4. Un móvil viaja en línea recta con una velocidad media de 1200 cm/s durante 9 s, y luego con velocidad media de 480 cm/s durante 7 s, siendo ambas velocidades del mismo sentido: a) ¿cuál es el desplazamiento total en el viaje de 16 s? B) ¿cuál es la velocidad media del viaje completo?
Answer:
A) El desplazamiento total del viaje es 14160 centímetros.
B) La velocidad media del viaje completo es 885 centímetros por segundo.
Explanation:
A) El desplazamiento es el producto de la velocidad media por el tiempo. El desplazamiento total es la suma de desplazamientos asociados a cada velocidad media, entonces:
[tex]x = \left(1200\,\frac{cm}{s}\right)\cdot (9\,s)+ \left(480\,\frac{cm}{s} \right)\cdot (7\,s)[/tex]
[tex]x = 14160\,cm[/tex]
El desplazamiento total del viaje es 14160 centímetros.
B) La velocidad media del viaje es el desplazamiento total dividido por el tiempo total, es decir:
[tex]\bar v = \frac{14160\,cm }{16\,s}[/tex]
[tex]\bar v = 885\,\frac{cm}{s}[/tex]
La velocidad media del viaje completo es 885 centímetros por segundo.
The horizontal distance between two nodes is 1.5 meters what is the wavelength of then standing wave
Answer:
[tex]\lambda=3\ m[/tex]
Explanation:
Given that,
The horizontal distance between the two nodes is 1.5 meters.
We need to find the wavelength of the standing wave.
If we know the distance between nodes and antinodes, then the equation is :
[tex]\dfrac{\lambda}{2}=D[/tex]
Where
[tex]\lambda[/tex] is the wavelength
So,
[tex]\lambda=2D\\\\=2\times 1.5\\\\=3\ m[/tex]
So, the wavelength of the standing wave is equal to 3 m.
A vertical piston-cylinder device initially contains 0.1 m^3 of air at 400 K and 100 kPa. At this initial condition, the piston is resting on a stop. The piston-cylinder device is connected to a supply line with air at 400 K and a pressure of 500 kPa. The valve between the supply line and the piston-cylinder device is opened and is left open until the pressure in the piston-cylinder device reaches 500 kPa. The piston is observed to start moving when the pressure in the cylinder is 200 kPa and the piston continues to rise until it reaches a second stop. At the second stop, the piston-cylinder volume is 0.2 m^3 . The final temperature and pressure in the piston-cylinder device are 440 K and 500 kPa, respectively. Determine the heat transfer to or from the piston-cylinder device for the filling process Determine heat transfer (kJ) during the entire process.
Answer:
[tex]Q=-38.15kJ[/tex]
Explanation:
From the question we are told that
Piston-cylinder initial Volume of air [tex]v_1=0.1 m^3[/tex]
Piston-cylinder initial temperature [tex]T_1=400k[/tex]
Piston-cylinder initial pressure [tex]P_1= 100kpa[/tex]
Supply line temperature[tex]T_s=400k[/tex]
Supply line pressure [tex]P_s= 500kpa[/tex]
Valve final pressure [tex]P_v=500kpa[/tex]
Piston movement pressure [tex]P_m=200kpa[/tex]
Piston-cylinder final Volume of air[tex]v_2=0.2 m^3[/tex]
Piston-cylinder final temperature [tex]T_2=440k[/tex]
Piston-cylinder final pressure [tex]P_2= 500kpa[/tex]
Generally the equation for conservation of mass is mathematically given by
[tex]Q=m_2 \mu_2-m_1 \mu_1 +W-(m_2-m_1)h[/tex]
where
Initial moment
[tex]m_1=\frac{p_1 V_1}{RT_1}[/tex]
[tex]m_1=\frac{100*0.1}{0.287*400}[/tex]
[tex]m_1=8.7*10^-^2kg[/tex]
Final moment
[tex]m_2=\frac{p_2 V_2}{RT_2}[/tex]
[tex]m_1=\frac{500*0.3}{0.287*440}[/tex]
[tex]m_1=79*10^{-2}kg[/tex]
Work done by Piston movement pressure
[tex]W=Pd[/tex]
[tex]W=P(v_2-v_1)[/tex]
[tex]W=200(0.2-0.1))[/tex]
[tex]W=20000J[/tex]
Heat function
[tex]h=cT_1[/tex]
[tex]h=1.005(400)[/tex]
[tex]h=402[/tex]
Therefore
[tex]Q=(0.792*0.718(440)-0.0871*0.718(400)+20-(0.792-0.087)*402))[/tex]
[tex]Q=-38.15kJ[/tex]
It is given mathematically that the system lost or dissipated Heat of
[tex]Q=-38.15kJ[/tex]
which vector is the sum of vectors a and b
Answer:
C
Explanation:
Vector A points up
Vector B points right
The combination must be both up and right which is C
has anyone done this???i need the last questions for 1 and 2
Answer:
no i haven't done it
Explanation:
clean yo computer tho
I can someone help me and also I gtg so ill be back in a bit
Answer: No sure what to do
Explanation: points for points
A car starts from rest with an acceleration of 5.0 m / s² and travels a distance of 1.0 km. What is the speed value of this car?
