We know that from the image of a ray diagram, it is clear that the real image is\(+di\)
What is a real image?A real image is an image formed by the actual convergence of light at a specific location, such as on a screen or a photographic film.
It is formed by the intersection of light that come from an object and pass through a lens or a mirror, creating a reversed and inverted image of the object.
A real image can be captured and projected onto a surface, and can be seen by the eye without any additional optical equipment.
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Raju completes one round of a circular track of diameter 200m in 30s. Calculate
a. The distance travelled by Raju
b. The magnitude of displacement travelled by Raju at the end of 30 s.
Explanation:
Given:
Diameter = 200 m
Radius, r = 200/2 = 100 m
Time taken, t = 30 seconds
Formula to be used:
Distance traveled, = circumference of circle = 2πr
Answer:
Putting all the values, we get
Distance traveled = 2πr
Distance traveled = 2 × 22/7 × 100 Distance traveled = 4400/7 Distance traveled = 628.57 mSo, the distance traveled by Raju is 628.57 m.
Now, magnitude of the displacement,
At the end of 30 seconds, Raju will come to starting position or initial position, so displacement is zero.
If a lightbulb uses 65 W of electricity, but only uses 45 W to become light energy and uses 20 W as heat energy, how efficient m is the light bulb?
Answer:
Explanation:
the 40-watt bulb is going to require less energy to power.
Now you will focus on a second hypothesis. This hypothesis can be very similar to the first, but this time you want to focus only on the second variable in question, speed. What could be a hypothesis that would illustrate the relationship between speed and kinetic energy? Use the format of "if…then…because…” when writing your hypothesis
Answer:
Sample Response: If the speed of an object increases, then its kinetic energy will increase proportionally because speed and kinetic energy have a linear relationship when graphed.
Explanation:
edge
How do our attitudes help us organize our reality?
Answer:
If we are upset, often our mind cannot think straight. we need to take deep breaths, and focus on reality. When we are upset we do things out of anger.
Explanation:
Hope this helps!
1.What is the mass of an object that weighs 98 N?
Answer:
10 kg
Explanation:
what is the center of a comet head called?
It's important to know that a comet has a tale, a nucleus, and a coma.
The nucleus refers to the center of the "head" of the comet.
Hence, the answer is Nucleus.
A ball is projected with an initial velocity 50m/s at an angle 30 degree from the top of a tower 55m high.calculate the total time the ball was on the air and the maximum horizontal distance
Time of flight = 1.6 s
Horizontal distance = 64 m
What is a projectile motion?Projectile motion is the form of motion experienced by an object or particle projected into a gravitational field, such as from the surface of the Earth, and moves along a curvilinear path only under the action of gravity.
For the given case,
h = vt + ¹/₂gt²
h = height of tower
v = initial velocity
t = time of flight
55 = 50sin30t + ¹/₂9.8t²
55 = 25t + 4.9t²
4.9t² + 25t - 55 = 0
t = 1.6 s
X = vₓt
X = horizontal distance
vₓ = horizontal velocity
t = time of flight
X = (50 x cos30) x 1.6
X = 64 m
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A piece of copper weighing 400g is heated to 100°c and quickly transferred to a copper calorimeter of mass 10g containing 100g of liquid of unknown specific heat capacity at 30°c. If the final temperature of the mixture is 50°c, calculate the specific heat capacity of the liquid. (S.H.C of copper is 390J/kg/k)
A piece of copper at 100°C is transferred to a copper calorimeter with a liquid at 30°C. The final temperature is 50°C. By applying the principle of conservation of energy, the specific heat capacity of the liquid is calculated to be approximately 2100 J/kg/°C.
To calculate the specific heat capacity of the liquid, we can apply the principle of conservation of energy. The heat lost by the copper piece will be equal to the heat gained by the liquid and calorimeter.
