Answer:
What kinds of microorganisms were found on the pillow and what kinds of allergy symptoms were caused by these microorganisms?
which statement describes how adding oil effects the mechanical efficiency of a car's engine?
Answer:
Mechanical efficiency accounts for losses due to engine friction and ancillaries such as the lubricant pump, coolant pump, fuel pump and cooling fan. Engine friction arises whenever there is relative motion between parts. Journal bearings on the crankshaft, connecting rods and camshaft as well as piston rings and piston skirts are important sources
Explanation:
An astronomer writes down the following for an object in the night sky: azimuth 364˚ and altitude 93˚, what is wrong with the values?
If your azimuth is larger than 180 degrees, multiplying it by 180 degrees to find your rear azimuth will result in an azimuth that is greater than 360 degrees.
What azimuth 364˚, altitude 93˚, what is wrong with values?A circle has 360 degrees, thus if your azimuth is higher than 180 degrees, multiplying it by 180 degrees to find your back azimuth will result in an azimuth higher than 360 degrees.
Because many ancient calendars had 360 days, it may be because the stars appeared to rotate around the north star at a rate of around 1 degree every day that azimuth is measured using a 0-360° interval. Azimuth is utilized outside of astronomy in disciplines like navigation and geology.
Therefore, Whereas an object at 90 degrees height is directly overhead, one at 0 degrees altitude is just above the horizon.
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What is the density of an object if it has a volume of 162 ml with a mass(273) that is shown in the picture below?
Answer:
1.685185185185185 (you can round to whatever your teacher asks)
Explanation:
Formula for Density
D=m/v (Density equals mass over volume)
273/162
(/) means division.
the photo shows a metal spoon just after it is placed in a bowl of hot soup. what will happen over time?
a. the kinetic energy of particles in the spoon will increase as thermal energy moves from the soup to the spoon
b. the kinetic energy of particles in the soup will increase as thermal energy moves from the spoon to the soup
c. the kinetic energy of particles in the spoon will decrease as thermal energy moves from the soup to the spoon
d. the kinetic energy of particles in the spoon will decrease as thermal energy moves from the spoon to the soup
What would happen to the digestion process if enzymes were not present
Answer: It would take 2.3 billion years for the biological reaction without the presence of enzymes. It’s because, without them, your body can’t break down foods so that nutrients can be fully absorbed. Every organ, every tissue, and every 100 trillion cells in our body rely upon the reaction of metabolic enzymes and their energy component.
Explanation:
I hope this helps
Which effect is created when two sound waves that are close in pitch
interact?
O A. Echoes
O B. Loudness
C. Beats
O D. Intensity
Answer:
C. Beats
Explanation:
When waves are interfering with each other, the sound is louder in some places and softer in others. As a result, we hear pulses or beats in the sound.
Answer:
beats
Explanation:
got it right
Help me please, ;) I could use it
Answer:
The solution(s) are in order with respect to the attachments
\(2.613\:\cdot10^5\) Joules ; 5. Adding the same amount of heat to two different objects will produce the same increase in temperature ; 2. Same speed in both ; 2. A
Explanation:
Diagram 1 ( Liquid Nitrogen ) : So as you can see, we want our units in Joules here, and can therefore multiply the mass of gaseous nitrogen and the latent heat of liquid nitrogen, to cancel the units kg, and receive our solution - in terms of Joules. Let's do it.
q ( energy removed ) = mass of nitrogen \(*\) latent heat of liquid nitrogen,
q = 1.3 kg \(*\) 2.01 \(*\) 10⁵ J / kg = \(1.3\:\cdot \:2.01\:\cdot \:\:10^5\) = \(10^5\cdot \:2.613\) = \(100000\cdot \:2.613\) = \(261300\) Joules = \(261.3\) kiloJoules = 2.613 \(*\) 10⁵Joules is the energy that must be removed
Diagram 2 : The same amount of heat does not necessarily mean the same increase in temperature for two different objects. The increase in temperature depends on the specific heat capacity of the substance. Therefore your solution is 5 ) Adding the same amount of heat to two different objects will produce the same increase in temperature.
