Answer:
q = 224 mm, h ’= - 98 mm, real imagen
Explanation:
For this exercise let's use the constructor equation
[tex]\frac{1}{f} = \frac{1}{p} + \frac{1}{q}[/tex]
where f is the focal length, p and q are the distance to the object and the image respectively.
In a mirror the focal length is
f = R / 2
indicate us radius of curvature is equal to the diameter of the eye
R = 3,50 10² mm
f = 3.50 10² /2 = 1.75 10² mm
they also say that the distance to the object is p = 0.800 10³ mm
1 / q = 1 / f - 1 / p
1 / q = 1 / 175 - 1 /800
1 / q = 0.004464
q = 224 mm
to calculate the size let's use the magnification ratio
m = [tex]\frac{h'}{h} = - \frac{q}{p}[/tex]
h '= [tex]- \frac{q}{p} \ h[/tex]
h ’= - 224 350 / 800
h ’= - 98 mm
in concave mirrors the image is real.
What Law and explain why.
An airplane turns on its jets to accelerate down a runway.
Answer:Newton's 2nd law
Explanation:Newton's 2nd law also states that the rate at which an object changes speed is proportional to the force that is exerted. Engines provide thrust and accelerate a plane forward along the runway. If the engines supply a small force, only a small acceleration will result.
1 state the laws of refraction and define refractive index
2 A beam of light is incident from air to water at an angle of 30°. Find the angle of refraction if the refractive index of water is 4/3
Answer:
resiprical 3/412358965
The angle of incidence of another red ray is 65º. The refractive index of the glass of block
ABCD for red light is 1.62.
(i) Calculate the angle of refraction in the glass for this ray.
Answer:
34º
Explanation:
The computation of the angle of refraction in the glass for this ray is shown below:
Given that
the angle of incidence of another red ray is 65º
And, n_1 = 1
n_2 = 1.62
According to shell law
n_1 sin [tex]\theta[/tex]_1 = n_2 sin [tex]\theta[/tex]_r
sin [tex]\theta[/tex]_r = 1 sin 65÷ 1.62
= 0.559
[tex]\theta[/tex]_r = sin^-1 (0.559)
= 34º
why will a plant die if it doesn't receive sunlight?
Answer:
Sunlight allows plants to perform photosynthesis, a process which is required for plant growth and health. ... Plants that are denied sufficient light will eventually lose their color and die. Plants deprived of light will grow upward, stretching their stems more rapidly that usual, searching for light.
Answer:
Sunlight allows plants to perform photosynthesis, a process which is required for plant growth and health. ... Plants that are denied sufficient light will eventually lose their color and die. Plants deprived of light will grow upward, stretching their stems more rapidly that usual, searching for light
Explanation:
i got this from
https://sciencing.com/what-happens-to-plants-if-they-have-no-sun-12486997.html#:~:text=Sunlight%20allows%20plants%20to%20perform,for%20plant%20growth%20and%20health.&text=Plants%20that%20are%20denied%20sufficient,that%20usual%2C%20searching%20for%20light.
Find the formula and scientific units of the following:
Speed =
Velocity =
Momentum =
Velocity =
Acceleration =
Force =
Answer:
speed :m/s
velocity:m/s-¹
acceleration:m/s²
force:kgms-²
Explanation:
I hope May be correct
Speed: It is the rate at which object covers or travelled particular distance or rate at which objects changes its position. S.I. unit for speed is metre per second (m/s).
Speed (s) = distance (d) / time (t)
Velocity: Distance covered by a moving object in a particular direction per unit time. S.I. unit of velocity is m s-1 or m/s.
Velocity (v) = Total displacement (d) / time take(t)
Momentum: It is quanity of motion of the object. S.I. Unit is Kg.m.s-1
Momentum (p) = Mass (m) X Velocity (v)
Acceleration: Rate at which an object velocity changes with respect to time. S.I. unit is metres/second2 (m/s2) Acceleration (a) = Change in velocity/ time taken
Force: When an object changes it position or direction due to external agent. S.I. unit of force is (Kg m/s2).
