a football player runs from his own goal line to the opposing team's goal line, returning to his forty-yard line, all in 20.0 s. calculate his average speed and the magnitude of his average velocity. (enter your answers in yards/s.)
Answers
The average velocity would be zero because the player is running from his own goal line to the opposing team's goal line and then returning to his forty-yard line. The displacement is zero.
What is the average ?The average is a measure of the central tendency of a set of numbers. It is calculated by adding all the numbers in the set and then dividing by the number of values in the set. The average can be used to compare sets of data and to draw conclusions about the data. It is often used to measure the overall performance of a group or to identify trends in the data.
Average Speed =
400 yd/20.0 s = 20 yd/s
Average Velocity =
The average velocity would be zero because the player is running from his own goal line to the opposing team's goal line and then returning to his forty-yard line. The displacement is zero since the net change in position is zero. Therefore, the average velocity would be zero.
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Related Questions
Which is generated when a bar magnet is moved through a wire coil?
Answers
Electric current is generated when a bar magnet is moved through a wire coil.
What is produced when the bar magnet is moved in the wire coil?A coil of wire and a magnet can be used to create an electric current. When a magnet moves into a coil of wire, a voltage is created. We refer to this process as electromagnetic induction. When the magnet is repositioned outside of the coil, the direction of the induced voltage is reversed.
The magnetic fields around each loop created when the wire is bent into a coil combine to form a long, thin magnet with north at one end and south at the other. The coil's magnetic field is stronger when current is flowing the more loops it has. A magnet created using only a wire coil is not very powerful.
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A negatively charged balloon touching a wooden wallPulls positive charge on the wall surface toward it Pushed negative charge in a wall away from itPolarizes molecules on the wall All of the above
Answers
Given that the balloon is negatively charged and it is touching a wooden wall, the ballon will perform all the actions given in the answer choices.
A negatively charged balloon will pull positive charge on the wall surface towards it, since opposite charges attract each other.
Also, the negatively charged balloon touching a wooden wall will push any negative charge in the wall away from it. This is because like charges repel each other.
The negatively charged balloon also polarizes the molecules on the wall. This is because in molecules, atoms are bonded together since protons in one atom attract the electrons in the cloud of another atom.
Therefore, the correct choice is All of the above
ANSWER:
All of the above
Car B is traveling a distance d ahead of car A. Both cars are traveling at 60 ft/s when the driver of B suddenly applies the brakes, causing his car to decelerate at 12 ft/s. It takes the driver of car A 0. 75 s to react (this is the normal reaction time for drivers). When he applies his brakes, I dece lerates at 15 ft/s. Determine the minimum distance d be tween the cars so as to avoid a collision
Answers
The minimum gap between the automobiles is 16.9 feet, according to the supplied statement, in order to prevent a collision.
In physics, now what you mean by distance?The size or extent of the displacement between two points is referred to as distance. Keep in mind that perhaps the difference between two and indeed the distance travelled between them are not the same. The length of the entire journey taken to go from one point to another is the distance travelled.
Briefing:For B;
\(\begin{aligned}(\rightarrow) \quad v & =v_0+a_c t \\v_B & =60-12 t \\(\rightrightarrows) & s=s_0+v_0 t+\frac{1}{2} a_c t^2 \\s_B & =d+60 t-\frac{1}{2}(12) t^2\end{aligned}\)
For A;
\(\begin{aligned}& (\stackrel{\rightarrow}{\rightarrow}) \quad v=v_0+a_c t \\& v_A=60-15(t-0.75), \quad[t > 0.75] \\& (\text { 土 }) \quad s=s_0+v_0 t+\frac{1}{2} a_c t^2 \\& \qquad s_A=60(0.75)+60(t-0.75)-\frac{1}{2}(15)(t-0.75)^2, \quad[t > 0.74]\end{aligned}\)
Require \(V_{A} = V_{B}\) the moment of closest approach
60 - 12t = 60 - 15 ( t- 0.75)
t = 3.75 s
The worst case scenario without contact is when \(S_{A} = S_{B}\)
At t = 3.75 s, from eq. (1) and (2),
60(0.75) + 60(3.75 - 0.75) - 7.5(3.75 - 0.75)² = d + 60(3.75) = 6(3.75)²
157.5 = d + 140.62
d = 16.9 ft
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A bike travels at 3.0 m/s, and then accelerates to a speed of
8.5 m/s in a time of 2.5 seconds. The average acceleration of
the bike is
m/s2
Answers
The average acceleration of the bike is 2.2 m/s²
What is average acceleration?Acceleration, rate at which velocity changes with time, in terms of both speed and direction.
A point or an object moving in a straight line is accelerated if it speeds up or slows down.
According to the question,
Given, initial velocity, u=3.0m/s and final velocity v=8.5 m/s
Time = 2.5 seconds
If a be the acceleration.
a = \(\frac{v-u}{t}\)
a = \(\frac{8.5 - 3.0}{2.5s}\)
⟹ a=2.2 m/s²
So, The average acceleration of the bike is 2.2 m/s²
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If a 1000 kg car is traveling at 3
meters per second, what is its
kinetic energy?
Answers
KE= .5 mv^2
KE = .5 * 1000 kg * 3 m’s^2
KE = 4500 kg m^2/s^2
KE = 4500 Joules
Find the total distance a car would travel if it moves 5 km East and then turns and travels 48 km West.
Answers
Answer:
53kmExplanation:
The total distance covered by the car will be the sum total of the distance moved during the journey.
Distance moved towards east = 5 km
Distance moved towards west = 48km
Total distance covered = Distance moved towards east+Distance moved towards east
Total distance covered = 5km+48km
Total distance covered = 53km
Hence the total distance a car would travel if it moves 5 km East and then turns and travels 48 km West is 53km
What is mass formula?
Answers
Answer:
The mass formula is given as
Mass = ρ × v
Where,
ρ = density and
v = the volume
The weight mass formula is given as
m = w / g
Where,
w= weight
m = mass
g = gravity
The mass formula is also given as
m = F / a
If acceleration itself is the gravity, then
M = F / g
Where,
F = force
G = gravity
According to Einstein’s mass-energy relation
m = (E / c2)
Where,
m = mass
E = energy
c = speed of light (3×108 m/s)
The kinetic energy mass formula is given as
K.E = ½ mv2
Where,
m = mass,
v = velocity.
Explanation:
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The molar mass (M) is a physical property and it is defined as the mass of one mole of the chemical substance or it is a ratio of the mass of a chemical compound to its amount of chemical substance. The unit of molar mass is kg/mol. The mass formula is given as. Mass = ρ × v.
A capacitor is made by taking two sheets of aluminum foil, each 0.022 mm thick and placing between them a sheet of paper which comes from a ream of 500 sheets, the ream being 5.5 cm thick with sheets measuring 216 mm by 279 mm. What is the capacitance of the capacitor made this way if the dielectric constant of the paper is 3.7?
THE ANSWER SHOULD BE (18nF)
Answers
The capacitance of the capacitor if the dielectric constant of the paper is 3.7 : 18 nF
Given data :
Thickness of aluminium capacitor = 0.022 mm
Number of sheets = 500
Thickness of ream = 5.5 cm = 0.055 m
measurement of sheets = 0.216 m by 0.279 m
dielectric constant ( k ) = 3.7
Determine the capacitance of the capacitorwe will apply the capacitance formula below
C = Kε₀A / d
= 3.7 * 8.85*10⁻¹² * 0.216 *0.279 / ( 0.055 / 500 )
= 1.8 * 10⁻⁸F ≈ 18nF
Hence we can conclude that The capacitance of the capacitor if the dielectric constant of the paper is 3.7 : 18 nF
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calculate the change in the molar gibbs energy of a perfect gas when its pressure is increased isothermally from 1.0 atm to 100.0 atm at 298 k.
Answers
The shift in a perfect gas's molar consider Carbon dioxide(Co₂) gibbs energy when its pressure rises 1 atm to 100 atm is ΔG = 1.96 kJ/mol
Information is provided gibbs energytemperature = 298K at 100 °C.
Free enthalpy is another name for Gibbs free energy. The energy associated with a chemical reaction needed to carry out work is known as the Gibbs free energy.
ΔG=ΔH-TΔS.The difference between the reaction's enthalpy and its product of changing temperature and entropy yields the Gibbs energy.
Temperature at initial pressure = 1.0 bar = 1 atm
1 atm x final temperature = 100.0 bar
Compute ΔG = RT * ln (Pt / Pi) with the following inputs: R = 8.314 J/K* mol; T = 298 K;Pt = final pressure; and Pi = initial pressure;
ΔG = (1.0/100.0) ln (1.97414 J/mol*K*298 K*ln).
ΔG = 8.314 J/mol*K*298 K*0.693.
1.0 atm ΔG = 1688.5 J/mol = 1.96 kJ/mol
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a typical shooting star in a meteor shower is caused by a ________ entering earth's atmosphere.
Answers
A typical shooting star in a meteor shower is caused by a meteor entering Earth's atmosphere.
A shooting star, also known as a meteor, is caused by a small piece of interplanetary debris, called a meteoroid, entering the Earth's atmosphere at high speed. As the meteoroid enters the atmosphere, it rapidly compresses the air in front of it, creating a shock wave that heats up the meteoroid and the surrounding air.
This produces a bright, glowing trail of ionized gas, which we see as a shooting star. Most meteoroids burn up completely in the atmosphere due to the extreme heat generated by friction with the air molecules. However, if a large enough meteoroid survives atmospheric entry and reaches the ground, it is then called a meteorite. Meteor showers occur when the Earth passes through the debris trail left by a comet or asteroid.
Thus, a typical shooting star in a meteor shower is caused by a meteor entering Earth's atmosphere.
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If the light from a galaxy fluctuates in brightness very rapidly, the region producing the radiation must be... A. very large. B. very small. C. very hot. D. rotating very rapidly.
Answers
If the light from a galaxy fluctuates in brightness very rapidly, it suggests that the region producing the radiation is very small. The rapid fluctuations indicate a compact emission source within the galaxy. Therefore, the correct answer is B. very small.
1. Rapid fluctuations in brightness: When the light from a galaxy fluctuates rapidly in brightness, it means that the intensity of the emitted radiation is changing quickly over short time intervals.
2. Relationship to the size of the region: The speed at which the fluctuations occur provides information about the size of the region producing the radiation. If the fluctuations are happening rapidly, it suggests that the region responsible for the emission must be very small.
3. Compactness of the emission source: A small-sized region implies that the emission is coming from a compact source within the galaxy. This could be due to various factors such as a small and dense object, a localized burst of activity, or a highly energetic event occurring within a confined area.
Therefore, when the light from a galaxy fluctuates in brightness very rapidly, it indicates that the region producing the radiation must be very small. This helps astronomers infer the nature of the emission source and the processes occurring within the galaxy.
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20 kg rodsis on the edge of a 80 m high de What is the rodes gracional potencial energy?
Answers
Answer:
Gpe = 15680 Joules
Explanation:
Gravitational potential energy (GPE) is an energy possessed by an object or body due to its position above the earth.
Mathematically, gravitational potential energy is given by the formula;
G.P.E = mgh
Where;
G.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.
Given the following data;
Mass = 20 kg
Height = 80 m
We know that acceleration due to gravity is equal to 9.8 m/s²
To find the gravitational potential energy;
Gpe = mgh
Gpe = 20 * 80 * 9.8
Gpe = 15680 Joules
Drugs that slow brain and body activities are called
A. hallucinogens.
B. stimulants.
C. depressants,
D. over-the-counter.
Answers
The rate of increase of the Earth's gravity field at latitudes 30° and 60° are in the ratio
Answers
Answer:
1 : 2 (30 : 60)
Explanation:
The rate of increase of the Earth's gravity field at latitudes 30° and 60° are in the ratio 1 : 2 because 30 : 60 simplified is 1 : 2.
If the answer does not ask for the ratio to be simplified leave its as 30 : 60.
How is the magnitude of a force represented on a free body diagram?
Answers
Answer:
The length of the vector.
Explanation:
Forces are typically represented by vectors, which is an arrow in laymen’s terms. Vectors have a direction and a magnitude. The magnitude (or greatness of it) is shown by the length. The arrow represents the direction.
The magnitude of force as a vector is represented by the length of vector.
Whenever we need to represent any physical quantity (let us say force), then often need to parameters, first is magnitude and second is direction. The magnitude is a numerical value that determines the exact amount and direction determines the path or way of application.
So to understand the concept of magnitude and direction, the introduction of vectors took place, which says that that a quantity having both the direction and magnitude are called vectors.A vector is represented in such a way that the length of vector denotes the magnitude and the upper arrow on the quantity denotes the direction.Thus, we can conclude that the magnitude of force as a vector is represented by the length of vector.
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assume an inductor is connected to a 180-v ac line and the inductor has an induced voltage of 120 v. how many volts are there to push current through the wire resistance of the coil?
Answers
Assuming an inductor is connected to a 180-v ac line and the inductor has an induced voltage of 120 v, there are 60 volts available to push the current through the wire resistance of the coil.
To determine the voltage that pushes the current through the wire resistance of the coil, you'll need to consider the voltage across the inductor and the applied voltage from the AC line. Given that the induced voltage across the inductor is 120 V and the AC line voltage is 180 V, you can calculate the voltage across the wire resistance by using the formula:
Voltage across wire resistance = AC line voltage - Induced voltage across the inductor
Voltage across wire resistance = 180 V - 120 V = 60 V
So, there are 60 volts available to push the current through the wire resistance of the coil.
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Is acceleration directly proportional to mass, or is it inversely proportional to mass?
Will give brainliest
Answers
Answer:
The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object
Answer:
It’s actually A) Inversely
Explanation:
If the maximum acceleration that is tolerable for passengers in a subway train is 1.21 m/s2 and subway stations are located 810 m apart, what is the maximum speed a subway train can attain between stations
Answers
Answer:
v = 44.27 m / s
Explanation:
This is an exercise in kinematics since they ask the maximum speed of the train
v² = v₀² + 2 a x
a train departs with zero initial velocity
v² = 2 a x
v = √ 2ax
calculate
v = √ (2 1.21 810)
v = 44.27 m / s
in this solution we have assumed that the train uses the entire distance with acceleration
What is the weight of a girl with a mass of 30 kg on Earth?
N
Use g= 9.81 m/s² and do not include units in your answer.
Answers
The weight of a girl would be 294 N on Earth with a mass of 30 Kg.
Arithmetic operations can also be specified by the addition, subtract, divide, and multiply built-in functions.
+ Addition operation: Adds values on either side of the operator.
For example 4 + 2 = 6
- Subtraction operation: Subtracts the right-hand operand from the left-hand operand.
for example 4 -2 = 2
* Multiplication operation: Multiplies values on either side of the operator
For example 4*2 = 8
The weight on Earth of a girl would be the product of the mass and acceleration due to gravity on Earth
So the required solution would be:
⇒ weight = mass × acceleration due to gravity on Earth
⇒ weight = 30 × 9.8
⇒ weight = 294 N.
Hence, the weight of a girl would be 294 N on Earth with a mass of 30 Kg.
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Help a girl out ?! Plz ill give brainlest
Answers
Answer: A.
Explanation: If you move it from A to D look closely its a straight line.
what produces magnetic fields
Answers
Answer:
B is the answer
Explanation:
Magnetic fields are produced by moving electric charges and the intrinsic magnetic moments of elementary particles associated with a fundamental quantum property, their spin.
Magnetic fields are produced by moving electric charges and the intrinsic magnetic moments of elementary particles associated with a fundamental quantum property, their spin. As Ampere suggested, a magnetic field is produced whenever an electrical charge is in motion. The spinning and orbiting of the nucleus of an atom produces a magnetic field as does electrical current flowing through a wire. The direction of the spin and orbit determine the direction of the magnetic field.
If the crest of one wave overlaps the crest of
another, and both waves have an amplitude
of 2 meters, what is the resulting amplitude
when they meet?
Answers
The resulting amplitude when they meet is 4 units.
What is Amplitude?Amplitude is a term used in various fields including physics, engineering, and audio technology, with different meanings in each context. In physics and engineering, amplitude refers to the maximum displacement or magnitude of a wave or oscillation from its rest position. For example, in a sound wave, the amplitude is the maximum displacement of the air molecules from their average position, and it determines the loudness of the sound. In light waves, amplitude refers to the maximum intensity of the light wave, which determines its brightness. In audio technology, amplitude refers to the strength or volume of a sound wave. In digital audio, amplitude is typically represented by a numerical value and is used to control the volume of a sound.
As both are amplitude and one overlaps each other, the amplitude formula doesn't apply, we can simply multiply the waves
2 × 2
= 4
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What..please help me
Answers
Answer:
the answer would be the first choice!
Explanation:
Suppose a small black hole with mass equal to 7.35 × 10^30 kg drifted past Earth at the same distance as the Moon. The mass of the Moon is about 7.35 × 10^22 kg. What might be expected? (Please do not answer if you do not know, this is for a project worth 30% of my grade)
Answers
Answer:
wt f i dont care
Explanation:
Which of the following is the best definition of lifestyle activity?
a
Recreational activities such as bowling or canoeing
b
Light or moderate activities you do as part of your daily life
c
Winter activities such as snowboarding
d
Vigorous activities like a HIIT workout
Answers
please help me
I’m taking a test and I don’t understand this at all
Answers
Answer:
4 CM
Explanation:
The dotted car means thats were it started, the car to the right is were it stops. count the lines from the start of the dotted car to the start of the shaded car. hope that helped!
Two cars each have a mass of 1050 kg. If the gravitational force between them is 2.27 question text :Two asteroids are 75,000 m apart. One has a mass of 8 kg and the other 10 kg. If the force of gravity between them is 1.14 N, what is the mass of the other asteroid? 10-7 N, how far apart are they? G = 6.67 × 10-11 N⋅(m/kg)2
A.
18 m
B.
5.6 m
C.
21 m
D.
33 m
Answers
The mass of the other asteroid is approximately 1.96 × 10^19 kg and the two objects are 5.6 meters (Option B) apart.
The gravitational force equation can be used to resolve this issue:
F = G * (m1 * m2) / r^2
where m1 and m2 are the masses of the two objects, r is the separation between them, and F is the gravitational force. G is the gravitational constant, which has a value of 6.67 10-11 N(m/kg)2.
We have two automobiles with a combined mass of 1050 kg and a gravitational force of 2.27 N for the first portion of the question. The equation can be changed in order to account for r:
G*m1*m2/F is equal to sqrt(r).
We obtain the following by plugging in the values: r = sqrt(6.67 10-11 * 1050 * 1050 / 2.27) = 1.52 metres
As a result, the two cars are 1.52 metres apart.
We have two asteroids with a total mass of for the second portion of the query. mass of 8 kg and 10 kg, respectively, and a force of gravity between them of 1.14 N. We can rearrange the equation to solve for the mass of the other asteroid:
m2 = F * r^2 / (G * m1)
Plugging in the values, we get:
m2 = 1.14 * (75000)^2 / (6.67 × 10-11 * 8) = 1.96 × 10^19 kg
So the mass of the other asteroid is approximately 1.96 × 10^19 kg.
For the last part of the question, we have a force of gravity between two objects of 10^-7 N and we need to find the distance between them. We can rearrange the equation to solve for r:
r = sqrt(G * m1 * m2 / F)
Plugging in the values, we get:
r = sqrt(6.67 × 10-11 * 8 * 10 / 10^-7) = 5.6 meters
So the two objects are 5.6 meters apart. Therefore, the answer is option B.
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the letter R in the world Warm reminds you that warm air does what
Answers
For freely falling objects near earth's surface, _____ is constant.
A
acceleration
B
speed
C
velocity
D
momentum
Answers
The correct option is A. acceleration.
For freely falling objects near Earth's surface, acceleration is constant. An object that is allowed to fall freely under the influence of Earth's gravity is known as a freely falling object. Gravity is an acceleration that acts on any two masses.
For freely falling objects near Earth's surface, the acceleration is indeed constant. This fundamental concept is a result of gravity's influence on objects in free fall. When an object is in free fall, it means that no forces other than gravity are acting upon it. In this scenario, the acceleration experienced by the object remains constant and is equal to the acceleration due to gravity, which is approximately 9.8 meters per second squared (m/s²) near Earth's surface.
The constancy of acceleration in free fall can be attributed to the consistent force of gravity acting on the object. Gravity pulls objects downward towards the center of the Earth, causing them to accelerate uniformly. Regardless of the object's mass, shape, or composition, the acceleration remains constant. This is known as the equivalence principle, which states that all objects experience the same acceleration due to gravity in the absence of other forces.
As an object falls freely, its velocity increases at a steady rate. Each second, the object's velocity increases by approximately 9.8 m/s. This means that in the first second, the velocity increases by 9.8 m/s, in the second second it increases by an additional 9.8 m/s, and so on. The consistent acceleration enables the object to cover greater distances in successive time intervals.
In conclusion, for freely falling objects near Earth's surface, the acceleration remains constant at approximately 9.8 m/s². This constancy arises from the unchanging force of gravity acting on the objects, leading to a uniform increase in velocity over time.
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This theory states that Earth's plates move on top of the mantle at a slow and
constant rate due to convection currents
Answers
Answer:
The theory of plate tectonics proposes that the Earth's outer layer, or lithosphere, is broken up into a number of large plates that interact with one another. These plates are slowly moving across the Earth's surface, driven by convection currents in the mantle below.
The mantle is the layer of the Earth that lies beneath the crust, and it is made up of hot and viscous rock. At certain depths, the mantle rock can become partially molten, and this creates convection currents. These currents are driven by the heat difference between the deeper, hotter parts of the mantle and the cooler, shallower regions.
As these convection currents move, they push against the base of the lithosphere, which is divided into several plates. The interaction between these plates creates a variety of geological features, including mountain ranges, volcanoes, and earthquakes.
The movement of the plates is hardly noticeable in human terms, with rates of movement averaging to just a few centimeters per year. However, over millions of years, these small movements can add up, leading to significant changes in the Earth's geography and climate. For example, the collision of two plates can result in the formation of a mountain range, while the separation of two plates can create a new ocean basin.