sara, who weighs 69 kg, is on a guilt trip after eating a 838-calorie (838 kcal) breakfast of pancakes loaded with fruits, cream, and syrup. she decides to work out before going to her weekly weight-watchers' meeting. if the height of a single stair is 12 cm, and her body is only 27% efficient in converting chemical energy to mechanical energy, determine the number of stairs sara must climb to cancel out the calories consumed.
Answers
The number of stairs Sara must climb to cancel out the calories consumed is 11667 stairs
How do I determine the number of stairs?To obtain the number of stairs Sara much climb, we'll begin by obtained the total height. This can be obtained as follow:
Mass (m) = 69 KgEnergy consumed = 838 Kcal = 838 × 4184 = 3506192 JPercentage conversion = 27%Mechanical energy (E) = 27% × 3506192 = 946671.84 JAcceleration due to gravity (g) = 9.8 m/s² Total Height (h) = ?E = mgh
946671.84 = 69 × 9.8 × h
946671.84 = 676.2 × h
Divide both sides by 676.2
h = 946671.84 / 676.2
h = 1399.99 m
Finally, we shall determine the number of stairs. Details below:
Total height = 1399.99 m = 1399.99 × 100 = 139999 cmHeight of one stair = 12 cm Number of stairs =?Number of stairs = Total height / height of one stair
Number of stairs = 139999 / 12
Number of stairs = 11667 stairs
Thus, the number of stairs is 11667 stairs
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Related Questions
A book falls off a shelf.
When is the kinetic energy of the book the highest?
A. when it has just started to fall
B just before it strikes the ground
C after it has hit the ground and stoped
D when it was sitting of the shelf
Answers
Answer:
B) Just before it strikes the ground.
Explanation:
The kinetic energy of the book is the highest right before it hits the ground because all of the stored potential energy the book had on the shelf is converted to kinetic energy right at the bottom of the shelf (but before it hits the ground, otherwise, the KE would be 0 because the book would have zero velocity).
Answer:B just before it strikes the ground
Explanation:
Find “d” in the following figure
Answers
Answer:
16 m
Explanation:
Given:
v₀ = 4 m/s
a = 4 m/s²
t = 2 s
Find: Δx
Δx = v₀ t + ½ at²
Δx = (4 m/s) (2 s) + ½ (4 m/s²) (2 s)²
Δx = 16 m
A car changes its velocity from 40.0 m/s to -5.0 m/s in 5.0 seconds what was the car average acceleration
Answers
Answ40x-50 =2334
Explanation:
idk
help please
Match the EM wave type to the correct description.
Answers
2) a with 2
3) c with 3
4) f with 4
5) d with 5
6) b with 6
The letters refer to the EM wave types
in a double-slit experiment, the slit separation is 2.0 mm , two wavelengths of 900 nm and 700 nm illuminate the slits, the screen is placed 2.6 meters away from the slits. at what distance from the central maximum on the screen will a dark fringe from one pattern first coincide with a dark fringe from the other?
Answers
Distance from the central maximum on the screen will a dark fringe from one pattern first coincide with a dark fringe from the other is -0.26 mm
How is the distance calculated?Since the slit separation is 2.0 mm , and two wavelengths, 900 nm and 700 nm , illuminate the slits. A screen is placed 2.6 m from the slits
λ\(1\) = 900 nm
λ\(2\) = 700 nm
D = 2.6 m
d = 2 mm
The distance is calculated using formula ,
\(Y\)= λD/d
Hence,
\(Y1\) = λ\(1\) D/d
\(Y2\) = λ\(2\) D/d
\(Y1\) = 900 × \(10^{-9}\) × 2.6 / 2 × \(10^{-3}\)
Therefore, \(Y1\) = 1.170 mm
\(Y2\) = 700 × \(10^{-9}\) × 2.6 / 2 × \(10^{-3}\)
Therefore, \(Y2\) = 0.910 mm
So the spacing between these two bright stripes is: \(Y2\) -\(Y1\) = -0.26 mm
What is double-slit experiment?Young's double-slit experiment uses two coherent light sources spaced apart. Usually only a few orders of magnitude larger than the wavelength of light are used. Young's double-slit experiment helped us understand the wave theory of light.
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The tape timer used in this experiment marks the paper tape with dots at fixed time intervals. How does it do that?.
Answers
The ticker tape is pulled through the timer once it's powered, which creates a dot along the length of this paper tape at fixed time intervals.
What is a ticker timer?A ticker timer can be defined as a scientific apparatus that is designed and developed to measure time in seconds. Thus, a ticker timer can be used to measure short intervals of time by making dots on a paper tape at regular (fixed) intervals.
By design, a ticker timer comprises a magnet, carbon paper disk and a ticker tape which is pulled through the timer once it's powered, so as to create a dot along the length of this paper tape at fixed time intervals.
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consider the photoelectric effect experiment. in one experiment yellow light shines on a piece of potassium metal. a current is measured meaning electrons are ejected from the potassium metal. what would happen if the intensity of the yellow light increased
Answers
Explanation:
If the intensity of the yellow light increased, meaning more photons will strike the Potassium metal per unit area. This will cause more ejection of electrons from the metal and hence, the strength of current will also increase as we know that
I = Q/t, as the charge increase , the current will also increase.
in the phoenix area, electricity rates rabge from 8 cents per kilowatt-hour (winter) to 11.5 cents per kwh (summer). how much does the energy cost each month to run the refridgerator
Answers
The monthly energy cost to run the refrigerator is approximately $7.02.
To determine the monthly energy cost to run a refrigerator, we need to know the power consumption of the refrigerator and the number of hours it operates per month.
The power consumption of the refrigerator is usually stated in watts (W). If you know the power consumption in watts, you can convert it to kilowatts (kW) by dividing by 1000.
Let's assume the power consumption of the refrigerator is 100 watts (0.1 kW), and it operates for an average of 24 hours per day. In a month, there are typically 30 days.
To calculate the energy consumption in kilowatt-hours (kWh) per month, multiply the power consumption in kilowatts by the number of hours of operation per month:
Energy consumption = Power consumption (kW) x Operating hours per month
Energy consumption = 0.1 kW x 24 hours/day x 30 days
Energy consumption = 72 kWh
Now, we can calculate the cost of energy for running the refrigerator. Since electricity rates range from 8 cents/kWh (winter) to 11.5 cents/kWh (summer), we'll use an average rate of 9.75 cents/kWh for this calculation.
Monthly cost = Energy consumption (kWh) x Electricity rate (cents/kWh)
Monthly cost = 72 kWh x 9.75 cents/kWh
Monthly cost ≈ $7.02
Therefore, the monthly energy cost to run the refrigerator is approximately $7.02.
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When the system is at equilibrium what usually happens? what does at equilibrium even mean?
Answers
When a system is at equilibrium, it means that the forward and backward reactions are occurring at equal rates, resulting in no net change in the concentration of reactants and products.
At this point, the system is considered to be stable and there is no driving force for the reaction to continue in either direction. This state is often represented by the equilibrium constant (Kc), which is a ratio of the concentrations of products and reactants at equilibrium. The specific value of Kc indicates how much of each species is present at equilibrium and can be used to predict the direction of a reaction under different conditions.
Overall, reaching equilibrium is an important concept in chemical reactions as it allows scientists to understand and manipulate the behavior of a system for various applications.
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Jan is holding an ice cube. What causes the ice to melt?
Thermal energy from the ice is transferred to the air.
Thermal energy from Jan’s hand is transferred to the ice.
The air absorbs thermal energy from Jan’s hand.
Jan’s hand absorbs thermal energy from the ice.
Answers
The ice melts because Thermal energy from Jan’s hand is transferred to the ice.
What is thermal energy?Thermal energy is the energy due to temperature difference.
Thermal energy flows from hotter to colder bodies.
The ice Jan is holding melts because heat is transferred from his hands t the ice.
In conclusion, thermal energy flow causes melting.
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Answer:
its b
Explanation:
because the heat from your hand makes the ice melt!
why is soil considered an interface within the earth system?
Answers
Soil is a place where various system components come together to communicate. Where the ground, atmosphere, hydrosphere, and biosphere converge is where soil develops.
What makes soil a system, and why?
A dynamic ecology, the soil system has inputs, outputs, storages, and flows. The primary productivity of a region is influenced by the quality of the soil.
Even though soil only makes up about 10% of the Earth's surface, it is an extremely valuable natural resource that has a significant impact on every other component of the environment. In addition to offering physical support, water, nutrients, and air for plant development, soils are versatile, open habitats. The huge community of bacteria and fungi that recycle chemical elements, particularly carbon and nitrogen, as well as toxic elements, is another feature of soils.
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Calculate the average kinetic energy of the cup for the 100 mL and 400 mL masses.
show the work please
Answers
Answer:
169ml
Explanation:
A scientist counts the number of bacteria colonies growing in each of six lab dishes. why is 13 considered to be the mode of this data set? it is the most likely number of colonies that would grow in a dish. it is in the center of the range of the number of colonies. it is the data value that appears the most often in the set. it is the ideal number of colonies that the scientist should grow.
Answers
Since it is the data value that appears in the set the most frequently, 13 colonies is regarded as the set's mode. So, C is the best choice.
