Intuition might tell us that rough surfaces on clothing would inhibit the speed of an Olympic athlete. Why is this line of thinking not true in some cases? How can controlled roughness actually promote speed?
Answer:
We associate roughness with a greater coefficient of friction, then we think that rough surfaces on clothing would inhibit the speed of an Olympic athlete. This is not always true because the amount of roughness might improve the way air pass through the fabric.
One example of controlled roughness that actually promote speed are the dimples on golf balls. Dimples create turbulence around the ball, which sucks air to the ball, making its displacement easier and promoting its speed.
Which object has elastic potential energy? a piece of bread a ball at rest a stretched rubber band a falling leaf
A stretched rubber band has elastic potential energy.
You replace a 200 W lamp with a more efficient 55 W LED lamp. If you leave your lights on 24 hours a day, how much energy are you saving each day by replacing this bulb?
A.21,225,000 J
B.17,280,000 J
C.4,752,000 J
D.12,528,000 J
The amount of energy will be 12,528,000 J.
What is energy?Energy represents the ability to do tasks. This could exist in several forms, including potential, kinetic, thermal, electrical, chemical, radioactive, and others.
Given data:
[tex]P_{1} = 200 W\\P_{2} = 55W[/tex]
Calculation of energy
The energy can be calculated by using the formula:
ΔW = [tex]W_{1} - W_{2}[/tex]
It is known that, w = pt
where, w is energy and p is power.
ΔW =
[tex]= P_{1}t - P_{2}t = t(P_{1}- P_{2}) \\= 86400 (200 - 55) \\= 12528000 J[/tex]
Therefore, the amount of energy will be 12,528,000 J.
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Whenever possible, these types of power plants should be built because they generate virtually no pollution.
A.biomass power plants
B.geothermal power plants
C.nuclear power plants
D.natural gas power plants
Geothermal facilities are very expensive to build and are only able to be built in areas with the correct geology. These power plants operate virtually emission and pollution free, and they do not require fuel or waste to be shipped to or from the facility.
The second option would be nuclear power plants. However, nuclear power plants can leave behind radiation and radiated waste which is considered pollution.
Biomass power plants, geothermal power plants, and nuclear power plants are types of power plants that generate virtually no pollution.
Explanation:Biomass power plants, geothermal power plants, and nuclear power plants are types of power plants that generate virtually no pollution. Biomass power plants burn organic matter (biomass) from plants to create electricity, while geothermal power plants use the natural heat flow from the Earth's core to generate steam that turns turbines and produces electricity. Nuclear power plants use fission to generate electricity without emitting air pollutants or CO2. However, it is important to note that nuclear power plants produce radioactive waste that needs to be safely stored for an extended period of time.
Which of the following frictionless ramps (A, B, or C) will give the ball the greatest speed at the bottom of the ramp? Explain.
Answer:
The ball would have greatest speed at the bottom of ramp C
Explanation:
From the given ramps, C would generate the highest potential energy especially at the highest point that the ball starts to move down the ramp. Potential energy is the energy possessed by an object moving with a uniform velocit or at rest. Since potential energy increases with height, the potential energy gained by the ball on ramp C would cause an increase in its momentum as it glides down to the bottom of the ramp.
A car traveling at speed of 24 m/s comes to stop at the red light how much time will it take for the car to stop if its acceleration is -8.0 M/S2
Answer:
The car take the time is 3.0 sec
Explanation:
Given that,
Speed = 24 m/s
Acceleration = -8.0 m/s²
We need to calculate the time
Using equation of motion
[tex]v = u+at[/tex]
Where, v = final velocity
u = initial velocity
a = acceleration
t = time
Put the value into the formula
[tex]0=24-8.0\times t[/tex]
[tex]t =\dfrac{24}{8.0}[/tex]
[tex]t = 3.0\ sec[/tex]
Hence, The car take the time is 3.0 sec.
What is the width of a rectangle with an area of 5/8 inches2 and a length of 10 inches
Hypothesize whether you think each of the following substances will be an acid, a base, or neutral:
Bleach —
Detergent —
Eye drops —
Lemon juice —
Tea —
Bleach is a base. Detergent is a base. Eye drops are a neutral. Lemon juice is an acid. Tea is an acid.
What is Acid ?Acid is any material that when dissolved in water has a sour taste, alters the colour of some indicators (blue litmus paper turns red, for example), combines with some metals (like iron) to release hydrogen, reacts with bases to produce salts, and catalyses various chemical reactions. Acids are examples of both organic chemicals that belong to the carboxylic acid, sulfonic acid, and phenol groups as well as the inorganic substances known as the mineral acids, such as sulfuric, nitric, hydrochloric, and phosphoric acids. These materials contain one or more hydrogen atoms, which are discharged as positively charged hydrogen ions when they dissolve in a solution (see the Arrhenius hypothesis).
