(a) The average speed must you have for the second half of the trip to meet your goal is 8 km/h.
(b) The value obtained (8 km/h) is not reasonable for the second half of the distance since the first half is 48km/h.
What is average velocity?
Average velocity is defined as the change in position or displacement (∆x) divided by the time intervals (∆t) in which the displacement occurs.
average velocity = total distance / total time
v = (d)/(0.5d/v₁ + 0.5d/v₂)
where;
v is the average velocityv₁ is the average velocity during the first halfv₂ is the average velocity during the second half90 km/h = (d) / (0.5d/48 + 0.5d/v₂)
90(0.5d/48 + 0.5d/v₂) = d
0.9375d + 0.5d/v₂ = d
d(0.9375 + 0.5/v₂) = d
0.9375 + 0.5/v₂ = 1
0.5/v₂ = 0.0625
v₂ = 0.5/0.0625
v₂ = 8 km/h
Thus, the average speed must you have for the second half of the trip to meet your goal is 8 km/h.
The value obtained (8 km/h) is not reasonable for the second half of the distance since the first half is 48km/h.
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Explain why a car that was driving along a flat surface and is now heading downhill is not in a closed system?
Since an external force now acts on the car as it moves downhill, it is no longer a closed system.
What is a closed system?A closed system is one in which there is no exchange of energy between the system and the external environment. There is usually a boundary that separates the system from the external environment.
When the car was driving along the flat surface, it could continue moving endlessly according to the Newton's first law of motion. If the direction is now changed downhill, an external force now acts on the car and that is the force of gravity.
Since an external force now acts on the car as it moves downhill, it is no longer a closed system.
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S.I unit for moment of inertia of a fly wheel
Answer:
m is expressed in kilograms and r in metres, with I (moment of inertia) having the dimension kilogram-metre square.
A force of 30 N is exerted on a wheeled cart. There is so little friction you can
ignore it. The acceleration of the cart is 6 m/s². Find the mass of the cart.
Answer:
force =mass*acceleration due to gravity
mass=force/acceleration
mass =30/6
mass=5kg
We have 3 gears meshed with the following teeth. A – 20; B – 50; C – 30. Another set of gears have the following teeth. X – 20; Y – 25; Z – 30. Assuming gears A and X are running at the same rpm. Which statement is correct?
gear C and Z will run at the same RPM
RPM is not a unit, according to the International System of Units (SI). The word "revolution" is a semantic annotation rather than a unit, which explains this. RPM formula sign must be f for (rotational) frequency and or for angular velocity due to the measured physical quantity. s−1 or Hz is the basic SI-derived unit that corresponds. The radians per the second unit are used to express angular speed.
As a result, a disc rotating at 60 RPM is considered to be rotating at either 2 rad/s or 1 Hz, where the former refers to angular velocity and the latter to the rate of revolutions per second.
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there is a 100 newtons of air resistance pushing you back and you are pedaling your bike forward with 600 Newtons of force, how much net force do you have moving you?
Answer:
500 N
Explanation:
600 forward netwtons - 100 backwards newtons =
500 net newtons forward
Hypersonic scramjet. On March 27, 2004, the United States
successfully tested the hypersonic X-43A scramjet, which flew at
Mach 7 (seven times the speed of sound) for 11 seconds. (b) How many kilometers
did the scramjet travel during its 11 second test?
25.487 km did the scramjet travel during its 11 second test.
Given that the scramjet travels at a speed seven times that of sound, speed v is equal to 7 x 331 m/s or 2317 m/s.
(A) We require the scramjet's travel time over a distance of
d = 5000 km (5x10^6 m).
Using the formula
time taken = distance traveled/speed,
we can calculate the following:
(5x10^6)/2317 sec
= (5x10^6)/(23175x60) minute
= 5000000/139020 minutes
= 35.97 seconds
As 1 second equals 1/60 of a minute, Therefore, the travel time on Scramjet from San Francisco to New York will be 35.97 minutes.
(B) The distance covered by the Scramjet in 11 seconds must now be determined. as a result,
using speed, distance, and time relation.
