A subway car whose mass is 52,000. kg is traveling with a velocity of 3.4 m/s due north and collides with a second subway car whose mass is also 52,000. kg and is at rest. If the two cars stick together after the collision, what is the velocity of the two cars?
Answers
Answer:
1.7 m/s
Explanation:
52,000kg x 3.4 m/s= 176,800
52,000+52,000= 104,000
176,800/104,000= 1.7m/s
Related Questions
A testable prediction is a(n) ______. Group of answer choices a. hypothesis b. experiment c. exercise d. variable
Answers
Answer :A testable prediction is also known as a hypothesis.
Explanation: I think
A testable prediction is a hypothesis. (a)
I need help with this asap please!!
Answers
Answer:
9000Ns
Explanation:
Given parameters:
Mass of sled = 100kg
Net force = 150N
Time = 1min = 60s
Unknown:
Total impulse = ?
Solution:
The total impulse on the body can be derived using the expression below;
Impulse = Force x time
So;
Impulse = 150 x 60 = 9000Ns
What is the magnitude of impulse of a 2.7 gram ping pong ball initially moving at 15 m/s, if hit by a ping pong paddle and then moves the opposite direction at 14/ms
Answers
Answer:
impulse = 0.0783 kg.m/s
Explanation:
The impulse is the product of the force and an interval of time. This can be represented in terms of the mass of the body and the change in the velocity of the body in such a time:
\(F\Delta t=m\Delta v\) \(=|m(v_f-v_i)|\)
m: mass of the body = 2.7gm = 0.0027 kg
vf: final velocity = -14m/s
vi: initial velocity = 15m/s
vf is negative because the direction of the ball is opposite to the initial direction:
\(|m(v_f-v_i)|=|(0.0027kg)(-14m/s-15m/s)|=0.0783\frac{kg.m}{s}\)
hence, the impulse of the ping pong ball is 0.0783 kg.m/s
Hurry Plz 50 points and possibly Brainlest.
Your thumb contains the only saddle joint in the entire body. How would your hand function differently if your thumb contained a pivot joint? What if it contained a ball and socket joint? Describe four consequences of having a different type of joint in the thumb.
P.S. Detailed Response plz
Answers
Answer:
The saddle joint allows movement in different directions but only a small amount of rotation. The thumb is the only organ that has a saddle joint.
It should be noted that the bones that are in the saddle joint ensure the back and forth movement of the thumbs.
The pivot joint is the joint that's responsible for ensuring that one bone rotates around another bone. Ball and socket joint can be found in the shoulder and the hip and it allows for greater freedom of movement.
When compared to other movable joints, the saddle joint is prone to dislocation because it's free-moving and rotates on its own axis alone.
In conclusion, if the thumb contained a pivot joint or a ball and socket joint, it'll be able to move more freely.
Help, I cant do it by myself and I really need this done. Please.
Part One
Text Version
Image shows a lake, a factory, a cloud in the sky, a cow, dead organisms, a tree, and the sun. An arrow from the sun to the tree is labeled A. An arrow from the sky to the tree is labeled B. The sky is labeled C above the cloud. The letter D is in the air and an arrow points from it down to dead organisms. An arrow points from dead organisms to the ground labeled E. An arrow points from the cow into to the sky labeled F. An arrow points from the factory to the sky labeled G. An arrow from the sky to the lake is labeled H above the lake.
Using the diagram above, match the description to the corresponding location in the carbon cycle model. Provide the letter only.
Carbon dioxide is converted to sugar used for food.
Location:
Carbon trapped in fossil fuels is converted to carbon dioxide.
Location:
Organic carbon is converted to fossil fuels.
Location:
Carbon dioxide is converted to carbonates.
Location:
Sugar is broken down and converted to carbon dioxide.
Location:
Part Two
Text Version
Images shows a lake labeled carbonates in water, a cow labeled animal respiration, a tree labeled photosynthesis, a factory labeled factory emissions, the sun labeled sunlight, a cloud labeled carbon dioxide in atmosphere, another tree labeled plant respiration, an arrow from organic carbon to dead organism, and fossils and fossil fuels. Arrows are labeled as follows: A from the sunlight to photosynthesis, B from carbon dioxide in atmosphere to photosynthesis, C from factory emissions to carbon dioxide in atmosphere, D from carbon dioxide in atmosphere to carbonates in water, E from dead organisms to fossils and fossil fuels, and F from plant respiration to the sky.
