Answer : The pencil appears broken because it bends when it passes through water.
Explanation :
When a student placed a pencil in a cup of water, the pencil appears broken. This is due to the refraction of light.
The bending of light when it moves from one medium to another is called refraction of light. When the light travels from denser to rarer medium, it gets bends away from the normal.
While when the light travels from rarer to a denser medium, it moves towards the normal.
So, the correct option is " bends when it passes through water ".
Russian ice skater, Alina Zagitova, spins her way to projected Gold in the 2018 Olympics.
During one particular spin, she moves from a camel spin that rotates at about 95. RPM to a tight spin. If her rotational inertia changes from 129kgm² to 32kgm², what is the final spin rate of Miss Zagitova in rad/s and RPM
HELP PLS! AND MAKE SURE YOU ARE CORRECT ON ALL OF THEM DUE TOMORROW
Question 2
Which layer of the atmosphere has the most air pressure?
exosphere
stratosphere
troposphere
mesosphere
Question 3
Which best explains heating by convection?
Air molecules touch the warm ground, heating them up.
Warm air rises and takes heat with it; eventually it cools and sinks.
Sunlight travels through space without the aid of fluids or solids.
Land and ocean absorb and re-emit heat from the sun.
Question 7
Which conditions are usually the effect of a low air pressure system?
clear, dry weather
cloudy, wet weather
cold, dry weather
hot, dry weather
Question 8
What would cause rain showers to continue over a particular area for several days?
a high-pressure system
a stationary front
low humidity
a warm front
Question 9
What effect does an ocean have on the climate?
Rushing water from tides lead to dry air.
There is no influence on climate from an ocean.
Cool ocean air causes a cool climate.
Warm ocean air causes a dry climate.
A ball is dropped and falls with an acceleration of 9.8 m/s2 downward. It hits the ground with a velocity of 49 m/s downward. How long did it take the ball to fall to the ground?
It would take the ball 5 seconds to fall to the ground.
Given the following data:
Acceleration = 9.8 [tex]m/s^2[/tex]Final velocity = 49 m/s.Initial velocity = 0 m/s (since the ball is starting from rest).To find how long (time) it took the ball to fall to the ground, we would use the first equation of motion;
Mathematically, the first equation of motion is calculated by using the formula;
[tex]V = U + at[/tex]
Where:
A is the acceleration. V is the final velocity. U is the initial velocity. t is the time measured in seconds.Substituting the given parameters into the formula, we have;
[tex]49 = 0 + 9.8t\\\\49 = 9.8t\\\\t = \frac{49}{9.8}[/tex]
Time, t = 5 seconds.
Therefore, it would take the ball 5 seconds to fall to the ground.
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Which statement best describes what Kendall can do? She can measure the volume and mass of the marble, the volume and mass of the water, and the volume and mass of the graduated cylinder. She can measure the volume and mass of the marble, the volume and mass of the water, and the mass of the graduated cylinder. She can measure the volume of the marble and water, and the mass of the graduated cylinder. She can measure the mass of the marble and water, and the volume of the graduated cylinder
Answer: its b
She can measure the volume and mass of the marble, the volume and mass of the water, and the mass of the graduated cylinder.
Explanation:
i got it wrong it is b not A
Kendall can measure the volume and mass of the marble, the volume and mass of the water, and the mass of the graduated cylinder, therefore the correct answer is option B
What is the matter?Anything which has mass and occupies space is known as matter, mainly there are four states of matter solid liquid gases, and plasma.
These different states of matter have different characteristics according to which they vary their volume and shape.
As per the given problem The statement that can best describes what Kendall can do is that She can measure the volume and mass of the marble, the volume and mass of the water, and the mass of the graduated cylinder
The right response is option B since Kendall can measure the volume and mass of the marble, the volume and mass of the water, and the mass of the graduated cylinder.
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Light traveling through air strikes the surface of the four different materials below. which material reflects light but doesn't refract it?