The Brnsted-Lowry theory and the Lewis theory provide broader definitions of an acid that encompass chemicals that display typical acidic behaviour as pure compounds or when dissolved in solvents other than water.
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Provide two examples of things that apply to both relative and absolute dating.
A deciliter is how many times larger than a milliliter
On which factor coefficient of cubical expansion depends?
what is the difference between a total solar eclipse and a partial
F = Gm2/r2 G = ? I need help asap
Answer:
Universal Gravitational Constant
Explanation:
Universal Gravitational Constant or G is used in calculating the gravitational force between two objects. The force (F) is given by,
[tex]F = \frac{GMm}{r^{2}}[/tex]
where,
M and m = mass of two objects
r = distance between the centers of the two objects
The value of G with an accuracy of 99% was first calculated by Henry Cavendish in 1798.
The value of [tex]G = 6.67 \times 10^{-11}[/tex] m³kg⁻¹s⁻²
Answer:
G = Fr2/m2
Explanation:
we have to isolate G
multiply r2 on both sides
Fr2 = gm2
and then divide m2
Fr2/m2= G
What product of the greenhouse effect could lead to more extreme weather events?
Imagine you are taking a road trip! Select a destination and navigate the trip. Answer the following questions in one or more complete sentences: Where will you go on your trip? Imagine you are taking a road trip! Select a destination and navigate the trip. Answer the following questions in one or more complete sentences: Where will you go on your trip?
I chose to travel from New York City to Miami, traveling along Interstate 95 South. The journey is about 1,280 miles and takes around 19 hours by car. Essential items include a GPS, emergency car kit, snacks, and water.
For my road trip, I will choose to travel from New York City to Miami, Florida. To plan the trip, I first identify my starting point, New York City. I will take Interstate 95 South, which provides a direct route to Miami. Along the way, I will pass through several major cities including Philadelphia, Baltimore, Washington D.C., and Savannah. To ensure a safe trip, I will monitor my car's fuel levels, engine performance, and be prepared to reroute if necessary.
The journey from New York City to Miami covers roughly 1,280 miles, which can take about 19 hours of driving. Essential items to pack include a GPS for navigation, an emergency car kit, and sufficient snacks and water. Comfort items might include a travel pillow and entertainment options like books or music.
The contamination that results from the spread of bacteria from meat to vegetables is called
Answer:
Cross contamination.
Step-by-Step Explanation:
The contamination that results from spread of bacteria from meat to vegetable is called cross contamination which means the bacteria from one type of food transferred to other food which eventually spoil the food.
This happens by direct contact of two types of food.
The contamination that results from the spread of bacteria from meat to vegetables is called Cross-contamination.
Cross-contamination is the movement of bacteria or other pathogenic microbes from one food item or surface to another, which can result in the spread of diseases.
In the case of meat and vegetables, cross-contamination can happen if bacteria from uncooked or carelessly handled meat come into contact with vegetables, either directly or through shared surfaces. This may occur while handling, storing, or preparing food.
Using separate cutting boards and utensils for raw meat and raw vegetables, washing your hands completely after handling raw meat, and storing meat and vegetables separately in the refrigerator are all critical ways to reduce the risk of cross-contamination.
Hence, the contamination that results from the spread of bacteria from meat to vegetables is called cross- contamination.
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Steel is a mixture of iron and carbon. It can be separated into iron and carbon by melting it. What is steel?
A. A compound
B. An element
C. A molecule
D. An alloy
20 points! science
A heating element being placed in one end of an aquarium can heat the whole aquarium because of heat transfer by convection conduction radiation evaporation
Which of the following is the reason a lever is used in a shovel?
A. a lever is used to decrease effort force
B. a lever is used to decrease resistance force
C. a lever is used to increase resistance force
D. a lever is used to increase the effort force
An object is thrown with an initial velocity v0 forming an angle θ with an inclined plane, which a In turn it forms an α-angle α with a horizontal plane.
A) Find the distance X from the launch point to the point where the object falls. X = F (v0, θ, α, g)
B) Find the distance for v0 = 20m / s, θ = 53o , α= 36 ° , g = 9.8m / s2
Maurice pulls on the end of a spring scale. He lets go of the end and observes the spring snap back into place. What force restores the spring to its original shape?
a. tension
b. elastic
c. drag
d. applied
Answer:
Elastic Force
Explanation:
As we pull the spring from one of its end by some distance such that its length is stretched by some amount "x"
So here the restoring force on the spring is given as
[tex]F = kx[/tex]
so here we know
k = coefficient of elasticity
x = change in the length of spring
So here the restoring force on the spring will be Elastic force which always act opposite to the direction of displacement of the spring
A model rocket with a mass of 0.181 kg is launched into the air with an initial speed of 92 m/s. How much kinetic energy will the rocket have at a height of 164 m? Assume there is no wind resistance.
303 J - 747 J - 634 J - 444 J
I have tried taking the initial KE with 1/2*.181*92^2 and subtracted the final potential energy .181*9.8*164. This gets me 475, which isn't any of the choices. I picked 444 J since it was the closest, but it was wrong.
Read “Solar Basics” on the Energy Kids website. Specifically, read text under “Two limitations of solar energy”. Use the information to answer the question. What factors affect the amount of solar energy that reaches the Earth’s surface?
Sample Response: The amount of solar energy that reaches the Earth’s surface depends on the weather, location, and time of year.
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Faraday's law states that voltage cannot be increased by moving a magnet towards a coil.
a. true
b. false
The answer is false.
If 20 beats are produced within one second, which of the following frequencies could possibly be held by two sound waves traveling through a medium along a common path at the same time
A. 22 Hz and 42 Hz
B. 47 Hz and 55 Hz
C. 38 Hz and 63 Hz
D. 18 Hz and 26 Hz?
Answer:
A. 22 Hz and 42 Hz
Explanation:
When two waves of slightly different frequency meet each other, they produce an interference pattern called beat. The frequency of this beat is equal to the absolute value of the difference between the individual frequencies of the two waves:
[tex]f_B=|f_1-f_2|[/tex]
In this problem, we have 20 beats per second, so the beat frequency is
[tex]f_B = \frac{20}{1 s}=20 Hz[/tex]
Therefore, we have to find the pair of waves whose frequency difference is 20 Hz. Let's analyze each choice:
A. [tex]f_B = |22 Hz - 42 Hz|=20 Hz[/tex] --> YES
B. [tex]f_B = |47 Hz - 55 Hz|=8 Hz[/tex] --> NO
C. [tex]f_B = |38 Hz - 63 Hz|=25 Hz[/tex] --> NO
D. [tex]f_B = |18 Hz - 26 Hz|=8 Hz[/tex] --> NO
So, the correct choice is A.
What is a Substance?
A) a uniform mixture that can’t be separated
B) a mixture that can be separated
C) a single component that can’t be separated
D) a single component that can be separated
A substance is a single component that cannot be separated into other substances. Homogeneous mixtures exemplify this concept.
Substance refers to a single component that can't be separated into other substances through chemical means. A homogeneous mixture is a type of substance that is uniform throughout, like salt dissolved in water.
The amount of a fossil fuel that can be extracted at a profit using current technology is called what?
*Answer ASAP*
Describe how electromagnetic waves are formed and travel through space.
Electromagnetic waves are created by a charged particle that generates an electric field. The electric field creates a magnetic field. As the charged particle moves, the electric field and magnetic field keep changing, which causes the wave to move.
Which of the following quantities is a vector in character?
electric field
electric charge
electric energy
electric potential difference
The correct option is Option A (Electric Field). Among the given options, the electric field is a vector quantity. The other quantities such as electric charge, electric energy, and electric potential difference are all scalars.
Among the given quantities, the electric field is a vector quantity, while the others are scalars. A vector quantity has both magnitude and direction, making it possible to be represented by arrows indicating the direction and strength of the field.
Key differences :
Electric field: A vector quantity represented by E, which denotes force per unit charge and has both magnitude and direction.Electric charge: A scalar quantity representing the amount of electric charge.Electric energy: A scalar quantity representing the potential energy in the system.Electric potential difference: A scalar quantity representing the difference in electric potential between two points.For example, the electric potential of a point charge is given by V = kQ/r, which is a scalar, whereas the electric field is defined as the force per unit charge and is a vector.
An iron nail is made up of particles. What is true about the particles?
Answer: " The correct answer is "They stay in place and vibrate." For the other answer options, iron nails are solid particles and in a solid, molecules are packed together (i.e. the space between them is very small) and do not move all over the place because of a strong force of attraction between them, and it keeps its shape and stays in place and vibrate.
Explanation: What is true about the particles?" The correct answer is "They stay in place and vibrate." For the other answer options, iron nails are solid particles and in a solid, molecules are packed together (i.e. the space between them is very small) and do not move all over the place because of a strong force of attraction between them, and it keeps its shape and stays in place and vibrate.
Answer: "They stay in place and vibrate." For the other answer options, iron nails are solid particles and in a solid, molecules are packed together (i.e. the space between them is very small) and do not move all over the place because of a strong force of attraction between them, and it keeps its shape and stays in place and vibrate.
Explanation: