The answer is c.velocity is speed and direction
Sound moves through the air at a speed of 340 m/s. How long would it take to hear your echo in a canyon which is 50 meters away? Show all of your work with an explanation of your answer.
Answer: 5/17 seconds or roughly .3 seconds
Explanation:
We will hear our echo once it has traversed the canyon to reach the end, bounce off, then return back to our ears.
To find how long it travels in one direction:
[tex]\frac{50m}{340 \frac{m}{s}} = \frac{5}{34} s[/tex] (or about .14 seconds)
For it to return back to us we double that time.
The time for it to reach our ears would be 5/17 seconds or roughly .3 seconds.
A crane lifts an air conditioner to the top of a building. If the building is 12 m high, and the air conditioner has a mass of 200 kg, how much work did the crane do to lift it? (Hint: the force the crane exerts is equal to the weight of the air conditioner)
Work needed = 23,520 J
Further explanationGiven
height = 12 m
mass = 200 kg
Required
work needed by the crane
Solution
Work is the transfer of energy caused by the force acting on a moving object
Work is the product of force with the displacement of objects.
Can be formulated
W = F x d
W = Work, J, Nm
F = Force, N
d = distance, m
F = m x g
Input the value :
W = mgd
W = 200 kg x 9.8 m/s²x12 m
W = 23520 J
A spring has a spring constant k = 20N/cm. What load is needed to produce an extension of 2.5cm?
Answer:
50 N
Explanation:
We are given;
Spring constant; K = 20N/cm
Extension; Δx = 2.5 cm
We want to find the load which is the force. This is gotten from the equation;
F = k•Δx
F = 20 × 2.5
F = 50 N
Therefore the load needed is 50 N.
The woman dries herself with a towel. She hangs the wet towel in the bathroom to dry. Figure 2 shows two places she could hang the towel. The towel will dry faster if it is hung from the unheated towel rail instead of the towel ring. Explain why.
2 points
tail rail holds the towel from a certain way where the water climbs down
on what mass will a force 16N produce an acceleration of 160N
Answer:
m = 0.1 [kg]
Explanation:
To solve this problem we must use Newton's second law, which tells us that the sum of forces on a body is equal to the product of mass by acceleration. In this way, we have the following equation.
[tex]F =m*a[/tex]
where:
F = force = 16[N]
a = acceleration = 160 [m/s²]
m = mass [kg]
Now replacing:
[tex]m=F/a\\m = 16/160\\m = 0.1 [kg][/tex]
Click through the images and select the model that best shows how J.J. Thomson envisioned the atom.
Answer:
The first one with the big plus in the middle and negatively charged electrons around.
Explanation:
The first image with the plus sign in the middle and negatively charged electrons around it shows how J.J. Thomson envisioned the atom.
J.J. Thomson proposed the "plum pudding" model of the atom. This model suggested that atoms were composed of a positively charged "pudding" with negatively charged electrons embedded within it.
1. Thomson conducted experiments with cathode rays, which are streams of negatively charged particles emitted from cathodes in vacuum tubes. Through his experiments, Thomson discovered that cathode rays were composed of negatively charged particles, which he named electrons. Based on his observations, Thomson proposed the "plum pudding" model, also known as the "raisin bread" model.
According to this model, atoms were made up of a positively charged substance, like a pudding, with negatively charged electrons scattered throughout it, like raisins in bread. Thomson suggested that the positive charge was evenly distributed throughout the atom, creating a uniform positive charge in the "pudding." This model was a significant departure from the previous understanding of the atom as an indivisible, homogeneous sphere.
Thomson's plum pudding model provided an early depiction of atomic structure, showing that atoms were not indivisible but composed of smaller subatomic particles. However, later experiments, particularly those conducted by Ernest Rutherford, led to the discovery of the atomic nucleus, which necessitated the revision of Thomson's model.
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4. What is an inherited trait?
Answer:
An inherited trait are features of an organism that can be passed down to one's offspring, for example eye color, hair color shape of the nose etc. They can be passed from generation to the next generation
Answer:
Inherited traits are talents that you have naturally inherited by an ancestor.
