Joe first focuses his attention (and his eyes) on the tree. The focal length of the cornea-lens system in his eye must be __________ the distance between the front and back of his eye. View Available Hint(s) Joe first focuses his attention (and his eyes) on the tree. The focal length of the cornea-lens system in his eye must be __________ the distance between the front and back of his eye. greater than less than equal to
Answer: The focal length of the cornea-lens system in his eye must be LESS THAN the distance between the front and back of his eye.
Explanation:
The human eye the front part of the eye is the CORNEA. This is the tough white transparent part of the eye that helps in the refraction of light rays. While the backside of the eye is the RETINA. This is the part of the eye when images are focused.
When a normal eye is at rest, parallel rays from a distant object are focused on the retina. The ability of the eye - lens to focus points at different distances on the retina is known as accomodation. The adjustment of the eye lens to focus objects of varying distances is brought about by the ciliary muscles. The have the ability to change the shape of the eye which leads to change in focal length.
When a person with normal vision looks at a distant object at infinity, the lens brings parallel rays to focus on the retina. Thus, the furthest point which the eye can see distinctly is called the far point of the eye and it's infinity for a normal eye. But Joe was able to focus his eye on the tree, meaning that the tree was within his near point. This is the nearest point at which an object is clearly seen. Therefore, when the effective focal length of the cornea-lens system changes, it changes the location of the image of any object in one's field of view.
An average man is 80 k (800 N) and the area of the shoes he is wearing is 0.0092 m2. What is the pressure he is exerting on the ground?
Answer:
P = 86956.52 Pa
Explanation:
Data:
F = 800 NA = 0.0092 m²P = ?Use the formula:
[tex]\boxed{\bold{P=\frac{F}{A}}}[/tex]Replace and solve:
[tex]\boxed{\bold{P=\frac{800\ N}{0.0092\ m^{2}}}}[/tex][tex]\boxed{\bold{P=86956.52\ Pa}}}[/tex]The pressure it exerts on the ground is 86956.52 Pascal.
Greetings.
If the frequency of a light wave is doubled, what happens to the wavelength of the wave?
Answer:
If the frequency is doubled, the wavelength is only half as long. 3. ... As the frequency slows down, the wavelength increases.
i love u whoosever seeing my question
A plane electromagnetic wave, with wavelength 5 m, travels in vacuum in the positive x direction with its electric vector E, of amplitude 229.1 V/M, directed along y axis. What is the time-averaged rate of energy flow in watts per square meter associated with the wave
Answer:
Explanation:
E₀ = 229.1 V/m
E = E₀ / √2 = 229.1 / 1.414 = 162 V/m
B = E / c ( c is velocity of em waves )
= 162 / (3 x 10⁸) = 54 x 10⁻⁸ T
rate of energy flow = ( E x B ) / μ₀
= 162 x 54 x 10⁻⁸ / 4π x 10⁻⁷
= 69.65 W per m².
Will give brainliest! 50 points!!!
When the polarity of a moving magnet through a coil doubles the electromagnetic field _________.
A. Increases
B. Decreases
C. Stays the same
Answer:
C
Im not totally sure but that's what my science teacher taught me sorry if is wrong
With a thunderstorm brewing, an electric field of magnitude 2.0 × 102 newtons/coulomb exists at a certain point in the earth’s atmosphere. If an electron at that point has a charge of -1.6 × 10-19 coulombs, what is the magnitude of the force on the electron as a result of the electric field?
A.
2.0 × 10-6 newtons
B.
3.2 × 10-17 newtons
C.
5.8 × 105 newtons
D.
6.4 × 10-3 newtons
E.
1.7 × 104 newtons
Answer:
The correct option is (b).
Explanation:
Given that,
Electric field, [tex]E=2\times 10^2\ N/C[/tex]
We need to find the magnitude of the force on the electron as a result of the electric field.
We know that, the electric force is given by :
[tex]F=qE\\\\=1.6\times 10^{-19}\times 2\times 10^2\\\\F=3.2\times 10^{-17}\ N[/tex]
So, the required force on the electron is equal to [tex]3.2\times 10^{-17}\ N[/tex].
The current in the wires of a circuit is 180.0 milliAmps. If the voltage impressed across the ends of the circuit were tripled and the resistance were halved, then its new current would be
Answer:
Post a picture of it
Explanation:
The formula length x width x height is used to calculate the volume of a type of
A
gas.
B
solid.
C
liquid.
D
plasma.
Answer:
D
Explanation:
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What's the difference between heat and temperature?
Answer:
Heat is the transfer of thermal energy between molecules within a system and is measured in Joules (J). It measures how energy moves or flows. Temperature is the average kinetic energy of molecules within a material or system and is measured in Celcius (°C), Kelvin (K), Fahrenheit (°F), or Rankine (R).
A 34-kg child runs with a speed of 2.8 m/s tangential to the rim of a stationary merrygo-round. The merry-go-round has a momentum of inertia of 510 kg*m2 and a radius of 2.31 m. When the child jumps onto the merry-go-round, the entire system begins to rotate. What is the angular speed of the system
Answer: [tex]0.43\ rad/s[/tex]
Explanation:
Given
Mass of child [tex]m=34\ kg[/tex]
speed of child is [tex]v=2.8\ m/s[/tex]
Moment of inertia of merry go round is [tex]I=510\ kg.m^2[/tex]
radius [tex]r=2.31\ m[/tex]
Conserving the angular momentum
[tex]\Rightarrow mvr=I\omega \\\Rightarrow 34\times 2.8\times 2.31=510\times \omega\\\\\Rightarrow \omega=\dfrac{219.912}{510}\\\Rightarrow \omega=0.43\ rad/s[/tex]
Shadow is formed when an_____
object comes in the
way
of light.
Answer:
shadow is formed when an opaque object comes on path of light shadows are formed because light travels in a straight line and it can't pass through an opaque object
Answer:
Opaque object
Explanation:
Shadow forms when an opaque object comes in the way of light. Because opaque objects does not allow light to pass through them and light travels in a straight line. Hence a retreating figure of the same opaque object ,forms and it's black in colour without any detail just outline.
what is the full meaning of D.D.T
What is the magnification of a real image if the image is 15.0 cm from a lens and the object is 60.0 cm from the lens?
Answer:
soluble
Explanation:
Answer:
-0.25
Explanation:
con 110
Which classification or category would tennis belong to?
A. Target
B. Striking/Fielding
C. Net/Wall
D. Invasion
Answer:
C
Explanation:
Tennis would belong to net wall games .
Imagine a truck crashes into a building. What kind of sound wave does this make?
Thr wave of sound that makes the truck is vibration
Calculate the kinetic energy of a 790-kg roller coaster traveling at a velocity of 20.7 m/s.
Answer:
The answer is 169253.55 joules
Answer:
[tex]\displaystyle KE = 169254 \ J[/tex]
General Formulas and Concepts:
Energy
Kinetic Energy Formula: [tex]\displaystyle KE = \frac{1}{2}mv^2[/tex]
KE is kinetic energy (in J)m is mass (in kg)v is velocity (in m/s)Explanation:
Step 1: Define
[Given] m = 790 kg
[Given] v = 20.7 m/s
Step 2: Solve
Substitute in variables [Kinetic Energy Formula]: [tex]\displaystyle KE = \frac{1}{2}(790 \ kg)(20.7 \ m/s)^2[/tex][KE] Evaluate exponents: [tex]\displaystyle KE = \frac{1}{2}(790 \ kg)(428.49 \ m^2/s^2)[/tex][KE] Multiply: [tex]\displaystyle KE = (395 \ kg)(428.49 \ m^2/s^2)[/tex][KE] Multiply: [tex]\displaystyle KE = 169254 \ J[/tex]Following the big bang gaseous clouds condensed together to form the first stars in the universe. What is the attractive force that causes the gas to
come together?
O Energy
Electromagnetism
O Dark Matter
O Gravity
Answer:
Gravity
gravity pulled the gasses together over long period of time
A certain object is subject to two forces: a 10-N force straight up and a 10-N force straight down. A student states that since both forces are in the vertical direction, the object cannot be moving horizontally. Why is this an incorrect conclusion?
A.
The vertical forces are balanced.
B.
Vertical net forces can cause horizontal motion.
C.
A horizontal force is not required for horizontal movement.
D.
Two vertical forces can combine to form a horizontal resultant force.
Answer:
C. Consider projectile motion. If an object starts out at some angle and only vertical forces (gravity) are present, the horizontal speed remains constant thruout the motion.