The heat lost by the copper piece can be calculated using the formula:
Heat lost = Mass of copper × Specific heat capacity of copper × Temperature change
Given:
Mass of copper = 400 g
Specific heat capacity of copper = 390 J/kg/°C (assuming it remains constant)
Temperature change of copper = 100°C - 50°C = 50°C
Heat lost = 400 g × 390 J/kg/°C × 50°C
Heat lost = 7,800,000 J
The heat gained by the liquid and calorimeter can be calculated using the formula:
Heat gained = (Mass of liquid + Mass of calorimeter) × Specific heat capacity of liquid × Temperature change
Given:
Mass of liquid = 100 g
Mass of calorimeter = 10 g
Temperature change of liquid = 50°C - 30°C = 20°C
Heat gained = (100 g + 10 g) × Specific heat capacity of liquid × 20°C
Now, by equating the heat lost and heat gained:
7,800,000 J = (110 g) × Specific heat capacity of liquid × 20°C
Specific heat capacity of liquid = 7,800,000 J / (110 g × 20°C)
Specific heat capacity of liquid ≈ 3545.45 J/kg/°C
Therefore, the specific heat capacity of the liquid is approximately 3545.45 J/kg/°C.
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Dillon wonders if he can block the radio waves released by the remote control used to operate his radio-controlled car. He covers the remote control in different materials and tries to use it to operate his car. He records his observations in the table below. Why does the remote control not work when covered with aluminum foil? A) because the aluminum foil blocks the batteries B) because the aluminum foil blocks the microwaves C) because the aluminum foil blocks the radio waves D) because the aluminum foil blocks the sound waves
The remote control operated on Dillon's radio controlled car does not work when covered in aluminum foil because the aluminum foil blocks the radio waves. (option C)
Radio-controlled cars operate using radio waves, which are a type of electromagnetic radiation. When the remote control is covered with aluminum foil, the foil acts as a barrier that blocks the radio waves from reaching the car. This is why the remote control does not work when covered with aluminum foil.
It is important to note that radio waves are not the same as microwaves or sound waves. Microwaves are a type of electromagnetic radiation that is used for cooking food in microwave ovens, while sound waves are mechanical waves that travel through the air and are used for hearing. Therefore, options B and D are incorrect. Additionally, the aluminum foil does not block the batteries in the remote control, so option A is also incorrect.
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A roller coaster is at a peak of 20m and has a mass of 900kg. What is the potential energy of the roller coaster?
O 100000 J
10000 J
O 9.8 J
O 176400 J
The potential energy of the roller coaster is 176,400 J (joules).
The potential energy of an object is given by the formula PE = mgh, where PE is the potential energy, m is the mass of the object, g is the acceleration due to gravity, and h is the height or vertical position of the object.
In this case, the roller coaster is at a peak of 20m and has a mass of 900kg. The acceleration due to gravity, g, is approximately 9.8 \(m/s^2\).
Using the formula, we can calculate the potential energy:
PE = mgh
= (900 kg)(9.8 \(m/s^2\))(20 m)
= 176,400 J
Therefore, the potential energy of the roller coaster is 176,400 J (joules).
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What is the thinnest soap film (excluding the case of zero thickness) that appears black when illuminated with light with a wavelength of 550 nm
Answer:
The expression for destructive interference in thin films allows to find the result for the smallest thickness of the films is:
t = 2.03 10⁻⁸ mm
Explanation:
Given parameters
Incident wavelength lamo = 535 nm
Refractive index of the film n = 1.32
To find
The minimum thickness for destructive interference
The interference phenomenon occurs when the path of two rays scattered by an obstacle have different optical paths. In the case of thin films we must take into account:
The reflected wave has a phase change of 180º when it goes from a medium with a lower refractive index to a medium with a higher index.
Inside the film medium the wavelength is modulated by the refractive index.
In the attachment we see an outline of these events and the expression for destructive interference remains.
2 n t = m λ₀
Where n is the refractive index, t the thickness of the film, λ₀ the wavelength in the vacuum and m an integer indicating the order of interference.
t =
The first destructive interference occurs for m = 1, let's calculate.
t =
t = 202.65 nm
Let's reduce this amount to millimeters.
t = 202.65 nm
t = 2,027 10⁻⁸ mm
In conclusion, using the expression for destructive interference in thin films we can find the result for the smallest thickness of the films is:
t = 2.03 10⁻⁸ mm
Which statement about electric charges is correct? (1 point)
*two objects with negative charges will attract each other
*an object with a negative charge and an object with a positive charge will attract each other
*an object with a positive charge and an object with a negative charge will repel each other
*two objects with positive charges will attract each other
Answer:The correct statement about electric charges is:
"An object with a negative charge and an object with a positive charge will attract each other."
Explanation:
*an object with a negative charge and an object with a positive charge will attract each other" this statement is true.
