Answer:
2 sec
Explanation:
time taken = [tex]\frac{v-u}{a} = \frac{12-7}{2.5} = 2[/tex]
A 40-kg person is climbing 3 m up a flight of stairs in 6 seconds. How much power did they exert climbing the stairs?
Answer:
mate i got you
Explanation:
A 40-kg person is climbing 3 m up a flight of stairs in 6 seconds. How much work did they do climbing the stairs? answer choices . 400 J. 1200 J. 200 J. 120 J. Tags: Question 13 . SURVEY . 30 seconds . Report an issue . Q. A 40-kg person is climbing 3 m up a flight of stairs in 6 seconds. How much power did they exert climbing the stairs? answer choices . 400 W. 1200 W. 200 W. 120 W. Tags
200 W was used in climbing the stairs.
We'll begin by calculating the energy. This can be obtained as follow:
Mass (m) = 40 kg
Height (h) = 3 m
Acceleration due to gravity (g) = 10 m/s²
Energy (E) =? E = mghE = 40 × 10 × 3
E = 1200 JFinally, we shall determine the power exert in climbing the stairs. This can be obtained as follow:
Energy (E) = 1200 J
Time (t) = 6 s
Power (P) =?[tex]Power = \frac{Energy }{Time}\\\\Power = \frac{1200}{6}[/tex]
Power = 200 WThus, 200 W was used in climbing the stairs.
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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
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
Learn more about Rock cycle, here:
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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
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.
How could a camping fire turn into a forest fire
Answer:
Campfires top the list of ways that humans start wildfires, the U.S. Forest Service said. Typically, campfires either grow out of control and the people who built the fire do not have a way to stop it, or they fail to extinguish the fire properly, allowing the fire to re-ignite after they leave.
Explanation:
Answer:
Explanation:
Wind can blow the ashes and ignite the leaves
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.
What is the current if 4C of charge passes in 2 s?
Answer:
I hope 2 amperes of current passes
Pls, help with this! I'm having trouble. will give points!!
Answer:
yes
no
no
no
no
yes
Explanation:
If a object is at rest, does it mean there are no forces acting on it
The height of the crest or depth of the trough from the center is called *
Answer:
amplitude
Explanation:
these two pls :)))) ill mark brainliest :)
Answer:
Bowling Ball: weight on Earth = 49 N
Textbook: Mass = 2 kg; weight on the moon = 3.2 N
Large dog: weight on Earth = 490 N; weight on the moon = 80 N
Law of Universal Gravitation: [tex]F_{G}=\frac{Gm_{1}m_{2}}{r^{2}}[/tex]
[tex]F_{G}[/tex] = gravitational force (Newtons/N)
G = gravitational constant, 6.67430 × 10¹¹ [tex]\frac{N*m^{2}}{kg^{2}}[/tex]
m₁ and m₂ = masses of two objects (kilograms/kg)
r² = square of distance between centers of the two objects (meters/m)
Have a fantastic day!
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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How does the energy from the person's hand get to the last domino?
Answer:
woh its really exist?
Explanation:
cakra
What is the difference between speed and velocity?
a.Speed is displacement and time
b.Speed is velocity/ displacement
c.velocity is speed and direction
d.velocity is displacement and distance
The answer is c.velocity is speed and direction
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]
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.
plzzzzzzz helppppppp
Answer:
6th amendment
Explanation:
the judge denied her request for a lawyer when she requested one
5. In an electric bell, electromagnet attracts________
towards itself.
Ans: It attracts iron armature
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.
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
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.
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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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
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
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
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.
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.
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