Here is your Answer:-
In optics, an image is defined as the collection of focus points of light rays coming from an object. A real image is the collection of focus points made by converging rays, while a virtual image is the collection of focus points made by extensions of diverging rays. In other words, a virtual image is found by tracing real rays that emerge from an optical device (lens, mirror, or some combination) backward to perceived or apparent origins of ray divergences. In diagrams of optical systems, virtual rays are conventionally represented by dotted lines.
Because the rays never really converge, a virtual image cannot be projected onto a screen. In contrast, a real image can be projected on the screen as it is formed by rays that converge on a real location.
What is the KE of a 4 kg mass at 3 m/s?
Answer:
12
Explanation:
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[tex]\tt KE=\dfrac{1}{2}mv^2\\\\KE=\dfrac{1}{2}\times 4\times3^2\\\\KE=18~J[/tex]
How long does it take light to reach us from the sun, 1. 50 ×108km away?.
Answer:
8 minutes
Explanation:
It take 8 minutes for light to reach us from the sun.
A device of 400 W works in 220 V power supply . What is the Current passing through the Device ?
Question :-
A Device of 400 W works in 220 V Power supply. What is the Current passing through Device ?Answer :-
Current is 1.81 Ampere .[tex] \rule {180pt} {2pt} [/tex]
Given :-
Power = 400 WattVoltage = 220 VoltTo Find :-
Current = ?Solution :-
As per the provided information in the given question, we have been given that the Power of the Device is 400 Watt . Voltage is given 220 Volt . And, we have been asked to calculate the Current of the Device .
For calculating the Current , we will use the Formula :-
Current = Power / VoltageTherefore , by Substituting the given values in the above Formula :-
⇒ Current = Power / Voltage
⇒ Current = 400 / 220
⇒ Current = 1.81
Hence :-
Current = 1.81 Ampere .[tex] \underline {\rule {180pt} {4pt}} [/tex]
pls help me to answer this
Answers:
TrueTrueTrueTrueTrueTrueTrueFalseTrueTrueWeirdly it seems like each answer choice, except problem 8, is "true".
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Explanations:
Think of a pebble dropping into a water to cause a ripple. The energy going outward in all directions requires the water as the medium for that energy wave to travel. Each particle bumps into another to transfer the energy.This is fairly self explanatory that I'm not sure what to write as an explanation here. Longitudinal waves are ones where they act like a slinky. A blast of energy causes compression and that compression leads to expansion later on (followed by further cycles of compression+expansion). This chain reaction causes a domino effect so the sound wave reaches the target to be absorbed or reflected.This is true because light is much faster than sound. This is why fiberoptic cables are used to transmit voices on a telephone line rather than use the sound of the voices themselves to transmit. It's also why, during a thunderstorm, a flash of light strikes first before the rumbling sound of thunder follows a few seconds after.This is true and it shouldn't take too much convincing to see how "electromagnetic" breaks up into "electrical" and "magnetic". These types of waves can travel through the empty vacuum of space without needing a medium like mechanical waves do. This is why energy of the sun can reach us. Visible light is part of the spectrum along with stuff like x-rays, gamma rays, microwaves, and radio waves.There's not much to say here. Shadows are the absence of light.This is true because a beam of light bounces off an object, and reflects into our eyes so we can see the object. Unlike every other answer choice, this answer is false. Doctors don't use microwaves to get pictures of teeth and bones. Instead they use x-rays.This is true. Refer to the ROYGBIV color scale for more info.This seems a bit vague. Does your teacher mean visible light? If so, then yes our eyes can detect it. Otherwise for things like x-rays we cannot detect these wavelengths. I'll assume visible light for now.explain why light is used for a particular task
Answer:
for seeing small object of low contrast
Explanation:
for example a person who's knitting or sewing would need extra light to see details...
Describe, using Bernoulli’s principle, how roofs are lifted off buildings in tornadoes.
During tornadoes
The speed air goes above the roofsSo the air above the roof is gone .So the roof shifts upwards to avoid low air pressure9:41 AM
What is the volume of a star
Answer:
1
Explanation:
because every number has coffitiant of 1
Answer:
defined as the mean volume of all the parts of an object which can be seen unobscured in all directions from a particular point inside the object.
for a neutron star : a6 = 3/5(Gm^2 / Ro)
= 5.8 × 10^-37MeV
Me - Mass of electron = 9.11 × 10^-31 kg
V - Volume of a neutron star
a6 - constant
V = a6 / 5.8 × 10^-37Me
What is the solubility of KNO3 at 80 degrees?
Answer:
100 g H₂O
Explanation:
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A cloud directly above you is about 10° across. From the weather report you know that the cloud is at an altitude of 2200 m. How wide is the cloud?
