Answer:
13950kg
Explanation:
If we make the system both railroad cars, we know that the momentum of the whole system doesn't change because the forces are internal.
Let a be the mass of the second car.
The original momentum is 9300*15 kg*m/s+ a*0 kg*m/s = 139500 kg*m/s
After sticking together, the momentum is (9300+a)kg*6m/s, which should be equal to 139500 kg*m/s
Therefore (9300+a)*6 = 139500
9300+a = 23250
a = 13950 kg
How much work is done by an applied force to lift a 45 newton block 6.0 meters at a constant speed ?
Answer:
270Joues
Explanation:
Step one:
given data
Force F= 45N
distance moved d= 6m
Required
The work done in moving the block 6m
Step two:
We know that the expression for the work done is
WD= force* distance
WD= 45*6
WD=270Joues
How many moles of water are in 1.5x10^23 molecules of water ?
Answer:
A mole of carbon-12 atoms has 6.022 x 1023 carbon-12 atoms. A mole of apples has 6.022 x 1023 apples.
Explanation:
A satellite moves at a constant speed in a circular orbit about the Earth. Which pair of statements about momentum and kinetic energy are correct.
Answer:
The momentum and the kinetic energy remains constant.
Explanation:
A uniform circular motion is defined as the motion of a body which moves in a constant speed or at the same speed during the motion.
In the context, it is given that a satellite is moving around the earth in a circular orbit at a constant speed. The satellite has certain momentum as well as energy.
We can conclude that the kinetic energy and the momentum of the satellite remains constant as the momentum and kinetic energy depends on the speed of an object And here the speed of the satellite is constant, so the moment as well as the kinetic energy of the satellite remains constant while moving in a circular path.
URGENT Please help ASAP if you see this
Answer:
so it would be 60N divide by 30kg which gives you 20m/s²
Explanation:
Acceleration will increase bc acceleration is the change in speed and direction so if you increase the force it is most to to faster
Read the selection from the section "Cells Carry Information To The Next Generation."
In the 1880s, Walter Sutton and Theodor Boveri identified the chromosome as being responsible for passing down genes from one generation to the next. The discovery forever linked genetics and cytology. Later discoveries further confirmed and solidified the role of the cell in passing characteristics down from one generation to another. One famous example is James Watson and Francis Crick's studies on the structure of DNA. What conclusion is BEST supported by the selection above?
A) Scientists needed much better microscopes in order to discover how genes and cells are related.
B) Scientists needed to find out how cells performed in order to fully understand genetics.
C) Scientists in the 1880s made the most important discoveries in cell research in modern history.
D) Scientists in the 1880s completely reversed all previous understandings about genetics.
The best conclusion that can be arrived at from the passage is that; "Scientists in the 1880s made the most important discoveries in cell research in modern history."
The cell is the smallest unit of an organism that has independent existence. Genetics has to do with the study of the patterns of inheritance in organisms. The scientific research in the 1880s laid a firm foundation for genetics.
Hence, the conclusion that is best supported by the text is that; "Scientists in the 1880s made the most important discoveries in cell research in modern history."
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A bow has k= 458 N/m. It is
pulled back 0.720 m, and used tofire a 0.0925 kg arrow. It hits a bird 24.7 m above the ground. What is the speed of the arrow when it hits?
Answer:
The final speed of the arrow when it hits the target is 45.63 m/s.
Explanation:
Given;
spring constant of the bow, k = 458 N/m
extension of the bow, x = 0.72 m
mass of the arrow, m = 0.0925 kg
let the initial speed of the arrow after being fired = u
Apply the law of conservation of energy, the elastic potential energy of the bow will be converted to kinetic energy of the arrow.
[tex]\frac{1}{2} kx^2 = \frac{1}{2} mu^2\\\\kx^2 = mu^2\\\\u^2 = \frac{kx^2}{m} \\\\u= \sqrt{\frac{kx^2}{m} } \\\\u = 50.66 \ m/s[/tex]
The speed of the arrow when it hits a target 24.7 m above the ground is calculated as;
v² = u² + 2gs
where;
v is the final speed when the arrow hits the target
g is acceleration due to gravity = (-9.8 m/s², upward motion)
v² = 50.66² + 2(-9.8)24.7
v² = 2566.44 - 484.12
v² = 2082.32
v = √2082.32
v = 45.63 m/s
Therefore, the final speed of the arrow when it hits the target is 45.63 m/s.
