% score.
You can see my other article just search in search engine with: Learningandassignments diy4pro
Click on my site and find these related article post:
Learning Properties of Matter Quiz Unit 2 Lesson 11 Grade 8
Hope it helps.
#diy4pro
If an antenna is much longer than the wavelength, what is the typical result?
A hammer taps on the end of a 4.9 m long metal bar at room temperature. a microphone at the other end of the bar picks up two pulses of sound, one that travels through the metal and one that travels through the air. the pulses are separated in time by 10.4 ms. what is the speed of sound in this metal
NEED SCIENCE HELP:
Question 1:
which subatomic particle has a negative charge?
all of them
neutron
electron
proton
Question 2:
if an atom has 2 protons, 3 neutrons, and 3 electrons, what is the electrical charge of the atom?
positive
negative
neutral
varies
Question 3:
A neutral atom that gains electrons will have what kind of charge?
positive
negative
neutral
varies
Question 4:
which of the following describes the principle of the conservation of charge?
a charge is created
a charge cannot be transferred
charge cannot be created or destroyed, just transferred
charge can be destroyed
Question 5:
what law states that when there is an interaction between charged objects there is a non-contact force which acts over some distance of seperation?
faraday's law
ohm's law
coulomb's law
interaction law
Question 6:
which of the following describes an insulator?
does not allow electrons to move through it
allows electrons to move through it
is always a solid
is always a gas
Question 7:
what are most conductors made of?
wood
paper
plastic
metal
Question 8:
which of the following describes why lightening rods are put on top of houses?
insulate the house
conduct the lightening away from the house
reduce amount of static discharge
reduce the loudness of thunder
Question 9:
your computer is powered by which of the following?
electrical current
moving protons
overflow of electrons
static electricity
Question 10:
wire is used to attach a battery to a penny and is then used to light a small light bulb. the light bulb is lit due to which of the following?
static electricity
electric current
electron overflow
moving protons
Question 1:
which subatomic particle has a negative charge?
Answer:
Electron
Explanation:
There are three subatomic particles
electron, neutron and proton
out of all electron is negatively charged, proton is positively charged while neutron is a neutral particle
Question 2:
if an atom has 2 protons, 3 neutrons, and 3 electrons, what is the electrical charge of the atom?
Answer:
Negative
Explanation:
As we know that
[tex]Q = (N_p - N_e) e[/tex]
[tex]N_p = 2[/tex]
[tex]N_e = 3[/tex]
[tex]Q = (2- 3)e = -e[/tex]
so it is negatively charged
Question 3:
A neutral atom that gains electrons will have what kind of charge?
Answer:
Negative
Explanation:
Since electron is a negatively charged particle so on gaining an electron it will get negative charge
Question 4:
which of the following describes the principle of the conservation of charge?
Answer:
Charge cannot be created or destroyed, just transferred
Explanation:
charge can transfer from one atom to other atom but we can not create a charge or we can not destroy a charge
Question 5:
what law states that when there is an interaction between charged objects there is a non-contact force which acts over some distance of seperation?
Answer:
Coulomb's law
Explanation:
Coulombs law gives the force of attraction or repulsion between two charges which is given as
[tex]F = \frac{kq_1q_2}{r^2}[/tex]
Question 6:
which of the following describes an insulator?
Answer:
Does not allow electrons to move through it
Explanation:
in insulators all the charges are bounded and not free to move
Question 7:
what are most conductors made of?
Answer:
Metal
Explanation:
All conductors are source of free electrons in which they can move freely
Question 8:
which of the following describes why lightening rods are put on top of houses?
Answer:
conduct the lightening away from the house
Explanation:
lightening rod gives the path to excess charge to flow towards ground
Question 9:
your computer is powered by which of the following?
Answer:
Electrical current
Explanation:
All electrical device is powered by current source
Question 10:
wire is used to attach a battery to a penny and is then used to light a small light bulb. the light bulb is lit due to which of the following?
Answer:
electric current
Explanation:
electric current gives energy to glow the bulb
A kangaroo jumps to a vertical height of 251 cm. how long (in seconds) was the kangaroo in the air?
a small dog is trained to jump straight up a distance of 1.2m. How much kinetic energy does the 7.2kg dog need to jump this high? ( the acceleration due to gravity is 9.8m/s2)
Ryan is experimenting with core materials for an electromagnet. He slides different core materials through a coil of current-carrying wire. Sort the core materials based on whether they will or won’t increase the strength of Ryan’s electromagnet.
Which compound is held together by the electrostatic force between two ions?
A. CF4
B. NH3
C. CaBr2
D. CO2
Answer: Option (C) is the correct answer.
Explanation:
A compound that is formed by transfer of electrons results in the formation of an ionic bond and it is known as an ionic compound.
For example, calcium has 2 valence electrons and bromine has 7 valence electrons. So, in order to complete their octet calcium donates its two valence electrons to two bromine atoms.
Therefore, it results in the formation of an ionic compound [tex]CaBr_{2}[/tex].
In an ionic compound there is partial positive charge on the cation and partial negative charge on the anion.
Whereas a compound formed by sharing of electrons is known as a covalent compound.
For example, [tex]CF_{4}[/tex], [tex]NH_{3}[/tex] and [tex]CO_{2}[/tex] are all covalent compounds.
Thus, we can conclude that [tex]CaBr_{2}[/tex] is the compound that is held together by the electrostatic force between two ions.
Why does a curve on a distance-time graph indicate acceleration
... Speeding up or slowing down are two of the three forms of acceleration.
... The SLOPE of the line on a distance/time graph is the object's speed.
... If the graph is curved, then its slope is changing.
That means the object's speed is changing.
That means the object is accelerating.
