It would take 9 minutes and 37 seconds for a 1.51 × 10⁴ Watts steam engine to do 8.72 × 10⁶ J of work.
What is the efficiency of an engine?The efficiency of an Indian can be defined as the ratio of the total useful work done by the engine to the total heat absorbed by the engine.
It can be represented in the form of percentages or in terms of fractions as well.
As given in the problem we have to find out how long it takes a 1.51 × 10⁴ Watts steam engine to do 8.72 × 10⁶ J of work,
Power of the steam engine = work done by the engine/time
=8.72 × 10⁶ / 1.51 × 10⁴
Thus, It would take 9 minutes and 37 seconds for a 1.51 × 10⁴ W steam engine to do 8.72 × 10⁶ J of work.
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if a toaster produces 8 ohms of resistance in a 120 v circuit, what is the amount of current in the circuit
a refrigerator has a power of 90w and is left on for 24 hours. A hair dryer has a power 900w and is on for 20 minutes. which statement correctly compares the energy used by these devices?
The refrigerator uses 7,776,000 J of energy, while the hair dryer uses 1,080,000 J. The correct comparison is C. the refrigerator uses 6,696,000 J more energy than the hair dryer.
To compare the energy used by the refrigerator and the hair dryer, we need to calculate the energy consumption for each device in joules (J).
Step-by-Step Calculation:
Refrigerator:Power = 90 W
Time = 24 hours = 24 × 60 × 60 seconds = 86,400 seconds
Energy used = Power × Time = 90 W × 86,400 s = 7,776,000 J
Hair Dryer:Power = 900 W
Time = 20 minutes = 20 × 60 seconds = 1,200 seconds
Energy used = Power × Time = 900 W × 1,200 s = 1,080,000 J
Now, we compare the two energies:
Energy used by the refrigerator = 7,776,000 J
Energy used by the hair dryer = 1,080,000 J
Difference in Energy Usage:
Difference = 7,776,000 J - 1,080,000 J
Difference = 6,696,000 J
Therefore, the correct statement is:
C. The refrigerator uses 6,696,000 J more than the hair dryer.
complete question:
a refrigerator has a power of 90w and is left on for 24 hours. A hair dryer has a power 900w and is on for 20 minutes. which statement correctly compares the energy used by these devices?
A. The refrigerator uses 1,080,000 J less than the hair dryer.
B. The refrigerator uses 3,224,000 J less than the hair dryer.
C. The refrigerator uses 6,696,000 J more than the hair dryer.
D. The refrigerator uses 7,776,000 J more than the hair dryer.
Julio hit a baseball. What caused the ball to change direction at the time of impact?
a.the force of gravity
b.the speed of the ball
c.the force of his swing
d.the weight of the air
Answer: The force of his swing
Explanation: When Julio hit the baseball, the ball changed the direction after the impact. The contact force exerted by the bat on the baseball when it swing caused the change in direction of the ball. The force exerted in time t is causes change in momentum.
the force of gravity acts on the ball all the time. The speed of the ball is not a factor to change direction. The weight of the air exerts a drag on the ball which is also constant. Hence, only the force of swing caused the changed in the direction of the ball.
It takes 5.0 seconds for a wave with a wavelength of 2.5 m to travel past your location. What’s the period of the wave. What is the frequency of the wave and what’s the speed of the wave
What are two ways you can increase the magnetic field of an electromagnetic?
To increase an electromagnet's magnetic field, add more turns to the coil and increase the current flowing through it. Inserting a ferromagnetic core can also enhance magnetic field strength, but limitations exist due to coil resistance and the properties of superconducting materials.
Explanation:To increase the magnetic field of an electromagnet, you can perform the following modifications:
Increase the number of turns in the coil: Adding more turns to the solenoid will enhance the magnetic field as it is directly proportional to the number of turns in the wire.Increase the current: By increasing the electrical current flowing through the coil, the magnetic field will also increase due to the direct relationship between current and magnetic field strength.Another method often used to enhance the strength of an electromagnet is by inserting a ferromagnetic material, such as iron, within the coil, which acts as a core to concentrate the magnetic field.
However, it is important to note that there are limits to the strength of the magnetic field that can be created. Exceeding certain thresholds can lead to an overheating problem due to coil resistance, or can destroy the superconducting properties if superconducting materials are used.
The air in tires can support a car because gases __________.
How much time does it take a power drill accelerating at 64.3 rad/s2 to achieve 1500. rotations per minute(RPM)?
If a car increases its speed from 20 mph to 60 mph, by what factor does the kinetic energy of the car increase
If a car increases its speed from 20 mph to 60 mph, then the kinetic energy of the car increases by a factor of 9.
What is Kinetic energy?