A collection of bacteria descended from the same mother cell is referred to as a "bacterial colony." A colony is a group of visible microorganisms that have all descended from a single mother cell; as a result, it is a genetically identical clone of bacteria.
The growth pattern of the organism on or on medium is given a lot of consideration when identifying bacteria and fungi. The most frequent number, or the one that appears the most frequently, is referred to as the mode.
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In a hockey game, an 80kg player skating at 10m/s overtakes and bumps from behind a 100kg player who is not moving. As a result of being bumped from behind, both players stick together. What is their final velocity (speed and direction) after the bump?
Answers
Answer:
80kg×100kg/10=800. Better than nothing
Please help AP Physics!!!
A simple pendulum consists of a sphere tied to the end of a string of negligible mass. The sphere is pulled back until the string is horizontal and then released from rest. Assume gravitational potential energy is zero when the sphere is at its lowest point. What angle will the string make with the horizontal when the kinetic energy and the potential energy of the sphere-Earth system are equal?
Greater than 45°
Equal to 45°
Less than 45°
It cannot be determined without knowing the mass of the sphere.
Answers
Answer:
Explanation:
Less than 45!
The angle that the string will make horizontally while Kinetic Energy and Potential Energy being equal of the sphere-Earth system would be:
C). Less than 45°
Given that,
Gravitational potential energy = 0
Mass = negligible
Since the body is released from the state of rest and the sphere is present its lowest point, the angle(θ) that it creates would be :
\(mgh =\) \(\frac{1}{2} mv^2\) (\(v = L,\) θ)
θ = less than 45°.
θ < 45°
Thus, option C is the correct answer.
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how to use the time allocated effectively in an examination
Answers
Answer: no se
Explanation:no se
A large pendulum swings in the lobby of the United Nations building in New York City. The pendulum has a 91-kg gold-plated bob and a length of 22.9 m. Assume g = 9.81 m/s2.
Part A
How much time does it take for the bob to swing from its maximum displacement to its equilibrium position?
Express your answer to three significant figures and include the appropriate units.
Answers
Answer:
t = 2.40 s
Explanation:
It just told me
A balloon is rubbed against a sweater. Which of the following describes the result of this interaction?(1 point)
The outer shell electrons move from the balloon to the sweater.
The fibers of the sweater lose electrons.
The balloon becomes positively charged.
The free electrons in the balloon decreases.
Answers
Fibers of the sweater lose electrons because electrons are leave it.
One of the ways of charging a body is by friction. Charges are transferred from one body to another when an object is rubbed against another. This is charging by friction.
A sweater has negative charges hence when the balloon is rubbed against the sweater, fibers of the sweater lose electrons because electrons are leave it.
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Emilio pushes a 100 kg freshman with 200 N of force. How much is the freshman accelerated?
Answers
Explanation:
F = MA
200 = 100 * A
A = 200/100
A = 2m/sec^2
hope it helps youWhen a planet's orbit takes it closest to the Sun, its called:________.
Answers
Answer:
perihelion
Explanation:
The point at which a planet is closest to the sun is called perihelion. The farthest point is called aphelion
Determine the image distance and image height for a 5.00 cm tall object placed 45.0 cm from a double convex lens with a focal length of 15.0 cm.
Answers
Given,
object distance = Given that, an object placed 45.0 cm from a convex lens having a focal length of 15.0 cm
and the height of the image is 5.0 cm
we know,
\(\begin{gathered} \frac{1}{f}=\frac{1}{v}-\frac{1}{u}\frac{}{} \\ \\ \frac{1}{15}=\frac{1}{v}-\frac{1}{-45} \\ \\ \frac{1}{v}=\frac{1}{15}-\frac{1}{45} \\ \\ \frac{1}{v}=\frac{2}{45} \\ \\ \therefore\text{ v=22.5cm} \end{gathered}\)we know,
\(\begin{gathered} \frac{h_i}{h_o}=\frac{v}{u} \\ \\ \frac{\begin{equation*}h_i\end{equation*}}{5}=\frac{22.5}{-45} \\ \\ h_i=-2.5cm \end{gathered}\)result,
image distance = 22.5cm towards right side of convex lens .
image height=2.5cm, {Enlarged and inverted}
Write a letter to Dr. Flores in the space below.
Word Bank
attraction adding energy freedom of movement gas
kinetic energy liquid molecules phase change
removing energy solid speed
Answers
The procedure of the formal letter starts with your Name, Contact Information, and Date followed by the Recipient's Name and Contact Information. After this, the greeting and the body of the letter are prepared.
What is a Letter?In literature, a letter may be characterized as a kind of non-fictional written, typed, or printed communication. These are usually written to facilitate communication between two individuals and are usually sent to the recipient via mail or post in an envelope.