Distance = Speed x Time
= 7 x 331 x 11
= 25487 m
Since 1 metre equals 1/1000 of a kilometer, 25487 m of 25.487 km
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A float starts 9.2 m west of a grand stand ( the origin ) for the parade . It heads towards the grandstand at the rate of 1.5m/s . Where is the float located at 3.5s?
The float is 3.95 m west of the grandstand after 3.5 s of its start.
What is Distance in relation with physics?The distance is defined as the total length of the path taken by a moving body in order to reach the final position starting from initial position. Mathematically -
Distance [d] = Speed [s] x time [t]
Given that a float starts from 9.2 m west of a grand stand for the parade with the speed of 1.5 m/s. Therefore we can write -
Speed [s] = 1.5 m/s
Distance between float and grandstand [D] = 9.2 m
The location of the float after 3.5 seconds of its start is as follows-
d = s x t
d = 1.5 x 3.5
d = 5.25
Therefore -
Distance between the float and the grandstand after 3.5 seconds of its start = D - d = 9.20 - 5.25 = 3.95 m
Therefore, the float is 3.95 m west of the grandstand after 3.5 s of its start.
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Kalea throws a baseball directly upward at time t = 0 at an initial speed of 14.3 m/s. How high h does the ball rise above its release point? Ignore air resistance and use g = 9.80 m/s^2.
The ball reaches a height of 9.57 meters against gravity.
The acceleration an object experiences as a result of gravitational force is known as acceleration due to gravity. M/s2 is its SI unit. Its vector nature—which includes both magnitude and direction—makes it a quantity. The unit g stands for gravitational acceleration. At sea level, the standard value of g on the earth's surface is 9.8 m/s2.
A body is drawn toward the center of the earth by the force of gravity. Let's have a look at two bodies with masses ma and mb. When two bodies are subjected to equal forces, the force in terms of mass is given by:
The inertial mass of a body is defined as mb = ma [aA/aB].
In response to the gravitational pull of two bodies,
FA = GMmA/r2,
FB = GMmB/r2,
mB = [FB/FA] × mA
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When water boils, is it steam or water vapor?
Answer:
It is water vapor.
Explanation:
When water boils, it is changing state from a liquid to a gas.
Answer: It is water vapor. When water boils, it is changing state from a liquid to a gas.
Explanation:
A yellow-gold object has a mass of 57.9 g and its volume is 3 cm³. Could the object be made of gold?
Density of gold: 19.3 g/cm³
Yes, the object is made of gold if the yellow object has a mass of 57.9 g and its volume is 3 [tex]cm^{3}[/tex].
Mass of object = 57.9 g
Volume of object = 3 [tex]cm^{3}[/tex]
Also, given density of gold: 19.3 g/[tex]cm^{3}[/tex]
We know that, Density = Mass/Volume
= 57.9/3
=19.3 g/[tex]cm^{3}[/tex]
So we calculated the density from the given data in question.
As the density of gold and the given yellow object is same we can conclude that the object is made of Gold.
It is yellow too which is a property of gold and the density is same as well.
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The diagram below shows how sunlight is radiated back into the Earth's atmosphere as heat (infrared radiation).
A: Conduction
B:Coriolls Effect
C:The Greenhouse effect
D: The global warming effect
The diagram that shows how sunlight is radiated back into the Earth’s atmosphere as heat(infrared radiation) is of the Greenhouse effect.
The greenhouse effect is a natural phenomenon that occurs on Earth and heats up our atmosphere.
The name of this effect is derived from a greenhouse, which is used to grow crops in a special environment.
A greenhouse is basically a house that is made up of glass. The glass allows heat to enter the house but it does not allow the heat to escape to the outside thus keeping the greenhouse warm.
Some gases that are responsible for this effect are known as greenhouse gases. These gases are carbon dioxide, methane, chloro- fluoro carbons, etc.
These gases trap the heat of the sun and raise the temperature of Earth thus causing global warming.
Thus, the diagram that shows how sunlight is radiated back into the Earth’s atmosphere as heat(infrared radiation) is of the Greenhouse effect.
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During a NASCAR race a car goes 50 m/s around a curved section of the track that has a radius of 250 m. What is the car's
acceleration?
Answer:10
Explanation: Acceleration of car is given by a= v^2/r, v= 50m/s, r= 250m a= 10 m/s^2 2
a body of mass 7.5kg is moving with the velocity of 1.2, if a force of 15newton is applied to the body calculate its velocity after 2 seconds
The velocity is 5.2 m/s
Force as per the Newton's second law of motion is defined as, for constant mass, mass times the acceleration
F= m x a
where m is the mass of the body in kilograms and a is the acceleration is m/s^2
Now we know that acceleration is nothing but rate of change of velocity
i.e. a= (v -u)/t
where v is the final velocity
u is the initial velocity
and t is the time frame in which change takes place
Now the data given to us is as follows:
Force F= 15 Newton
initial velocity u =1.2 m/s
t= 2 seconds
We are required to find the final velocity v
Now putting the values in the equation,
F= m (v-u)/t
15 = 7.5 (v-1.2)/2
30= 7.5v -9
7.5v=39
v=39/7.5= 5.2 m/s
Hence the velocity is 5.2m/s
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The actual mass of a metal sphere was reported in the manual catalog to be 3.53 kg.
A group of 4 students were assigned to perform an experiment and measure the mass of the sphere each one of them using a different scale or balance.
Student 1 reported 3.6 kg
Student 2 reported 3.5 kg
Student 3 reported 3.12 kg
Student 4 reported 3.476 kg
Which of the four students reported the most precise measurement?
1. Student 1
2. Student 2
3. Student 3
4. Student 4
The student that gave the most precise measurement is student 2.
What is a precise measurement?A precise measurement is one that is close together especially when we have a replicate measurement. The measurements that are close together are said to be presence. A measurement is accurate when the measurement is quite close to the true value. Precision ad accuracy are very important in a measurement.
In this case, let us consider the measurement of each student;
Student 1 reported 3.6 kgStudent 2 reported 3.5 kgStudent 3 reported 3.12 kgStudent 4 reported 3.476 kgWe can see that the student that gave the most precise measurement is student 2.
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Raoul and Maria set out walking from their aunt's house. Raoul walks a certain distance straight east and then a certain distance straight north. A crow passing overhead starts from the same point as Raoul, but flies in a straight line. Raoul observes that the crow flies a total distance of 500 m in a direction 35° north of east to reach the same final point as Raoul. Maria starts from the same point as Raoul, but she walks first straight west and then straight south. Her final point is 700 m from the starting point in a direction that is 55° south of west. How far did Raoul walk on the east leg of his trip? How far on the north leg? Similarly, how far did Maria walk on the west leg and how far on the south leg? Express these quantities in terms of displacement vectors and their components, using a coordinate system with the +x axis pointing east and the +y axis pointing north.
Answer:
no entiendo tu pregunta
A stunt man drops from a building and falls 15m down onto a giant air mattress
sketch
A) How much time does it take for the stunt man to hit the air mattress?
B) What is his velocity as he slams into the mattress (# and direction)?
PLEASE HELP!!! ASAP
A. The time taken for the stunt man to hit the mattress is 1.75 s
B. The velocity the stunt man as he slams into the mattress is 17.15 m/s
A. How to determine the time taken to hit the mattressHeight (h) = 15 mAcceleration due to gravity (g) = 9.8 m/s²Time (t) =?h = ½gt²
15 = ½ × 9.8 × t²
15 = 4.9 × t²
Divide both side by 4.9
t² = 15 / 4.9
Take the square root of both side
t = √(15 / 4.9)
t = 1.75 s
Thus, it will take the stunt man 1.75 s to hit the mattress
B. How to determine the velocityAcceleration due to gravity (g) = 9.8 m/s²Time (t) = 1.75 sVelocity (v) =?v = gt
v = 9.8 × 1.75
v = 17.15 m/s
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What is the average velocity of a car that travels 12 kilometers in 0.20 hours?
Answer:
60 km/hr
Explanation:
Looking for km / hr
12 km / (.20 hr) = 60 km/hr
I need help with this question , thank you
Answer:
Should be 400m
Explanation:
Determine the horizontal distance, d in meters, between the waiter and the diner at the time the cork reaches where the diner had previously been sitting.
T=3.12 Sec
Distance d= 9.703m
The distance can refer to a physical length in physics or to an estimate based on other factors in ordinary language (e.g. "two counties over"). It is sometimes used to indicate the distance between two points: display style |AB||AB|. The terms "distance from A to B" and "distance from B to A" are frequently used interchangeably.
It is a generalization of the idea of physical distance. Distance is a non-numerical measurement in psychology and the social sciences; psychological distance refers to how an object feels.
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If I stop applying a force to an object, will it continue to accelerate? Why?
Answer:
As long as the force is applied to a given object, it will to accelerate. Once the force is withdrawn, the object will continue to move at a constant velocity, according to the Law of Inertia.
Explanation:
Rattlesnake Frequency A timber rattlesnake (Crotalus horridus) shakes its rattle at a characteristic frequency of about 3100 shakes per minuteWhat is this frequency in shakes per second?
Answer:
See below
Explanation:
31 00 sh / min / 60 s / min = 51 2/3 shakes per second
phys 181 check picture
Answer:
see below
Explanation:
a^3 = 125 m^3
b^2 = 8.41 s^2
c = 45 m/s Plug these values into the equation
125 / ( 8.41 * 45) = .33 m^2 / s
A reconnaissance plane flies 578 km away from
its base at 360 m/s, then flies back to its base
at 540 m/s.
What is its average speed?
Answer in units of m/s.
Considering the definition of speed, the average speed is 431.94 m/s.
Definition of speedSpeed is a physical quantity that expresses the relationship between the space traveled by an object and the time used for it.
In other words, the speed is associated with the change of position of an object in space within a certain amount of time.
The speed can be calculated using the expression:
speed= distance traveled÷ time
Average speed in this caseIn this case, you know that:
A reconnaissance plane flies 578 km away (equal to 578,000 m, being 1 km= 1000 m) from its base at 360 m/s.The reconnaissance flies back to its base at 540 m/s.Replacing in the definition of speed you can calculate the time it takes to fly away and back:
Flies away: 360 m/s= 578,000 m÷ timeFlies back: 540m/s= 578,000 m÷ timeSolving:
Flies away: 360 m/s× time= 578,000 m → time= 578,000 m÷ 360 m/s → time= 1,605.55 secondsFlies back: 540m/s= 578,000 m÷ time → time= 578,000 m÷ 540 m/s → time= 1,070.77 secondsThen, the total distance traveled and the total time will be the sum of each of the sections traveled:
Total distance traveled= distance to fly away + distance to fly back= 578,000 m + 578,000 m= 1,156,000 mTotal time= time to fly away + time to fly back= 1,605.55 seconds + 1,070.77 seconds= 2,676.32 secondsReplacing in the definition of speed:
speed= 1,156,000 m÷ 2,676.32 s
Solving:
speed= 431.94 m/s
Finally, the average speed is 431.94 m/s.
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d = 250 g/cm³ V = ? m = 1000 g
The volume is 4cm³.
The mass of a substance per unit of volume is its density. Density is most frequently represented by the symbol ρ.The density is 250g/cm³.Mass is a physical body's total amount of matter. Inertia, or the body's resistance to acceleration when a net force is applied, is also measured by this term. The strength of an object's gravitational pull on other bodies is also influenced by its mass. The kilogramme serves as the SI's fundamental mass unit.The mass is 1000g.density = mass/volumeVolume is a measurement of three-dimensional space that is occupied. It is frequently expressed mathematically using imperial or SI-derived units.volume = mass/densityvolume = 1000/250volume = 4cm³To learn more about density, visit :
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5.
In 1934, the wind speed on Mt. Washington in New Hampshire reached a record high.
Suppose a very sturdy glider is launched in this wind, so that in 45s the glider reaches the
speed of the wind. If the glider undergoes constant acceleration of 2.29m/s², what is the
wind's speed? Assume the glider is initially at rest.