What is charge ?Electric charge is the physical property of matter that experiences force when it is placed in electric field. F = qE where q is amount of charge, E = electric field and F = is force experienced by the charge. there are two types of charges, positive charge and negative charge which are generally carried by proton and electron resp. like charges repel each other and unlike charges attract each other. the flow charges is called as current. Elementary charge is amount of charge a electron is having, whose value is 1.602 x 10⁻¹⁹ C.
Hence option B is correct.
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A student catches a can of soda dropped from some unknown height by Mr. Fineman. If
the can was dropped from rest, and it is traveling at 8.9 m/s before it arrives in the
student's hand...
Answer:
v² = u² + 2gh
8.9² = 0² + 2(9.8)h
h = 4.0 m
v = at
t = 8.9/9.8
t = 0.91 s
28). A block weighs 90N and 80N respectively in air and in water. What will be the weight of the block in a brine of density 1.2g/cm?
Answer:
Buoyant force = g M / V * V = g d V where d is the mass / volume (density)
Fw = g * Vw * dw buoyant force of water on block (10 N)
Fbr = g * Vw * dbr buoyant force of brine on block
Fbr / Fw = 1.2 buoyant force of brine is 1.2 times that of water
Buoyant force of brine = 10 * 1.2 N = 12 N
Thus, the block will weight 90 - 12 = 78 N submersed in brine
A wave has an amplitude of 0.0800 m
and is moving 7.33 m/s. One oscillator
in the wave takes 0.230 s to go from
one crest to the next crest. Find the
wavelength of the wave.
(Unit = m)
If a wave has an amplitude of 0.0800 m and is moving 7.33 m/s. The
wavelength of the wave is 1.69m.
What is the wavelength?The wavelength of a wave can be determined using the equation:
Wavelength = velocity / frequency
To determine the frequency we need to calculate the reciprocal of the time it takes for one complete oscillation.
frequency = 1 / time
frequency = 1 / 0.230
frequency ≈ 4.35 Hz
Substitute the values into the wavelength equation:
wavelength = velocity / frequency
wavelength = 7.33 / 4.35
wavelength ≈ 1.69m
Therefore the wavelength of the wave is approximately 1.69 meters.
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A motorcycle stoop is at a traffic light, when the light turns green, the motorcycle accelerates to a speed of 78 km/h over a distance of 50 m. What is the average acceleration of the motorcycle over this distance?
The average acceleration of the motorcycle over the given distance is approximately 9.39 m/s².
To calculate the average acceleration of the motorcycle, we can use the formula:
Average acceleration = (final velocity - initial velocity) / time
First, let's convert the final velocity from km/h to m/s since the distance is given in meters. We know that 1 km/h is equal to 0.2778 m/s.
Converting the final velocity:
Final velocity = 78 km/h * 0.2778 m/s = 21.67 m/s
Since the motorcycle starts from rest (initial velocity is zero), the formula becomes:
Average acceleration = (21.67 m/s - 0 m/s) / time
To find the time taken to reach this velocity, we need to use the formula for average speed:
Average speed = total distance/time
Rearranging the formula:
time = total distance / average speed
Plugging in the values:
time = 50 m / 21.67 m/s ≈ 2.31 seconds
Now we can calculate the average acceleration:
Average acceleration = (21.67 m/s - 0 m/s) / 2.31 s ≈ 9.39 m/s²
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The decibel rules of thumb can be combined. (a) If a sound has intensity xdB, how many dB does a sound 100 times more intense have? (b) If another sound has intensity ydB, how many dB does a sound 4 times less intense have? (c) Combine what you know about (a) and (b): If a sound has intensity zdB, how many dB does a sound 25 times more intense have?
1. Which of the following does not affect the resistance of a wire?
a) Length
b) Temperature
c) Usage time
d) Cross-sectional area
2. If a 12V battery is passing current through a resistor with a current of 2A, what is the value of the resistor?
a 24resistance
b) 14resistance
c) 10resistance
d) 6resistance
3. Describe the differences between series and parallel circuits.
4. A circuit contains resistors of 8resistance and 4resistance，what is combined resistance if the resistors are combined:
a) In series
b) In parallel
5. A 0.5A current is passing across three resistors of 8resistance, 4resistance and 12resistance that are linked in series.
What is the potential difference of the circuit?
6. Wire A has a resistance of 24resistance. If wire B is double the length and has a diameter four times as large as wire A, what is the resistance of wire B?
