The speed of the river is 0.5 Km/hr
How do find the speed of the river?Let X be the speed of the boat.
Let Y be the speed of the river.
Downstream speed
X - Y = 4
Upstream speed
X + Y = 5
By solving, we get
2X = 9
X = 4.5 Km/hr
Y = 0.5Km/hr
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a change in position relative to a starting point
How much force is needed to stop a 100-kg football player if she negatively accelerates (decelerates) at 20 m/s2? responses 5 n 5 n 20 n 20 n 200 n 200 n 2000 n 2000 n
The amount of force required to stop a 100-kg football player if she negatively accelerates (decelerates) at 20 m/s² is 2000N.
How to calculate force?Force is a physical quantity that denotes ability to push, pull, twist or accelerate a body and which has a direction.
The force required to accelerate a body can be calculated by multiplying the mass of the body by the acceleration as follows:
Force = mass × acceleration
According to this question, a 100-kg football player negatively accelerates (decelerates) at 20 m/s², the force needed can be calculated as follows:
F = 100kg × 20m/s²
F = 2000N
Therefore, the amount of force required to stop a 100-kg football player if she negatively accelerates (decelerates) at 20 m/s² is 2000N.
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URGENT!! ILL GIVE BRAINLIEST! AND 100 POINTS
The pictures show four wavelengths of sound. Which line shows the lowest frequency?
A. W
B. X
C. Y
D. Z
Answer: x
Explanation:
the closer the waves are to each other the higher the frequency
Answer: X
Explanation: i took the test
Compare the energy of a 1-megaton hydrogen bomb to the energy released by a major earthquake.
Compare the energy of a 1-megaton hydrogen bomb to the energy released by a major earthquake. Earthquake/Ebomb = 5.
How many megatons is a hydrogen bomb?Although hydrogen bombs with an explosive force of more than 50 megatons have exploded, the weapons mounted on strategic missiles typically have a range of 100 kilotons to 1.5 megatons.The "Tsar Bomba," commonly known, was around 3,300 times more powerful than the 15-kiloton nuclear weapon dropped on Hiroshima and produced an explosion of 50 megatons.The area that is destroyed varies as the square of the distance, but the volume that the weapon's energy spreads into varies as the cube of the distance. Therefore, 80 square miles would be destroyed by a single bomb having a yield of 1 megaton. In contrast, eight bombs with a combined yield of 125 kilotons would decimate 160 square miles.
Compare the energy of a 1-megaton hydrogen bomb to the energy released by a major earthquake. Earthquake/Ebomb = 5.
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How many valence electrons does the ground-state electron configuration of nitrogen have?.
Answer:5 valence electrons
Explanation:
19. Name one physical property and one chemical
property of wood.
HELPPP
Answer:
malleability&flammable.
Explanation:
URGENT!! ILL GIVE BRAINLIEST! AND 100 POINTS
If Janie puts her hand on a
cold metal doorknob, how will
thermal energy move??
Answer:
B. Heat moves from her hand to the door knob
Explanation:
This is because heat flows from hot to cold objects.
Answer:
B. Heat moves from her hand to the doorknob.
Explanation:
A simple pendulum, consisting of a mass m and a string of length l, swings upward, making an angle θ with the vertical. The work done by the tension force is?.
The work done by tension force in pendulum is zero.
We need to know about pendulum experiment to solve this problem. The pendulum is a simple experiment to calculate gravitational acceleration.
The work done is proportional to force and displacement. It can be determined as
W = F . s
where W is work done, F is force and s is displacement.
From the question above, the given parameters are
mass is m
string of length is l
angle is θ
F = T
s = 0
In pendulum motion, there is no displacement so the work done by the tension force is zero.
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gasoline vapor is injected into the cylinder of an automobile engine when the piston is in its expanded position. the temperature, pressure, and volume of the gas-air mixture are t1
Answer:
bad for the environment
Explanation:
what is causing air pollution and killing animals and killing trees which is bad for the environment
what is displacement vs speed
Answer:
Displacement is the vector difference between the ending and starting positions of an object. It may be very different from the distance the object has travelled along the way. Velocity is the rate at which displacement changes with time.