Options:
A-Metal Spoon
B-Water Droplets
C-Diamond
D-Prism
Cart A of inertia m has attached to its front end a device that explodes when it hits anything, releasing a quantity of energy E. This cart is moving to the right with speed v when it collides head-on with cart B of inertia 2m traveling to the left at the same speed v. The explosive goes off when the carts hit, causing them to rebound from each other. The initial direction of motion of cart A (to the right) is the +x direction.
Part A
If one-quarter of the explosive energy is dissipated into the incoherent energy of noise and deformation of the carts, what is the final velocity of cart A?
Express your answer in terms of the variables E, v, and m.
Part B
If one-quarter of the explosive energy is dissipated into the incoherent energy of noise and deformation of the carts, what is the final velocity of cart B?
Express your answer in terms of the variables E, v, and m.
HURRY PLEASE
When using a calorimeter, the initial temperature of a metal is 70.4C. The initial temperature of the water is 23.6C. At the end of the experiment, the final equilibrium temperature of the water is 29.8C. What is the final temperature of the metal? ____ C What is the temperature change of the water? ____ C What is the temperature change of the metal? ____ C
temperature of a metal is29.8
temp. of water is 6.2
temp. change of metal -40.6
Answer:
The final temperature of metal is [tex]29.8\degree \,\mathrm C[/tex].
The temperature change of water is [tex]6.2 \degree \, \mathrm C[/tex]
The temperature change of the metal [tex]-40.6 \degree \, \mathrm C[/tex]
Explanation:
The term equilibrium means initial temperature and final temperature will be same. Thus, the the temperature of the water at thermal equilibrium, the final temperature of the metal must be the same [tex]29.8\degree \,\mathrm C[/tex].
Find the temperature change of water.
[tex]\mathrm {Change \, of\, temperature} =\mathrm{ Final\, temperature} - \mathrm {Initial\, Temperature}\\=29.8\,\mathrm C-23.6\,\mathrm C\\=6.2\,\mathrm C[/tex]
Find the temperature change of metal.
[tex]\mathrm {Change \, of\, temperature} =\mathrm{ Final\, temperature} - \mathrm {Initial\, Temperature}\\=29.8\,\mathrm C-70.4\,\mathrm C\\=-40.6\,\mathrm C[/tex]
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How do tests with crash dummies, seat belts, and air bags illustrate newton’s First law of motion
Answer:
Newton law of inertia.
Explanation:
Newton first law states that if any object is in the motion or is in the state of rest then it will remain in that state till the external force is applied on that object. Inertia is the main reason of having seat belts and air bags in the car.
In this case, when seat belt trapped into the passenger than passenger experience same state of motion as car has.
When the car experience any kind of the collision then the car will stop abruptly. In this case seat belt and air bag will help in stopping the motion of passenger in the forward direction.
Therefore Newton's law of inertia is illustrated in test with seat belts, crash dummies, and air bags.
Which model represents a fraction greater than 3/5
To represent a fraction greater than 3/5, choose a numerator larger than 3 and match it with a denominator. Fractions like 4/6, 5/7, or 10/12 are examples of fractions greater than 3/5.
Fractions greater than 3/5 are represented by fractions where the numerator is larger than the denominator. For example, 4/6 is greater than 3/5 because the numerator 4 is greater than the denominator 6.
To find a fraction larger than 3/5, you can choose any numerator larger than 3 and pair it with a denominator to form a fraction greater than 3/5, such as 4/6, 5/7, or 10/12.
An airplane is accelerating forward due to a force of 3320 newtons acting 30 on it. Then it encounters wind resistance that exerts a backward force of 550 newtons. What is the net force, in newtons, acting on the airplane?
please help
Sun warms up earth by
Which landform represents the boundary between the land and an ocean or a lake?
Answer:
coastline
Explanation:
its the coastline
How does nitrogen from the air get into the bodies of plants and animals?
Nitrogen is fixed from the atmosphere into a usable form for plants by nitrogen-fixing bacteria, which convert N₂ into nitrates. Plants absorb these nitrates, which are then passed on to animals when they consume the plants. Soil bacteria play a key role in recycling nitrogen back into the atmosphere.