Kinetic energy is the energy which is present in the object which is under motion. Kinetic energy is a vector quantity due to the presence of both the magnitude and direction. The SI unit of kinetic energy is Joule.
KE = 1/2 × m × v²
where, KE = Kinetic energy,
m = mass of the object,
v = velocity of the object
KE₁ = 1/2m(20)²
KE₂ = 1/2m(60)²
Therefore, the factor by which the kinetic energy of the car can be increased can be calculated by taking ratio of the kinetic energy:
KE₁/ KE₂ = 1/2m(20)² / 1/2m(60)²
KE₁/ KE₂ = 400/ 3600
KE₁/ KE₂ = 1/9
Therefore, the factor by which the kinetic energy of car has been increased by 9.
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Which ions are most abundant in a base?
The hydroxide ions is the most abundant in a base. A base is regarded as a
substance which reacts with an acid to form a salt.
The base has a characteristic feature of having a pH between 7.1 to 14.0.
Strong bases have a pH of about 12-14 while weak bases have a pH of
between 7.1-9.
Bases have hydroxide ions which is responsible for the basic nature of the
substance while an acid has abundant hydrogen ions which is responsible
for its acidic nature.
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Which type of foot PPE must you wear if electrical shock is ever a possibility with your job?
Jodie sets two objects on a flat surface. Object A has a mass of 50g, while object B has a mass of 250g. Jodie pushes both objects with the same force and watches them speed up. Which object will speed up more? A. They speed up the same amount. B. Object B speeds up more. C. Object A speeds up more. D. Neither object speeds up.
Object A speeds up more
Which of the following are heterogeneous mixtures (not homogeneous mixtures)?
Check all that apply.
A. Blood
B. A smoothie
C. Milk that is sold at the store
D. A cake mix
For the lever shown, a = 5 m and b = 2 m. What is the mechanical advantage of the lever?
metabolic processes depend on which factor listed below A.ice B.atospheric nitrogen C.fresh water D.phosphorus
Electromagnetic waves can carry more data at higher frequencies. Why would a scientist opt to transmit data at a lower frequency instead?
What are the limitations of sending information using electromagnetic waves?
What are the differences between analog and digital signals?
What are the advantages of using digital signals over analog signals?
Using reliable internet sources, identify three ways we use analog and digital signals in our everyday lives.
Transmitting data over low frequency electromagnetic waves can reach great distances before attenuation because are not easily interfered with by obstacles like high frequency waves are. This is because they can diffract over obstacles and pass around them with less shadowing.
A disadvantage of using electromagnetic waves to transmit data is interference. One cause of interference is the transmission ton over same frequency hence the necessity to regulate these waves through policies. Other causes of interference are due to weather or obstacles.
Analogue signal is the decoding of electromagnetic waves into electric pulses (of varying amplitudes) by a decoder and pass the electric circuit in the electronics. However, in digital signal, electromagnetic waves are converted to binary format (0s and 1s). Therefore, analogue signal is a continous signal while digital is discretely broken down into bits.
Digital signal have the advantage of analogue signal over the fact that they can carry loads of information. Analogue signal draws more power than digital signal hence the later is eco-friendly. Digital signals are less likely to be affected by noise unlike analogue signals.
One major application for analogue signals is their use is speakers and microphones. Nonetheless, contemporarily, there are emerging digital microphones and speakers. A popular example of application of digital signal is in the mobile communication industry. The shift from analogue to digital has been greatly revolutionalized communication.
Answer:
Part One
1. Electromagnetic waves can carry more data at higher frequencies. Why would a scientist opt to transmit data at a lower frequency instead?
Higher frequencies of electromagnetic waves travel shorter distances but have higher data capacity. Scientists keep in mind that higher frequencies limit the range for sending information.
2. What are the limitations of sending information using electromagnetic waves?
Electromagnetic waves are sent through air signals, air signals are not private, so anybody in range can pick up the signal.
3. What are the differences between analog and digital signals?
Analog signals use more power, whereas digital signals use less. Analog signal value type is positive as well as negative, whereas digital signal is positive.
4. What are the advantages of using digital signals over analog signals?
The advantages of digital signals are better accuracy, less interference, and greater capacity for sending information.
The advantages of analog signals are strength and frequency change, and it travel in a continuous wave.
5. Using reliable internet sources, identify three ways we use analog and digital signals in our everyday lives.
Some examples of how we use analog and digital signals in our daily life is through phones and televisions. Phones use digital signals; they process our speech digitally and remove any unwanted sounds or echoes. Televisions use digital signals of video and audio processing to present them in a better version.
Part Two
1. Describe how radio telescopes are used to explore space.
Radio telescopes are used to detect radio waves in space.