Using the diagram above, answer the following questions:
True or False. The arrow labeled C represents a transfer of chemical energy to mechanical energy. Explain why this is true or false.
True or False. The arrow labeled A represents a transfer of solar energy to chemical energy. Explain why this is true or false.
Which arrow or arrows represent a release of carbon dioxide? What process is occurring at the arrow(s) you selected?
Which arrow or arrows indicate a process that cycles carbon from living or nonliving organisms? Describe the process or processes you selected.
Which arrow or arrows represent reactions that demonstrate a conservation of mass and energy? Explain your answer.
Answers
Answer:
Part One:
Location: A - The arrow from the sun to the tree represents photosynthesis, where carbon dioxide is converted to sugar used for food.
Answer: A
Location: G - The arrow from the factory to the sky represents the release of carbon dioxide from factory emissions, which contributes to the conversion of carbon trapped in fossil fuels to carbon dioxide.
Answer: G
Location: E - The arrow from dead organisms to the ground represents the process where organic carbon is converted to fossil fuels over a long period of time.
Answer: E
Location: D - The arrow from the air to dead organisms represents the conversion of carbon dioxide to carbonates, which can be deposited in the ocean and form rocks over millions of years.
Answer: D
Location: F - The arrow from the cow to the sky represents animal respiration, where sugar is broken down and converted to carbon dioxide.
Answer: F
Part Two:
True or False. The arrow labeled C represents a transfer of chemical energy to mechanical energy. Explain why this is true or false.
False. The arrow labeled C represents the transfer of chemical energy (carbon dioxide) from the factory emissions to the atmosphere. There is no mechanical energy involved in this process.
True or False. The arrow labeled A represents a transfer of solar energy to chemical energy. Explain why this is true or false.
True. The arrow labeled A represents photosynthesis, where solar energy is used to convert carbon dioxide into chemical energy in the form of sugar.
Which arrow or arrows represent a release of carbon dioxide? What process is occurring at the arrow(s) you selected?
Arrows C and F represent a release of carbon dioxide. Arrow C represents the release of carbon dioxide from factory emissions, while arrow F represents animal respiration where sugar is broken down to release carbon dioxide.
Which arrow or arrows indicate a process that cycles carbon from living or nonliving organisms? Describe the process or processes you selected.
Arrows B, D, and E indicate processes that cycle carbon from living or nonliving organisms. Arrow B represents photosynthesis where carbon dioxide is taken up by plants, arrow D represents the conversion of carbon dioxide to carbonates which can be deposited in the ocean and form rocks over millions of years, and arrow E represents the conversion of dead organisms into fossil fuels over a long period of time.
Which arrow or arrows represent reactions that demonstrate a conservation of mass and energy? Explain your answer.
All arrows in the diagram demonstrate the conservation of mass and energy. The carbon cycle is a closed system, meaning that the total mass of carbon in the cycle remains constant over time. Energy is also conserved as it is converted from one form to another throughout the cycle.
What factors affect an objects kinetic energy?
Answers
Answer:
friction
air drag
every thing that opposes the motion affects kinetic energy
Explanation:
kinetic energy is a energy which is increase with increase in motion and potential energy is energy stored while the object is at rest
potential energy ∝ 1/(kinetic energy)
as kinetic energy increases potential energy decreases
What is the magnitude of the gravitational field at the surface of a neutron star whose mass is 1.71 times the mass of the sun and whose radius is 10.2 km?
Answers
Magnitude of the gravitational field at the surface of a neutron star whose mass is 1.71 times the mass of the sun and whose radius is 10.2 km is approximately g = 1.984*10^12 m/s²
g=GM/R²
g=6.67*10^-11*1.71*1.989*10^30/(10.2*10^3)^2
g=1.984 * 10^12 (approximately)
Magnitude in physics is simply described as "distance or quantity." It shows the size or direction that an object moves in either an absolute or relative sense. It is a way of expressing something's size or scope. Magnitude in physics often describes a length or a size. An attribute of a mathematical object that indicates whether it is bigger or smaller than other things of the same kind is its magnitude or size. Formally speaking, an object's magnitude is the visible outcome of the class of objects it belongs to's ordered results.
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If four people push on a block, one from each side and all with the same force, the
block will
OA) move, but you don't know which direction
OB) move up
OC move towards you
D) not move
Answers
This would be the correct answer.
This photo shows the visible light spectrum of the Sun. Why does it have all those dark lines on it?
A) The dark lines are caused by Doppler shifts.