Explanation:
Have a great day
HURRY!!! How does a sound wave travel through air?
a. absorption of sound waves
b. traveling by light waves
c. air currents move away from the sound
d. repeating compressions of air particles
Question 11(Multiple Choice Worth 4 points)
(05.03 LC)
HELP ASAP!!! WILL GIVE BRAINLIEST!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
What most likely happens when water vapor cools?
It changes into gas.
It changes into liquid.
Its temperature increases.
Its temperature remains constant.
You would like to know whether silicon will float in mercury and you know that can determine this based on their densities. Unfortunately, you have the density of mercury in units of kilogrammeter3 and the density of silicon in other units: 2.33 gramcentimeter3. You decide to convert the density of silicon into units of kilogrammeter3 to perform the comparison. By which combination of conversion factors will you multiply 2.33 gramcentimeter3 to perform the unit conversion?
Answer:
The fourth one
Explanation:
It's the only one to represent volume (cm³ vs. m³) and have kilograms in the denominator.
Have a wonderful weekend!
If we want to convert the density of the silicon from 2.33 gram/ centimeter3 to kilogram /meter3 unit we have to perform the operation
(1 kilogram/ 10³ grams) ×(1 centimeter/10⁻² meters)×(1 centimeter/10⁻² meters)×(1 centimeter/10⁻² meters)
Therefore the correct answer is option B.
What is density?
It can be defined as the mass of any object or body per unit volume of the particular object or body. Generally, it is expressed as in gram per cm³ or kilogram per meter³.
As given in the problem we have to convert the density of the silicon from 2.33 gram/ centimeter3 to kilogram /meter3 unit
1 kilograms = 1000 grams
1 meter = 100 cm
2.33 gram/ centimeter3 = 2.33×10 ⁻³kilogram / 10 ⁻⁶meter3 unit
= 2.33×10³kilogram / 10 ⁻⁶meter3 unit
Thus, the correct answer is option B.
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difference between light energy and heat energy
Need help with physics please
A 65 kg child riding a Ferris wheel has a tangential speed of 9.5 m/s. Find the magnitude of the centripetal force on the child if the distance from the child to the axis of the wheel is 20 m.
The centripetal force : F = 293.3125 N
Further explanationGiven
mass = 65 kg
v = 9.5 m/s
r = 20 m
Required
the centripetal force
Solution
Centripetal force is a force acting on objects that move in a circle in the direction toward the center of the circle
[tex]\large {\boxed {\bold {F = \frac {mv ^ 2} {R}}}[/tex]
F = centripetal force, N
m = mass, Kg
v = linear velocity, m / s
r = radius, m
Input the value :
F = 65 x 9.5² / 20
F = 293.3125 N
Why would companies want their sunscreen to absorb nearly all of the UV light?
Answer:
Sunscreen is like a shield, you would want a better shield to protect you than a weak one so companies try to make their sunscreen better than the rest.
Explanation: UV light is very dangerous to the skin so it helps with sunburn,skin sensitivity,etc.
How does the energy from the person's hand get to the last domino?
Answer:
woh its really exist?
Explanation:
cakra
The height of the crest or depth of the trough from the center is called *
Answer:
amplitude
Explanation:
Question 4 options: The steps that lead you from dependence to independence are referred to as The _________ to Lifetime Fitness, Health, and Wellness.
Answer:
Stairway.
Explanation:
The steps that lead you from dependence to independence are referred to as the stairway to Lifetime Fitness, Health, and Wellness.
This ultimately implies that, these stairway or steps are very important and essential for all humans who seek Lifetime Fitness, Health, and Wellness.
A good health can be defined as the state of well-being (wellness) in which all of the components of an individual's health are balanced. These state of wellness comprises of six (6) important components and they are;
1. Physical: this is a measure of the state of an individual's body or the way the body functions. It is enhanced by eating right, working out or exercising, avoiding drugs and alcohol, maintaining a good body mass index etc.
2. Emotional: this deals with the state of an individual's mind being void of worries, negativity etc.
3. Social: this involves keeping a good relationship with friends, family and many others around.
4. Environmental: it deals with maintaining a hygienic surrounding, that is devoid of pollutants.
5. Mental or intellectual: avoiding unnecessary stress and anxiety while dealing or coping with the realities of life.
6. Spiritual: it encompasses belief systems, values, ideals, morality etc.
Hence, when an individual is able to balance all of these above mentioned components, then he or she is said to be healthy.
Two 5.0 kilogram objects have different gravitational potential energies. What property of the objects must differ?
Answer:
Height.
Explanation:
Potential energy can be defined as an energy possessed by an object or body due to its position.
Mathematically, potential energy is given by the formula;
[tex] P.E = mgh[/tex]
Where,
P.E represents potential energy measured in Joules.
m represents the mass of an object.
g represents acceleration due to gravity measured in meters per seconds square.
h represents the height measured in meters.
Hence, the property of the object (having a mass of 5 kilograms) which must differ to have different gravitational potential energies is the height from which they are falling from.
The object having the higher height would have a greater gravitational potential energy than the lower object.
What is the current if 4C of charge passes in 2 s?
Answer:
I hope 2 amperes of current passes
Two stoves were turned off at the same time, and they both started to cool down. The following equation gives the temperature of the first stove (in degrees Celsius) as a function of time (in minutes). T = 180-1.55mT=180−1.55mT, equals, 180, minus, 1, point, 55, m The graph of the temperature of the second stove (in degrees Celsius) as a function of time (in minutes) is shown below. Which stove started at a higher temperature?
Answer:
b & b
Explanation:
Two stoves were turned off at the same time, and they both started to cool down.
The following equation gives the temperature of the first stove (in degrees Celsius) as a function of time (in minutes).
T = 180-1.55mT=180−1.55mT, equals, 180, minus, 1, point, 55, m
The graph of the temperature of the second stove (in degrees Celsius) as a function of time (in minutes) is shown below.
Which stove started at a higher temperature?
Choose 1 answer:
Choose 1 answer:
(Choice A, Incorrect)
INCORRECT
The first stove
(Choice B, Checked, Correct)
CORRECT (SELECTED)
The second stove
(Choice C, Incorrect)
INCORRECT
The stoves started at the same temperature
Which stove cooled down at a greater rate?
Choose 1 answer:
Choose 1 answer:
(Choice A, Incorrect)
INCORRECT
The first stove
(Choice B, Checked, Correct)
CORRECT (SELECTED)
The second stove
(Choice C, Incorrect)
INCORRECT
The stoves cooled down at the same rate
B would be correct and so would be on the 2nd part
We are running late for school and we want to make our 0.5 kg tea (it’s at 90 C) colder. Let’s assume we can drink tea when it’s 50 C. We decided that it would be more convenient to drop an ice (0 C) since it will get cold soon. What mass of ice needs to be put in for this to happen?
Answer:
x=0.154kg
Explanation:
(x*L)+(0.5kg*4200*50)+(x*4200*(-50)=0
(x*333 000J/kg*c)+(0.5kg*4200J/kg*C*(-40C))+(x*4200J/kg*C*50C)=0
Light moves from flint glass (n = 1.66) into
water at an angle of incidence of 26.0°.
a) What is the angle of refraction?
Answer in units of º.
b) At what angle would the light have to be
incident to give an angle of refraction of 90.0°
Answer in units of º.
Explanation:
Through Snell's Law, we can solve this.
The formula is:
n1 * sin(theta1) = n2 * sin(theta2)
n1 = flint = 1.66
n2 = water = 1.33
theta1 = 26.0°
theta2 = angle of refraction
Substituting these values in the formula,
1.66 * sin(26) = 1.33 * sin(x)
[1.66 *sin(26)] ÷ 1.33 = sin( x )
0.5471 = sin(x)
arcsin(0.5471) = x
33.17 = x
Therefore, the angle of refraction is 33.17°
b.) Using the same formula, we have:
1.66 * sin(x) = 1.33 * sin(90)
sin(x) = [1.33 * sin(90)] ÷ 1.66
sin(x) = 0.8012
x = arcsin(0.8012)
x = 53.2453°
Therefore, the light needs to have an angle of incident of 53.2453° in order to have a 90° angle of refraction.
Suman with a mass of 45kg climbs in 3m heigh ladder in 10 seconds. Calculate her power. Plz help me
Answer:
work done=fdcosø
f=mg=450N
d=+3m
ø=180
450×3×cos(180°) power=work done/
time taken
1350×-1 p=135watts
Which form of electromagnetic radiation with a relatively high amount of energy is used to sanitize lab goggles?
Answer:
Gamma radiation.
Explanation:
Electromagnetic waves are waves produced with respect to the interaction of electric field and magnetic field. They can be arranged with respect to their increasing or decreasing wavelength to form a pattern called electromagnetic spectrum.
Gamma radiation can be used for sterilization purpose due to the fact that it has a relatively high amount of energy, and do not produce any characteristic radiation.
HURRY PLEASE!!!!!!
If the Earth did not have internal energy, which of the following carbon cycle process would not be possible?
burning fossil fuels
consumption
respiration
rock formation
Answer:
Rock Formation
Explanation:
If Earth did not have internal energy, the carbon cycle process that would not be possible is rock formation. So, the correct option is D.
What is Carbon cycle?The carbon cycle is described as a series of biogeochemical processes through which atoms of carbon or carbon compounds are fixed and utilized within the environment, moving carbon from the atmosphere to the Earth and back against which is carried into the atmosphere.
The main processes associated with carbon cycle include the following:
Respiration.Consumption.Combustion such as burning of fossil fuels.Rock formation.The formation of rock requires only that the Earth have enough internal energy to cause the movement of material around the core and mantle to cause slow but significant changes within the Earth's crust.
Therefore, the correct option is D
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What is the acceleration of a softball if it has a mass of 0.19 kg and hits the catcher's glove with a force of 4.75 N? Answer: m/s2
What are sum fossil fuels?
what is a fossil fuels and what is a example
Answer:
Coal, crude oil, and natural gas are all considered fossil fuels all considered fossil fuels because they were formed from the fossilized, buried remains of plants and animals that lived millions of years ago.
Explanation:
Coal, crude oil, and natural gas are all considered fossil fuels because they were formed from the fossilized, buried remains of plants and animals that lived millions of years ago. A fossil fuel is a natural fuel such as coal or gas, formed in the geological past from the remains of living organisms.
Which renewable energy source is used the most throughout the world?
A. solar energy
B. biomass
C .hydroelectric
D. wind
Answer:
C- hydropower
Answer:
Hydroelectric
Ella Fitzgerald was a singer who was able to shatter a glass with the sound of her voice. Which of the following is the reason she could do this?
Interference
Diffraction
Resonance
Refraction
Answer:
refraction
i think i dont know dont take my answer just take it into consideration
Explanation:
The shattering of glass with the help of sound illustrates an example of resonance. Thus, the correct option for this question is C.
What is Resonance?In physics, resonance may be defined as a type of phenomenon due to which an exterior force of a vibrating system significantly forces another system around it in order to vibrate with greater amplitude at a specified frequency of operation.
According to the context of this question, the resonance produced by the voice of Ella Fitzgerald results in the breaking or shattering of the glass. It exposes the glass to the sound wave that forces or to vibrate and distorts its shape. Physical phenomena like refraction, diffraction, and interference are related to the concept of light.
Therefore, the shattering of glass with the help of sound illustrates an example of resonance. Thus, the correct option for this question is C.
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According to Newton’s third law of motion, when a hammer strikes and exerts force on a nail, the nail...
A)creates a friction with the hammer
B) disappears into the wood
C) exerts an equal force back on the hammer
D) moves at a constant speed
Answer:
C) Exert an equal force back on the hammer
Explanation:
Every action has an equal and opposite reaction
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The ecosystem with the greatest biodiversity is the one that has the greatest–
Group of answer choices
variety of living things.
average annual rainfall.
coverage of land area.
elevation above sea level.
Answer:
A) Variety of Living Things
Explanation:
Biodiversity is defined as the variety of life in the world or in a particular habitat or ecosystem.
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