Answer:
100 m/s
Explanation:
We'll begin by converting 1 km to m. This can be obtained as follow:
1 km = 1000 m
Finally, we shall determine the final velocity of the car. This can be obtained as follow:
Initial velocity (u) = 0 m/s
Acceleration (a) = 5.0 m/s²
Distance (s) = 1000 m
Final velocity (v) =?
v² = u² + 2as
v² = 0² + (2 × 5 × 1000)
v² = 0 + 10000
v² = 10000
Take the square root of both side
v = √10000
v = 100 m/s
Therefore, the speed value of the car is 100 m/s.
In a clear cup there are three substances. Their densities are 3, 1, and 2. From top of the cup to the bottom, what would the order of substances be sitting inside the cup?
Answer:
1, 2 and 3
Explanation:
The most dense substance will settle at the bottom of the cup
In the system shown above, the pulley is a uniform disk with a mass of .75 kg and a radius of 6.5 cm. The coefficient of friction between the 5.8 kg mass and the horizontal surface is .25, and the ropes does not slip on the pulley. They system is released from rest. Use work-energy principles to determine the kinetic energy of the (a) 2.8 kg mass and (b) the pulley after the 5.8 kg mass has moved 2.2 meters.
Answer:
i am answering the same question 3rd time
please find the answer in the images attached.
Which of the following is the best example of a heat conductor?
Answer:
Anything with a dark shade in color and with no reflective surface or any metalExplanation:
In this case, a dark shirt or blanket would be a heat conductor as well as metal would be, too
The speed of light is 300,000,000 m/s. Red light has a wavelength of 0.0000007 m. What is its frequency?
Answer:
2.33..
Explanation:
f = wavelength/speed
= 0.0000007/300000000
= 2.333...
the distance between a boy and a hill is 250 meters. if the boy shouts after how long will the echo be heard numerical problem
Answer:
1.47 s
Explanation:
From the question,
s = 2d/t................... Equation 1
s = speed of sound in air, d = distance between the boy and the hill, t = time to hear the echo.
make t the subject of the equation
t = 2d/s............... Equation 2
Given: d = 250 meters
Constant: s = 340 m/s
Substitute these values into equation 2
t = (2×250)/340
t = 500/340
t = 1.47 s
A car is traveling constant spoed ol 12 12 m/s When the driver accelerates, the car reaches a speed of 26 m/s in s What is the average acceleration of the
Answer:
Average acceleration of the car is 1.167 m/s^2
Explanation:
The speed of car with which it is travelling is 12 m/s
As the driver accelerates the car, the speed reaches 26 m/s
The change in speed in 12 seconds is
26 -12 = 14 m/s
Average acceleration is change in speed divided by time
[tex]\frac{14}{12} \\1.167[/tex] m/s^2
please answer this time question in do not send a link to an unknown website or you are getting reported.
(1) Use Newton's second law: The force F required to accelerate a mass m with acceleration a satisfies
F = m a
So the force needed to accelerate the lion-stretcher system is
F = (175 kg) (2 m/s²) = 350 N
(2) Average speed is defined as the ratio of distance traveled to the time it takes to travel that distance, so in this case the bus's average speed is
(280 km) / (4 h) = 70 km/h
(3) The vertical lines in the plot split up the distance function into 5-minute chunks. The one with the highest average speed is the one over which the distance changes the most. Roughly, the average speeds over each of the given choices is
• 0 to 5 min : (1500 m - 0 m) / (5 min) = 300 m/min
• 10 to 15 min : (3250 m - 2500 m) / (5 min) = 150 m/min
• 15 to 20 min : (3750 m - 3250 m) / (5 min) = 100 m/min
• 25 to 30 min : (4500 m - 4250 m) / (5 min) = 50 m/min
(4) Velocity is a vector, so it has both magnitude and direction. A car moving at constant velocity would be traveling at the same magnitude and direction. But a car on the circular track is constantly turning and changing direction.
Which of the following forces can change the motion of an object? A. push B. shove C. pull D. all of these
Answer: The answer is D all of these sorry if i am wrong
Explanation:
A paved blacktop parking lot was built on what was
once a soil-covered field. This area will now
experience increased runoff when rain occurs because
the paved parking lot has
A) less capillarity B) less permeability
C) greater infiltration D) greater porosity
Answer:
The answer is B. less permeability.
