A student with a mass of 65.5 kg runs up a flight of 18 stairs. Each of the steps has a height of 16.5 cm. The student was able to reach the top of the stairs in 2.57 s while climbing it 1 stair at a time.

1. Determine the student’s body power

2. If the student changed the number of steps taken in each step (i.e. 2 at a time OR 3 at a time) but nothing else changed, would this change the power of the student? Explain.

3. A Big Mac meal from McDonalds has 4 853 440 J of energy (1160 calories!). Using your answer from number 1, determine how long it would take for you to convert all the energy in a Big Mac meal (if only running stairs at the same rate). Express your answer in minutes.

Answer:

See below ~

Explanation:

Thermodynamics is the branch of science which deals with heat and other forms of energy. Main key terms in this topic include : work, temperature, entropy, etc.

===============================================================

The function of a heat engine is to convert heat into mechanical energy.

It does this by bringing a working substance from a higher state temperature to a lower state temperature.

=============================================================

[tex]e_{max} = W_{max} / Q_{max}[/tex]

- Thermodynamics can be applied to many physical systems, as long as the exchange of energy with the medium is known, regardless of the details of the interactions in those systems.

[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]

According to Charles law, if pressure remains constant, volume varies directly with temperature. so we can infer that :

[tex] \qquad\sf{\dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}} [/tex]

So, we can use this formula to find out the final temperature of the gas ~

Note : Take temperature in Kelvin ( 100°C = 373 K )

[tex]\qquad \sf  \dashrightarrow \: \dfrac{3}{373} = \dfrac{6}{x} [/tex]

[tex]\qquad \sf  \dashrightarrow \: x = \dfrac{6}{3} \times 373 [/tex]

[tex]\qquad \sf  \dashrightarrow \: x = 2 \times 373[/tex]

[tex]\qquad \sf  \dashrightarrow \: x =74 6 \: K[/tex]

Now, convert it to Celsius ~

i.e 746 - 273 = 473° C

So, the final temperature of the gas will be equal to 473° C

Answer:

A to jump

Explanation:

hope this helpes!

1

5

8

3

5

9

there ya go, good luck pal

Answer:

The percent error in his estimation is 30%

Explanation:

Percentage error = |UA- UE| \ UE × 100

UA= Actual value = 7 pounds

UE = Expected value = 10 pounds

Percent error of his estimate = ∣7-10∣ / 10 ×100

= ∣-3∣ / 10 × 100

= 30%

Since dehydration is due to lack of water, sweating excessively is Not a sign of extreme dehydration.

Dehydration is a condition in which the body lack a enough water necessary for metabolic activities.

Dehydration results in extreme physical conditions of the body such as fatigue.

Some signs of extreme dehydration include:

Therefore, sweating excessively is Not a sign of extreme dehydration.

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Answer:

I don't know to be honest

If the resistance decreases to (1/4) of its original value while the voltage remained constant, the resulting current is 8A.

Option D) is the correct answer.

Ohm’s law states that "the potential difference between two points is directly proportional to the current flowing through the resistance.

It is expressed as;

V = I × R

Where V is the voltage or potential difference, potential difference, I is the current and R is the resistance.

Given that the circuit has a current of 2A, this means;

V = 2A × R

Next, the resistance in the circuit decreases to one-fourth of its original amount while the voltage remains constant

V = I' × (1/4)R

So we can equate.

2A × R = I' × (1/4)R

2A × R = I' × R/4

2AR = I'R/4

8AR = I'R

I' = 8AR / R

I' = 8A

If the resistance decreases to (1/4) of its original value while the voltage remained constant, the resulting current is 8A.

Option D) is the correct answer.

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Answer:

drag

Explanation:

drag is the force that acts against any moving object.

if it takes him any amount of time to get from one speed to another, it is caused by drag.

Answer:The role of a hotel manager is an incredibly varied one, and for many leading hotel managers, no two days are ever the same. While this does make the role a hugely inspiring and motivating one, it also means that success requires a very broad set of skills.The best hotel managers are hugely experienced in a wide range of different areas, and have plenty of tips and tricks up their sleeves. From managing budgets to motivating team members, hotel managers need to be able to do it all.Whether you’re an experienced hotel manager looking to brush up on your knowledge, or you’re a budding hospitality team member hoping to rise through the ranks, there are plenty of ways to improve.Focus on skills that develop your leadership potential, and try to gain a more thorough understanding of the most important aspects of your business. Dedicate your time to improving your budgeting skills, understanding how to motivate team members, and ensuring that nothing that happens in your hotel escapes your notice.If you want to put your hotel on the map, you should also be keeping an eye out for emerging trends, and making sure you’re in the know when it comes to all things hospitality. Do this well and you’ll soon be able to spot the next big thing before it happens, and consistently impress both your guests and your team members.Be present in your hotelAll too often we hear of hotel managers so swamped by admin duties that they spend the vast majority of their time in the office. And while hotel managers do need to be at their desks from time to time, neglecting time in the hotel to get ahead on paperwork is often a mistake.Hotel managers need to know their hotel inside out. They need to know how different processes work, how teams interact with each other, and where any problem areas might lie.They need to be able to spot an issue before a guest does and make sure that all team members are fulfilling their duties with the utmost care and attention. And that can’t be done from a desk.A good hotel manager should be spending a considerable proportion of their day in the hotel, observing all that goes on – and talking to guests and staff. There’s no substitute for time spent in the hotel, so make sure you’re present!Motivate team membersThe ability to manage and motivate a team is one of the key responsibilities of a hotel manager, and it’s absolutely essential if the business is to be a success. It’s no secret that a well-motivated team will always outperform an apathetic one, and in hospitality staff motivation really matters.Great leadership skills start with the ability to motivate, inspire and engage. Focus on ways to get staff on board with your ideas, and make sure they’re excited about the future of the business.Give staff opportunities to grow within the business, and retain top talent by providing a clear pathway to promotions, bonuses, and other rewards.

The value of inductance, when N inductor has a peak current of 330 μa when the peak voltage at 44 mhz is 2.8 v, is 8.485×10³ H.

The inductance is the ability or the property of an electric conductor by which it opposes the amount of current flowing from it. It can be calculated with the following formula.

[tex]X_L=\dfrac{V_{rms}}{I_{rms}}[/tex]

Here, V is voltage and I is current value.

N inductor has a peak current of 330 μa when the peak voltage at 44 mhz is 2.8 v. Put the values in the above formula as,

[tex]X_L=\dfrac{V_{rms}}{I_{rms}}\\X_L=\dfrac{2.8}{330\times10^{-6}}\\X_L=8.485\times10^3 \rm \;H[/tex]

Thus, the value of inductance, when N inductor has a peak current of 330 μa when the peak voltage at 44 mhz is 2.8 v, is 8.485×10³ H.

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Answer:

KE = incident energy - work function

The maximum KE will be (3 - .6) eV = 2.4 eV

Answer:

Here is the answer..hope it helps:)

Considering the Charles's Law, the volume change by a factor of [tex]\frac{473 }{298 }[/tex] or 1.587.

Charles's Law consists of the relationship that exists between the volume and the temperature of a certain amount of ideal gas, which is maintained at a constant pressure, by means of a proportionality constant that is applied directly.

In other words, Charles' law states that the volume is directly proportional to the temperature of the gas: if the temperature increases, the volume of the gas increases: while if the temperature of the gas decreases, the volume decreases.

Mathematically, Charles's law is a law that says that when the amount of gas and pressure remain constant, the ratio between volume and temperature will always have the same value:

[tex]\frac{V}{T} =k[/tex]

Considering an initial state 1 and a final state 2, it is true that:

[tex]\frac{V1}{T1} =\frac{V2}{T2}[/tex]

In this case, you know:

Replacing in Charles's law:

[tex]\frac{V1}{298 K} =\frac{V2}{473 K}[/tex]

Solving:

V2=[tex]473\frac{V1}{298 K}[/tex]

V2=[tex]\frac{473 K}{298 K}V1[/tex]= 1.587 V1

Finally, the volume change by a factor of [tex]\frac{473 }{298 }[/tex] or 1.587.

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Answer:

The Mass of an object.

Explanation:

Hope this helped!!

Answer:

I think the answer is C.

Explanation:

the verticale distance of a wave from its crest to its trough

The half-life of a substance is the time the substance takes to decay until the amount of the sample is half of its initial amount.

In this problem, the half-life of iodine-131 is 8 days. This means that after 8 days, only half of the initial sample will be left. After another 8 days (16 days), the sample will be reduced by another factor 1/2, so only 1/4 of the initial sample will be left.

Since the initial sample was 0.96 g, after 16 days the amount of iodine left is m = 1(0.96g) = 0.24g

Answer:

24 days

Explanation:

This is because the half-life is eight days. If you add another half-life, which will be 16 days, 1/4 of the sample remains, and if you add another half-life which is 24 days, 1/8 will remain.