B) The dark lines are not real, but rather are artifacts of the photographic process used to record the spectrum.
C) The dark lines come from sunspots on the Sun, which are dark in color.
D) The dark lines represent wavelengths of light at which atoms near the Sun's surface absorb radiation from the hotter solar interior.
Answers
Answer:
D hope this helps you out
which gmaw electrode wire is most commonly used and works great with co2
Answers
The most commonly used GMAW electrode wire that works great with CO₂ is ER70S-6.
Gas Metal Arc Welding (GMAW), also known as MIG (Metal Inert Gas) welding, uses an electrode wire to create an arc that melts and fuses the base metal. The electrode wire, also referred to as the filler wire, plays a crucial role in the welding process.
ER70S-6 is a widely used electrode wire in GMAW applications and is particularly suitable for welding with CO₂ as the shielding gas. It is a solid wire composed of mild steel with specific chemical compositions to provide excellent welding performance and desirable mechanical properties.
The "ER" in the designation stands for Electrode or Rod, "70" represents the tensile strength in ksi (kilo-pounds per square inch), and "S-6" indicates its suitability for general-purpose welding.
ER70S-6 wire offers good arc stability, smooth bead appearance, and low spatter levels, making it highly versatile and suitable for various welding projects. When used with CO₂ as the shielding gas, it provides good penetration, strong welds, and high deposition rates. CO₂ is a commonly used shielding gas in GMAW due to its availability and affordability.
It's important to note that the choice of electrode wire may vary depending on the specific welding application, base metal, and desired welding characteristics. Consulting welding guidelines and considering factors such as material type, joint design, and welding parameters will help determine the most appropriate electrode wire for a particular welding task.
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.
Determine the plane of the force acting on a body of mass 2 kg, the action of which changes the velocity of the body to the equation: v = 3-2t
Answers
The force acting on the body can be determined using Newton's second law of motion,is -4N which states that Force (F) equals mass (m) multiplied by acceleration (a). First, we need to find the acceleration by differentiating the velocity equation with respect to time.
1. The given velocity equation is v = 3 - 2t.
2. To find the acceleration, differentiate the velocity equation with respect to time: a = dv/dt.
3. The derivative of 3 - 2t with respect to t is -2 (since the derivative of 3 is 0 and the derivative of -2t is -2).
4. Now, we have the acceleration: a = -2 m/s².
5. Using Newton's second law, F = m × a, where m = 2 kg and a = -2 m/s².
The force acting on the body is F = 2 kg × (-2 m/s²) = -4 N. Since the force has a negative sign, it acts in the opposite direction to the initial velocity.
The plane of the force is along the straight line where the body's motion occurs, with the force acting opposite to the velocity's direction.
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Find the center of mass of a 50-cm long rod, made of 25 cm of iron (density 9 g/cm3) and 25 cm of aluminum (density 3.2 g/cm3). Express the location of the center of mass as measured from the left of the rod, assuming that the iron part of the rod is on the left and the aluminum part is on the right.
Answers
Answer:
The center of mass is at -1.58 cm, that is towards the left of the origin, or towards the copper end.
Explanation:
Given information: Let the length of the rod is 2l = 100cm
+ 9. What force (in units of Newtons) is needed to give a 3.5 m/s" acceleration to a 1200 kg car?
Answers
Answer:
4200 Newtons
Explanation:
Force = mass x acceleration
1200 x 3.5 = 4200
A 2-kg mass weighs 20 N and is held 4 m above the ground. Its potential energy relative to the ground isa) 80 J.b) 8 J.c) 60 J.d) 20 J.e) none of the above
Answers
The potential energy of the 2-kg mass relative to the ground is approximately 80 J.
A sort of energy known as potential energy is one that an object holds as a result of its location or circumstance. It is the energy that is conserved inside a system and has the capacity to be transformed into different types of energy, such as thermal or kinetic energy. Affected by variables like height, distance, and forces operating on it, an object's potential energy relies on where it is in relation to other objects or reference points.
The correct answer is a) 80 J.
The potential energy of an object is given by the formula PE = mgh, where m is the mass of the object, g is the acceleration due to gravity (9.8 \(m/s^2\)), and h is the height of the object above a reference level (in this case, the ground).
Using the given values, we have:
PE = (2 kg)(\(9.8 m/s^2\))(4 m)
PE = 78.4 J
Therefore, the potential energy of the 2-kg mass relative to the ground is approximately 80 J.
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how are wavelengths measured?