The Speed of wind will be 103.5 m/s.
It is stated in the question that a glider is launched into the wind and in 45 seconds it attains the speed of the wind. Also, It is given that it attains a constant acceleration of 2.29m/s² and it starts moving from a state of rest.
We know the relation between velocity, time, and acceleration can be represented by Newton's first equation: v = u + at
where, v = Final velocity, u = Initial velocity, a = Acceleration, and t = Time
In this case, we have to find the final velocity of the glider to know the speed of the wind, and u = 0, a = 2.29m/s², t = 45sec
Putting values in the equation we get :
=> v = 0 + (2.29)*45
=> v = 103.5
Hence, the Speed of wind will be 103.5 m/s
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Average velocity is different than average
speed because calculating average velocity involves
The correct answer is displacement.
Average velocity differs from average speed because displacement is used to calculate average velocity.
What is displacement?
Being a vector, displacement has both magnitude and direction. In one-dimensional motion, the direction should be stated with a plus or minus sign to ensure sure the direction is right. It always occurs in a straight line between two sites. Although it is not a vector variable and lacks a direction sign, the word "distance traveled" is also used to refer to the length of the path that was taken to get from one place to another. The distance traveled is not always equal in both magnitude and direction; on occasion, it may exceed the magnitude of the displacement between the sites.
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You are asked to do an experiment to measure g. You set up a device that drops a metal ball from rest from a height of 1.650 meters. Using an accurate timing device that detects the release of the ball and it’s landing in the floor, you measure the average time of the falling ball to be 0.585 seconds. What do you measure the value of g as?
The value of g of the metal ball that falls from a height of 1.65 m at an average of 0.585 seconds is 4.82 m / s²
a = v / t
v = d / t
a = Acceleration
v = Velocity
d = Distance
t = Time
d = 1.65 m
t = 0.585 s
v = 1.65 / 0.585
v = 2.82 m / s
g = a = 2.82 / 0.585
g = 4.82 m / s²
Here the acceleration is called as g because the ball is falling vertically. That is why it is called as g ( Acceleration due to gravity )
Therefore, the value of g of the metal ball that falls from a height of 1.65 m at an average of 0.585 seconds is 4.82 m / s²
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What is the speed of the electron when it is 10.0 cm from the +3.00 nC charge?
The speed of the electron when it is 10.0 cm from the +3.00 nC charge is 30×[tex]10^{-2}[/tex] meters per second.
Given :
q=3.00 nC
r=distance=10 c.m
we apply formula
Velocity of electron =qd
=10×[tex]10^{-2}[/tex]×3=30×[tex]10^{-2}[/tex] m/sec
The speed of electricity is determined by what you mean by the term "electricity." This is a broad term that essentially means "all things relating to electric charge." I'll presume we're talking about an electrical charge current moving through a metal wire, like the power cord of a light. Electrical currents passing through metal wires have three different velocities, all of which are physically significant:
The velocity of electron drift.
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2. What does the term Brownian motion mean?
Answer:
The term Brownian motion is the random movement of particles in a liquid repeatedly collapsing with other molecules.
Explanation:
Hope It Helps
Sorry If I'm Wrong
< Question 11 of 27 >
A car traveling 88.0 km/h on a straight road is 2500 m behind a truck traveling at 64.0 km/h.
How much time t will it take the car to catch up with the truck?
t =
A truck moving at 64.0 km/h is 2500 m behind an automobile traveling at 88.0 km/h on a straight route.
How long will it take the automobile to overtake the truck?
Distance is the sum of an object's movements, regardless of direction. Distance can be defined as the amount of space an object has covered, regardless of its starting or ending position.
41 kilometers
After a half-hour, the first car is 32.5 kilometers to the north. After a half-hour, the second automobile is 25 kilometers east. You can find out their angular separation from one another using the Pythagorean theorem:
d = √(32.5² +25²) = √1681.25 ≈ 41.00
After a half-hour, the automobiles are around 41 kilometers apart.
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