Explanation:
Which statement explains how planets move in orbit as supported by Newton’s first law of motion?
Planets can change the direction of their own orbital path.
Planets can change orbits due to their inertia.
Planets in motion will have a constant speed unless acted on by an outside force.
Planets with a greater mass will orbit more quickly than smaller planets.
the answer is c i think
Answer:
C. Planets in motion will have a constant speed unless acted on by an outside force.
Explanation:
Took the test
30 kg sits on a table the acceleration due to gravity is 10 m/s^2 what force does the table exert on the television.
0.3N
3N
300N
600N
Answer:
300N
Explanation:
F=m×a
F=30kg×10m/s^2
F=300N
If 30 kilograms sit on a table the acceleration due to gravity is 10 meters/second², then the force exerted by the table on the television would be 300 Newtons,
Therefore the correct answer is option C.
What is acceleration?The rate of change of the velocity with respect to time is known as the acceleration of the object.
As given in the problem If 30 kilograms sit on a table the acceleration due to gravity is 10 meters/second²,
the force exerted = mass × acceleration due to gravity
= 30 kilograms × 10 meters/second²
= 300 Newtons
Thus, the force exerted by the table on the television would be 300 Newtons,
To learn more about acceleration from here, refer to the link;
brainly.com/question/2303856
#SPJ2
Which feature causes a gap in the geologic record?
extrusion
fault
intrusion
erosion
Answer:
A
Explanation:
Answer : a. Extrusion
what celestial body is cloest to earth
Answer:
Mercury
Essentially because Mercury is closest to the Sun, when taking an average over time, Mercury is the closest planet to the Earth, and - in that measure - it is the closest planet to each of the other planets in the Solar System.
Explanation:
This picture clicked by me
How's it
Answer:
Hey dear
U are a Nice photographer
The pic I awesome.
wow that looks really cool! 9/10
1. interpret data- based on the data, describe what alicia did.
2. draw conclusions- what conclusions can you draw? what does stirring do in terms of heat transfer?
help :(
What are tectonic plate boundaries?
A areas where Earth’s core experiences a high amount of stress
B areas where Earth’s core experiences a low amount of stress
C areas where Earth’s crust experiences a high amount of stress
D areas where Earth’s mantle experiences a high amount of stress
Answer:
c
Explanation:
Answer:
Areas where earth crust experiences a high amount of stress
Explanation:
FCAT review question
HELPPPP PLSSS I NEED HELP
Answer:
D. Pearl Harbor
Explanation:
CAN SOMEONE PLEASE HELP FIGURE THIS OUT PLEASE
The mass of a body is 25 kg and the value of acceleration due to gravity is 9.8 m/s^2. Calculate the weight of body.
Explanation:
weight=mass ×acceleration
weight=25×9.8
=245
A hydrogen atom and a carbon atom move at the same speed. Which has the greater kinetic energy?
Answer:
The carbon atom has greater kinetic energy than a hydrogen atom.
Hope this helps! :)
Carbon atom has the greater kinetic energy.
What is meant by kinetic energy ?Kinetic energy is defined as the energy attained by a body by virtue of its motion.
Here,
The speed of the hydrogen atom and carbon atom are the same.
Kinetic energy of hydrogen atom, KEн = 1/2 m(н) v(н)²
Kinetic energy of carbon atom, KEс = 1/2 m(с) v(с)²
where m and v are mass and speed respectively.
Taking the ratio,
KEн/KEс = m(н)/m(с)
KEн/KEс = 2/12
KEн/KEс = 1/6
KEс = 6KEн
Therefore the kinetic energy of carbon atom is 6 times the kinetic energy of hydrogen atom.
Hence,
Carbon atom has the greater kinetic energy.
To learn more about kinetic energy, click:
https://brainly.com/question/72216
#SPJ2
What is the main function of b-cells?
B. They attack cells of the body that are infected.
None of these
A. They create antibodies.
They signal other lymphocytes to go after the pathogens.
Answer: They create antibodies.
What keeps planets in orbit? (i need help asap please T-T 10 points im low on points sorry)
A. Centrifugal force.
B. light energy
C. Gravity
D. All of the Above
Answer:
the answer is C gravity
Explanation:
Increased global temperature may lead to more forest fires, longer droughts, and loss of habitat. How will this effect many species? *
Answer:
Many species will be affected by increased global temperatures due to following reasons as mentioned.
As snow at poles will continue to melt and habitat for many species will be lost. This is create imbalance in the food chain of oceans which are prime source of food for many species. Some species will thrive as their hunters will be eradicated due to loss of habitat and overall food chain balance will be disturbed. This will cause species to go extinct.
The cycle of rain will be disturbed causing an imbalance in water cycle which will cause droughts and species will suffer and die eventually will go extinct.