Explanation:
A soccer ball rolls to a stop from a speed of 25 m/s with an acceleration of * 5 points
-5 m/s/s. How far does it roll until it stops?
O 62.5 m
8.33 m
2.5 m
104.2 m
937.5 m
The distance the soccer ball cover, until it stops, is 62.5m
The distance the ball rolls up to before coming to rest may be calculated using Newton's third equation of motion:
v² = u² + 2as .......(i)
Where v ⇒ Final velocity
u ⇒ Initial velocity
a ⇒ Acceleration
s ⇒ Displacement
Now as per the question,
v = 0 m/s
u = 25 m/s
a = -5m/s²
Putting these values in equation (i)
0 = (25)² - 2× 5 × s
0 = 625 - 10s
10s = 625
s = 625/10
s = 62.5m
Therefore, the distance the ball cover, until it stops, is 62.5m.
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A car traveling in a straight line with an initial velocity of 10 m/s accelerates at a rate of 4. 1 m/s2to a velocity of 28 m/s. What is the distance covered by the car in this process? State your answer to two decimal places
Answer: 83.41m
Explanation:
v^2=vo^2+2a(x-xo)
x=?
xo=0
a=4.1m/s^2
v=28m/s
vo=10m/s
784=100+2(4.1)(x-0)
684=8.2x
x=83.4146341463
x=83.41m
you're welcome
the van of hans and frans is stuck on slippery ice, so they must get out and move it by hand. hans pushes rightwards with force magnitude f hf h f, start subscript, h, end subscript and frans pulls rightwards. the van of mass mmm accelerates with magnitude aaa rightwards.
The expression for horizontal magnitude acceleration of van is a = ( [tex]F_{H}[/tex] + [tex]F_{F}[/tex] ) / m
Given that,
The magnitude of the force applied by Hans on van = [tex]F_{H}[/tex]
The magnitude of the force applied by Frans on van = [tex]F_{F}[/tex]
Let us consider the horizontal magnitude of acceleration as a and the mass of van as m.
The horizontal forces acting on the van are [tex]F_{H}[/tex] and [tex]F_{F}[/tex].
∑[tex]F_{Hor}[/tex] = [tex]F_{H}[/tex] + [tex]F_{F}[/tex]
m a = [tex]F_{H}[/tex] + [tex]F_{F}[/tex]
a = ( [tex]F_{H}[/tex] + [tex]F_{F}[/tex] ) / m
The vertical forces here are the force due to weight and the normal force due to its weight on ground.
Therefore, the expression for horizontal magnitude acceleration of van is a = ( [tex]F_{H}[/tex] + [tex]F_{F}[/tex] ) / m
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To hammer a horseshoe a blacksmith heats it until it is red hot. the blacksmith the plunges it into cold water. a) what happens to the temperature of the horseshoe and the temperature of the water? b) how have these changes in temperature taken place?
When the horseshoe is heated until it's red hot and when it is plunged into cold water the temperature of the horseshoe decreases and the temperature of the water increases. These changes take place by the Principle of Calorimetry.
The principle of Calorimetry states that whenever a hot body comes in contact with a cold body the hot body loses heat and the cold body gains heat. The amount of heat lost by the hot body is equal to the amount of heat gained by the cold body.
When the horseshoe is heated red hot, its temperature increases, and the temperature of cold water is low. When the horseshoe is plunged into the cold water it loses its heat and its temperature decreases. On the other hand, the cold water gains the heat lost by the horseshoe and its temperature increases.
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In December 2020, SpaceX Falcon 9 was launched into orbit at the Kennedy Space Center in Cape Canaveral. Explain how Newton's three laws are at work when the SpaceX Falcon 9 was launched into orbit? (50 Points; and will mark Brainiest!)
