Answer:
The retina is the light sensitive focusing screen. Inside, there's two types of fluid, one watery behind the lens, and further back, a thicker one that helps the eyeball hold its shape.
Answer:
The retina is the light sensitive focusing screen.
hope this helps <3
tìm chỉ số của A1 và A2
Answer:
A1
Explanation:
Hey please could somebody write a speech that i could read out in front of my class about Charles Darwin and the Theory of Evolution. Thank you so much :D
Answer:
Charles Robert Drawin was an English naturalist,Geologist and Biologist, Best known for his contributions to the science of evolution. His proposition that all species of life have descended from common ancestors is now widely accepted and considered a fundamental concept in science!
What is the lowest possible temperature?
a 273 K
b absolute zero
со °C
d 100 °C
Answer:
b- absolute zero
*( And it's called zero kelvin)
The moon is 250,000 miles away. How many feet is it from Earth? (dimensional analysis)
Answer:
1.261 billion
Explanation:The distance between the earth and the moon in miles is 250,000,so in feet,The distance is 1.261 billion
A 105kg astronaut lands on the moon, with a weight of 170N. What is the acceleration due to gravity
Explanation:
given: m= 105kg,f=170N,a=?
F = m×a
a = f/m
a=170/105
therefore, a=1.62m/s^2
Explain the method to measure the external diameter of a sphere
Answer:
The sphere is that the circular objects in the two-dimensional space (1) circle
(2) disk. Two-dimensional space is a set of points and the distance of that point, The two points of Sphere that length and center.
The sphere can be constructed as the name of surface form circle about any diameter. The circle is the special type of the revolution replacing the circle,
the sphere is the distance r is the radius of the ball and the circle is the center of the mathematical ball, as the center and the radius of the sphere is to respectively.
The ball and sphere have not to be maintained mathematical references as solid references. A sphere of any radius is centered at the number of zero.
Explanation: Hope this helps and good luck :)
what is measurment ?
Answer:
Measurement is the act or the process of finding the size, quantity or degree of something.
Explanation:
We can measure the length, weight, and capacity (volume) of any given object.
What efforts are made to bring uniformity in measurement
Answer: The use of S I Unit brings uniformity in measurements.
Explanation:
The S I unit is the international system of units which are used to express the magnitudes or quantities of important natural phenomena. It is used universally as a standard for measurements thereby creating an avenue for uniformity in measurements. The base units that makes up the SI unit are:
--> Length: this is measured in meters (m)
--> Time: this is measured in seconds (s)
--> Mass: this is measured in kilogram (kg)
--> Temperature: this is measured in Kelvin (k)
--> Electric current: this is measured in ampere (A).
--> Amount of substance: this is measured in mole
--> Luminous intensity: this is measured in candela (cd)
These units are used as the standard to make our judgement of measurement more reliable and accurate. And since there is only one basic unit for each quantity (example length which is measured in meters) there is no need for further conversions.
what changes must be done to the wire to increase its conductance.
Answer:
- Decreasing the resistance
- Using a shorter length
- Using a smaller area wire
Explanation:
Formula for conductance in wires is;
G = 1/R
Where;
G is conductance
R is resistance
This means that increasing the resistance leads to a larger denominator and thus a smaller conductance but to decrease the denominator means larger conductance.
Thus, to increase the conductance, we have to decrease the resistance.
Resistance here has a formula of;
R = ρL/A
Where;
ρ is resistivity
L is length of wire
A is area
Thus, to decrease the resistance, we will have to use a shorter length and smaller area of wire.
weight of the body will be more in air water Milk or Mercury
Answer:
Mercury is the answer..
Answer:
I believe mercury
Explanation:
How is the force useful to us?
Answer:
Force is useful to us because it changes or tries to change the positionof a body, it helps to change the direction of a moving object , it helps to change the speedof a moving body etc.
I hope this will help you
why our eyes donot feel cold ?
Answer:
The corneal tissue at the front of the eye has high thermal conductivity so it doesn't stray too far from body temperature even when the ambient temperature is extreme. For example, if the environment is at -11°C, the surface temperature of a human cornea only falls to 28.6°C.
Performance Task 2: "TAKE HOME TASK
1. It took scientist a long time to reconcile the dual nature of light, which led to the idea of the duality of matter. To further see an
evidence of this concept try to observe the smoke coming from a barbeque drill. From a distance, you will see a
wave flow of smoke going up.
Guide Questions:
a. Look closely into it, what do you see?
ha Does your observation tell something about the dual nature of matter? Why? Why not?
2. Observe the colors on the soap bubbles on the surface of water.
Guide Questions:
a. What do you see?
b. What property of light is exhibited?
Pasagot po huhu
A car moving round a circular rest of a car take 120/s to do a lap of 8/km what is the speed in kmlh
Answer:
speed = 240 kilometers per hour
Explanation:
so we know speed = distance over time
speed= 120s
distance= 8km
8km/120s=0.0666km/sec
0.0666km covered in 1 sec
3,600 seconds- 1km/hr
0.0666/1 times 3600= 239.76
239.76= 240km/hr
which best esplains how the body maintains homeostasis.
a. All systems work together to stabilize the body .
b. Each systems work indepently to stabilize the body .
c. All systems works together to match the external environment.
d. Each system works indepently to match the external evironment.
a. all systems work together to stabilize the body
List out the fundamental and derived units
find the acceleration gained by a body in 6 seconds if its initial velocity is 30 meter/seconds and final velocity is 60/seconds meter and spammers stay away
Answer:
Acceleration, a = 5 m/s²
Explanation:
Given the following data;
Initial velocity = 30 m/s
Final velocity = 60 m/s
Time = 6 seconds
To find the acceleration, we would use the first equation of motion;
V = U + at
Where;
V is the final velocity.
U is the initial velocity.
a is the acceleration.
t is the time measured in seconds.
Substituting into the equation, we have;
60 = 30 + a*6
60 - 30 = 6a
30 = 6a
Acceleration, a = 30/6
Acceleration, a = 5 m/s²
2. A student is pulling a 11.0 kg sled along flat ground. The students 30.0 kg sister then sits in the sled. The student then applies a 430 N force at an angle of 35° N of E. If the force of friction is 180 N, what is the acceleration of the sister sitting in the sled. (Ensure you draw a free body diagram.)
Answer:
Explanation:
The equation for this is
F - f = ma
The thing that gets strange here is that, because the student is pulling his sister on the sled with the rope at an angle, some of his efforts are being wasted. The sled is only going to move forward (horizontally), so the vertical component of that force is useless. He's not actually pulling horizontally with that much force; we have to figure out how much using the following equation:
[tex]F=430cos35[/tex] to get that
F = 352 N
Everything else falls into place quite easily into the equation now:
352 - 180 = 41a and
172 = 41a so
a = 4.2 m/s/s
What goals do investigators have when examining a car accident? How do they know how fast a car that was involved in an accident was going?
Answer:
--->The goals of the investigators is to prevent tampering with evidence and reduce exposing workers to additional harm.
--> The investigators are able to find out how fast a car that was involved in an accident was going by measuring the length of skid marks.
Explanation:
Automobile or car accidents are incidents which when it occurs are generally fast, violent and confusing to both the people involved and the eyewitnesses. With the development in technology, investigators (usually known as forensic investigators) use a variety of tools and physical evidence to put together a clear picture of what happened during a car accident. With their discoveries, they would be able to to prevent tampering with evidence and reduce exposing workers to additional harm.
They can know how fast a car that was involved in an accident was going by:
--> Analysing a physical evidence such as measurement of the length of skid marks. When the skid distance (which is the drag factor due to road surface friction) and the braking efficiency are determined, the minimum speed of a car as it started skidding can be estimated. Even the appearance of the skid mark also tells investigators whether a car was braking, accelerating, or sliding.
please give me answer
write any two features of capital
can u guys help me with this question.
State one example of the cause of a short circuit. Explain your answer
Answer:
the positive and negative terminals of a battery are connected with a low resistance conductor.
Calculate the maximum absolute uncertainty for R if:
R = 9A / B
A = 32 +/- 2 seconds
B = 11 +/- 3 seconds
1 second
0.33 seconds
9 seconds
2 seconds
6 seconds
Answer:
ΔR = 9 s
Explanation:
To calculate the propagation of the uncertainty or absolute error, the variation with each parameter must be calculated and the but of the cases must be found, which is done by taking the absolute value
The given expression is R = 2A / B
the uncertainty is ΔR = | [tex]\frac{dR}{dA}[/tex] | ΔA + | [tex]\frac{ dR}{dB}[/tex] | ΔB
we look for the derivatives
[tex]\frac{dR}{dA}[/tex] = 9 / B
[tex]\frac{dR}{dB}[/tex] = 9A ( [tex]- \frac{1}{B^2 }[/tex] )
we substitute
ΔR = [tex]\frac{9}{B}[/tex] ΔA + [tex]\frac{9A}{B^2}[/tex] ΔB
the values are
ΔA = 2 s
ΔB = 3 s
ΔR = [tex]\frac{9}{11}[/tex] 2 + [tex]\frac{9 \ 32}{11^2 }[/tex] 3
ΔR = 1.636 + 7.14
ΔR = 8,776 s
the absolute error must be given with a significant figure
ΔR = 9 s
On the graph of voltage versus current, which line represents a 3.0 resistor
Answer:
C. Line A
Explanation:
V = A*R
12V = 4A*R
R = 12V/4A
R = 3ohms
57. A red ball (m= 10 kg) is moving at 3 m/s. A green ball (m = 8 kg) is moving at 3.5 m/s. Which ball has more
energy and by how much (2)
Answer:
the green ball has 4J more energy
Explanation:
The kinetic energy is given by the formula
K = 0.5 m v^2
the kinetic energy of the red ball:
K(red) = 0.5*10*3^2= 45J
of the green ball:
K(green)=0.5*8*3.5^2 = 49J
therefore the green ball has more energy by 4 Joules
4. Interference is an example of which aspect of electromagnetic radiation?
A) Particle behavior
B) photon behavior
C) the photoelectric effect
D) wave behavior
Answer:
D is the answer wave behavior
Interference, refraction, diffraction, and dispersion are all aspects of wave behavior. (D). That is, particles don't do these things.
Which of the following describes a sound wave?
A. Longitudinal wave that does not require a medium
c
B. Longitudinal wave that requires a medium
C. Transverse wave that does not require a medium
D. Transverse wave that requires a medium
Which statement should he place in the region marked X?
Explanation:
The answer is Electrons move between objects.
A lens has a radius of curvature of magnitude R R on its left surface and a radius of curvature of magnitude 2R 2 R on its right surface. Parallel rays entering the lens from the left are focused to a point 145 mm m m to the right of the right surface.
Answer:
[tex]v=-29cm[/tex]
Explanation:
From the question we are told that:
Radius [tex]R=2f[/tex]
Distance [tex]v=145mm=>14.5cm[/tex]
Generally the equation for is mathematically given by
[tex]\frac{1}{f}=\frac{1}{u}+\frac{1}{v}[/tex]
Therefore
[tex]\frac{1}{f}=\frac{1}{v}[/tex]
[tex]\frac{1}{f}=\frac{1}{14.5}[/tex]
[tex]f=14.5cm[/tex]
Therefore
[tex]R=2f\\\\R=2*14.5[/tex]
[tex]R=29cm[/tex]
Generally the equation for Focal Length of the Right surface is mathematically given by
[tex]f_r=\frac{R_r}{2}[/tex]
[tex]f_r=\frac{2R}{2}[/tex]
[tex]f_r=29cm[/tex]
Therefore
[tex]\frac{1}{29}-\frac{1}{14.5}=\frac{1}{v}[/tex]
[tex]\frac{1}{v}=-\frac{1}{29}cm[/tex]
[tex]v=-29cm[/tex]
In the diagram, q1 = +4.88*10^-8 C.
What is the potential difference when
you go from point A to point B?
Include the correct sign, + or - .
B
0.538 m
1.36 m
91 |
(Hint: Does V go up or down when you go
from B to A?) (Unit = V)
Answer:
ΔV = 1139.3 V = 1.139 KV (+ve sign shows V goes up)
Explanation:
The potential difference while moving from point A to Point B is given as follows:
[tex]\Delta V = V_B-V_A[/tex]
where,
ΔV = potential difference from A to B = ?
[tex]V_A[/tex] = Potential at point A = [tex]\frac{kq}{r_A}[/tex]
[tex]V_B[/tex] = Potential at point B = [tex]\frac{kq}{r_B}[/tex]
Therefore,
[tex]\Delta V = \frac{kq}{r_B}-\frac{kq}{r_A}\\\\\Delta V = kq(\frac{1}{r_B}-\frac{1}{r_A})[/tex]
where,
k = Colomb's Constant = 9 x 10⁹ N.m²/C²
q = magnitude of charge = 4.88 x 10⁻⁸ C
[tex]r_A[/tex] = distance of point A from charge = 1.36 m
[tex]r_B[/tex] = distance of point B from charge = 0.538 m
Therefore,
[tex]\Delta V = (9\ x\ 10^9\ N.m^2/C^2)(4.88\ x\ 10^{-8}\ C)(\frac{1}{0.538\ m}-\frac{1}{1.36\ m})\\\\\Delta V = (439.2 N.m^2/C)(2.59\ /m)[/tex]
ΔV = 1139.3 V = 1.139 KV (+ve sign shows V goes up)
The answer is 492.87.
Correct on Acellus
