Which of the following describes a transfer of energy through work?
A student carries a heavy backpack one km
O A laboratory burner is used to heat 250 ml of water to boiling,
O A woman pushes a luggage cart in an airport over a distance of 100 m
O A man pushes on a large piece of furniture for 15 min, but it does not move.
John often sees squiggly lines when he looks at a bright sky or white paper. His doctor says that they are called eye floaters, which are small bits of protein in the fluid that fills the eyeball.
In what part of the eye are eye floaters found?
a) cornea
b) vitreous humor
c) retina
d) convex lens
Answer- It's B, i double checked it on a few websites
The vitreous humor is the eye is eye floaters.
What is vitreous humor?The vitreous body (vitreous meaning "glass-like"; from Latin vitreus 'glassy', from vitrum 'glass', and -eus) is the clear gel that fills the space between the lens and the retina of the eyeball (the vitreous chamber) in humans and other vertebrates. It is often referred to as the vitreous humor (also spelled humour, from Latin meaning liquid) or simply "the vitreous". Vitreous fluid or "liquid vitreous" is the liquid component of the vitreous gel, found after a vitreous detachment. It is not to be confused with the aqueous humor, the other fluid in the eye that is found between the cornea and lens.
StructureThe vitreous humor is a transparent, colorless, gelatinous mass that fills the space in the eye between the lens and the retina. It is surrounded by a layer of collagen called the vitreous membrane (or hyaloid membrane or vitreous cortex) separating it from the rest of the eye. It makes up four-fifths of the volume of the eyeball.The vitreous humour is fluid-like near the centre, and gel-like near the edges.
Learn more about vitreous humor
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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.
a uniform metre scale rests horizontally on a knife edge at the 60cm mark when a mass of 10 gram is suspended from one end . at which end this mass be suspended . what is the mass of meter scale?
Answer:
40 gram or 0.04 kilogram
Explanation:
From the diagram attached,
The mass must be suspended at end B.
Applying the principle of moment,
Sum of clockwise moment = sum of anti-clockwise moment.
From the diagram,
Taking the moment about the pivot,
X(60-50) = 0.1(100-60)
Where X = weigth of the meter rule
10X = 4
X = 4/10
X = 0.4 N
X = 0.4/10
X = 0.04 kg
X = 40 g
Hence the mass of the meter rule = 0.04 kg or 40 gram
A car has wheels of radius of 0.380 m and they rotate once every 0.100 s. What is the linear velocity of the wheels? (Units = m/s)
Answer:
v = 23.87 m/s
Explanation:
Given that,
The radius of wheels, r = 0.380 m
The wheels rotate once every 0.1 s
We need to find the linear velocity of the wheels. The linear velocity of a wheel is given by :
[tex]v=\dfrac{2\pi r}{t}\\\\=\dfrac{2\pi \times 0.38}{0.1}\\\\=23.87\ m/s[/tex]
So, the required linear velocity of the wheel is equal to 23.87 m/s.
help.....please science
Answer:
please mark me brainliest
Explanation:
ohm
The SI-derived unit of electric resistance is the ohm, which is defined as a volt per ampere.
Answer:
I cant see that
A lens with f=15.0 cm is held 29.0 cm from an object. Where does the image form
Answer:
Magnification, m = 3
Explanation:
It is given that,
Focal length of the lens, f = 15 cm
Object distance, u = -10 cm
Lens formula :
v is image distance
Magnification,
So, the magnification of the lens is 3.
Answer:
31.1
Explanation:
Trust brother
Write your views on pyramid.
=> No copy Paste
=> Conspiracy theories are accepted
Answer:
pyramid is a body or structure whose outer surfaces are triangular and converge to a first step at the the top which base may be in a shape of triangle ,rectangle,square and other any shape.
Explanation:
its volume is equal to product of area of base and height of it..
the lateral surface area of a regular pyramid is equal to the sum of the areas of its lateral faces.
the total surface area of a regular pyramid is equal to the sum of the lateral surface areas of pyramid and base.
Answer:
A pyramid is a polyhedron for which the base is a polygon and all lateral faces are triangles. A pyramid is described by the shape of its base . for example , a triangular pyramid has a triangular base , square pyramid has a square base .hope it is helpful to you
A truck gradually starts off from rest with a uniform
acceleration of 2 m/s2
. It reaches a velocity of 16 m/s. Using the
equation
[tex] {v}^{2}={u }^{2}+2as[/tex]
,calculate the distance it travels while it is
accelerating
An object on the moon feels lighter than the same object on earth. which statement explains this phenomenon?
A. The moon has less mass than earth.
B. The object has a greater gravitational attraction to the moon.
C. The object has less mass on the moon then on earth.
D. The moon is in orbit around earth.
Answer:
B
Explanation:
cause
Answer: A
Explanation:
The moon has less mass than Earth.
Just took the test.