Answer:Put to the test by seeing the force between the rocket and ground as well as the gravitational pull
Explanation:
hope it helps
A swimmer swims at 5 m/s. How long would it take to swim 5 laps of a 50m pool?
how do you prevent mother to child transmission
The prevention factors required to prevent mother-to-child transmission are:
Get antenatal administrations and HIV testing amid pregnancy. Have got to antiretroviral treatment (ART) Practice secure childbirth hones and fitting newborn child feeding. Make utilization of newborn child HIV testing and other post-natal healthcare administrations.Mother-to-child transmission also referred to as Perinatal is described as when HIV is transmitted from the mother to the child during pregnancy, childbirth, or breastfeeding. For ladies who are pregnant, HIV counseling and testing is the primary and most basic step in lessening mother-to-child transmission. Prenatal Treatment , when taken all through pregnancy, conveyance, and breastfeeding, can decrease the chance of HIV transmission to a newborn child to less than 5%. Ladies who test HIV-positive amid their pre-birth visits at EGPAF-supported locales are quickly connected to long-lasting Craftsmanship and counseled on the benefits of enrollment and maintenance on treatment. Safe childbirth is an imperative thought for all hopeful moms and especially for HIV-positive ladies. Post-natal care is eesential for both the mother and the baby especially since it includes child wellness services such as nutrition, immunization, and growth monitoring.
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a jet fighter pilot wishes to accelerate from rest at 5.00 g to reach mach-3 (three times the speed of sound) as quickly as possible. experimental tests reveal that he will black out if this acceleration lasts for more than 5.00 s . use 331 m/s for the speed of sound.
With an acceleration 5 g pilot can reach the greatest speed of 240 m/s before blacking out.
The acceleration due to gravity is g.
g = 9.8 m/s²
The jet's acceleration is,
[tex]Acceleration = Mass × Gravity[/tex]
[tex]a = m \times g[/tex]
[tex]a = 5 \times 9.8[/tex]
[tex]a = 49 \: m/s ^{2}[/tex]
The jet's acceleration is 49 m/s².
The speed of sound be v.
v = 331 m/s
Let the initial velocity of the jet be
[tex]v _i[/tex]
[tex]v _i = 0[/tex]
The time at which pilot wil black out = 4.9 seconds
Let the time taken by the pilot to reach Mach 3 be t.
The final velocity will be,
[tex]v _f = 3 \times v[/tex]
[tex]v _f = 3 \times 331[/tex]
[tex]v _f = v _i + at[/tex]
[tex]993 = 0 + (49) \times t[/tex]
[tex]t = 20.26 \: seconds[/tex]
So, he time taken to reach Mach 3 is 20.26 seconds. Thus, the pilot will black out.
With an acceleration 5 g pilot can reach the greatest speed of,
[tex]v _f = 0 +( 49 \times 4.9)[/tex]
[tex]v _f = 240.1 \: m/s[/tex]
Therefore, the with an acceleration 5 g pilot can reach the greatest speed of 240 m/s before blacking out.
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The complete question is-
a jet fighter pilot wishes to accelerate from rest at 5.00 g to reach mach-3 (three times the speed of sound) as quickly as possible. experimental tests reveal that he will black out if this acceleration lasts for more than 5.00 s . use 331 m/s for the speed of sound.
A star is moving directly towards earth at a large fraction of the speed of light. How does the light we observe from this star compare to the light received from the same star if it were at rest relative to earth?.
A star is moving directly toward earth at a large fraction of the speed of light. The light we observe from this star compared to the light received from the same star if it were at rest relative to earth will be blueshifted.
The amount of light emitted by a star coming towards earth would have a shorter wavelength as compared to other sources of light. This refers to the doppler shift principle. According to the doppler shift principle, if an observer is moving in relation to a source, then the change in frequency in the light waves would be relative to that observer.
In this case, we will observe that the star approaching earth will shift its spectral lines toward the blue end of the light series.
Since blue light has a shorter wavelength, therefore, the large fraction of the speed of light coming out from a star would correspond to the blue end of the light spectrum hence called blueshift.
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A vector has a magnitude of 20
meters due east and a second vector
has a magnitude of 20 meters due
west. What is the resultant of these
two vectors?
Answer:
V1x = 20 one to write x-component of vector 1
V2x = -20 " 2
Vx = V1x + V2x = 20 + (-20) = 0
A 500 kg pumpkin is dropped 15 m on
top of a school bus.