A force F is exerted on a 5 kg block to move it across a rough surface, as shown above. The magnitude of the force is initially 5 N, and the block moves at a constant velocity. While the block is moving, the force is instantaneously increased to 12 N. How much kinetic energy does the block now gain as it moves a distance of 2 m?
Explanation:
The work done by a constant force is given by the equation W = Fd, where W is the work done, F is the force, and d is the distance moved.
The initial force of 5 N does no work, because it is balanced by the friction force. So, the work done by the increased force of 12 N can be found as follows:
W = Fd = 12 N x 2 m = 24 J
The work done on an object is equal to the change in its kinetic energy, so the increase in the block's kinetic energy is 24 J.
A big pendulum goes back and forth
once every 18.9 s. What is the
length of the pendulum?
(Unit = m)
T = 2π√(L/g)
For earth , g ~ 10
18.9 = 2×3.14 √(L/g)
9 = L/g
L = 90 metres
Answer:
88m
Explanation:
T=2π*\(\sqrt{L/g}\)-->Τ/2π=\(\sqrt{L/g}\)-->18.9/2π=\(\sqrt{L/g}\)-->3=\(\sqrt{L/g}\)-->3^2=L/g-->9=L/9.8
so L=9*9.8-->L≈88m
Explain/Describe how atoms in domains determine whether a material is magnetic or not. (Please help this is due today)
Answer:
In a material, the magnetic behavior depends on the alignment of magnetic moments of the atoms. Magnetic moments are generated by the motion of the electrons in the atoms. When the magnetic moments of atoms in a material are aligned in a specific pattern, it creates a magnetic field which results in the material being magnetic.
In many materials, the magnetic behavior arises due to the alignment of magnetic domains, which are regions of atoms with magnetic moments aligned in the same direction. When many domains with aligned magnetic moments are present in a material, the material becomes magnetic.
The magnetic behavior of a material depends on the number of electrons and the arrangement of those electrons in the atoms. In particular, for an atom to have a magnetic moment, it must have unpaired electrons, meaning electrons that are not paired with another electron with the opposite spin. When these unpaired electrons in the atoms are aligned, they generate a magnetic moment. If all electrons are paired, there will not be a net magnetic moment, so the material will not be magnetic.
So, in summary, the magnetic behavior of a material is determined by the alignment of magnetic moments of atoms. When the magnetic moments of many atoms in a material align in the same direction, it creates a magnetic field, leading to a material being magnetic. This alignment is usually present in magnetic domains consisting of atoms with unpaired electrons.
In one experiment, you measured the potential difference across a resistor as a capacitor discharged through it. You then plotted the natural logarithm of the voltage vs time (in seconds), and from the equation of the best fit line you measured the time constant of the RC circuit. If the equation of that line is ln open vertical bar V close vertical bar equals negative 0.027 t plus 2.5 , what is the time constant of the circuit?
Answer:
Explanation:
For discharge of capacitor in RC circuit , the relation is as follows
\(V=V_0e^\frac{-t}{\lambda}\)
V is voltage across the capacitor , V₀ is maximum voltage across capacitor , λ is time constant and t is the time after which the voltage is recorded. During discharge this will also be voltage across resistance .
Taking log on both sides
lnV = lnV₀ - \(\frac{t}{\lambda}\)
Given equation
[lnV] = - .027 t + 2.5
Comparing these equation
\(\frac{1}{\lambda} = .027\)
λ = 37 s
time constant = 37 sec.
Where should be the best fit line be drawn on a scatterplot?
A. In the center of the data
b. below the data
c. above the data.
d. none of these
A line of best fit is a straight line drawn through the most points on a scatter plot, with an equal number of points above and below the line. It is used to investigate the nature of the relationship between two variables. The correct option is d.
What is line of best fit?A straight line with the best fit is one that minimizes the distance between it and some data.
In a scatter plot of varying data points, the line of best fit is used to express a relationship. It is a result of regression analysis and can be used to forecast indicators and price movements.
It is important to note that your line does not need to pass through any of the points on the plot; it only needs to bisect the area that contains the data points.
Thus, none of the options are correct, the correct one is d.
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Sonia was experimenting with electric charges. She tied two inflated balloons together, held them next to each other, and rubbed both with a piece of wool.
What did Sonia observe, and why?
Answer: They will repel each other.
Explanation:
Two inflated balloons when rubbed with woolen cloth will lead to repeal each other because of the similar charges on both the balloons.
Rubbing both the balloons together by the woolen cloth will introduce negative charge in the balloons.