Diagram 3 : The temperatures in both glasses are the same, and hence the molecules have the same average speed. Therefore your solution is 2 ) Same speed in both.
Diagram 4 : Glass A has more water molecules, and hence has more thermal energy. Your solution is 2 ) A.
A skydiver dives from an airplane. Air resistance is measured each second following the skydiver’s jump. Which statement BEST identifies the skydiver’s speed at each second?
PLS HELP QUICK
Answer: (B) 4 Seconds
Explanation: The Balance of weight and air resistance equals out after 4 seconds giving you your terminal velocity. (the fastest speed you can travel at your given weight and air resistance)
Answer : B. The sjydriver has the fastest speed at 4second.
What is air resistances ?
--Air resistance is a type of friction force.
-- Air resistance, there are not two solid surfaces in contact.
-- Air resistance is the frictional force acting on an object and the air around them.
--This means that friction always pushes in the opposite direction than the skydiver is travelling, therefore slowing the skydiver down.
Concept Used
-- When the skydiver jumps off the plane, their speed would accelerate because the pull of gravity on the person, or their weight force, is greater than the air resistance slowing them down.
-- A person’s weight force will always stay the same.
-- The weight force of the person will equal their air resistance.
-- This would make the skydiver travel at constant speed.
--To travel at constant speed forces have to be equal to zero.
--This constant speed is called terminal velocity
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Compare and contrast intensive and extensive physical properties, and give 3 examples of each.
Answer:
Intensive properties do not depend on the quantity of matter. Examples include density, state of matter, and temperature. Extensive properties do depend on sample size. Examples include volume, mass, and size.Intensive properties do not depend on the quantity of matter. Examples include density, state of matter, and temperature. Extensive properties do depend on sample size. Examples include volume, mass, and size.
Explanation:
how do you ensure electrical safetyat home
make a poster
Regular Electrical Inspections: Schedule periodic inspections of your home's electrical system by a qualified electrician to identify any potential hazards or issues.
Ground Fault Circuit Interrupters (GFCIs): Install GFCIs in areas where water is present, such as kitchens, bathrooms, laundry rooms, and outdoor outlets. GFCIs detect imbalances in electrical currents and quickly cut off power to prevent electric shocks.
Arc Fault Circuit Interrupters (AFCIs): Use AFCIs to protect against arc faults, which can cause electrical fires. AFCIs detect dangerous electrical arcs and shut off power to prevent potential fires.
Electrical Overload Prevention: Avoid overloading electrical outlets by using power strips with built-in circuit breakers. Spread out high-wattage appliances across multiple outlets rather than using adapters or extension cords.
Proper Cord Usage: Inspect electrical cords regularly for damage, fraying, or loose connections. Replace damaged cords immediately. Avoid running cords under carpets or rugs, and don't pinch them behind furniture or doors.
Outlet Safety: Install tamper-resistant outlets to protect children from accidental electrical shocks. Cover unused outlets with safety caps or plugs.
Light Bulb Safety: Use the correct wattage light bulbs for fixtures to prevent overheating. Always turn off the power before changing light bulbs.
Electrical Appliance Safety: Unplug appliances when not in use and during electrical storms to protect them from power surges. Follow manufacturer's instructions for maintenance and usage.
Outdoor Safety: Use weatherproof electrical outlets and cover them with appropriate enclosures. Avoid using electrical tools or appliances in wet conditions unless they are specifically designed for outdoor use.
Education and Awareness: Educate your family members about electrical safety practices, such as not overloading outlets, avoiding water near electrical sources, and recognizing the signs of potential electrical hazards.
Describe what you think the motion of a tennis ball will be if its rolling down an open SPACE!!
PLEASE HELP!!!!
Answer: Kinetic energy
Explanation:
because its moving
1 sentence telling me the topic of the story. In your own words.