Which statement describes what happens to rocky shorelines that absorb
energy from ocean waves?
A. The shorelines are strengthened.
B. Solid rock breaks apart.
C. The rocks form a barrier, and the shorelines are not affected.
D. Small rocks and sand block the waves' energy.
Answer:
B. Solid rock breaks apart.
Explanation:
Answer:
B
Explanation:
I did it on a test lol
Which characteristics are common to most salamanders? Check all that apply.
They undergo internal fertilization. They lose their tails as adults. They have wet, moist skin. They have long, strong legs. They begin life with gills.
When Simon goes to the pet store, he plans on getting a new fish for his aquarium.
Using an infinitive, what is the BEST way to revise the underlined words?
A) When Simon goes to the pet store, he plans to get a new fish for his aquarium.
B) When Simon goes to the pet store, he plans for to get a new fish for his aquarium.
C) When Simon goes to the pet store, he plans for getting a new fish for his aquarium.
D) When Simon goes to the pet store, he plans to be getting a new fish for his aquarium.
A baseball player throws a ball borontally, which of the following statements best
describes the balls motion after it is thrown?
Its vertical speed remains the same, and its horizontal speed
increases
o
Its vertical speed increases, and its horizontal speed remains the
O
its vertical speed remains the same, and its horizontal speed
remains the same
Its vertical speed increases, and its horizontal speed increases
T
Answer:
Its vertical speed increases, and its horizontal speed remains the same.
Explanation:
Given that,
A baseball player throws a ball horizontally,
We know that,
A baseball player throws a ball horizontally, then vertical component of gravity will be increases but there is no acceleration in horizontal direction
So, horizontal velocity remains same.
Hence, Its vertical speed increases, and its horizontal speed remains the same.
If a baseball player throws a ball horizontally, the statement which best describes the ball's motion after it is thrown is: B. Its vertical speed increases, and its horizontal speed remains the same.
Speed can be defined as the distance covered by an object per unit time.
Generally, speed has magnitude but no direction and as such it is a scalar quantity.
Mathematically, speed is given by the formula;
[tex]Speed = \frac{distance}{time}[/tex]
For the vertical component of speed:
The vertical speed of an object increases with respect to the distance covered by the object as a result of the effect of acceleration due to gravity.
For the horizontal component of speed:
The horizontal speed of an object remains the same with respect to the distance covered by the object because there isn't any gravitational force acting on it.
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write the name of two substance used to laminate the core of transformer
Answer:
Transformers use “electrical steel” alloys. ... From 1% to 6.5% silicon is added, as well as a small amount (up to 0.5%) of manganese and aluminum to reduce brittleness in alloys with higher percentages of silicon. Electrical steels are formulated and processed to have low hysteresis and eddy-current losses.
Explanation:
The eddy currents consume energy and heat the iron core. The designers of the electrical machines and transformers laminate the core with thin sheets of iron coated with a thin oxide layer.
To reduce Eddy current loss in the transformer, the iron core is constructed of laminated silicon steel and has a unique insulated coating.
What is used to laminate the core of a transformer?Instead of employing a solid iron block, this can be accomplished by laminating the core, which is constructed from a collection of metal plates that are adhered together.
With less current flow, efficiency loss, and heat waste, this has the desired effect of raising electrical resistance inside the core. Low hysteresis and eddy-current losses are achieved by the formulation and processing of electrical steels.
The iron core is heated by the eddy currents, which use energy. The core of electrical devices and transformers is laminated with thin sheets of iron covered in a thin oxide layer by the designers.
Therefore, Transformers use alloys known as “electrical steel.” To lessen brittleness in alloys with larger percentages of silicon, between 1% and 6.5% silicon is added, along with a tiny amount (up to 0.5%) of manganese and aluminum.
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If you want to make a flashlight and have two batteries and a light bulb how would you hook them up to make it bright and why?
Answer:
The positive end of battery 1 touching the negative end of battery 2 and wires connecting the negative of battery 1 to the light light bulb and the positive of battery 2 to the light bulb.
