7. In what ways has science harmed us?
Answers
Answer: At several different levels, scientific awareness will enhance the quality of life, from the routine functioning of our daily lives to global issues. In energy, conservation, agriculture, health, transportation, communication, security, economics, recreation, and discovery, science informs public policy and personal decisions.
Explanation:
Hope This Helps! : )
Related Questions
if a gun shoots a bullet straight up with an initial speed of 400 m/s, then how high will the bullet go? (8163 m) g
Answers
The height the bullet will reach is 8163 m. We use kinematic equations to find the result.
How to find the height of an object will reach?In this case, the height the bullet will reach is determined by the initial speed, gravitational acceleration, and the time it is in the air. Using kinematic equations, the height of the bullet can be calculated as follows:
Initial vertical velocity, vi = 400 m/sGravitational acceleration, g = 9.81 m/sTime of flight, t = ?Using the equation vf = vi + g × t, the final vertical velocity can be calculated as:
vf = 400 + 9.81 × t
vf = 0
Rearranging the equation and solving for t yields:
t = -400/9.81 = -40.7 s
The initial vertical velocity is equal and opposite to the final velocity, thus the time of flight is 40.7 s. To calculate the maximum height the bullet reaches, use the equation h = vi × t + 1/2 × g × t²:
h = 400 × (-40.7) + 1/2 × 9.81 × (-40.7)²
h = 8163 m
Therefore, the bullet will reach a maximum height of 8163 m.
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Vector A⃗ points along the negative x axis and vector B⃗ along the positive z axis.
What is the direction of A⃗ ×B⃗ ?
What is the direction of B⃗ ×A⃗ ?
What is the magnitude of A⃗ ×B⃗ ?
What is the magnitude of B⃗ ×A⃗ ?
Answers
The magnitude of B⃗ ×A⃗ is equal to the product of the magnitudes of vectors A⃗ and B⃗.
|B⃗ ×A⃗ | = |( |A||B|, 0, 0 )| is the direction of A⃗ ×B⃗.
|B⃗ ×A⃗ | = √(|A||B|)² + 0² + 0² is the direction of B⃗ ×A⃗.
|B⃗ ×A⃗ | = √(|A|²|B|²) is the magnitude of A⃗ ×B⃗.
|B⃗ ×A⃗ | = |A||B| is the magnitude of B⃗ ×A⃗.
To find the magnitude of B⃗ ×A⃗, we first need to determine the cross product of B⃗ and A⃗. The cross product of two vectors A⃗ and B⃗ is another vector C⃗ that is perpendicular to both A⃗ and B⃗. The direction of the cross product is determined by the right-hand rule, which states that if you curl the fingers of your right hand from A⃗ to B⃗, then your thumb will point in the direction of C⃗.
Since vector A⃗ points along the negative x-axis, its components are (-|A|, 0, 0). Similarly, vector B⃗ along the positive z-axis has components (0, 0, |B|). The cross product of these two vectors is given by:
B⃗ ×A⃗ = (0, -|B|, 0) × (-|A|, 0, 0)
Using the cross product formula, we can calculate:
B⃗ ×A⃗ = (0×0 - (-|B|)×(-|A|), 0×(-|A|) - 0×0, 0×0 - 0×(-|B|))
B⃗ ×A⃗ = (|A||B|, 0, 0)
The magnitude of this vector is simply the length of the vector, which is given by:
|B⃗ ×A⃗ | = |( |A||B|, 0, 0 )|
|B⃗ ×A⃗ | = √(|A||B|)² + 0² + 0²
|B⃗ ×A⃗ | = √(|A|²|B|²)
|B⃗ ×A⃗ | = |A||B|
Therefore, the magnitude of B⃗ ×A⃗ is equal to the product of the magnitudes of vectors A⃗ and B⃗.
|B⃗ ×A⃗ | = |( |A||B|, 0, 0 )| is the direction of A⃗ ×B⃗.
|B⃗ ×A⃗ | = √(|A||B|)² + 0² + 0² is the direction of B⃗ ×A⃗.
|B⃗ ×A⃗ | = √(|A|²|B|²) is the magnitude of A⃗ ×B⃗.
|B⃗ ×A⃗ | = |A||B| is the magnitude of B⃗ ×A⃗.
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Fill in the table below with the properties of acids and bases.
Draw lines between the properties that are the same.
Answers
Answer:
1) Acids have a sour taste , Bases have a bitter taste.
2) Acids turn blue litmus paper into red , Bases turn red litmus paper into blue.