3 sentences you copy straight from the magazine with "quotation" marks around it. This sentence proves that the topic is what you stated in the first sentence.
1 sentence telling me the conclusion. In your own words.
3 sentences you copy straight from the magazine with "quotation" marks around it. This sentence proves that the conclusion is what you stated in the sentence above this one
The average woodpecker smashes its beak against a hard surface more than 10,000 times a day. Any human who jolted their head like this would likely end up with a concussion. This traumatic brain injury is caused by a blow to the skull. So why doesn’t the constant hammering turn woodpeckers’ brains into mush? For years, it was assumed that woodpeckers had some kind of cushioning in their heads to protect their brains during pecking. Many scientists suggested that spongy bone in the birds’ skulls absorbed and lessened the shock of each impact (see Myth Buster: Hard Headed). This idea was repeated in scientific articles, textbooks, and informative plaques at zoos. Even though the concept “is often presented like a clear-cut fact, there haven’t been any real tests to prove it,” says Sam Van Wassenbergh. He’s a biologist who studies biomechanics, or how living things move, at the University of Antwerp in Belgium.SHOCK ABSORBER: Van Wassenbergh uses a spring-loaded hammer to show why a shock-absorbing skull would make a woodpecker less efficient at pecking. When you think about it, says Van Wassenbergh, the shock-absorbing skull idea doesn’t make much sense. Woodpecker drills into the wood in search of insects to eat. When the bird’s head accelerates forward, the movement generates kinetic energy. This energy of motion is transferred to the tree when the bird slams its beak against the trunk. If a woodpecker’s skull had to cushion, it would absorb some of this energy and decrease the force of the peck. Why would a bird that survives by pecking evolve to do it less effectively? Van Wassenbergh and his team decided to see what was really going on. First, the researchers recorded videos of woodpeckers’ heads in motion. To capture this rapid movement, the scientists needed special high-speed cameras. Each peck lasts only a fraction of a second! Van Wassenbergh’s team recorded videos of six woodpeckers from three species and analyzed the footage. The researchers used a computer to track three points on each bird’s head: one on the skull and two on the beak. The scientists hypothesized that if the birds’ skulls had shock absorbers, the footage would show a “squishing” of the space between the skull and beak—like when a spring compresses. But that didn’t happen. Instead, the birds’ heads moved as one stiff unit, like a hammer. Next, the team wanted to demonstrate why this adaptation would be helpful to the birds. Using computer models, the scientists simulated woodpecker skulls with and without shock absorbers. Then the researchers compared the force of the pecks. “The pecking performance was greatly reduced in the skull with a shock absorber,” says Maja Mielke, a biologist who worked on the study. With shock absorbers, says Mielke, “the poor birds would need to pound even harder to reach the same results.” For a woodpecker, having a shock-absorbing skull would simply be a waste of energy. Science World originally published this diagram in our May 10, 2021, issue. It was based on scientists’ beliefs about woodpecker anatomy at the time. Here it is again—updated based on new research. MYTH: The skull is made of spongy bone that cushions and protects the brain from impactBUSTED! The skull is hard enough to protect the bird from injury, but it doesn’t cushion The eyes have a special membrane that protects them from flying splinters and wood dust.MYTH: Neck muscles are strong and stiff enough to absorb the shock of each peck BUSTED! Stiff neck muscles do not absorb shock—in fact, they help increase the force of each peck.MYTH: The tongue wraps completely around the outside of the skull, providing an additional level of cushioning, and can extend to probe for food inside holes made by the birdBUSTED! The tongue does not provide any observable cushioning. The beak is connected to the skull with thick bone that prevents jolts and vibrations. NEW RESEARCH SHOWS: The woodpecker’s brain is small, which helps prevent concussions that might occur in a larger animal. If woodpeckers’ skulls don’t absorb shock, then why doesn’t constant pecking damage the birds’ brains? To answer this question, the researchers calculated how harmful the blows from pecking actually are. It turns out the hits aren’t that dangerous because the birds’ brains are so small. “Small masses can tolerate stronger impact forces without being damaged,” says Mielke.