Explanation:
Why do a hammer and a feather fall at the same rate on the moon but not on the earth?
Answer:
it is because of the differences in medium.
Explanation:
on the moon the medium is in a vaccum. there is no air resistance. therefore they fall at the same time.
How does forces affect acceleration?
a. If force doubles, then acceleration doubles.
b. If force doubles, then acceleration halves.
c. If force doubles, then acceleration does not change
a
a
a
a
it all depends on you moving the object
Marcus was asked to find out what affects the strength of electromagnets. He was given a simple electromagnet made from a coil of wire and a power supply.
What variables could Marcus investigate?
current passing through wire
number os turns on core
the nature of the core material
the shape and size of the core or the material
Describe the shape of a convex lens and a concave lens. Describe what effects each type of lens has on light. Then describe how you might use these types of lenses
PLEASE HURRY I AM IN A SCIENCE TEST DUE AT 1:30
Answer:
Explanation:
Convex lens refers to the lens which merges the light rays at a particular point, that travels through it.
Concave lens can be identified as the lens which disperses the light rays around, that hits the lenses.
Draw Graph for the derivation of three equations of Motion
Answer:
Hey mate I shall not tell you the answer I shall explain it to you after this if still you can't understand then say
Explanation:
Derive v = u + at by Graphical Method. Consider the velocity – time graph of a body shown in the below Figure
Derive s = ut + (1/2) at2 by Graphical Method. Velocity so time graph to derive the equations of motion.
Derive v2 = u2 + 2as by Graphical Method. Velocity–Time graph to derive the equations of motion.
I hope you understand now
enjoy your day
#Captainpower :)❤❤
Convection is heat transfer in ——————-.
Answer:
fluids
Explanation:
the movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat.
_________________________________
Convection Is Heat Converted Into Vapour_________________________________
C
с
A car with mass 1372 kg, moving at 26 m/s,
strikes a(n) 2630 kg car at rest.
If the two cars stick together, with what
speed do they move?
1. 5.59706
2. 10.3342
w
3. 6.24855
4. 5. 10299
5. 6.60538
6. 8.91354
7. 5.24686
8. 7.31238
9. 1.83881
10. 12.8712
Answer in units of m/s.
СС
5
Answer:
constant volicty of the pumper when they hit ground 7.03-/s
A truck skids for a distance of 25 m with the road pushing on its tires with force of 1500 N as its brakes
are applied.
What is the change in kinetic energy for the truck?
Round the answer to two significant digits.
J
Answer: -38000 J
Explanation:
Khan approved
The truck skids to a distance of 25 meters with a force of 1500 N then the change in kinetic energy for the truck will be equal to 37,500 J.
What is kinetic energy?The force which a moving object has is referred to as kinetic energy in physics. It is defined as the number of effort required to propel a person of a specific mass from still to a specific velocity. Aside from slight fluctuations in speed, your body holds onto the kinetic energy it obtains during acceleration.
When the body slows down from its present level to a condition of rest, the exact same quantity of energy is used.
Formally, kinetic energy is any quantity that has a gradient with respect to time in the Lagrangian of a system.
As per the given data in the question,
Force, F = 1500 N
Distance, d = 25 m
Use the equation for change in kinetic energy:
Δ K.E = F × d
= 1500 × 25
Δ K.E = 37,500 J.
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С
A rocket of mass 1000 kg is travelling through the atmosphere.
The force due to its engine is 1200 N, and the drag force and friction equal 400 N.
The resultant force is 800 N. Calculate its acceleration.
Show your working and give the units. Use the equation:
force
acceleration =
mass
Answer:
a = 0.8 [m/s²]
Explanation:
To solve this problem we must use Newton's second law which tells us that the resulting force on a body is equal to the product of mass by acceleration, in this way we come to the following equation:
∑F = m*a
where:
F = forces applied [N]
m = mass = 1000 [kg]
a = acceleration [m/s²]
Now using Newton's second law.
[tex]1200 - 400 = 1000*a\\800 = 1000 *a\\a=0.8[m/s^{2} ][/tex]
ANYONE KNOW NUMBER 1?
Answer:
A increases
Explanation:
#CarryOnLearning
95 POINTS PLEASE HELP SIMPLE QUESTION
A student and the waxed skis she is wearing
have a combined weight of 850 newtons.