Explanation:Nitrogen Fixation and the Nitrogen CycleNitrogen from the air gets into the bodies of plants and animals primarily through a process called nitrogen fixation. This is carried out by special bacteria known as nitrogen-fixing bacteria. These bacteria convert nitrogen gas (N₂), which plants cannot use, into a form that plants can absorb and utilize. The most common form is nitrate (NO₃⁻), which plants take in through their roots. Animals then obtain nitrogen by consuming plants or other animals that have eaten plants. After the nitrogen has been utilized by living organisms, bacteria in the soil convert waste products and dead organisms back into nitrogen gas through a process called denitrification, completing the nitrogen cycle.
There are different types of nitrogen-fixing bacteria, some live freely in the soil, while others form symbiotic relationships with the roots of certain plants, such as legumes. Cyanobacteria and Rhizobium are notable members of the nitrogen-fixing bacteria group. Additionally, lightning can also transform atmospheric nitrogen into nitrate, providing another source for the nitrogen cycle.
The tuning fork is producing a wave that contains compressions and rarefactions. It is a ________ wave.
A) compaction
B) transverse
C) latitudinal
D) longitudinal
Answer:
D)
Explanation:
If a bar of copper is brought near a magnet, the copper bar will be
Pennfoster:
A. attracted by the magnet.
B. unaffected by the magnet.
C. repelled by the magnet.
D. made into an induced magnet.
Answer: Option B
Explanation: Copper is a non-ferrous material (like aluminuim for example), and the only materials affected by a magnet (or a magnetic field) are the ferrous ones, so the correct answer will be the option B, the copper will be unaffected by the magnet.
Which of the following is a process that occurs at divergent boundaries?
-----------
1. Formation of continental crust
-
2. Magnetic Reversals
-
3. Recycling of Crustals Material
-
4. Formation of Mid-Ocean Ridges
a small 24 kilogram canoe is floating downriver at a speed of 3 m/s.what is the canoe's kinetic energy .
{~please help fast ~}
That all depends who's measuring it.
... If one Physics student is standing on the riverbank, watching the canoe float by, he will measure the canoe's kinetic energy and say it's 108 Joules.
... If another Physics student is sitting on another boat, floating on the same river and watching the same canoe, she will say that the canoe has zero kinetic energy.
Both of them are correct.
Explanation :
Mass of the canoe, m = 24 kg
Speed of the canoe, v = 3 m/s
Kinetic energy is said to be possessed due to the motion of the object and it is given as :
[tex]E_k=\dfrac{1}{2}mv^2[/tex]
v is the velocity of the canoe.
[tex]E_k=\dfrac{1}{2}\times 24\ kg\times (3\ m/s)^2[/tex]
[tex]E_k=108\ J[/tex]
So, the kinetic energy of the canoe is 108 J
Hence, this is the required solution.
A student look at ocean waves coming into the beach. An oceanwavd with more energy will
A. Have a greater height
B. Have a greater period
C. Travel toward the beach faster
D. Strike the beach with greater frequency
In the northern hemisphere, are the day lengths greater of less than 12 hours between the winter solstice and the spring equinox?
A machine shovel moves dirt at the rate of 1,100 pounds of dirt 1 foot in 1 second. How many horsepower is this?
The machine shovel that moves 1,100 pounds of dirt 1 foot in 1 second exhibits 2 horsepower, based on the calculation that compares the work done in foot-pounds per second to the standard definition of one horsepower as 550 foot-pounds per second.
To calculate the amount of horsepower exhibited by a shovel machine moving 1,100 pounds of dirt 1 foot in 1 second, we can use the definition of horsepower. By definition, one horsepower is equal to 550 foot-pounds per second. The machine does 1,100 foot-pounds of work per second (since it moves 1,100 pounds over 1 foot in 1 second).
Now, we calculate the horsepower
Power (hp) = Work (foot-pounds per second) / 550
Power (hp) = 1,100 foot-pounds per second / 550
Power (hp) = 2 hp
Thus, the machine shovel operates at 2 horsepower.
The diagram shows light interacting with an object. which object is the light most likely striking?
Answer: a) A window
Explanation:
The answer is a because only a window reflects light like that
a 40 N block exerts 20 Pa of pressure on a table. What is the area of the block that is touching the table?
Maddie and Raul were looking at samples of pond water using the class microscope. They saw some things in the water. They thought the things might be alive, but were not sure. They did a search on-line and found this image. It looked like what they were seeing through the microscope lens. Were the students correct? Explain.
What is the purpose of the three R’s of resource management?
The three R's of resource management stand for reduce, reuse, and recycle. Together, they form a cornerstone philosophy for managing our resources sustainably.
The first R, reduce, emphasizes the importance of cutting back on the amount of waste we produce and reducing our consumption patterns. Reuse encourages us to repurpose items instead of discarding them, thus extending their life cycle and diminishing the need to consume new resources. Lastly, recycle involves processing used materials to create new products, which conserves raw materials and reduces the need for energy-intensive manufacturing processes.
The purpose of the three R's is to: 1. Distribute resources fairly among people, ensuring that resources do not become excessively depleted by overconsumption. 2. Conserve resources so that they are available for future generations without running the risk of depletion. 3. Use resources in ways that do not harm ecosystems, maintaining the delicate balance of our environment.
Effectively applying these principles contributes to the sustainability of rural and regional communities, and ensures that resources are used wisely. This approach helps to transition society from consumerism to conservation, a concept proposed by environmental advocates like the Pollution Probe and governmental advisory boards such as Canada's Science Council in the early 1970s.
In the northern hemisphere, southern winds tend to move to the ________________ because of the earth's rotation.
the answer is D. west. i took it on usa test prep.
In the northern hemisphere, southern winds tend to move to the west because of the earth's rotation.
What is the Coriolis effect?The Coriolis Effect can be described as an apparent effect formed by a rotating frame of reference. The effect takes place when an object moves along a straight path. The Earth which rotates at a fixed speed is the moving frame of reference.
Coriolis force is defined as the perpendicular to the object’s axis. The Coriolis force acts north-south as the Earth spins on its axis from west to east and the Coriolis force is zero at the Equator.
Coriolis force appears to deflect the objects and kind of invisible force. The Coriolis force is calculated by the rate of rotation and mass of the object.
The Coriolis effect generates wind patterns that travel to the east toward the equator and to the west toward the poles near the earth’s surface. These prevailing wind patterns are accountable for moving clouds around the globe and creating weather in different regions.
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A 0.19 F capacitor is desired. What area must the plates have if they are to be separated by a 2.0 mm air gap? a= ?? m^2
Which of the following is likely to contribute to geological events that take place on Earth?
Crust undergoing convective currents
Crust being of uniform thickness throughout
Crust being a single layer that surrounds Earth
Crust sitting on top of molten rock of the mantle
Answer:
Crust sitting on top of molten rock of the mantle
Explanation:
Earth's crust is the geological name for what we usually call the surface of the planet, and it is immediately above the molten rock of the mantle, the next layer of the planet.
The crust happens to be fragmented in large pieces or tectonic plates, that can be seen as "drifting" on the mantle's molten rock, also known as magma.
In some areas tectonic plates are drifting away, allowing magma to reach the surface (volcanoes for example), or the seabed (forming mid-oceans crests).
In other areas tectonic plates are crashing each other, causing earthquakes, tidal waves, mountain formation and other relevant geological events.
The chart above shows how a star's temperature relates to its color. Rigel is a blue star, Betelgeuse is a red star, and the Sun is a yellow star. How do the temperatures of these stars compare?
Answer:
The Sun is hotter than Betelgeuse and cooler than Rigel.
Explanation:
According to the theory of plate to tonics how do two plates interact to form large mountain range
Why is carbon monoxide such as dangerous form of indoor air pollution?