Arunner has a speed of 23 m/s. They see the finish line and speed up to 27 m/s. This happens in 5 seconds. If the runner has a mass of 78 kg, with what force did the
runner cross the finish line? Show all work to receive full credit.
Type your answer.
Answers
Have a great day
Related Questions
As you move from the top atmospheric layer toward the center of a gas planet, the temperature ________ and the pressure ________.
Answers
As you move from the top atmospheric layer toward the center of a gas planet, the temperature increases and the pressure increases as well.
In gas planets such as Jupiter and Saturn, the atmosphere gradually becomes denser and hotter as you move towards the core. This is due to the increasing pressure and temperature from the weight of the overlying atmosphere pushing down. The temperature increase is also a result of the release of heat from the gas planet's interior as well as the conversion of gravitational potential energy to thermal energy. At the same time, the pressure increases due to the weight of the atmosphere above. This high pressure and temperature at the core of the gas planet creates a unique environment that can lead to the formation of exotic states of matter, such as metallic hydrogen.
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A boy moves down a waterslide from a height of 10 meters. what is his velocity when he hits the water at the bottom of the slide?
Answers
The velocity of the boy when he hits the water at the bottom of the slide is 14 m/s.
Velocity of the boy at the bottom of the slide
The velocity of the boy when he hits the water at the bottom of the slide is calculated from the principle of conservation of energy.
K.E = P.E
¹/₂mv² = mgh
v² = 2gh
v = √2gh
where;
h is height of the boyg is acceleration due to gravityv = √(2 x 9.8 x 10)
v = 14 m/s.
Thus, the velocity of the boy when he hits the water at the bottom of the slide is 14 m/s.
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Hurry up i need help.
The average kinetic energy of the particles of two pieces of iron at the same temperature and mass would be __________.
Question 1 options:
Different
The same
Not equivilent
With in 500 degrees of eachother
Answers
Answer:
The answer would be B) The Same
Explanation:
Not gonna lie I checked my class notes but I figured this would help :)
Good luck!!!
For each pair of vehicles, choose the vehicle that would experience the greatest force of impact in a collision. Type your answer in the column on the right. Remember, Force = mass x acceleration Vehicle A is moving at 35 mph. Vehicle B is moving at 45 mph. Truck X hits a tree. Truck Y hits a wooden fence. Vehicle Y is carrying five passengers. Vehicle C is carrying only the driver. Motorcycle A runs into a haystack. Motorcycle B runs into a concrete divider.
Answers
Answer:
I need help on this tooo
Explanation:
Velocity is a description of an object’s blank
Answers
Velocity is the description of an object's motion from one point to another.
It tells the speed with which the trip is completed, and the direction from the start-point to the end-point. It tells nothing about any twists, turns, loops, bends, or stops along the way.
How does friction affect object acceleration down an incline?
Answers
Friction is the force that acts on the opposite side of direction of force, thus it manages to decelerate an object, so it acts upward along the plane
You run to your girlfriend's house and announce that you were running at a rate of 15 miles per hour. She knows this is not true because she knows
Answers
Answer:how long it took you to get there and the distance between your house and her house
Explanation:
which gives the amount of charge on a certain length of a rod that is uniformly charged?
a. It is the ratio of the length to the linear charge density.
b. It is the product of the length and the linear charge density.
c. It is the ratio of the linear charge density to the length.
Answers
It is the product of the length and the linear charge density.
Linear charge density is defined as the amount of charge per unit length of the rod. Therefore, if we know the length of the rod and its linear charge density, we can easily calculate the amount of charge on that length of the rod by multiplying the two values.For example, if a rod is 2 meters long and has a linear charge density of 5 C/m, the amount of charge on the rod would be:Charge = Length x Linear Charge Density Charge = 2 m x 5 C/m Charge = 10 C .
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The correct answer is b. It is the product of the length and the linear charge density.