Answer:
2 π Θ = 360 where Θ is the angle of 1 rad = 57.3 deg
W = R Θ = 2200 m * 10 / 57.3 = 384 m
Note: The difference between radian measure (distance along arc of circle) and the chord of a circle is quite small for 10 deg - probably the cloud is not completely flat anyway
A box of mass m is initially at rest at the top of a ramp that is at an angle with the horizontal. The block is at a height h and length L
from the bottom of the ramp. The block is released and slides down the ramp. The coefficient of kinetic friction between the block and
the ramp is u. What is the kinetic energy of the box at the bottom of the ramp?
Hi there!
We can use the work-energy theorem to solve.
Recall that:
[tex]E_i = E_f[/tex]
The initial energy equals the final energy (Conservation of Energy). However, we must take into account energy dissipated due to friction in this instance.
The energy lost due to friction is equivalent to the work done by friction. Recall the following:
Normal force on an incline: [tex]N = Mgcos\theta[/tex]Force due to friction: [tex]F_f = \mu N = \mu mgcos\theta[/tex]The work due to a force is:
[tex]W = F \cdot d \\[/tex]
Since the displacement is in the same direction as the force, the dot-product becomes Fd.
The work due to friction then becomes:
[tex]W_f = \mu mgdcos\theta[/tex]
The work due to friction is SUBTRACTED from the initial potential energy.
Initial energy = GPE = mgh
Final energy = KE
Therefore:
[tex]\boxed{mgh - \mu mgdcos\theta = KE}[/tex]
300N effort is applied to lift the load of 900N by using a first class lever. If the distance between the load and fulcrum is 20m, the calculate the distance from fulcrum to the effort.
Answer:
Effort=300N
Load=900N
Load distance=20m
Now,
Ed=(L*Ld)/E
Ed=(900*20)/300
Ed=1800/300
Ed=6m
Explanation:
Answer:
This is the correct answer!
Effort=300N
Load=900N
Load distance=20m
Now,
Ed=(L*Ld)/E
Ed=(900*20)/300
Ed=1800/300
Ed=6m
Hence, the distance from fulcrum to effort is 6 m
Explanation:
Plato
Atoms of which pair of elements will form metallic bonds in a compound?
A. Na and Br
B. Be and CI
C. Ag and Ca
D. I and F
Answer:
The answer (I think) would be D. I and F.
Description for Iiotibial band (ITB) syndrome
Iliotibial band syndrome occurs when a tendon called the iliotibial band rubs against the hip or knee bones, causing it to become inflamed or swollen. The tendon runs from the top of your pelvic bone down to your knee on the outside of your leg. When it becomes overly tense, it grinds on your bones (tight).
The repetitive bending of the knee during physical activities such as running, cycling, swimming, and hiking is a common cause of iliotibial (IT) band syndrome. Fascia, or connective tissue, makes up the IT band. It is an elastic collection of fibers that extends from the hip to below the knee along the thigh.
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e yea guess so but ummm
Answer:
u right u right, curious what color shade that is
Answer:
Explanation:
......................
electricity and magnetism
Answer:
Electricity is defined as which possess by flow of eloctrons.
Using the same set-up question #23 what happens if the voltage of the battery is decreased by half?
A. The voltage at each bulb increases by half
B. The voltage at each bulb decreases by half
C. The voltage at each bulb stays the same
Answer:
I think the answer is B
Explanation:
If the Voltage is halved, then the current goes down as well so the voltage drop across the lamps will decrease as well.
The loud explosive noise a plane makes when we hear the shock wave that comes from it when it is traveling at or above the speed of sound is called ______________.
Answer:
Sonic boom.
When something breaks the sound barrier. (Moves faster than sound, like lighting)
Explanation:
Try flying a plane.
A 65-kg woman exerts 18 newtons of force onto a 20-kg box. How many newtons of force does the box exert on the woman?
Answer:
I think it's 18 newtons.
Explanation:
Using the formula F= ma , what acceleration results from
exerting a 25 N horizontal force on a 0.5 kg ball at rest?
Answer:
50 m/s²
Explanation:
Givens:
F = 25N horizontally
m = 0.5 kg
a = ?
We are solving for a, so plug in the known values into the formula F = ma
25N = 0.5kg*a
Divide both sides by 0.5kg
(Note that 1N = 1kg*m/s², so when you divide, kg cancels out leaving you with m/s²)
50 m/s² = a
A student releases a ball from rest on an inclined plane and measures that it travels a distance of 0.5 m in a time of 2.0 s. The acceleration of the ball is:
The acceleration of the ball is 0.25 m/s². Therefore option B is correct.
To determine the acceleration of the ball, we can use the equation of motion for objects moving in a straight line with constant acceleration:
[tex]\[ d = ut + \frac{1}{2}at^2 \][/tex]
where d is the distance traveled, u is the initial velocity (which is zero in this case since the ball is released from rest), a is the acceleration, and t is the time.
In this scenario, the distance traveled is 0.5 m, the initial velocity is 0 m/s, and the time taken is 2.0 s. Plugging these values into the equation, we have:
[tex]\[ 0.5 = 0 + \frac{1}{2} \cdot a \cdot (2.0)^2 \][/tex]
Simplifying the equation, we get:
[tex]\[ 0.5 = 2a \][/tex]
Dividing both sides by 2, we find:
[tex]\[ a = 0.25 \, \text{m/s}^2 \][/tex]
Therefore, the acceleration of the ball is 0.25 m/s². The correct answer is B) 0.25 m/s².
Know more about acceleration:
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Your question is incomplete, but most probably your full question was,
A student releases a ball from rest on an inclined plane and measures that it travels a distance of 0.5 m in a time of 2.0 s. The acceleration of the ball is
A. 0.125 m/s2.
B. 0.25 m/s2.
C. 0.5 m/s2.
D. 1.0 m/s2.
1. What causes tides?
A. The energy generated by waves.
B. The changes in Earth's climate.
C. The gravitational pull of the Sun on Earth's oceans.
D. The gravitational pull of the Moon on Earth's oceans.
Answer:
D.) The gravitational pull of the Moon on Earth's oceans.
Explanation:
A.) is incorrect because waves caused by the moon's gravitational pull. Waves and tides are essentially the same thing.
B.) is incorrect because climate change only has a small, indirect effect on the tides (i.e., rising sea levels).
C.) is incorrect because while the gravitational pull of the Sun affects the tides to some extent, it is nowhere near as influential as the Moon's gravitational pull.
D.) is correct because the gravitational forces between the Moon and the Earth are the primary cause of the tides.
The gravitational force is always attractive, while the electric force is both attractive and replusive. What accounts for this difference?
Define Electromagnet.?
Thnx!
Answer:
A soft metal core made into a magnet by the passage-way of elecric current throus a coill around it.
Answer:
An electromagnet is a magnet that magnetic field is generated by an electric current. Wire coiled into a coil is used to make electromagnets. A current flowing through the wire produces a magnetic field that is focused in the hole, which serves as the coil's core.
Explanation:
A 1.5 kg ball is dropped from a height of 2.Gm. Assuming energy is
conserved within the system, what is the speed of the ball the instant
before it strikes the ground?
Answer:
Plug in the given values and solve for the final velocity. Remember, when the ball is on the ground it has a height of zero.
Explanation:
Why do conductors transfer heat faster than insulators?
Answer:
Conduction is usually faster in certain solids and liquids than in gases. Materials that are good conductors of thermal energy are called thermal conductors. Metals are especially good thermal conductors because they have freely moving electrons that can transfer thermal energy quickly and easily.
Heat transfer by convection happens through the air, and there are millions of minuscule air spaces between the fibers. Heat transfer by radiation is also slow since one fiber must radiate its heat to another.
When we give heat then kinetic energy is increase and this heat is transferred from hot metal to cold metal through this free electrons. As in insulator the free electrons are negligible so that the heat is not transferred from hot junction to cold junction due to absence of this free electrons.
Explanation:
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In how many ways can sound be produced
Answer:
1
Explanation:
sound is produced by vibration
Because they have an extended structure, elements that are _
tend to be in the _
state at room temperature.
Answer:
Metal, middle of the periodic table, solid.
Explanation:
Because they have an extended structure, elements that are metal tend to be in the middle of the periodic table state at room temperature as solid.
choose the correct answer
if the force which act on object increased to triple it's value and the area decreased nine times the the pressure will
a) increase 3 times
b) decrease 3 times
c) decrease 9 times
d) increase 27 times
If the force which act on object increased to triple it's value and the area decreased nine times the the pressure will..?
Answer:The pressure will decrease 3 times.
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A steel cable has a diameter of 0.16 cm. The tensile strength of the steel is 4 × 108 N/m2. What is the approximate tension force that will snap the cable?
A. 8.0×[tex]10^{8}[/tex] N
B. 5.0×[tex]10^{7}[/tex] N
C. 8.0×[tex]10^{6}[/tex] N
D. 4.0×[tex]10^{8}[/tex] N
E. 800 N
Answer:
800 N
Explanation:
The formula to solve this equation is stress = Force/ Area.
The first step is to rearrange this equation for force: Force = stress * area
The second step is to determine the area: A = pi/4 * d^2
A = pi/4 * (0.0016m)^2=0.00000201 m^2
The third step is to substitute the area back into the equation:
Force = (4 * 10^8)(0.00000201) = 804 N
804 N is approximately 800 N