From XYZ,
To Dr. Flores.
Subject: Discuss the principle of Kinetic energy "an energy of motion"
Respected sir,
The roles of kinetic energy and molecular attraction in phase change by completing a hands-on activity, and exploring the Simulation. After all the solid has melted, once again, the heat added goes to increasing the kinetic energy (and temperature) of the liquid molecules until they boil.
A phase change is a process of a substance gaining or losing energy so that molecules or atoms either come closer together or become farther. It also involves the freedom of movement of the gaseous particles when there is the process of phase change successfully accomplished.
Therefore, a letter to Dr. Flores is well written in a proper format.
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A child and sled with a combined mass of 26.3 kg slide down a frictionless hill. The sled starts from rest and acquires a speed of 5.34 m/s by the time it reaches the bottom of the hill. What is the height (in m) of the hill?
Answers
Answer:
12 m/s
Explanation:
5. The temperature of air in a foundry increases when molten metals cool and solidify. Suppose 4.5 x 10^7 J energy is added to the surrounding air by the solidifying metal. The air's temperature increases by 55°C and the air has a specific heat capacity of 1.0 × 10 J/kg °C. What is the mass of the heated air?
Answers
The mass of the heated air is 2475000 kg.
What is specific heat capacity?The heat capacity of a sample of a substance is equal to the mass of the sample divided by the specific heat capacity of the substance (symbol c) in thermodynamics.
Informally, it is the quantity of heat that must be added to one unit of a substance's mass in order to raise its temperature by one unit.
The specific heat capacity of air = 1.0 × 10³ J/kg °C.
Hence, the mass of the heated air is =
( 4.5 x 10⁷ × 55) ÷ ( 1.0 × 10³ ) kg
= 2475000 kg.
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3. A current of 6.0 amperes flows through a light bulb when the voltage
difference between the ends of the filament are 110 volts. What is the
resistance?
Answers
Answer:
18.3Ω
Explanation:
Resistance can be found using the formula:
Resistance = \(\frac{Voltage}{Current }\)
Voltage = 110 volts
Current = 6.0 amperes
∴ Resistance = \(\frac{110}{6}\)
= 18.3 Ω ( to nearest 3 significant figures)
What kind of proof is required when disproving old ideas?
A.
Experimental evidence that supports the new idea
B.
Survey results that show popular support for the new idea
C.
Peer review that does not support the new idea
D.
A well-stated hypothesis that shows the new idea can be tested
Answers
Experimental evidence that supports the new idea
So today I thought i was famous but when i looked at my ceiling i realized i didnt have any fans
Answers
Answer:
...wow...
interesting
a. How far does a 100-newton force have to move to do 1,000 joules
of work?
b. An electric hoist does 500 joules of work lifting a crate 2 meters. How
much force does the hoist use?
c. An athlete does one push-up. In the process, she moves half of her body
weight, 250 newtons, a distance of 20 centimeters. This distance is the
distance her center of gravity moves when she fully extends her arms. How
much work did she do after one push-up?
d. You decide to push on a brick wall with all your might for 5 minutes. You
push so hard that you begin to sweat. However, the wall does not move. If
you end up pushing with a force of 500 newtons, how much work did you
do?
Answers
Work done by a force is given as the product of force and the distance moved by the force.
What is work done?Work done is the product of force and the distance moved by the the force.
Work done = Force × distanceThus, distance required by the 100 N force is given as:
Distance = work done/forceDistance = 1000/100 = 10 m
Distance to be moved is 10 m.
Force applied = work done/ distance
Force applied by the hoist = 500/2
Force applied by the hoist = 250 N
Distance moved in one push-up = 25 cm = 0.25 m
Work done by the athlete after one push-up = 250 × 0.25 m
Work done by the athlete = 62.5 J
Distance moved by the force = 0 m
Work done = 500 × 0 = 0 N
Therefore, for work to be done, force has to move a distance.
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During exercise, the amount of ____________ carried in the blood to the muscles increases. (3 points)
oxygen
carbon dioxide
energy
calories
Answers
Answer:
oxygen
Explanation:
ok buddy
Witch action is designed to increase the safety of a person carrying a microscope from one place to another
Answers
Answer: Microscope is an instrument that is used for observing micro particles, cells, and nanosized particles.
Explanation:
Placing one hand below the stage of the microscope and other hand must be used to hold the arm of the microscope. This facilitates the safety of the microscope as it will provide support to the entire structure of the microscope and also to the lens and mirrors attached to the structure of the microscope. If any of the part get damaged or lost during carrying it will affect the overall functioning of the microscope.
Answer:
wrapping the electrical cord around the arm of the microscope
Explanation:
just took the test