The amount of charge on a certain length of a rod that is uniformly charged can be determined by multiplying the length of the rod by its linear charge density. Linear charge density is defined as the amount of charge per unit length, and is expressed in units of Coulombs per meter (C/m). By multiplying the linear charge density by the length of the rod, we can determine the total amount of charge present on the rod. For example, if a rod has a linear charge density of 5 C/m and a length of 2 meters, the amount of charge on the rod would be 10 Coulombs (5 C/m x 2 m = 10 C). Therefore, option b is the correct answer as it describes the relationship between the charge and length of a uniformly charged rod.
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When society gets the most it can from its scarce resources, the outcome is called:
a. equitable
b. efficient
c. normal
d. efficacious
Answers
When society gets the most it can from its scarce resources, the outcome is called is efficiency option - b is correct answer.
What are the scarce resources in society?We live in a world where human needs are limitless, but there is a finite amount of land, labor, and capital available to meet those needs. When deciding how to distribute scarce resources, choices must be made due to the conflict between society's limitless wants and our finite resources.
Efficiency means that society makes the most of its limited resources. Equity refers to the equitable distribution of the advantages of those resources among all of society's participants.
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A machine used in production has an effective capacity of 8,849
and a design capacity of 9,050. If the actual output is 7,407 what
is the efficiency for the machine?
Answers
The machine's efficiency is 81.61%, indicating that it converts 81.61% of the input energy into useful output energy, while the remaining percentage is lost as waste or dissipated in the process.
Determine the efficiency?To calculate the efficiency, we can use the formula:
Efficiency = (Actual Output / Design Capacity) × 100
Given:
Actual Output = 7,407
Design Capacity = 9,050
Substituting the values into the formula:
Efficiency = (7,407 / 9,050) × 100
= 0.817 × 100
= 81.61%
Therefore, the efficiency of the machine is 81.61%.
Efficiency is a measure of how effectively a machine or system is utilizing its available capacity. In this case, the machine has a design capacity of 9,050 units, but it only produced an actual output of 7,407 units.
By dividing the actual output by the design capacity and multiplying by 100, we find that the machine's efficiency is 81.61%. This indicates that the machine is operating at approximately 81.61% of its full capacity.
A higher efficiency percentage would indicate a more optimal utilization of the machine's capacity, while a lower percentage suggests room for improvement in maximizing output.
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13. A geostationary satellite for communications seems to be in a
fixed spot above the equator because it has the same angular
velocity as the earth.
a) Show that if it goes round once a day, its angular velocity
w is a little over 7 x 10-5 rad/s.
b)
Geostationary satellites are placed in orbits of radius
4.2 x 104 m. Use this information to deduce g, the
acceleration of a freely falling body, at this height.
Answers
a) The angular velocity of a geostationary satellite is the same as the angular velocity of the Earth, which is approximately 2*pi radians per day. Therefore, the angular velocity of a geostationary satellite is approximately 2*pi/86400 = 7.27*10^-5 rad/s.
b) The acceleration of a freely falling body is given by the formula g = GM/r^2, where G is the gravitational constant, M is the mass of the Earth, and r is the radius of the orbit. Substituting the values given in the problem, we get g = (6.67*10^-11 N*m^2/kg^2)*(5.97*10^24 kg)/(4.2*10^4 m)^2 = 9.8 m/s^2. This is the same value as the acceleration due to gravity at the surface of the Earth.
What is geostationary satellite?A geostationary orbit is otherwise known as a geosynchronous equatorial orbit. It is a circular geosynchronous orbit 35,786 km in altitude above Earth's equator and following the direction of Earth's rotation.
Therefore, the correct answer is as given above
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fast help me I need help
Answers
Answer:
Pascal
it is derived of force and area
Answer:
none of the above
Explanation:
All of them are derived units
gram shows how entropy varies with temperature for a substance that is a gas at the highest temperature shown. a plot of entropy on the y axis versus the temperature in kelvin on the x axis. the entropy and the temperature are initially 0. as the temperature increases, the entropy increases linearly. at a point some distance from the initial point, the entropy increases as the temperature remains constant. this portion is labeled 1. the entropy then continues to increases linearly as the temperature increases. at a third point some distance from the second point, the entropy again increases as the temperature remains constant. this portion is labeled 2. the entropy then increases linearly again as the temperature increases. segment 2 is larger than segment 1. what process corresponds to the entropy increase along the vertical segment labeled 1? the melting of the solid substance to a liquid. the boiling of the liquid substance to a gas. the warming of the liquid substance to its boiling point. the warming of the gaseous substance to its final temperature. the warming of the solid substance to its melting point.
Answers
Studying the graph of entropy and temperature, we get,
1. The process corresponds to the entropy increase along the vertical segment labeled 1 is The melting point of the solid substance to a liquid.
2. The process corresponds to the entropy increase along the vertical segment labeled 2 is The boiling point of the liquid substance to a gas.
3. The entropy change for segment 2 is larger than that of segment 1 because the difference in entropy between the gas state and the liquid state is greater than the entropy differences between the solid and liquid states.
Entropy: It is a way to gauge how random something is.
Entropy is the measurement of the amount of thermal energy per unit of temperature in a system that cannot be used for productive work. Entropy is a measure of a system's molecular disorder or unpredictability since work is produced by organized molecular motion.
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Three identical resistors can be connected in any combination. It's not necessary to include all three in any
given combination. The number of distinct values of resistance that can be made is
A. two or fewer.
B. three.
C. four.
D. five.
E. six or more.
Answers
The number of distinct values of resistance that can be made is five. So, option D. is correct.
1. Let's represent the resistance of each identical resistor as R.
2. Consider the possible combinations:
a. No resistor connected:
This case doesn't contribute to a resistance value.
b. One resistor connected:
The resistance value is R.
c. Two resistors connected in series:
The resistance value is R + R = 2R.
d. Two resistors connected in parallel:
The resistance value is (R * R) / (R + R) = R/2.
e. Three resistors connected in series:
The resistance value is R + R + R = 3R.
f. Three resistors connected in parallel:
The resistance value is (R * R * R) / (R * R + R * R + R * R) = R/3.
g. One resistor in parallel with two resistors in series:
The resistance value is (R * (R + R)) / (R + (R + R)) = (2 * R) / 3.
3. Count the distinct resistance values: R, 2R, R/2, 3R, R/3, and (2 * R) / 3, which sums to a total of 5 different resistance values.
So, the correct answer is five distinct values of resistance can be made using three identical resistors in any combination. So, option D. is correct.
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What is the force of gravity between Earth (5. 972 x 1024 kg)
and Mars (6. 39 x 1023 kg) when they are at their minimum
distance of 5. 46 x 1010 meters?
O
8. 5 x 1038 N
O 8. 54 x 1016 N
O
4. 66 x 1027 N
Answers
The force of gravity between two objects can be calculated using Newton's law of universal gravitation.
F = G * (m1 * m2) / r^2
where:
F is the force of gravity,
G is the gravitational constant (approximately 6.67430 × 10^-11 m^3 kg^-1 s^-2),
m1 and m2 are the masses of the two objects, and
r is the distance between the centers of the two objects.
In this case, the masses of Earth and Mars are given as:
m1 = 5.972 x 10^24 kg (mass of Earth)
m2 = 6.39 x 10^23 kg (mass of Mars)
The distance between Earth and Mars is given as:
r = 5.46 x 10^10 meters
Substituting these values into the formula, we can calculate the force of gravity between Earth and Mars:
F = (6.67430 × 10^-11) * [(5.972 x 10^24) * (6.39 x 10^23)] / (5.46 x 10^10)^2
Calculating this expression will give us the force of gravity between Earth and Mars at their minimum distance. Let's perform the calculation:
F ≈ 4.66 x 10^27 N
Therefore, the correct answer is approximately 4.66 x 10^27 N.
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A snail at position 3 cm moves to position 20 cm in 8 seconds.
Answers
Answer: 17cm.
Explanation:
The equation you're using is:
Δd = df - di
Which means the change in position is equal to the final position minus the starting position. In this case that works out to 20cm - 3cm = 17cm. We're only interested in how much the snail moved, not how long it took to move, so even though they give a time it actually doesn't matter for this question.
cumulus clouds often indicate a. a dry adiabatic lapse rate. b. a temperature inversion. c. possible turbulence.
Answers
Cumulus clouds often indicate Optiion C. possible turbulence.
Turbulence, associated with thunderstorms, may be extremely risky, having the ability to motivate overstressing of the aircraft or lack of manipulation. Thunderstorm vertical currents can be sturdy sufficient to displace a plane up or down vertically as plenty as 2000 to 6000 ft.
Turbulence is only one type of alternate in the air around your aircraft. Air is not nothingness; it's a fluid, like water. Currents of airflow up and down, ripple out, trade direction, and change speed. some of the things that reason turbulence are simpler to expect.
Turbulence is an unexpected and every-so-often violent shift in airflow. the ones irregular motions within the atmosphere create air currents that may purpose passengers on an aircraft to enjoy stressful bumps throughout a flight, or it is able to be extremely sufficient to throw an airplane out of manage.
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The force acting on a tugboat is described by the vector(6 newtons,–3 newtons). What is the direction of the force in degrees, to thenearest tenth of a degree?
Answers
In order to calculate the direction of the vector, first let's draw its components:
since the horizontal component is positive and the vertical component is negative, the vector is pointing to the 4th quadrant.
To calculate the angle, we can use the arc tangent as follows:
\(\begin{gathered} \tan (\theta)=\frac{-3}{6} \\ \tan (\theta)=-0.5 \\ \theta=\tan ^{-1}(-0.5) \\ \theta=-26.56\degree \end{gathered}\)Rounding to nearest tenth, the direction is -26.6°.
A stunt performer falls off a wall that is 1.6 m high and then lands on a mat.
What is his impact velocity?
A. 5.6 m/s
B. 1.1 m/s
C. 4.7 m/s
o
D. 2.9 m/s
Answers
According to law of conservation of energy,
= ½mv² = mgh
= mv² = 2mgh
= v² = 2mgh/m
= v = √2gh
So, now just put the values of g & h, abd you are done;
= v = √2×9.8×1.6
= v = √31.36
= v = 5.6 m/s
Please help me out!
Answers
When Lorraine puts the tennis ball in the container of olive oil, it will float on the surface of the oil because the density of the tennis ball (970 kg/m³) is less than the density of the olive oil (900 kg/m³).
What is density ?Density is a measure of the mass of a substance per unit volume. It is an important physical property of matter and is used to identify substances, compare the same substances in different states, and measure the concentration of substances in solutions. Density is expressed in terms of grams per cubic centimeter or pounds per cubic foot. Density is also a fundamental concept in the study of fluid mechanics, since the density of a fluid determines its pressure and its behavior when acted upon by external forces.
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A hot air ballon is filled with 2,100m3 air when deflated at 25oC. When fully inflated, the average air temperature inside the balloon is 125oC. What is the final volume of the balloon
Answers
XO
also i ate a apple
Calculate the magnetic force of 10C charged particle which is moving with a velocity of 2m/s in an magnetic field of 0.5T? The direction of magnetic field is same as that of path of the second particle.
Answers
Answer:
i think it is 20.5
Explanation:
compare the two branches of physical science
Answers
Answer:
Well Astronomy is study of stars or planets and chemistry is like potions
Explanation:
1. Why are the outer planets called “gas planets?”
Answers
Answer:
They are also called the gas planets because they consist mainly of hydrogen, or the giant planets because of their size. These planets usually have complicated system of many moons and often even rings of ice and/or dust. There are four Jovian planets in the Solar System: Jupiter, Saturn, Uranus and Neptune.
Answer:
They are also called the gas planets because they consist mainly of hydrogen, or the giant planets because of their size. These planets usually have complicated system of many moons and often even rings of ice and/or dust. There are four Jovian planets in the Solar System: Jupiter, Saturn, Uranus and Neptune.
Explanation:
i hope this helps :)
can the transfer of heat by convection occur in solids ?why?
Answers
Answer:
cannot
Explanation:
because convection occurs to difference in densities between particles and there is a movement of particles during convection ( gases and liquids ) , in solids , atoms are very tightly packed and cannot move
why are cepheid variables so important for measuring distances in astronomy?
Answers
Cepheid variables are crucial for measuring distances in astronomy.
Cepheid variables are a type of pulsating star that undergoes regular changes in brightness over time. The period of their brightness variations is directly related to their intrinsic luminosity, meaning that brighter Cepheids have longer periods.
This relationship, known as the period-luminosity relationship, allows astronomers to use Cepheids as "standard candles" for distance measurements. By measuring the period of a Cepheid and comparing it to its observed brightness, astronomers can determine its intrinsic luminosity and then calculate its distance using the inverse square law.
Since Cepheids are observable in distant galaxies, they serve as reliable distance indicators and have played a vital role in determining the scale of the universe and studying cosmic expansion.
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Cepheid variables are important in astronomy due to their unique period-luminosity relationship allowing astronomers to measure stellar distances. This relation has helped in the discovery of the universe's expansion and breaking the distance confines of parallax, aiding exploration into more distant parts of our Galaxy and others.
Explanation:Cepheid variables are important for measuring distances in astronomy due to their unique period-luminosity relationship. The
period-luminosity relation
states that the longer the period (the time it takes for the star to vary), the greater the luminosity (brightness) of the Cepheid variable star is. This relationship is essential as it allows astronomers to measure the distance of these stars once the period has been determined.
To initially define this relationship with actual numbers, astronomers had to measure distances to a few nearby Cepheids in a different way, typically by finding Cepheids in clusters with stars whose distances could be estimated using spectral analysis. Once this period-luminosity relation was calibrated, it could be used to estimate the distance of any Cepheid, regardless of its location.
Cepheids have become crucial markers in space, acting as cosmic signposts. For instance, in the 1920s, Edwin Hubble used Cepheid variables to discover the expansion of the universe. They have been instrumental in breaking the distance confines of parallax, allowing astronomers to explore more distant parts of our Galaxy and others.
Today, the search continues with modern instruments including the Hubble Space Telescope, identifying and measuring individual Cepheids in galaxies farther and farther away. Some Cepheids are known to be about 60 million light-years away.
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Which image illustrates the bouncing of a light wave off of a surface?
A
B
с
D
A. A
B. B
C. C
Answers
Answer:
The answer is A good luck :P
Answer:
A
Explanation:
The light Bounces off because it is reflecting off glass or anything else
Which of the following is the clearest example of a neuronal membrane’s selective permeability?
a. The Na+-K+ pump only transports Na+ and K+ ions.
b. K+ ions can diffuse across the membrane more easily than Na+ ions.
c. Diffusion of K+ ions out of the neuron causes the membrane potential to become more negative.
d. The concentration gradient for Na+ ions is inward, but the concentration gradient for K+ ions is outward.
Answers
The clearest example of a neuronal membrane's selective permeability is an option (b) - K+ ions can diffuse across the membrane more easily than Na+ ions. This is because the membrane is more permeable to K+ ions than to Na+ ions.
This is due to the presence of potassium ion channels, which allow K+ ions to easily cross the membrane. On the other hand, the presence of sodium ion channels is limited, which makes it more difficult for Na+ ions to cross the membrane.
The selective permeability of the neuronal membrane is crucial for maintaining the proper functioning of the nervous system. It allows for the regulation of ion concentrations inside and outside the cell, which is essential for generating and transmitting electrical signals. This selective permeability is achieved through the presence of ion channels and transporters that selectively allow certain ions to pass through the membrane.
In summary, the clearest example of a neuronal membrane's selective permeability is the fact that K+ ions can diffuse across the membrane more easily than Na+ ions, due to the presence of potassium ion channels and the limited presence of sodium ion channels. Hence, b is the correct option.
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Why did scientists using classical,Newtonian physics gave difficulty explaining the photoeelectric effect?
Answers
Answer:
Classical physics viewed light as a wave.
Explanation:
because classical physics describes light as waves
Name an acid which is highly corrosive and should never be tested by mouth.
Answers
Answer:
We all know that HCI is highly corrosive mineral acid. It's produced naturally in our (Human being) Stomach
It (HCI) is produced by the gastric glands in stomach. HCI activates the enzyme Pepsin and creates an acidic medium which kills the bacteria which might have entered while digestion & also making it simpler for further digestion.
HCI does not harm our stomach because the gastric gland also produces Mucus which helps in preventing the damage of inner wall (layer) of stomach from the action of this Acid.