EMERGENT please answer
Answer:
meaning i dont know sorry
To push a heavy box up a ramp into a moving van, what could be used to decrease the force of friction?
Check all that apply.
A. Push harder on the box.
B. Put a lubricant between the ramp and the box.
C. Place another box on top of the one you are trying to slide,
D. Place rollers or wheels on the bottom of the box.
Answer:
B. Put a lubricant between the ramp and the box
D. Place rollers or wheels on the bottom of the box
Answer:
D.Place rollers or wheels on the bottom of the box.
Highlight the letter of each sentence that is true about a geocentric model.
Earth is stationary at the center
Objects in the sky move around Earth
The sun is the center of the solar system
The planets revolve around the sun
Answer:
The sun is the center of the solar system.
The planets revolve around the sun.
What does the if statement in a macro do?
It changes the data type of the macro based on the results of a query.
It attaches the macro to a query or report prior to printing to make it readable.
It creates a control in a form and connects the macro to the control’s event property.
It defines a criterion that evaluates to true or false and specifies actions to take if it is true.
Answer:
It defines a criterion that evaluates to true or false and specifies actions to take if it is true.
Explanation:
EDGE2020
Answer:
D
Explanation:
HELP PLS
3 paragraph summary/essay due today for science. I need a 3 paragraph summary with at least 7 sentences on Waves ! pls help.
There are a variety of waves from light waves to mechanical waves. Waves can exhibit different effects like the Doppler Effect.
All light waves behave in a similar manner. They either get transmitted, reflected, absorbed, refracted, polarized, diffracted, or scattered based off of the composition of the object and the wavelength of the light.
According to Wikipedia, “One important property of mechanical waves is that their amplitudes are measured in an unusual way, displacement divided by (reduced) wavelength. When this gets comparable to unity, significant nonlinear effects such as harmonic generation may occur, and, if large enough, may result in chaotic effects.” Mechanical waves are chaotic and its “amplitudes” are measured unusually.
Diffraction is when light bends around objects and spread after passing out through small openings. “Diffraction occurs with all waves, including sound waves, water waves, and electromagnetic waves such as light that the eye can see.”-Wikipedia. Here is the formula to Diffraction: d sin θ = nλ
Doppler effect can occur for any type of wave like sound or water waves. An example of this is when we hear a police car with its sirens on, coming towards us. The closer you are to the police car, the higher the wavelength, but the farther away you are, the lower the wavelength.
Select the correct answer. In a given chemical reaction, the energy of the products is greater than the energy of the reactants. Which statement is true for this reaction? A. Energy is absorbed in the reaction. B. Energy is released in the reaction. C. No energy is transferred in the reaction. D. Energy is created in the reaction. E. Energy is lost in the reaction.
what is relative density
Answer:
Relative density, or specific gravity, is the ratio of the density (mass of a unit volume) of a substance to the density of a given reference material.
Explanation:
True or False: Our food has potential energy?
Answer:
True
Explanation:
just cuz
If at a particular instant and at a certain point in space the electric field is in the x-direction and has a magnitude of 5.00 V/mV/m, what is the magnitude of the magnetic field of the wave at this same point in space and instant in time
Answer:
the magnitude of the magnetic field of the wave is 16.7 nT
Explanation:
Given the data in the question;
Electric field E = 5.00 V/m
we know that the expression for the electric field of an electromagnetic wave in terms if magnetic field is;
E = cB
where c is the speed of light ( 3 × 10⁸ m/s )
and B is the magnetic field
so we solve for the magnetic field
B = E / c
we substitute in the value of E and c
B = (5.00 V/m) / (3 × 10⁸ m/s)
B = 1.67 × 10⁻⁸ T
B = 1.67 × 10⁻⁸ T [tex]( \frac{1nT}{10^{-9}T} )[/tex]
B = 16.7 nT
Therefore, the magnitude of the magnetic field of the wave is 16.7 nT
HELPPP WILL MARK BRAINLIST What type of image is formed by a lens if m= 2.7?
A. The image is smaller than the object and is virtual.
B. The image is smaller than the object and is real.
C. The image is larger than the object and is real.
D. The image is larger than the object and is virtual.
Answer:
the answer is C
Explanation:
So, the formed image will be real and inverted.
why do you think we cannot use a common fuel like diesel or gasoline for space travel ?
Answer:
Explanation:
it take oxygen in the atmosphere to burn it... in space there isn't any air :0