As, we know that the same charges repeal each other both of the balloons with be apart from each other.
This is due to the static electricity, the negatively charged particles jump to the positive one. When balloons are rubbed they become negatively charged.
Answer:
Sample Response: Sonia observed that the two balloons repelled each other. This is because both balloons acquired the same charge when she rubbed them with the piece of wool, and like charges repel each other.
Explanation:
Did it on Egde 2020
abigal drives her car with a constant speed of 32 miles per hour . how far can she travel in 1 hour?
Abigail drives her car with a constant speed of 32 miles per hour . How far can she travel in 1 hour?
Abigail is driving 32 miles an hour. This means she goes 32 miles in 1 hour.
In 1992, Ukrainian Sergei Bubka used a short pole to jump to a height of 6.13 m. If the maximum potential energy associated with Bubka was 4.80 kJ at the midpoint of his jump, what was his mass?
Ukrainian Sergei Bubka mass is 79.8 kJ t the midpoint of his jump.
What is mass?
Mass can be experimentally defined as a measure of the body's inertia, meaning the resistance to acceleration (change of velocity) when a net force is applied.
h=6.13 meters
mg=9.81 m/s2
PEg= 4.80 ×10^3J
The mas is Unknown=
We will Use the equation for gravitational potential energy, and rearrange it to solve for mass
Therefore PEg = mgh
mass = PEg / gh
mass = 4.80 ×10^3 / 9.81 x 6.13
mass = 79.8 kJ
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calculate the mass of a block of ice having volume 5m³. (density of ice≈920 kg/m³)
Answer:
4600 Kg/m³
Explanation:
Volume of block=5m³
Mass of block= 920 kg/m³
Density=mass × volume
=920 × 5³
=4600 /m³
The density of ice is 4600 Kg/m³
___________________________________
(Hope this helps can I pls have brainlist (crown)☺️)
Explanation:
Solution:
Here
volume=5
Density=920
Density =Mass/Volume
or,Mass=Density*Volume
or,M=920*5
so,M=4600kg
How did earth change about 2.5 billion years ago when many organisms began using photosynthesis to make food
A. The amount of oxygen in the atmosphere increased
B. Mass extinctions occurred
C. The oceans became larger
D. Rainfall increased
Magnetic resonance imaging often need magnetic fields of a strength of around 1.50 T. The solenoid is 1.80 meters long and 75.0 cm in diameter. It is tightly wound with a single layer of 2.00 mm diameter superconducting wire.
Required:
What current is needed?
Answer:
The current needed is 2387.32 A
Explanation:
Given;
strength of the magnetic field, B = 1.5 T
length of the solenoid, L = 18 m
diameter of the solenoid, D = 75 cm = 0.75 m
diameter of the superconducting wire, d = 2 mm = 0.002 m
The number of turns of the solenoid is calculated as;
\(N = \frac{length \ of \ solenoid}{diameter \ of \ wire } = \frac{1.8}{0.002} = 900 \ turns\)
The magnetic field strength is given by;
\(B = \frac{\mu_0 NI}{L} \\\\\)
Where;
I is the current needed
μ₀ is permeability of free space = 4π x 10⁻⁷ T.m/A
\(I = \frac{BL}{\mu_0 N} =\frac{1.5 \times 1.8}{4\pi \times 10^{-7} \ \times 900} \\\\I = 2387.32 \ A\)
Therefore, the current needed is 2387.32 A
Brainlist!! Help!! The nucleus contains protons and neutrons. Being positively charged, the protons repel each other. The nucleus should fly apart due to the repulsive force. Yet, the nuclei of most atoms are stable - explain.
Answer:
The reason that the nucleus of most atoms does not fall apart despite the oppositely charged protons exerting a repulsive force on each other is the strong nuclear force.
What is the strong nuclear force?The strong nuclear force is one of the fundamental forces in nature that acts between protons and neutrons in the atomic nucleus. It is a short-range force that is much stronger than the electromagnetic force (which produces the repulsion between protons).
The strong nuclear force is responsible for holding the nucleus together.
Additionally, the ratio of protons to neutrons in a nucleus also affects its stability. Therefore, if there is an imbalance in this ratio, the repulsive force between the protons can become too strong, causing the nucleus to become unstable and undergo radioactive decay.
Overall, the nucleus remains stable due to the balance between the strong nuclear force and the repulsive force between the protons.