Dr. Kirwan is preparing a slide show that he will present to the executive board at tonight's committee meeting. He places a 3.50-cm slide behind a lens of 20.0 cm focal length in the slide projector. A) How far from the lens should the slide be placed in order to shine on a screen 6.00 m away? B) How wide must the screen be to accommodate the projected image?
Answer:
A) d_o = 20.7 cm
B) h_i = 1.014 m
Explanation:
A) To solve this, we will use the lens equation formula;
1/f = 1/d_o + 1/d_i
Where;
f is focal Length = 20 cm = 0.2
d_o is object distance
d_i is image distance = 6m
1/0.2 = 1/d_o + 1/6
1/d_o = 1/0.2 - 1/6
1/d_o = 4.8333
d_o = 1/4.8333
d_o = 0.207 m
d_o = 20.7 cm
B) to solve this, we will use the magnification equation;
M = h_i/h_o = d_i/d_o
Where;
h_o = 3.5 cm = 0.035 m
d_i = 6 m
d_o = 20.7 cm = 0.207 m
Thus;
h_i = (6/0.207) × 0.035
h_i = 1.014 m
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.
the pulley is a uniform disk with a mass of 0.75 kg and a radius of 6.5
on between the 5.8 kg mass and the horizontal surface is 0.25, and the
The system is released from rest. Use work-energy principles to deter
2.8 kg mass and (b) the pulley after the 5.8 kg mass has moved 2.2 m
Answer:
please find the answer in the attached images , in 2 parts, btw thanks for so many points. i hope my answers are correct.
An ecosystem is a group of organisms and the habitat in which they live together. All organisms in an ecosystem interact with each other and their environment.
Some organisms interact as part of a food chain or food web. A food web is a complicated set of interrelated food chains all found in one ecosystem. Matter and energy are transferred from one organism to another at each step. They go through the producers like plants, which make their own food, consumers like animals, which eat other living things, and decomposers like bacteria, which break down dead organisms and help cycle energy and nutrients back into the environment.
For example, in the hot African Savannah, a herd of antelope gets energy from the grass they eat. A pride of lions chases down and consumes an antelope, gaining energy from the flesh of their prey. One of the lions is very old, and soon dies. Scavengers gain energy as they pick over his dead body. This is just one example of a string of events that is the food chain.
In the food chain described above, what are the producers?
a. the antelope that eat the grass
b. the scavengers that eat the dead lion
c. the grasses the antelope eat
d. the lions that eat the antelope
Answer:
C
Explanation:
producers must be a green plant
Answer: C
Explanation:
Producers, also known as autotrophs, make their own food. They make up the first level of every food chain. Autotrophs are usually plants or one-celled organisms. Nearly all autotrophs use a process called photosynthesis to create “food” (a nutrient called glucose) from sunlight, carbon dioxide, and water.
pls help ASAP i have already failed this test once i cant fail it again
Answer:
Petrochemicals are a set of chemical compounds that fuel a wide array of products across the globe. They are made of hydrocarbons that are separated and extracted from petroleum (crude oil) and natural gas and are at the core of multiple industries, including: Cosmetics. Electronics. Packaging.
Answer:
B. I think Gasoline, natural gas, and diesel fuel
I'm truly sorry if it's wrong :(
Explanation:
A measure of an object's is a measure of the object's inertia.
Answer: Mass is the quantity of matter in an object. More specifically, mass is a measure of the inertia, or “laziness,” that an object exhibits in response to any effort made to start it, stop it, or otherwise change its state of motion. Weight is the force of gravity on an object.
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
A go-cart and rider have a mass of 100 kg. If the cart accelerates at 5 m/s2 during a 25 m sprint, how much work did the cart do
Answer:20watts
Explanation:
Answer:
The solution is given below
Explanation:
The computation is shown below;
We know that
Work done = Fs cosθ
But before that we need to determine the force i.e.
We know that
Force (F) = mass (m) × Acceleration (a)
= 100 × 5
= 500 N
Now, work done by the go-cart is
Work done (W) = Fs cosθ
= 500 × 25 × cos(0°)
= 500 × 25 × 1
= 12,500 J
What is the Deepest point of the ocean and where is it?
Answer:
marinas trench in Pacific Ocean
mark it as brainliestExplanation:
Located in the western Pacific Ocean, the Marina Trench
Choose the correct statement below that accurately describes the shear and normal stresses in a beam. A. Shear stresses are maximum at the neutral axis and normal stresses are maximum furthest from the neutral axis. B. Normal stresses are maximum at the neutral axis and shear stresses are maximum furthest from the neutral axis. C. Shear stresses and normal stresses are maximum at the neutral axis. D. Shear stresses and normal stresses are maximum furthest from the neutral axis.
Answer:
A. Shear stresses are maximum at the neutral axis and normal stresses are maximum furthest from the neutral axis.
Explanation:
Normal stress :
Normal stress is defined as the stress or the restoring force that occurs on the plane when an external axial load is applied on it. For a beam the normal stress is maximum at the point furthest from the neutral axis and is zero at the neutral axis of the beam.