2. How are radio waves used on Earth?
Radio telescopes are like televisions, right? So, using this information we then know that radio telescopes (television antenna) will detect radio waves that connect to satellite communication and that’s how we have television channels.
3. Why do radio telescopes convert radio waves (analog signals) to electrical (digital) signals for analysis? (Hint: What did the article say about the advantages of digital signals?)
The advantages of digital signals are better accuracy, less interference, and greater capacity for sending information.
Explanation:
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What besides mass and gravity , what other factor affects gravitational potential energy?
Which of these is most likely a step in the formation of soil? a. erosion of soil b. crystallization of rocks c. animals digging rocks d. solidification of organic matter
Match the situation with the energy transformation ITEMBANK: Move to Top A boy shooting a rubber band across the classroom A child going down a slide on a playground Rubbing your hands together to warm them on a cold day Turning on a battery operated light Using a dc electric motor Using a gas power heater to warm a room Using a hand crank generator to produce electric current Using the light in your room that is plugged into the wall Chemical potential energy transformed into radiant energy Gravitational potential energy transformed into kinetic energy Elastic potential energy transformed into kinetic energy Chemical potential energy transformed into thermal energy Electrical energy transformed into radiant energy Kinetic energy being transformed into thermal energy Electrical energy transformed into kinetic energy
12) Photosynthesis is a chemical reaction where carbon dioxide and water react to form glucose (C6H12O6) and oxygen gas. Which represents the proper balanced equations for photosynthesis?
Answer : The balanced chemical reaction will be,
[tex]6CO_2+6H_2O\overset{sunlight}\rightarrow C_6H_{12}O_6+6O_2[/tex]
Explanation:
Photosynthesis : It is a type of chemical reaction that occurs in the green plants or living organism.
During the photosynthesis process, the carbon dioxide reacts with water in the presence of sunlight to produce glucose and oxygen as a product.
The balanced chemical reaction will be,
[tex]6CO_2+6H_2O\overset{sunlight}\rightarrow C_6H_{12}O_6+6O_2[/tex]
In the photosynthesis reaction, carbon dioxide and water molecule are the reactants and glucose and oxygen are the products.
Which are states of matter? Check all that apply.
energy
gas
liquid
ion
plasma
solid
Liquid, gas, solid and plasma are States of matter.
What is matter?Matter is anything that have mass and occupied space usually getting it's mass from energy.
There are states of matter and they are;
Solid
Liquid
Gas
Plasma
A state of matter can be termed a physical property if it dies not change the chemical composition of the substance and is reversible.
A state of matter can be called chemical property if the chemical composition is change and it is irreversible.
For example water exist in three state of matter.
It is solid if it is ice, it is liquid if it is water and it is gaseous if it is water vapor.
Therefore, Liquid, gas, solid and plasma are States of matter.
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What is the most power in watts the ear can receive before the listener feels pain?
Final answer:
The human ear starts to feel pain at sound intensities of 1 W/m². There is a broad range of sound intensities that can be heard without pain, but anything at or above the pain threshold may cause immediate hearing damage.
Explanation:
The amount of power in watts that the ear can receive before a listener feels pain is at an intensity of 1 W/m². The human ear is very sensitive and can detect sounds with a minimum threshold of 10−12 W/m² (0 dB). However, exposure to intensities at or above 1 W/m² can be painful. For example, sounds that are much higher in intensity than this level can be unbearable and potentially harmful, potentially leading to immediate damage. It is essential to protect one's hearing with measures such as using earplugs or ear muffs, especially when exposed to sounds of high decibel levels.
The atmospheric temperature decreases when snow starts melting because the snow------------------------- from the atmosphere to melt.
A. releases thermal energy
B. absorbs thermal energy
C. releases temperature
D. absorbs temperature
Which of the following can influence one???s ability to detect stimuli and increase one???s responsiveness to stimuli in dangerous situations?
A.
stimuli criteria
B.
response criteria
C.
difference threshold
D.
detection threshold
Answer: B response criteria
The one that can influence ones ability to detect stimuli and increase responsiveness to stimuli in dangerous situations is response criteria. The correct option is B.
What is stimuli?Stimulus is defined as any event or change in the external environment that causes a specific functional response in an organ or tissue.
The stimulus can be both internal and external. External stimuli such as sound and touch are detected by sense organs such as the ear and sensory receptors such as those in the skin.
A stimulus is an energy change (e.g., light or sound) that is registered by the senses (e.g., vision, hearing, taste, etc.) and serves as the foundation for perception in perceptual psychology.
A stimulus serves as the foundation for behavior in behavioral psychology (classical and operant conditioning).
Response criteria are those that can influence one's ability to detect stimuli and increase responsiveness to stimuli in dangerous situations.
Thus, the correct option is B.
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What can cause the sea level to fall? ocean basins getting smaller or water being removed from the hydrological cycle ocean basins getting larger or water being removed from the hydrological cycle ocean basins getting larger or water returning to the hydrological cycle ocean basins getting smaller or water returning to the hydrological cycle
If planet i is 30.3 million miles farther from the sun than planet ii, then planet iii is 24.6 million miles farther from the sun than planet i. when the total of the distances for these three planets from the sun is 196.2 million miles, how far away from the sun is planet ii?
how high a hill would a 75 kg hiker has to climb to increase her gravitational potential energy by 10000 j
Answer:
[tex]13.60 \ m[/tex]
Explanation:
Given that,
Mass of the hiker is 75 kg
The gravitational potential energy by 10000 J
To solve :
The height of the hill.
Solve :
The gravitational potential energy of object , [tex]G=10000\ J[/tex].
Also, Mass of hiker, [tex]m=75 \ kg.[/tex]
Now,
The relation between Gravitational potential energy (G) and Mass of object (M) is given as:
[tex]G=m\times g \times h.[/tex]
Where , g is acceleration due to gravity, [tex]g=9.8\ m/s^2.[/tex].
Putting , values of G, g and m in above equation.
We get, [tex]10000=75\times 9.8 \times h\\\\h=\dfrac{10000}{75\times 9.8} \ m\\\\h=13.60\ m[/tex]
Hence , this is the required solution.
a rigid tank of air is cooled (temperature decreased) the volume has to remain constant because it is a rigid tank the air pressure in the rigid tank ___
A. Increases
B. Decreases
C. Stays the same
20 points please help right away
A blender takes in 180 J of electrical energy. Of the 180 J, 90 J are transformed into kinetic energy, 60 J are transformed into thermal energy, and the rest is transformed into sound.
Based on the work done by the blender, the efficiency of the blender is 50%.
What is efficiency of a machine?The efficiency of a machine is a measure of the amount of useful work done by the machine compared to the work input into the machine.
Efficiency = work output/work input × 100%The useful work on a blender is the motion of the blender which is a form of kinetic energy.
The efficiency of the blender so then be:
work input = 180 J
work output = 90J
Efficiency = 90/180 × 00% = 50 %
Therefore, the efficiency of the blender is 50%.
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When vehicles meet on a steep, narrow road, not wide enough for two vehicles, which vehicle must yield the right-of-way?
A. The vehicle going uphill
B. The vehicle going downhill
C. The vehicle going slower
Answer: B. The vehicle going downhill
Explanation: The vehicle going huphill needs more force to move, while the vehicle moving downhill actually can be moved only by the gravity acceleration.
So when both cars meet, if the car going uphill loses momentum, the vehicle may not be capable to keep moving uphill after that, so is better that the car going downhill yields the right-of-way to the other car, that needs to preserve the momentum.
Which of the following processes add methane (CH4) to the atmosphere?
A.Breakdown of plant and animal remains in the soil.
B. Leakage from natural gas pipelines.
C. Food digestion by land animals.
D.All of the above.
Answer: D.All of the above.
Methane is a colourless odourless gas that develops abundantly in nature.
A.Breakdown of plant and animal remains in the soil: The plant and animal remains contains large amount of organic matter, which is decomposed by soil bacteria. This process results in formation of methane gas. The process takes place in the absence of oxygen, hence, called as anaerobic decomposition. This gas gets liberated to the external environment.
B. Leakage from natural gas pipelines: The natural gas is obtained as a fossil fuel from deep layers of the earth. This gas is excavated in order to use it as fuel to run vehicles and for cooking food. The gas may liberate to the external environment by leakage.
C. Food digestion by land animals: The land animals such as cow and buffalo discharge dung, which is a rich source of methane. The methane gets liberated from the cow dung to the external environment.
Therefore, all processes are responsible for liberation of methane to the external environment.
All of the above the following processes add methane (CH₄) to the atmosphere.All the options are correct.Hence D is the correct option.
What is methane?Methane is a colorless, odorless gas that occurs naturally in large quantities.
A.Soil bacteria digest plant and animal remnants: Plant and animal remains include a huge quantity of organic materials, which soil bacteria degrade.
Methane gas is produced as a result of this process. Anaerobic decomposition is a type of breakdown that occurs in the absence of oxygen. This gas is then released into the atmosphere.
B. Natural gas pipeline leakage: Natural gas is a fossil fuel that is extracted from deep layers of the earth.
This gas is mined in order to use it as a source of energy for cars and cooking. Leakage might allow the gas to escape into the environment.
C. Food digestion in land animals: Land animals digest food in a variety of ways.
Hence option D is correct.
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