E = mc²

E = 1 x 10⁻⁹ x (3.10⁸)²

E = 9 x 10⁷ J

Answer:

Explanation:

[tex]d=\sqrt{a^{2}+b^{2} } \\where;\\a=10\\b=8[/tex]

Answer:

by the question there is already given a weight of pizza. so its weight is 6kg

Answer:

Choice D

Explanation:

Choice A is incorrect because the sound waves do not form within the body.

Choice B is incorrect because the sound waves echo back, they are not measured on the other side.

Choice C is incorrect because it states that the sound waves bounce off the body. They actually bounce off tissues inside the body, among other things.

Answer:

Explanation:

Answer: Gamma rays

Gamma rays have the highest frequency.

What is an electromagnetic wave?

An electromagnetic wave requires no medium for its propagation.

It consists of a spectrum of different wavelengths.

Different wavelengths of rays have different energies and different frequencies.

Higher frequency rays have the highest energies.

What is gamma-ray?

These are ionized radiations.

Gamma radiations are obtained from the decay of the atomic nucleus.

It has the highest frequency which is why it can penetrate through matter.

It has the smallest wavelength and highest energy.

The frequency of gamma rays is more than 10^19 cycles per second and wavelength less than 100 picometers.

Answer:

Gamma Rays

Explanation:

Each part of the electromagnetic (EM) spectrum comprises photons with distinct energy levels, wavelengths, and frequencies. Gamma rays are the most energetic, have the shortest wavelengths, and have the highest frequencies.

The spring constant will be k= 5.5N/m for a 200g air track glider attached to a spring.

The spring constant, k, is a measure of the stiffness of the spring. It is different for different springs and materials.

Calculation for What is the spring constant

First step is to calculate the time period

T = 12 second/10

T = 1.2 second

Now let calculate the spring constant using this formula

[tex]k=\dfrac{4\pi ^2m}{T^2}[/tex]

Where,

m=0.2kg

T=1.2second

k represent spring constant=?

Let plug in the formula

[tex]k=\dfrac{4 \pi \times 0.2}{(1.2)^2}[/tex]

[tex]k=\dfrac{39.48\times 0.2}{1.44}[/tex]

[tex]k=\dfrac{7.90}{1.44}[/tex]

k=5.48 N/m

k=5.5 N/m ( Approximately)

Therefore the spring constant will be 5.5 N/m

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The final temp of the gold cube will be 30.773 °C. The heat absorption principle is used in the given problem.

The amount of heat required to increase a substance's temperature by one degree Celsius is known as specific heat capacity.

Similarly, heat capacity is the relationship between the amount of energy delivered to a substance and the increase in temperature that results.

Mathematically, specific heat capacity is given by;

\rm Q= Ms \triangle t

Where,

Q is the amount of energy necessary to raise the temperature

M is the mass

Δt is the time it takes to raise the temperature.

s stands for specific heat capacity

While t stands for temperature change.

The given data in the problem is;

The energy required to raise the temperature is 430 joules.

M is the mass of gold = 250 g

s is the specific heat capacity of silver= (0.3 J/°Cg),

ΔT is the temperature fluctuation

The specific heat capacity is given by;

[tex]\rm Q= Ms \triangle t \\\\ \rm 430= 250 \times 0.3 \times (T_f-25)\\\\ T_f=30.773 ^0 C[/tex]

Hence,the final temp of the gold cube will be 30.773 °C.

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Answer:

The frequency is =2⋅10 18 H z

Explanation:

Apply the equation

Frequency

×

Wavelength

=

Speed

f

×

λ

=

c

The wavelength is

λ

=

1.5

⋅

10

−

10

m

The speed is

c

=

3

⋅

10

8

m

s

−

1

The frequency is

f

=

c

λ

=

3

⋅

10

8

1.5

⋅

10

−

10

=

2

⋅

10

18

H

zApply the equation

Frequency

×

Wavelength

=

Speed

f

×

λ

=

c

The wavelength is

λ

=

1.5

⋅

10

−

10

m

The speed is

c

=

3

⋅

10

8

m

s

−

1

The frequency is

f

=

c

λ

=

3

⋅

10

8

1.5

⋅

10

−

10

=

2

⋅

10

18

H

z

Answer:

C.Conflict often occurs over natural resources.

Explanation:

Conflict always occurs if two countries or groups fight over anything that both think is theirs.

UN seems to agree: https://peacekeeping.un.org/en/conflict-and-natural-resources

Answer:

The atmospheric pressure is greatest at the bottom of the atmosphere. This is also where the air has its greatest density. Pressure and density decrease with height in the atmosphere. The earth's gravitational field pulls the mass of the atmosphere towards the earth's surface