Force (F) = Mass(m) × Acceleration (a)
To learn more about following terms:
https://brainly.ph/question/122934
a student had rolled 114 dice and removed all those landed on the number six. the student rolled the remaining dice again and removed those that landed on a six. when the student had rolled the dice 20 times there were 9 dice left.
Calculate the most likely number of times that the student had rolled the dice before the number of dice had halved.
Answer:
4 rolls
Explanation:
The probability of rolling a 6 is 1/6 = 0.1667 (4.d.p)
This means that approx. 1/6 of the dice will land on a 6.
If the student removes a 1/6 of the dice each time, it means that the number of dice is decreasing by 1/6 each roll (or multiplying by 5/6).
114/2 = 57
By multiplying 114 by 5/6 and continuing we can see how many times it takes for us to get past 57.
Roll 1: 114 x 5/6 = 95
Roll 2: 95 x 5/6 = 79.17
Roll 3: 79.17 x 5/6 = 65.97
Roll 4: 65.97 x 5/6 = 54.98
Most likely to take 4 rolls before halving the number of dice.
You could also solve this problems by writing an equation and solving using logs but I think this method is easier to understand.
Hope this helped!
Which is equivalent to 1 W?
Answer:
1 joule per second.
Explanation:
The watt (symbol: W) is a unit of power or radiant flux. In the International System of Units (SI), it is defined as a derived unit of (in SI base units) 1 kg⋅m2⋅s−3 or, equivalently, 1 joule per second.
Chris walks 25 m in the positive direction on a number line, then turns around and walks 15 m in the opposite direction. What is the magnitude of the displacement of Chris?
A. -10 m
B. 40 m
C. 10 m
Answer:
[tex] |d| = |(25 - 15)| \\ |d| = 10 \: m[/tex]
Which statement describes an interacting force pair represented by the third law of motion? The force exerted by a cyclist equals the combined forces of friction and air resistance. A car exerts a force on a bug as they collide and the bug exerts an equal force on the car. Gravity exerts a downward force on a refrigerator and the normal force pushes up on the refrigerator. Two people pull on opposite ends of a rope, but the rope does not move because the people pull with equal forces.
Answer:
A car exerts a force on a bug as they collide and the bug exerts an equal force on the car.
Explanation:
Newton's third law of motion states that for every action there is an equal and opposite reaction.
Action-reaction force pairs make it possible for fishes to swim, birds to fly, cars to move etc,
Furthermore, take for example, While driving down the road, a firefly strikes the windshield of a car (Action) and makes a quite obvious mess in front of the face of the driver (Reaction) i.e The firefly hit the car and the car hits the firefly.
Hence, the statement which best describes an interacting force pair represented by the third law of motion is, a car exerts a force on a bug as they collide and the bug exerts an equal force on the car.
The ultimately implies that, in every interaction, there is a pair of forces acting on the two interacting objects in this case, the car and bug. The size of the force on the car equals the size of the force on the bug. These two forces are called action and reaction forces and are the subject of Newton's third law of motion.
please help me out i'm so depressed and such a failure
how does the brightness of the lamp (L) vary if we dispalce the cursor (C) of the rheostat
a)Towards A
b) Towards B
Answer:
I reckon towards b. Let me know if im right
can you help me answer these two please
2.How did astronomers figure out that the earth is round
here's only one question
Describe the crust (in more than 1 sentence). Include a discussion of how the temperature changes on the crust.
Solution :
Crust
In the field of geology, the crust may be defined as the outermost solid shell of a planet. It forms the topmost outer hard layer of the earth surface. Earth has three layers. They are the crust, mantle and the core.
When we go deeper and deeper inside the earth's crust, the temperature rise. In the crust, on the surface of the earth, the temperature is normal and is atmospheric. As we go deep down the core, the temperature rise and it is highest at the core where all the rock and the iron is in the form of the molten lava.
According to the Geologist, beneath the earth's crust, for every mile we go inside the temperature rises by 15 degree Fahrenheit.
What is the driving force behind the movement of Earth's plates?
Convection currents in the mantle are slowly causing the plates to move.
The magnetic pull of the poles are pulling the plates apart.
The inertia of the rotation of the Earth causes the plates to move.
The aliens are playing with the Earth like a puzzle.
Convection currents in the mantle are slowly causing the plates to move.
07. 1
Explain why the light refracts as it passes from air into glass. GCSE PHYSICS HIGHER
Answer:
Light is faster in air than in glass so the speed of light decreases when it passes through glass.
Which is a leading theory for the formation of fossil fuels?
Answer:
The most widely accepted theory for the formation of fossil fuel is that fossil fuel was formed over time from decaying organic matter. Organisms died and were buried in the ground millions of years ago.
Explanation:
g00gle answer! so change it up a little :P
hope this helps :)
During a phase change, such as when an ice cube melts, its temperature —
Answer:
Will start to decrease until it reaches the room temperature where it transforms from solid to liquid as the bonds are weakening and thus water has a low melting point also known as h20
Explanation:
The truck travels for 1.5 hours as it makes the 90 mile trip from the warehouse to the store. What was the average speed in miles per hour of the truck while driving to deliver the product to the waiting customers?
Answer: 60 mph
Explanation:
Given
Truck takes [tex]1.5\ hr[/tex] to make [tex]90\ mile[/tex] trip
The average speed is the ratio of total distance traveled to the total time taken.
[tex]v_{avg}=\dfrac{\text{Distance}}{\text{time}}\\\\v_{avg}=\dfrac{90}{1.5}\\v_{avg}=60\ mph[/tex]
What is the overall moment?
7. A train 100 m long is moving with the velocity of 72 km/h. Find the time it takes to cross the bridge which is 2 km long?
a) 1050 S
b) 10500 s
c) 10.5 s
d) 105 s
Answer:
d) 105 s
Explanation:
Given the following data;
Distance A (length of train) = 100 m
Velocity = 72 km/h to meters per seconds = 72 * 1000)/3600 = 72000/3600 = 20 m/s
To find the time;
Time = distance/speed
Time = 100/20
Time = 5 seconds.
II. When the distance (bridge) is 2km;
Distance B = 2km = 2*1000 = 2000 meters
Time = distance/speed
Time = 2000/20
Time = 100 seconds
Therefore, total time = 5 + 100 = 105 seconds
A proton is moved so that its electric potential energy increases from 2.0 × 10-18 J to 6.0 × 10-18 J. The magnitude of the charge on a proton is 1.602 × 10-19 C.
The electric potential difference through which the proton moved, to the nearest whole number, is
V.
Answer:
25v
Explanation:
right on edge
Think about the mice shown below. Using the space below numbered 1, describe what is happening from figure 1 to 3.
Answer: Natural selection is taking place.
Explanation:
As you can see, the lighter colored mice are more visible than their surroundings, so the hawk picks them off one by one. the brown mice on the other hand are less visible, blending in with their surroundings, so they are successful, and pass on the genes that allow them to survive better.
- anonymous
In the first picture, the mice are in the environment looking for resources necessary for their survival. In the second picture, mice are being hunted by a predator. In the third figure, the rat population decreased as the light rats died and the dark rats survived.
The three figures represent a process called Natural Selection.
What is Natural Selection?It's a biological process.It is a process that causes biological evolution.It is the process that allows the survival of the most adapted individuals to the environment.In the figures, we can see that there is a community of dark and light mice. Dark mice are more adapted to the environment, as they can camouflage themselves more easily.
This camouflage allows the dark mice to evade predators more efficiently. On the other hand, light mice are easily noticed by predators and for this reason, they are quickly devoured.
This causes the number of light mice to decrease to the point where they cease to exist. Meanwhile, the dark mice survive and pass this trait on to their descendants.
More information about natural selection at the link:
https://brainly.com/question/2725702
. Nuclear fusion reaction is more reliable and sustainable source of energy than nuclear fission chain reaction. Justify this statement with plausible arguments
Answer:
please give me brainlist and follow
Explanation:
Nuclear fusion can be more reliable than nuclear fission in energy generation due to the following reasons: There are no radioactive waste products obtained as a result of nuclear fusion, unlike nuclear fission. This is because the elements involved in Nuclear fusion are relatively radioactively stable elements.
Which of the following is an example of an omnivore?
A
an herb like basil, which gets energy from the sun
B
a dog, which eats meat and vegetables
с
a dinosaur that only eats marsh grasses
D
a buzzard that only eats roadkill
Answer:
B a dog omnivor is like us we are hunter gatherers, plants and meat
Answer:
B
Explanation:
omnivores eat both crops and meat .The dog exhibited this trait.
define the artificial silk?
Answer:
Artificial silk or art silk is any synthetic fiber which resembles silk, but typically costs less to produce.
Explanation:
Answer:
Artificial silk or art silk is any synthetic fiber which resembles silk, but typically costs less to produce. Frequently, "artificial silk" is just a synonym for rayon. When made out of bamboo viscose it is also sometimes called bamboo silk.
A bus contains a 1500 kg flywheel (a disk that has a 0.600 m radius) and has a total mass of 10,000 kg.
(a) Calculate the angular velocity the flywheel must have to contain enough energy to take the bus from rest to a speed of 20.0 m/s, assuming 90.0% of the rotational kinetic energy can be transformed into translational energy.
(b) How high a hill can the bus climb with this stored energy and still have a speed of 3.00 m/s at the top of the hill? Explicitly show how you follow the steps in the Problem-Solving Strategy for Rotational Energy.
Answer:
Explanation:
moment of inertia of flywheel = 1/2 m R²
= .5 x 1500 x .6²
= 270 kg m²
If required angular velocity be ω
rotational kinetic energy = 1/2 I ω²
= .5 x 270 x ω² = 135 ω²
kinetic energy of bus when its velocity is 20 m/s
= 1/2 x 10000 x 20²
= 2000000 J
Given 90 % of rotational kinetic energy is converted into bus's kinetic energy
135 ω² x 0.9 = 2000000 J
ω²=16461
ω = 128.3 radian /s
b )
Let the height required be h .
Total energy of bus at the top of hill = mgh + 1/2 m v²
m ( gh + .5 v²)
= 10000 ( 9.8h + .5 x 3²)
From conservation of mechanical energy theorem
10000 ( 9.8h + .5 x 3²) = 2000000
9.8h + .5 x 3² = 200
9.8h = 195.5
h = 19.95 m .
True or false. There is only an induced voltage in a coil of wire if the magnetic flux through the coil of wire changes.
A solenoid coil 10cm long has 40 turns cm-1. The current rises from zero to its maximum value of 5.0000 A and 0000.01s when the switch is closed. Find the energy stored in magnetic field if the area of cross section of solenoid be 28 centimeter square.
Answer:
Explanation:
Energy stored in a solenoid per unit volume = B₀² / (2μ₀)
B₀= μ₀ n I₀
n is no of turns per unit length .
Energy stored in a solenoid per unit volume = ( μ₀ n I₀)² / (2μ₀)
=μ₀n²I₀²/2
n = 40 turns / cm = 40 x 100 turns per meter.
I₀ = 5000A .
Putting the values
Energy stored in a solenoid per unit volume
= 4π x 10⁻⁷ x 40 x 10² x 5000² /2
= 1256 J/ m³
Volume of solenoid = cross sectional area x length
= 28 x 10⁻⁴ x .10 = 2.8 x 10⁻⁴ m³
Total energy stored = 1256 J / m³ x 2.8 x 10⁻⁴ m³
= .35 J .
Explain the effects of expansion of water on aquatic life
Answer:
The anomalous expansion of water helps preserve aquatic life during very cold weather. When temperature falls, the top layer of water in a pond contracts, becomes denser and sinks to the bottom. If the temperature falls further, the top layer expands and remains on the top till it freezes.
3. What does an object at rest and an object moving at constant velocity have in common?
Do planets revolve slower or faster the closer they are from the sun?
Answer:
The speed at which a planet orbits the Sun changes depending upon how far it is from the Sun. When a planet is closer to the Sun the Sun’s gravitational pull is stronger, so the planet moves faster. When a planet is further away from the sun the Sun’s gravitational pull is weaker, so the planet moves slower in its orbit.