The skier travels down a snow-covered hill
and then glides to the east across a snow-covered, horizontal surface.
2. Determine the magnitude of the normal force exerted
by the snow on the skis as the skier glides across the
horizontal surface.
3. Calculate the magnitude of the force of friction acting on the skis as the skier glides across the snowcovered, horizontal surface. [Show all work, including
the equation and substitution with units.]
I already know 2 is 850. But how do you get the coefficient of friction for 3. brainliest to best answer!
Given that,
Combined weight of a student and the waxed skis, W = 850 N
It should be given that the coefficient of friction is 0.05.
To find,
The magnitude of the normal force exerted and the magnitude of the force of friction.
Solution,
Normal force = weight of the object,
Here, weight = 850 N
Normal force = 850 N
Let f is the force of friction. It can be calculated as follows :
[tex]f=\mu N\\\\=0.05\times 850\\\\=42.5\ N[/tex]
Hence, the normal force is 850 N and the magnitude of the force of friction is 850 N.
Answer: 43
Explanation:
MacGyver is riding on a skateboard and moving west of the velocity of 7 m/s. Macgyver has a mass of 92 kg and the skateboard has a mass of 8kg. if MacGyver jumps off the skateboard and velocity of 2 m/s east, What will the final velocity of the skateboard be? Show your work.
Answer:
64.5
Explanation:
(m1 + m2) v initial = (m1 * v1 final) + (m2 * v2 final)
(92 + 8)(-7) = (92 x 2) + (8 x v2 final)
(100)(-7) = (184) + (8 x v2 final)
-700 = (184) + (8 x v2 final)
-516 = (8 x v2 final)
-516/8 = v2 final
-64.5 = v2 final
What are valence electrons?
A. Electrons that determine what kind of element an atom is
B. Electrons at the very center of an atom
C. Electrons that are not involved in bonding
D. Electrons in an atom that can bond with other atoms
Answer:
The correct answer is D. Electrons in an atom that can bond with other atoms.
Explanation:
For those of you that need it still
An applied force of 20 N accelerates a block across a level,frictionless surface from rest to a velocity of 8.0 m/s in a time of 2.5 s. Calculate the work done by this force.
Answer:
workdone = force × distanceExplanation:
let's find the acceleration
[tex]v = u + at \\ 8 = 0 \times a \times 2.5 \\ \alpha = 3.2m {s}^{ - 2} [/tex]
then distance
[tex] {v}^{2} = {u}^{2} + 2as \\ {8}^{2} = 2 \times 3.2 \times s \\ \\ s = 10m [/tex]
w = f ×d = 20 × 10 = 200J
Ava lives in Miami, and after a hurricane passed over the city, heavy rains developed and Miami flooded. Why are floods so
destructive?
a. they cause water to remain for a long time because the ground is saturated and it doesn’t run off quickly.
b. flood waters remain for a short time and can happen with very little warning.
c. floods often drain surrounding areas and can bring more flooding.
d. flooding often occurs at night and the flood waters can’t be seen.
Help me with this homework
Answer:
4. The reading decreases because part of your weight is applied to the table and the table exerts a matching force on you that acts in the direction opposite to your weight.
Explanation:
When you push on anything, Newtons Third Law comes into effect: "when two objects interact, they apply forces to each other of equal magnitude and opposite direction." So pretty much, the table you are putting some of your weight on is taking some of the downward force and in return the scale isn't going to push up with as much force.
I'm not the best at explaining, but im in physics right now and thats somewhat how my teacher explained it.
THANK YOU SO MUCH PICTURE IS BELOW
Answer:”a” or “d”
Explanation:
I say it will not move because they are moving the objects in the same equal of force so it will most likely stay motionless or might rotate toward the two of the students according to the amount of force they are using
5.Which of the following statements is not true? *
A.Protons have a positive charge.
B. Neutrons have a negative charge.
C.Neutrons have no charge.
Answer:
neutrons have a negative charge is incorrect
Explanation:
neutrons are neutral
Answer:
Explanation:
Neutrons and protons are found in the nucleus of an atom. Unlike protons, which have a positive charge, or electrons, which have a negative charge, neutrons have zero charge which means they are neutral particles.