Shear stress :
Shear stress is a stress which occurs when the force acts on the surface of the member in a parallel direction. It changes the shape of the member. For a beam, the shear stress is maximum at the neutral axis.
A 1200 kg car accelerates from rest to 10.0 m/s in a time of 4.50 seconds. Calculate the force that the car’s tires exerted on the road.
please help me i need the answer in 10 mins
Answer:
the force that the car’s tires exerted on the road is 2,666.67 N.
Explanation:
Given;
mass of the car, m = 1,200 kg
initial velocity of the car, u = 0
final velocity of the car, v = 10.0 m/s
time of motion, t = 4.50 s
The force the car’s tires exerted on the road is calculated as follows;
[tex]F = ma= \frac{m(v-u)}{t} \\\\F = \frac{1200(10-0)}{4.5} \\\\F = 2,666.67 \ N[/tex]
Therefore, the force that the car’s tires exerted on the road is 2,666.67 N.
Which way does the weight point in an FBD?
the answer would depend on the motion of the object
down
perpendicular to the surface
up
Answer:
the answer would depend on the motion if the surface
A proton is 0.9 meters away from a 1.4 C charge. What is the magnitude of the electric force between the proton and the charge
Answer:
F = 2.49 x 10⁻⁹ N
Explanation:
The electrostatic force between two charged bodies is given by Colomb's Law:
[tex]F = \frac{kq_1q_2}{r^2}\\[/tex]
where,
F = Electrostatic Force = ?
k = colomb's constant = 9 x 10⁹ N.m²/C²
q₁ = charge on proton = 1.6 x 10⁻¹⁹ C
q₂ = second charge = 1.4 C
r = distace between charges = 0.9 m
Therefore,
[tex]F = \frac{(9\ x\ 10^9\ N.m^2/C^2)(1.6\ x\ 10^{-19}\ C)(1.4\ C)}{(0.9\ m)^2}[/tex]
F = 2.49 x 10⁻⁹ N
31.5N
I have confirmed it is the right answer.
U will be marked as brainlest if you solve this ex
Answer:
.
Explanation:
name them all
then multiply
after it simplify
Doing science by inquiry always involves:
Describe or identify some uses of an electromagnet.
Answer:
Electromagnets are widely used as components of other electrical devices, such as motors, generators, electromechanical solenoids, relays, loudspeakers, hard disks, MRI machines, scientific instruments, and magnetic separation equipment.Explanation:
A cannon and a supply of cannonballs are in a sealed system railroad car. The car has a length of 20 meters, and a mass of 2000kg. The cannon fires to the right, the car recoils to the left. Fired cannonballs remain in the car after hitting the wall and land on the floor at the end of the car. The cannonballs have a mass of 15 kg each, and there are ten of them. (neglect mass of cannon) How far will the car move after all ten have been fired
Answer:
The distance the car moves after all ten cannonballs have been fired is 1.5 meters
Explanation:
The parameters given in the question are;
The length of the car = 20 meters
The mass of the of the cannon ball, m₁ = 2,000 kg
The direction the cannon fires = The right
The direction the car recoils = The left
The mass of each cannonball, m₂ = 15 kg
The number of cannonballs = 10
Let v₁ represent the speed of the car and let v₂ represent the speed of the cannonball, where momentum is conserved, we have;
m₁·v₁ = m₂·v₂
2000 × v₁ = 15 × v₂
400·v₁ = 3·v₂
Therefore, when the cannon ball travels 400 meters, the railroad car travels 3 meters
Similarly, when the cannon ball travels 400/20 = 20 meters, the distance the railroad car travels, d = 3/20 meters
We not that the railroad car and the car are brought to a stop each time the cannonball hits the watt
Therefore, the total distance moved by the car after all ten have been fired, [tex]d_{total}[/tex], is given as follows;
[tex]d_{total}[/tex] = d × The number of balls fired
∴ [tex]d_{total}[/tex] = 3/20 meters per ball × 10 balls = 3/2 meters = 1.5 meters
The total distance moved by the car, [tex]d_{total}[/tex] = How far the car moves after all ten have been fired = 1.5 meters.
Describe in brief the importance of measurement in our daily life?
Measurement tools make our lives safer and better? And they increase the quality and quantity of life. Arguably, the ability to measure calculating
physical properties accurately have tremendous survival value that gives humans adaptive, evolutionary advantages sharpened through many years of natural selection.
You could take magnet and ____ it in half and all the pieces would have ____ and ____ ______ .
You could take a magnet and break it into pieces and all of the pieces would have north and south poles.
4) Explain which electric charges attract and which electric charges repel (push away)
Explanation:
According to the fundamental law of electrostatics, like charges which are ( only positive or only negative charges) repel while unlike charges which are ( positive and negative charges ) attract each other.
that is: ( +++++ ++++++) they repel
while ( +++++++ ———) they attract