Answer:
The topic of the story is about how woodpeckers can peck without causing damage to their brains.
"The average woodpecker smashes its beak against a hard surface more than 10,000 times a day."
"This traumatic brain injury is caused by a blow to the skull."
"So why doesn’t the constant hammering turn woodpeckers’ brains into mush?"
The conclusion of the story is that woodpeckers don't get brain damage from pecking because their brains are small, which allows them to handle the force of the pecks.
"Small masses can tolerate stronger impact forces without being damaged,"
"The hits aren’t that dangerous because the birds’ brains are so small."
"To answer this question, the researchers calculated how harmful the blows from pecking actually are."
Explanation:
How does the agricultural activity most likely affect the surface water of the area?
Answer:
Agriculture has been the cause of significant modification of landscapes throughout the world. Tillage of land changes the infiltration and runoff characteristics of the land surface, which affects recharge to ground water, delivery of water and sediment to surface-water bodies, and evapotranspiration.
Explanation:
What would be the kinetic energy of a 2 kg bowling ball moving 2m/s? KE = 1/2 mass x velocity x velocity
8 J
4 J
2 J
Energy that comes from the sun—solar energy—is clean. It does not cause pollution the way energy from fossil fuels (like gas and oil) does. However, solar energy must be collected before it can be used. The instruments used to collect solar energy are quite costly.
This paragraph states that solar energy ________.
A) causes a lot of pollution
B) is expensive to collect
C) is one kind of fossil fuel
D) is a cheap way to get energy
Forced is measured by...
Group of answer choices
A. Power
B. Newtons
C. All of the above
D. Kelleys
I need 2 examples for each one of Newton's 3 Laws
Answer:
1. An object in motion will stay in motion: A car, and its breaks.
2. Force = mass x acceleration: Kicking a ball.
3. Equal or Opposite reaction: Tugging on your dogs leash as hes trying to run off.
Explanation:
A meteor falls toward Earth's surface. Given that the acceleration due to
gravity is 9.8 m/s^2, what is the meteor's potential energy if it has a mass of 10
kg at an altitude of 400 m?
O A. 408 J
O B. 7,840,000 J
O C. 2J
O D. 39,200 J
Answer:
39,200J
Explanation:
just took the test
The meteor's potential energy if it has a mass of 10kg at an altitude of 400 m will be 39200 J
What is potential energy ?Potential Energy that depend upon the relative position of various parts of system . It is an energy possessed by an object by virtue of its position or configuration.
mass(m) = 10kg
g (acceleration due to gravity) = 9.8m/s^2
altitude(height (h)) = 400m
Meteor's Potential energy = m * g * h
= 10 * 9.8 * 400 = 39200 J
correct option will be a) 39200 J
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The average power of a wind turbine is 3 MW.
One house consumes an average of 16,000 kW.h per year.
1. Express in joules (j) the average annual energy consumed by this dwelling.
2. Find the number of homes that can be powered by a wind turbine.
Hint: 1 MW = 106 W
Answer:
a
Explanation:
A __ is the starting point from which you describe an objects velocity
Answer: Reference point
Explanation: A reference point is a starting point
For this assignment, you will research how to design and build a solar cooker. Search reliable online sites
for “solar cookers.” After getting the materials you need from your teacher, you will present your initial
design as a drawing or illustration. You will then build your device and test its efficiency by warming up a
hot dog until it reaches an internal temperature of 165°F, recording how long it took you to reach this
temperature. Based on your tests, you will make recommendations on how to improve the design of your
solar cooker, and then present your final design and the logic that supports it in a lab report. Your lab
report should include a title, a list of materials that you used to build your solar cooker, a drawing of your
initial design, observations from your experimental tests, recommendations for a final design based on
what you know about radiation, a drawing of your final design, and the results of the efficiency test. To
help you write your lab report, there is a Student Worksheet on the last few pages of this document.