Answers
The wavelength of a wave can be measured in the units of length (L) such as meters (m), centimeters (cm), and kilometers (km), etc.
What is Wavelength?Wavelength is a property of wave which can be measured as the distance between any two adjacent crests of a transverse wave or any two adjacent compressions of a longitudinal wave.
Wave is usually measured in the units of distance which include meters (m), centimeters (cm), and kilometers (km). Wavelength is related to the energy of a wave. Short-wavelength waves usually have more energy than that of long-wavelength waves of the same amplitude.
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4. A racing car has a uniform acceleration of 4 m s - '2. What distance will it cover in 10 s after start?
Answers
Answer:
200 m
Explanation:
Initial velocity- 0
final velocity= v
time= 10 seconds
to find final velocity
v= u + at
v= 0 + 4*10
v= 0 + 40
v= 40 m/s
to find distance
s= ut + 1/2at²
s= 0*10 + 1/2*4*(10)²
s= 1/2 *4*100
s=200m
answer : 200 m
Electrons move from negative to positive while the voltage flows ________ to _______ .
Answers
Answer:
positive to negative.
A dog runs to the left for 20 meters and five seconds. then the dog runs to the right 35 meters in 10 seconds , stands still for 30 seconds and finally runs 15 meters right in 10 seconds. write a title for the graph and correctly label and scale
Answers
The accurate title for the graph is; "A graph of distance against time" and the scale on the x axis is 2cm:1 unit while the scale on the y axis is 2cm: 5 units.
What is a scale?The term scale has to do with the way that we can be able to represent information on paper. It is common that the information that we are trying to depict is too large that we can not easily show the information on paper. This is why we need a graph so that it can be compressed and still be readable by all.
In this case, we are being asked to get a good title for the graph and also to suggest a scale that would be very good for us to be able to present the information and make it intelligible. We must consider the magnitude pf the data so as to do this.
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Where in the galaxy are the most stars born?
Answers
Answer: Stars are formed in dust clouds and are found in most galaxies.
Explanation:
Answer: Stars form inside relatively dense concentrations of interstellar gas and dust known as molecular clouds.
Explanation:
Which would be represented by FN on a force diagram?O Northern ForceO Newton ForceO Normal ForceO Negative Force
Answers
ANSWER
Normal force
EXPLANATION
We want to determine what FN would represent on a force diagram.
On a force diagram, FN represents the component of a contact force that acts perpendicular to the surface with which an object makes contact. It is exerted by surfaces and prevents objects from passing through each other.
This force is known as the normal force.
That is the answer.
a turbine placed 100 m under the water surface of a water reservoir discharges water as a free jet to the surroundings at 6 m/s. if the turbine outlet diameter is 1 m, what is the maximum power output of the turbine?
Answers
The maximum power output of the turbine is 4.95 MW.
To calculate the maximum power output of the turbine, we first need to determine the mass flow rate of the water through the turbine.
Assuming steady-state conditions, the mass flow rate can be calculated using the following equation:
m_dot = rho * A * V
where:
m_dot = mass flow rate (kg/s)
rho = density of water (assumed to be 1000 kg/m^3)
A = area of turbine outlet (pi*(d/2)^2, where d is the diameter of the outlet)
V = velocity of water leaving the turbine (6 m/s)
Substituting the given values, we get:
m_dot = 1000 * pi * (1/2)^2 * 6
m_dot = 5654 kg/s
Next, we can calculate the power output of the turbine using the following equation:
P = m_dot * g * H * eta
where:
P = power output (W)
g = acceleration due to gravity (9.81 m/s^2)
H = height of the turbine above the water surface (100 m)
eta = efficiency of the turbine (assumed to be 0.9)
Substituting the given values, we get:
P = 5654 * 9.81 * 100 * 0.9
P = 4,945,563 W
P = 4.95 MW
Therefore, the maximum power output of the turbine is 4.95 MW.
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Imagine that someone is injured, and their somatic nervous system is impacted. Would this be a life-threatening injury?
A.
Yes, that covers essential internal injuries.
B.
No, that is a minor part of how the body functions.
C.
Probably not since that system deals mostly with mobility.
D.
It is highly likely because that controls the brain and the spine.
Answers
Answer:
C. Probably not since that system deals mostly with mobility.
Explanation:
A spring has 2.000 x 10^3 N/m spring constant.
What mass will make it oscillate 5.0 times per second? 10.0 times per second?
Answers
The frequency (f) of an oscillating spring is related to the mass (m) of the object attached to the spring and the spring constant (k) by the following equation:
f = (1/2π) * sqrt(k/m)
where π is pi (approximately equal to 3.14159).
To find the mass required for a spring with a spring constant of 2.000 x 10^3 N/m to oscillate 5.0 times per second, we can rearrange this equation to solve for m:
m = k / (4π^2 * f^2)
Substituting in the given values, we get:
m = (2.000 x 10^3 N/m) / (4π^2 * (5.0/s)^2) = 0.0255 kg
Therefore, the mass required for the spring to oscillate 5.0 times per second is 0.0255 kg (or approximately 25.5 grams).
Similarly, to find the mass required for the spring to oscillate 10.0 times per second, we can use the same equation:
m = (2.000 x 10^3 N/m) / (4π^2 * (10.0/s)^2) = 0.00638 kg
Therefore, the mass required for the spring to oscillate 10.0 times per second is 0.00638 kg (or approximately 6.38 grams).
How long was a 50 W lightbulb left on for if 500,002 J were burned?
Answers
" 50 W " means " 50 Watts " or " 50 Joules per second ".
(500,002 J) / (50 J/sec) = 10,000.04 seconds
(That's 2 hours 46 minutes 40.04 seconds.)
Some giant ocean waves have a wavelength of 25 m and a frequency of
0.26 Hz. What is the wavespeed of such a wave? *
Answers
Answer:
Explanation:
The frequency equation for waves is
\(f=\frac{v}{\lambda}\) where f is the frequency, v is the velocity, and lambda is the wavelength. Filling in:
\(.26=\frac{v}{25}\) so
v = .26(25) and
v = 6.5 meters/second
What is 8 degrees Celsius in Fahrenheit?
Answers
8 degrees Celsius is equal to 46.4 degrees Fahrenheit when converting temperatures from degrees Celsius to Fahrenheit.
Is a refrigerator safe at 8 degrees Celsius?Between 32 degrees Centigrade and 41 degrees Fahrenheit, or 0 degrees Celcius with 5 degrees Celcius, should be the temperature of the refrigerator's coldest portion. To determine whether food has been kept warmed (above 63 degrees Celsius) or cold (below 8 degrees Celsius), you might use a probe thermometer.
How cold can a person tolerate?The most susceptible body parts to frostbite are the fingertips, nose, ears, toes, cheeks, and chin, so use as much protection as you can. How cold is too cold? When the windchill drops below 0 degrees Celsius or the temperature drops below zero, experts generally advise staying inside.
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A force of 150 N is exerted 22◦north of east. Therefore, the northward component is 139 N north.
Answers
Given :
A force of 150 N is exerted 22◦ north of east.
To Find :
The northward component of force .
Solution :
The angle between the force and east direction is 22° .
So , component of Force F in north direction is given by :
\(Fsin\ \theta\\\\150\times sin\ 22^o\\\\56.19\ N\)
Therefore , the component of force in northward direction is 56.19 N .
Hence , this is the required solution .
which is one characteristic of an electron?
Answers
Answer:
The electron is a negatively charged particle found in the atoms of all the elements. The electrons are located outside the nucleus in an atom. An electron is usually represented by the symbol (e –). The mass of an electron is about the mass of a hydrogen atom.
Explanation:
Magnification is ______ if the body part is moved ________ the image receptor.
a. decreased, closer to
b. decreased, farther from
c. increased, at an angle to
d. increased, closer to
Answers
Magnification is increased if the body part is moved closer to the image receptor. When the body part is placed closer to the image receptor, the object's magnification increases.
This increase in magnification happens since the image receptor's distance is reduced from the object, causing a smaller field of view for the given image receptor area.Since the image receptor is reduced, magnification occurs and an image is enlarged. The body part's distance from the image receptor may be altered by modifying the tube head's angulation. If the angulation of the tube head is increased, the body part is placed closer to the image receptor, causing an increase in magnification.
Magnification also varies depending on the size of the object. Magnification can be reduced by increasing the distance between the object and the image receptor. Similarly, decreasing the object's size or increasing the image receptor size may help reduce magnification in the imaging process. Hence, option D (increased, closer to) is the correct answer.
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What is the density of a box measuring 100 grams and 10 ml?
Answers
Answer:
In order to convert density to grams, you have to put the mass on one side of the equation, and the density and the volume on the other. Therefore, d * v = m. Multiply the density by the volume. Using the example in step 1, you would multiply 2 g/mL by 4mL.
Explanation:
ok