3) Acids react with most metals to form Hydrogen gas but only a few base react with a few metals to form Hydrogen gas
4) Both will conduct electricity. Both acids & bases are good electrolytes. Strong acids & bases conduct more electricity than that of weak acids & bases
Fill in the blanks with the properties of acids and bases as follows:
Taste: Acids generally have a sour taste while bases possess a bitter taste.Color change of litmus paper: Acids significantly transform the blue litmus paper into red while bases turn red litmus paper into blue.Reaction with metals to produce hydrogen gas: All acids react with metals in order to produce hydrogen gas while only some bases have this property. Electrical conductivity: Both acids and bases in an aqueous solution considerably conduct electricity. What are the properties of acids?The properties of acids are as follows:
Acids typically react with bases in order to produce salt and water.Acids react with metals to synthesize hydrogen gas.Acids transform the color of certain acid-base indicators.Acids generally have a sour taste. They are good conductors of electricity in an aqueous solution.Therefore, fill in the blanks with the properties of acids and bases are well described above.
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An airplane accelerates down a runway at 3.0 m/s/s for 10 s until it finally lifts off the ground.
Determine the velocity at take-off.
Answers
Answer:
30 m/s
Explanation:
Given:
v₀ = 0 m/s
a = 3.0 m/s²
t = 10 s
Find: v
v = at + v₀
v = (3.0 m/s²) (10 s) + 0 m/s
v = 30 m/s
A keg of beer is covered with a wet towel. Imagine that the keg gains energy from its surroundings at a rate of 20 W. At what rate in grams per second must water evaporate from a towel placed over the keg to cool the keg at the same rate that energy is being absorbed?
Answers
The rate of water evaporation from the towel must be 30 g/s in order to cool the keg at the same rate of energy absorption (20 W).
What is Evaporation?Evaporation is the process by which a liquid is transformed into a gas. This process, often referred to as vaporization, occurs when molecules in the liquid state gain enough energy to break the bonds that hold them together, allowing them to escape into the air as vapor.
This energy is typically provided by heat, but can also be provided by other means such as pressure or electrical energy. Evaporation can occur at any temperature, but is most common at the boiling point of a liquid.
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A car covers a distance of 200m. If its velocity is 20 m/s², calculate the time taken.
Answers
Your answer is 10 seconds.
Which is NOT a type of skeletal muscle action?
Which is NOT a type of skeletal muscle action?
concentric movement
eccentric movement
static movement
isometric movement
Answers
In order to enhance flexibility, you can normally hold any position often at the limit of a particular joint's range of motion for a short period of time. Static movement is not a type of skeletal muscle action. Therefore, option C is correct.
What is static movement ?In static movement, you can normally hold any position often at the limit of a particular joint's range of motion for a short period of time. All of these spans share a lack of movement, hence the moniker static. There should be no bouncing, shifting, or repetitive motion.
Isotonic, isometric, and isokinetic muscular contractions are the three basic types that occur during exercise. Additionally, based on whether the muscle lengthens or shortens during contraction, we further divide them into concentric and eccentric groups.
Thus, option C is correct.
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Tomas wants to paint his bedroom. He goes to the store and buys two cans of paint.
Which simple machine would make it easier for him to open the cans?
A a lever
B. a pulley
C. an inclined plane
D. a wheel and axle
Answers
youre welcome
Answer:
I think the answer is c
Explanation:
I had this problem once
A team of students uses a Bunsen burner to heat a beaker full of ice and uses a thermometer to measure the temperature of the sample as it heats. Their data indicate that the ice maintains a constant temperature of 0°C. Which of the following could be occurring? Select all the options that apply.
Answers
Answer:
1. The ice molecules are at a temperature of 0°C;
2. The ice molecules are absorbing latent heat which would result in their turning to liquid water. Therefore, melting or fusion is occurring.
Note: The question did not provide any options to choose from.
Explanation:
The process of change of state occurs when heat is added or removed from a substance. For example, solid may change to a liquid when heat is added to it whereas a liquid may change to liquid when heat is removed from it.
During the process of change of state, the temperature of the substance undergoing a change of state does not change throughout the time it is undergoing the change. The temperature will begin to increase or decrease when all the molecules of the substance has undergone a change of state. The heat supplied to or removed from a substance during a change of state is known as latent heat.
When a solid changes to liquid, it is known as fusion and the heat absorbed by the solid substance is known as latent heat heat of fusion. If a liquid changes to gas, it is known as vaporization and the heat absorbed by the liquid is known as latent heat of vaporization.
In the experiment by the students above, since the temperature of the ice remains constant at 0°C when heat is supplied from the Bunsen burner to it, the following processes could be occurring:
the ice is at a temperature of 0°C;the ice molecules are absorbing latent heat which would result in their turning to liquid watermelting or fusion is occurringAnswer: B, C, D
Explanation:
trust me
Consider the following signal f(t)=sin(2πt)+3sin(8πt)+cos(3πt). (a) (2 marks) What is the highest angular frequency present in the signal? What is the highest numerical frequency present in the signal? (b) (2 marks) What is the Nyquist rate of the signal? Did you use the angular or the numerical frequency? (c) (3 marks) If you sample this signal with sampling period T, which values of T satisfy the Nyquist requirement? Choose and fix one such T. (d) (3 marks) Suppose you sample a signal and pass it through a low-pass filter. What is the range of cutoff frequency Mo that can be chosen in 0 the low-pass filter to avoid aliasing and avoid signal loss? (e) (BONUS - 5 marks) Compute the Fourier series coefficient Cn of f(t).
Answers
(a) The highest angular frequency present in the signal is 3π rad/s, and the highest numerical frequency present in the signal is 3/π Hz.
(b) The Nyquist rate of the signal is 6/π Hz, using the numerical frequency.
(c) The values of T that satisfy the Nyquist requirement are T ≤ π/3, and one such value could be T = π/6.
(d) To avoid aliasing and signal loss, the cutoff frequency (Mo) of the low-pass filter should be Mo < 3/π Hz.
(e) Fourier series coefficients (Cn) of f(t) require detailed calculations based on the given signal equation and specific limits.
(a) The highest angular frequency present in the signal is 3π rad/s. The highest numerical frequency present in the signal is 3/π Hz.
(b) The Nyquist rate of the signal is twice the highest numerical frequency. Therefore, it is 6/π Hz. The numerical frequency is used for the Nyquist rate calculation.
(c) To satisfy the Nyquist requirement, the sampling period (T) should be less than or equal to 1/(2 times the highest numerical frequency). Therefore, T ≤ π/3. One such value that satisfies this requirement could be T = π/6.
(d) To avoid aliasing and signal loss, the cutoff frequency (Mo) of the low-pass filter should be set below the highest numerical frequency present in the signal. Therefore, Mo < 3/π Hz.
(e) Computing the Fourier series coefficients (Cn) of f(t) requires detailed calculations based on the given signal equation. Without specific limits of the series or duration of the signal, it is not possible to provide a precise answer in this case.
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Classify the muscle actions based on whether they are acting as an agonist, antagonist, or synergist.
The biceps brachii and brachioradialis contract to flex your forearm at the elbow
Answers
The action of muscles on acting depend upon biceps brachii and brachioradialis contacts to forearm flex the elbow are Antagonist Agonist The triceps brachii is stretched as you flex your forearm on the elbow.
The brachialis muscle is a top flexor of the forearm on the elbow joint. It is fusiform in form and positioned withinside the anterior (flexor) compartment of the arm, deep to the biceps brachii. The brachialis is a extensive muscle, with its broadest element positioned withinside the center in preference to at both of its extremities.
Biceps works with different muscle groups in its roles being: One of 3 muscle groups that flex the elbow and it does this paintings together with the brachialis and brachioradialis. The triceps brachii contracts to increase the forearm Synergist The biceps brachii and brachioradialis settlement to flex your forearm on the elbow.
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Isaac throws an apple straight down from a tree with an initial speed of 5.0 \dfrac{\text m}{\text s}5.0 s m 5, point, 0, start fraction, start text, m, end text, divided by, start text, s, end text, end fraction. It hits the ground with a final speed of 12 \dfrac{\text m}{\text s}12 s m 12, start fraction, start text, m, end text, divided by, start text, s, end text, end fraction. How many seconds did the apple fall?
Answers
Answer:
0.71s
Explanation:
From Newton's law of motion ;
V =U +gt
V is the final velocity or speed
U is the initial velocity or speed
g is acceleration of free fall due to gravity given as 9.8m/S2
Note when a body moves horizontally down its said to do so with the aid of the force of gravity
Hence the final velocity is aided by gravity.
From the above formula;
t =V-U/ g
t= 12-5/ 9.8 = 0.71s
Answer: .71
Explanation:
Khan academy
20. There is a bell at the top of a tower that is 45 m high. The bell weighs 19 kg. The bell has
energy. Calculate it.
Answers
Explanation:
Find an energy is E =mgh, so E = 45*10*19=8550j
People often use simple machines like pulleys, levers, and ramps because they say the machine “makes the work easier.” Which of the following statements about simple machines is true?
a.
Simple machines often reduce the amount of work to move an object.
b.
Simple machines often reduce the energy required to move an object.
c.
Simple machines often reduce the power consumed when moving an object.
d.
Simple machines often reduce the force needed to move an object.
Answers
Hope this help
Circle the words that relate to BOTH Nuclear and Coal Burning power generation.Cross out the words that ONLY apply to Coal Burning power plants.fuel rods - steam - generator - turbine - uranium - CO2 emissions - nonrenewable - radiation - heat
Answers
The words that relate to BOTH Nuclear and Coal Burning power generation: fuel rods - steam - generator - turbine - heat. The words that ONLY apply to Coal Burning power plants: CO2 emissions - nonrenewable
Both nuclear and coal-burning power plants use heat to generate electricity. In a nuclear power plant, the heat is produced by the fission of uranium atoms. In a coal-burning power plant, the heat is produced by the combustion of coal. The heat is then used to boil water, which turns into steam. The steam drives a turbine, which generates electricity.
Nuclear power plants do not produce CO2 emissions, but they do produce radioactive waste. Coal-burning power plants produce CO2 emissions, but they do not produce radioactive waste.
Nuclear power plants are considered to be a nonrenewable resource because uranium is a finite resource. Coal-burning power plants are also considered to be a nonrenewable resource because coal is a finite resource.
Nuclear power plants emit radiation, but the amount of radiation released is very small. Coal-burning power plants do not emit radiation.
Overall, nuclear power plants and coal-burning power plants have both advantages and disadvantages. The best choice of power plant for a particular region will depend on a variety of factors, including the availability of resources, the cost of electricity, and the environmental impact.
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A tugboat is pulling a barge into a harbor. The barge is exerting a force of 3000 N against the tugboat.
Answers
Available options are:
A. –4500 N
B. –2500 N
C. 2500 N
D. 4500 N
Answer:
-4500 N
Explanation:
Given that we have F₁ = 3000N? (force of the barge)
the force of the tugboat is F '
To pull the barge, the force of the tugboat must be greater than or equal to the force of the barge.
Hence, according to Newton's third law which states that for every action or force in nature, there is an opposite reaction.
Therefore considering the available option the correct answer is "- 4500N, " this is because it is greater than the force of the barge and it's in opposition to the force exerted.
Answer:
The answer is -4500 N
Explanation:
the subtle changes in the color of starlight let astronomers find planets, measure the speeds of galaxies, and track the expansion of the universe is called?
Answers
Answer:
Redshift, Blueshift, Doppler Effect, or Doppler Shift
Explanation:
When a star is moving towards us, the light waves get compacted and the light appears blue, this is known as blueshift.
When a star is moving away from us, the light waves get spread apart and the light appears red, this is known as redshift.
Both of these are called the doppler effect or doppler shift.
I'm not sure which answer you need but I hope this helps!
Answer in the proper number of significant numbers
23.4 x 14
Answers
Answer:
327.6 is the answer but there is 2 sig figs in 14 so change it to 330
so 330 is the final answer
hope this helps
have a good day :)
Explanation:
The multiplication product of 23.4 × 14 is 327.6. However, there is only two significant figures in 14. So we have to take the answer in 2 significant figure. Hence, the product can be written as 3.3 × 10².
What are significant figures ?Significant figures are number of digits which can be counted as certain values associated with some uncertainties as well. There are certain rules regrading the count of significant figures in a number.
The zeros after a non-decimal number cannot be taken as significant. For eg, in 4500, there are only two significant figures. The common rule for all the arithmetic operation is that, the significant figures in the product have to be equal to the number of significant figure in the number in the operation with least significant figures.
Here, the one with least significant figures is 14. It have two significant figures. Now, product of the two numbers is :
23.4 × 14 = 327.6
But the rounded product for correct significant figure is 3.3 × 10².
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1.How far does a car travel in 0.75 h, if it is moving at a constant speed of 88km/h?
Then calculate the velocity if the start point is equal to the endpoint.
2.A passenger elevator travels from the first floor to the 60th floor, a distance of 210 m in 35s.
What is the elevator’s speed?
What is the elevator’s velocity?
Answers
Answer:
answer in the pic
Explanation:
if this is weong please tell me
1. 0.75 h and 88km/h 2.210 m and 35 s
If our frame of reference was the sun would the earth be moving?
Answers
Answer:
yes, thats how it becomes morning and night
u get it
Explanation:
Can someone please Help me
Answers
Answer: The answer to 3 to is less inertia. The answer to 4 is large amount of inertia. The answer to 5 is large amount of inertia. The answer to 6 is more fuel. Number 6 is kind of unkown considering I can’t see the other answer but I guess it’s more fuel.
Explanation: Inertia is the resistance of the object to any change in its motion, including a change in direction. An object will stay still or keep moving at the same speed and in a straight line, unless it is acted upon by an external unbalanced force. So when there is more inertia, it’s harder to control, but when it has less inertia, it’s more loose and easier to move around.
PLEASE HELP !
What is the acceleration of a ball that starts at rest and increases in speed
to 20 m/s in 45 seconds? *
Answers
which of gardner's intelligences would be least important for a car salesperson?
Answers
The least important intelligence from Gardner's theory for a car salesperson would likely be the Intrapersonal Intelligence.
Gardner's theory of multiple intelligences suggests that individuals possess different types of intelligences, including linguistic, logical-mathematical, spatial, bodily-kinesthetic, musical, interpersonal, intrapersonal, naturalistic, and existential intelligence.
Intrapersonal Intelligence refers to self-awareness and understanding one's own thoughts, emotions, and motivations. It involves introspection, reflection, and the ability to set goals and manage oneself effectively. While this intelligence is valuable in many professions and aspects of life, it may not be as crucial for a car salesperson.
In the context of a car salesperson's role, other intelligences such as interpersonal intelligence, linguistic intelligence, and perhaps even logical-mathematical intelligence are likely to be more important. Effective car salespeople need to possess strong interpersonal skills to build rapport with customers, communicate persuasively, and understand their needs and preferences.
Additionally, linguistic intelligence is valuable for effective communication and conveying product knowledge. Logical-mathematical intelligence can aid in understanding financing options or calculating costs, although it may not be as central to the role as interpersonal and linguistic intelligences. While intrapersonal intelligence is valuable in various contexts, it may be less critical for a car salesperson's success.
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A plane can fly 390 miles in the same time as it takes a car to go 120 miles. If the car travels 90 mph slower than the plane, find the speed of the plane.
Answers
thats a hella slow plane
A few panthers decide to roam around Castroville. They start in the valley then travel 150m [N]. 275m [S] and then 200 m [N].
a. Calculate the total distance covered by the pack.
b. What is the final position of the pack relative to where it started?
Answers
Despite their darkness, their lustrous dark fur coat can make them difficult, if not impossible, to spot. Panthers have small heads, powerful jaws, and emerald green eyes. Their hind legs are often larger and slightly longer than their front legs.
What are the characteristics of panther?The ability to remain undetected is one of the main ways that panthers differ from other big cats. Panthers hunt at night since they are nocturnal.
Therefore, They can blend in with their surroundings thanks to their dark fur, and their keen eyesight and nose make it easier for them to find their prey.
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If a police car is travelling towards you what effect does this have on the police
siren?
Answers
Answer:
well they make the siren go beacaus eyou are doing somthing wrong so what were you thinking
Explanation:
A CFL bulb has an efficiency of 0.42 and a imput of 14W. what is the output power
I really need help.
Answers
Answer:
The output power is 5.88 W.
Explanation:
We have,
Efficiency of CFL bulb is 0.42
Input power is 14 W
It is required to find the output power. The ratio of output power to the input power is called efficiency. It is given by :
\(\eta=\dfrac{P_o}{P_i}\)
\(P_o=\eta\times P_i\\\\P_o=0.42\times 14\\\\P_o=5.88\ W\)
So, the output power is 5.88 W.
How much work is done in the vertical direction if 125 N of force is needed to hold an object at shoulder height as a person walks 2 m forward
Answers
Work is the product of force multiplied by the distance moved, but since the distance moved in the vertical direction is zero
Work Done = 0 joules
Given data
Force = 125N
Horizontal Distance = 2 m
Vertical distance = 0 m
Formula for workWork = Force * Distance
Solution
substitute the given information
Work Done in the horizontal direction= 125*2
Work Done = 250 Joules
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If it takes e = 91.9 mj of energy to separate q = 2.91 c of charge, what is the resultant voltage?
Answers
The resultant voltage is calculated as 0.315 V
CalculationIt is given that
E = 91.9 mj
Q = 2.91c
V = E/Q
=91.9 x \(10^{-3}\) / 2.91
= 31.58 mV
= 0.03158 V
Thus, the resultant voltage is calculated as 0.315 V
What is Voltage?The difference in electric potential between two points, which is defined as the work required per unit of charge to move a test charge between the two points, is known as voltage, electric potential difference, electric pressure, or electric tension.
Voltage can also be described as the pressure from an electrical circuit's power source that helps to push the charged electrons (current) through a conducting loop, that enables them to do work such as illuminating a light.
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Which statement about the mass of a falling object is correct? A.It decreases as the object falls. B.It increases as the object falls. C.It is equal to the weight of the object. D.It stays the same as the object falls.
Answers
Answer:
D.It stays the same as the object falls.