Answer:
Ideas for Prototype Design
Similar to a cardboard oven just smaller and solar powered
Preliminary Sketches (attach separate paper, if needed)
Option A: i gave the picture
Advantages: Disadvantages:
the tin foil will attract the sun if theres enough heat for the food to warm up
the plastic will keep bugs and/or animal away from getting it it might take longer
the box gives the food something to be in instead of the ground
Option B: i think im going to stay with my original plan i can always make changesMore advantages and disadvantges
Advantages: Disadvantages:
reducing my carbon footprint by alot heat varies so the food my take really really long
using no energy other than the sun.
Which item produces the magnetic field in the electromagnet?
The magnet produces a magnetic field. Item A makes the magnetic field in the electromagnet.
Explanation:
Item A is called a magnet. It has a North pole and a South pole. The electrons move from the North to the south poles, creating a magnetic force.
This Magnetic field creates a magnetic field around a magnet.
Answer: D
Explanation: it is made of metal which attracts the magnetic force field
Question 1 (3 points)
Which is an example of gravitational potential energy only?
Question 1 options:
An elevator moving up to the 3rd floor.
A skateboard rolling down a hill.
A puppy walking in circles under a tree.
An apple resting on the teacher's desk.
Question 2 (3 points)
How can you increase the gravitational potential energy (GPE) of an empty shoe box on the middle shelf of a bookcase?
Question 2 options:
Add items to the box to increase its mass.
Add items to the box and raise it to a higher shelf.
All options listed here will increase the GPE.
Raise the box to a higher shelf.
Question 3 (3 points)
Imagine two young children waiting to go down a slide. The first child goes down and then stays sitting at the bottom of the slide. If there is no friction involved and all of the mechanical energy is conserved what would happen to energy of the second child from the top to the bottom of the slide?
Question 3 options:
The energy is destroyed
Kinetic energy would turn into potential energy at the bottom.
All energy stays the same, it does not change
Potential energy from the top of the slide would turn to kinetic energy as they slide down. Then the kinetic energy of the child coming down the slide will be given to their sibling if they collide at the bottom.
Question 4 (3 points)
A 2-kg bowling ball sits on top of a building that is 40 meters tall. It falls toward the ground. Think about the amount of kinetic energy the bowling ball has as it falls. When would the ball have the most kinetic energy?
Question 4 options:
After it hits the ground and is no longer moving.
Just before it hits the ground and has reached a speed of 28 meters per second.
As it sits on top of the building
When it is half way between the top of the building and the ground, and has reached a speed of 19.8 meters per second.
Question 5 (3 points)
Changing which factor would NOT have an influence on the kinetic energy of a moving shopping cart?
Question 5 options:
Decreasing the mass or speed of the shopping cart.
Increasing the rate of speed you are pushing the shopping cart.
Increasing the mass of the cart by adding items.
Turning a different direction while moving the same speed.
Question 6 (3 points)
Which is an example of an object increasing its kinetic energy?
Question 6 options:
A jogger going faster after spotting a mountain lion behind him on the trail.
A rocket resting in the docking claps just before the launch sequence begins.
A train that has come to a complete stop so passengers can board the train.
An airplane after parking at the gate on the runway.
Question 7 (3 points)
In lesson 4.08, the skateboarder in the halfpipe and the pendulum animations provided a graphic illustration for how PE and KE changed. Why did the bar for the total energy remain constant?
Question 7 options:
Because energy is converted from KE to PE and PE to KE, but the total amount of energy is conserved.
Because these models do not take friction or air resistance into account.
All answers given are correct
Because no energy is being created or destroyed in this system.
Question 8 (3 points)
When is your kinetic energy the least when swinging on a park swing?
Question 8 options:
When at the lowest point or the bottom of the swinging path.
When halfway between the highest point of the swinging path and the bottom or lowest point in the path.