How much gravitational potential
energy was gained when it was
winched up 15 m?
Assuming all of this GPE is turned
into kinetic energy as the pumpkin
drops, work out its speed as it hits
the school bus.
gravitational potential energy was gained when it was winched up 15 m is 73500 J.
GPE is turned
into kinetic energy as the pumpkin drops
Then,
pumpkin speed is 17.14 m/s.
What is gravitational potential energy?The potential energy that a huge item has in relation to another massive object due to gravity is known as gravitational energy or gravitational potential energy. When two objects descend toward one another, the potential energy associated with the gravitational field is released (transformed into kinetic energy). Bringing two things farther apart increases the gravitational potential energy.m, g, and h stand for mass, the gravitational constant (with a value of around 9.8 m/s), and height, respectively.To learn more about : gravitational potential energy
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The current through a resistor is inversely proportional to its resistance. With a 330 resistor, the
current is 25 mA.
What value of resistance is needed if you wish a 55 mA current to pass?
Answer:
Meine Mama hat mir einfach erlaubt das ich Cola Trinken darf wie cool ist das bitte! Jetzt zock ich Fortnit.e und trink Cola! YIPEEE!
Explanation:Meine Mama hat mir einfach erlaubt das ich Cola Trinken darf wie cool ist das bitte! Jetzt zock ich Fortnit.e und trink Cola! YIPEEE!Meine Mama hat mir einfach erlaubt das ich Cola Trinken darf wie cool ist das bitte! Jetzt zock ich Fortnit.e und trink Cola! YIPEEE!Meine Mama hat mir einfach erlaubt das ich Cola Trinken darf wie cool ist das bitte! Jetzt zock ich Fortnit.e und trink Cola! YIPEEE!Meine Mama hat mir einfach erlaubt das ich Cola Trinken darf wie cool ist das bitte! Jetzt zock ich Fortnit.e und trink Cola! YIPEEE!Meine Mama hat mir einfach erlaubt das ich Cola Trinken darf wie cool ist das bitte! Jetzt zock ich Fortnit.e und trink Cola! YIPEEE!Meine Mama hat mir einfach erlaubt das ich Cola Trinken darf wie cool ist das bitte! Jetzt zock ich Fortnit.e und trink Cola! YIPEEE!Meine Mama hat mir einfach erlaubt das ich Cola Trinken darf wie cool ist das bitte! Jetzt zock ich Fortnit.e und trink Cola! YIPEEE!Meine Mama hat mir einfach erlaubt das ich Cola Trinken darf wie cool ist das bitte! Jetzt zock ich Fortnit.e und trink Cola! YIPEEE!
Find the length of the trajectory of the vector valued function f(t) = (2 , 1, e e-t) from 0 to in 2
The length of the trajectory of the function f(t) = (2t , 1, [tex]e^{2} + e^{-t}[/tex]) is 3/2
Calculationlength = [tex]\int\limits^b_a {\sqrt{(\frac{dx}{dt})^2 + (\frac{dy}{dt})^2 + (\frac{df}{dt})^2 } \, dx[/tex]
=[tex]\int\limits^{ln2}_0 {e^{t}+ e\\^{-t} } \, dt[/tex]
=(2+1) - (1/2+1)
=2-1/2 =3/2
What is a vector?In mathematics and physics, the term “vector” is used informally to describe certain quantities that cannot be described by a single number or by a set of vector space elements.
A vector example is what?A quantity or phenomena with independent qualities for both magnitude and direction is called a vector. The term can also refer to a quantity’s mathematical or geometrical representation.
Velocity, momentum, force, electromagnetic fields, and weight are a few examples of vectors in nature.
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HEY GUYS!! I NEED YOUR HELP URGENTLY ON THIS PHYSICS QUESTION. I WILL GIVE BRAINLIEST.
Answer:
Q=Mcø
528=m×4200×50
m=528÷(4200×50)
m=0.002514kg
2.514g
A straight wire segment carries 0.25a. what length would it need to be to exert a 4.0-mn force on a magnet that produces a uniform magnetic field of 0.015t that is perpendicular to the wire?
A straight wire segment that carries 0.25a, would need 1.10m to produce a uniform magnetic field.
Where is the homogenous magnetic field?A uniform magnetic field is the solution. The magnetic field is considered to be uniform if its strength is the same at all of the area’s equally spaced points. It is represented by a parallel set of equally spaced lines.
What is a magnetic field’s uniform and non-uniform state?A magnetic field that receives the same magnetic forces in all directions is said to have a uniform magnetic field. The magnetic field that experiences unequal forces from various directions is said to have a non-uniform magnetic field.
Give an example of a uniform magnetic field.Helmholtz coils are available for purchase in order to provide a consistent magnetic field. The constant magnetic fields enable calibration in any scenario.
CalculationI = 0.25A
B = 0.015 J
F = 4.0 mN
F = I (dl x B)
4 x 10^(-3) = 0.25 x l x 0.015
⇒ l = (4 x 10^(-3)) / 0.015 x 0.25
≈ 1.1 m
Thus, the length required would be 1.1m
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a human expedition lands on an exoplanet. one of the explorers is able to jump a maximum distance of 18.5 m with an initial speed of 2.30 m/s. find the gravitational acceleration on the surface of the exoplanet. assume the planet has a negligible atmosphere. (enter the magnitude in m/s2.)
The exoplanet where the human expedition landed has a surface gravity acceleration of -0.20 meters per square second.
What is the equation of motion?The relationship between a moving body's distance, velocity, acceleration, and time is known as the equation of motion.
Here, is the beginning body, is the final body, is the acceleration of the body, and is the distance travelled. This is the third equation of motion for distance.
The greatest distance leapt by one of the explorers is 19.5 metres, as stated in the problem.
The starting velocity is 2.80 m/s.
It is necessary to determine the gravitational acceleration on the exoplanet's surface.
The explorers' velocity is currently zero. As a result, according to the third equation of motion, the explorers are moving downhill as shown by the negative sign.
Thus, the gravitational acceleration on the surface of the exoplanet is -0.20 meter per squared second.
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Based off the image below, identify where the kinetic or potential energy is the highest?
That is the answer
So in the position of 1 and 5 height is maximum from the ground and here velocity is also minimum so potential energy is maximum and in the position of no 3 velocity maximum so kinetic energy will be maximum.
Briefing:We know total energy that is kinetic energy + potential energy is always constant so where kinetic energy is maximum there potential energy will be minimum and where potential energy is maximum there kinetic energy will be minimum.
we know potential energy=m g h
where h=height
So in the position of 1and 5 height is maximum from the ground and here velocity is also minimum so potential energy is maximum and in the position of no 3 velocity maximum so kinetic energy will be maximum.
What are some examples of kinetic energy?Kinetic energy, which may be seen in the motion of an object, particle, or group of particles, is the electricity of motion. Any moving item uses kinetic energy, such as a person who walks, a baseball being thrown, a piece of food falling from a table, or a charged particles in an electric field.
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Q1.
Figure 1 shows a car travelling at a constant speed on a straight, level road
Figure 1
6
Figure 2 shows a free body diagram for the car.
Figure 2
Normal contact force
Forward
force
Air resistance
Weight
(a) Explain how the free body diagram shows that the resultant force on the car is zero.
The lengths of the arrows that show the forces that act on the car are equal hence no net force acts on the car.
What is the free body diagram?The free body diagram is the image that shows us the forces that are acting on a body. We know that the greater the magnitude of the forces that act on a body, the longer the line that shows the force that acts on a body, the greater the magnitude of the force.
Now we have the free body image of the car. If we look at the forces that act in the vertical direction which are the weight and the normal reaction we can see that those forces are balanced since the arrows are of equal length. The forces that acts in the horizontal direction, forward force and air resistance also have lines of equal length which show that the forces are balanced.
Since the lengths of the arrows that show the forces that act on the car are equal in length, the forces are balanced and there is no net force that acts on the car.
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Calculate the speed in m/s of a skateboarder who accelerates from rest for 3 seconds down a ramp at an acceleration of 5m/s2
Answer: 15m/s
Explanation:
Determine the thermal voltage for a diode at a temperature of 20 degrees celsius