Final answer:
A curve on a distance-time graph indicates acceleration because the slope of the graph reflects velocity, which changes when acceleration is present. A straight line represents constant velocity with no acceleration, while a changing slope means varying velocity, indicating acceleration.
Explanation:
On a distance-time graph, a curve indicates acceleration because the slope of the graph represents velocity, which is distance divided by time. When velocity changes, it means there is an acceleration present. If the graph is a straight line, the slope is constant, and the velocity is uniform, hence, no acceleration. When the slope (or the 'steepness' of the curve) changes, it indicates a changing velocity. A steeper slope means an increase in velocity, indicative of positive acceleration, while a slope that becomes less steep suggests a slowing down, or negative acceleration.
Accurate depiction of acceleration in physics requires consideration of the shape of the curve on a position vs. time graph. A parabolic curve suggests constant acceleration, while a hyperbola might represent acceleration defined in specific intervals. The 'cup' of the curve pointing up or down indicates the direction of acceleration. It's important to understand that while a velocity-time graph can show instantaneous acceleration as the slope of the tangent line, the position-time graph's relationship to acceleration is more indirect and is reflected in the curvature of the graph.
To remove a tight fitting lid from a jar, Megan runs the lid under hot water. What happenes to the jar lid when its temperature increases?
(a) The temperature increases, the lid expands
(b) The potential energy decreases, and the lid expands
(c) The potential energy increases, and the lid contracts
(d) The temperature decreases, and the lid contracts
Answer:
(a) The temperature increases, the lid expands
Explanation:
Running the lid under hot water will result in the transfer of heat from the water to the lid of the jar.
The heating up of the lid increases its temperature and the average kinetic energy of the molecules of the lid. Hence, the jar lid to expand and becomes easier to open.
The correct option is a.
Describe how water may be treated before people use it
"LOOKALIKES" You are given two identical-looking metal cylinders and a long rope. The cylinders have the same size and shape and they weigh the same. You are told that one of them is hollow, the other is solid. How would you determine which is which using only the rope and the two cylinders?
One can be able to determine the metal cylinders based on the time taken to unwrap them.
From the information given, there are two identical-looking metal cylinders and a long rope and the cylinders have the same size, shape, and weight.
One can be able to differentiate then by using only the rope and the two cylinders by wrapping the rope around the cylinder. The hollow cylinder will take longer to wrap when compared to the solid one.
Read related link on:
https://brainly.com/question/1865636o
HELP WILL MEDAL !!!!!!!!!!!!!!!!!!!
Suppose you are an astronomer, and a child asks you to explain how long it takes light to travel through space. In your own words, answer the child's question. Be sure to mention the speed that light travels in space, and provide a general idea of how long it takes the light from distant stars to reach Earth.
14.
In an experiment, the independent variable _____.
affects the dependent variable
is a special type of control
should never be changed
changes in response to the dependent variable
Answer:
Affects the dependent variable.
Explanation:
A dependent variable is defined as the variable which is being tested during an experiment.
The dependent variable is the variable which is always dependent on the independent variable.
As in the experiments if the the value of independent variable then this change in independent variable will change the value of dependent variable.
For example: A scientist is recording the effect of light and dark on the moth by turning it off and on. In this case, the amount of light is independent variable and the moth's reaction is dependent variable. It means a change in the independent variable directly affect the dependent variable
properties such as luster conductivity and flexibility are used to describe what type of elements
From just the atomic number, what else is known?
a) the chemical number
b) the number of neutrons
c) the atomic mass
d) the number of protons
Answer:the number of protons
A racing car is moving around the circular track of radius 300 meters shown above. at the instant when the car's velocity is directed due east, its acceleration is directed due south and has a magnitude of 3 meters per second squared. when viewed from above, the car is moving clockwise at 30 m/s clockwise at 10 m/s counterclockwise at 30 m/s counterclockwise at 10 m/s
Answer:
the car is moving clockwise at 30 m/s
Explanation:
For an object moving in circular motion:
- The velocity is always tangential to the circle
- The acceleration (centripetal acceleration) is towards the centre of the circle, so perpendicular to the velocity)
In this case, the velocity is directed due east, while the acceleration is directed due south: so the car is "curved towards south while moving", this means that the car is travelling clockwise.
Moreover, the centripetal acceleration is given by:
[tex]a=\frac{v^2}{r}[/tex]
where
a = 3 m/s^2 is the acceleration
v is the speed
r = 300 m is the radius of the track
Solving for v,
[tex]v=\sqrt{ar}=\sqrt{(3 m/s^2)(300 m)}=30 m/s[/tex]
So the answer is
the car is moving clockwise at 30 m/s
In a clockwise circular motion, when a car's velocity is east, its inward or centripetal acceleration is due south. Circular motion rules dictate this because acceleration is towards the centre. However, the car's speed can't be deduced from this data.
Explanation:The student's question pertains to the concept of circular motion dynamics, which is a topic in physics. The key is understanding that a car moving in circular motion always has an acceleration directed towards the center of the path, also known as centripetal acceleration. The direction of velocity, which is tangential to the path, continually changes due to this inward acceleration.
If we consider a car moving clockwise around a circular track when viewed from above - the east would be on its right and south would be below. In this scenario, when the car's velocity is directed due east, the centripetal acceleration (due to the car's need to change direction to stay on the circular path) will be facing due south.
Regarding the speed of the car, it can be moving either clockwise or counterclockwise at either 10 m/s or 30 m/s. However, this information cannot be determined from the acceleration data as there is no measure of the car's tangential acceleration, which is the acceleration that affects the car's speed.
Learn more about circular motion here:https://brainly.com/question/2285236
#SPJ3