At the top of the swinging path, when you are still for a moment just before falling again.
When moving past the bottom of the path and going back up to the highest point.
Question 9 (3 points)
Mechanical energy is defined as
Question 9 options:
Energy of machines and tools
The energy of motion and position, represented by the formula: KE + PE = ME
Potential energy
Energy of motion
Question 10 (3 points)
Conservation of mechanical energy is defined as
Question 10 options:
Energy of motion
Potential energy added to kinetic energy
Law of conservation of energy
The sum of the kinetic and potential energies of an object remain a constant value unless there are forces acting on the object that cause a loss of energy overall, such a friction and air resistance.
Is everything okay? Cuz I dont wanna know the answer lol
Choose all the answers that apply.
Stars:
usually seem bright if they are close to Earth
are terrestrial bodies
use their own matter to create nuclear reactions
generate their own energy
are classified primarily by temperature
Answer:
use their own matter to create nuclear reactions
generate their own energy
are classified primarily by temperature
usually seem bright if they are close to Earth
Explanation:
The answers that apply for the stars are 1,2,4 and 5. Stars usually seem bright if they are close to Earth.
What is a star?A star is a heavenly body made up of a brilliant spheroid of plasma held together by gravity. The Sun is the closest star to Earth.
Many additional stars may be seen with the normal eye at night, but due to their great distance from Earth, they appear as stationary points of light in the sky.
The answers that apply for the stars are as follows;
1. Usually seem bright if they are close to Earth.
2. Stars are terrestrial bodies.
4. They generate their own energy.
5. Stars are classified primarily by temperature.
The answers that apply for the stars are 1,2,4 and 5.
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Use the following scenario to answer the question.
The desk for Caron’s new office weighs 500 Newtons. What would be the impact of an applied force that pushes from below at 475 Newtons?
(1 point)
The desk would move upward.
The desk would move forward.
The desk would change directions.
The desk would stay where it is.
Answer:
The desk would move upwards.
Explanation:
diagram... At which location would the moon most likely be in a FULL MOON phase (all of the lit side visible)? *
A
B
C
D
E
F
Describe 3 factors an engineer should take into consideration when choosing material for building the pipes in a pipeline
Gr. 8
Think it has something to do with Viscosity, Density, and Pressure but not sure what
Answer: 1. Material being transported 2. The temperature of the material being transported 3. How long the pipes will be there (lifespan)
Explanation: 1. - The pipe builder should consider the material being transported to choose the correct material of the pipes to use, so they last long and can hold the material.
2. - Similar to 1, the pipe builder should consider the temperature of the material to choose the correct material of the pipes to use, so the pipes don’t break and function properly.
3. - If the pipe builder uses a material that can hold the material, that’s great! If that material will last a short time, it would not work if the pipes were to be used for a long time.
The things you said before about viscosity, density, and pressure are also correct. The correct answers are mainly talking about factors of the material being used in the pipes.
hope this helped :)
Give an example for each of the following energy conversion:
(1) electrical energy to kinetic energy.
(2) chemical energy to electrical energy
ANSWER:
(1) Electric motors
(2) Batteries
Microwaves have a higher frequency than radio waves, so why is it that they don't travel faster?
Answer: Energy requirement or consumption also increases as frequency goes higher. Hence, those low-frequency to mid-frequency waves are commonly referred to as radio waves and essentially, they have longer wavelengths. On the other hand, microwaves have higher frequencies and shorter wavelengths.
Explanation: therefore that's why they don't travel faster.
Microwaves have a higher frequency than radio waves, but don't travel faster as a result of low wavelength and energy.
What is Wavelength?
This is defined as the distance between corresponding points of two consecutive waves.
Radio waves have a higher wavelength and energy which is why they are able to travel faster and larger distances.
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9. If you have two or more risk factors for a disease, you will get the disease no matter what you do. True False
Answer:
id say false
I might be wrong but ye i think its false
Explanation: