660 newtons
830 newtons
no
additional force would be 350 newtons
An 18 000-kg freight car travelling 1.75 m/s[E] collides with a 27 000-kg freight car at rest. After the collision, the freight cars stick together. What is the velocity of the freight cars after the collision?
Answer:
The velocity of the freight cars after collision is 0.7 m/s
Explanation:
Given;
mass of the first freight car, m₁ = 18000 kg
initial speed of the first freight car, u₁ = 1.75 m/s
mass of the second freight car, m₂ = 27000 kg
initial speed of the second freight car, u₂ = 0
Let the velocity of the freight cars after collision = v
Apply the principle of conservation of linear momentum;
m₁u₁ + m₂u₂ = v(m₁ + m₂)
18000(1.75) + 27000(0) = v(18000 + 27000)
31500 = 45000v
v = 31500 / 45000
v = 0.7 m/s
Therefore, the velocity of the freight cars after collision is 0.7 m/s
The shape of a mineral has to do with
A.
its smell.
B.
its color.
C.
the way its crystals are formed.
D.
how easy it is to scratch.
Answer:
C is the correct answer
Im so bad at physics pls help I am so close to failing.
Answer:
the canon would be blasted .4/6 miles bc it s half of 9.8 which shows its signifigant expretion on the decimal point weather its a posative or negative
Explanation:
Hopefully this helped, if not HMU and I will try my best to get u a better answer!
Have a great day! :)
And if ur failing and u need help I can help u, no points needed :)
Witch one goes to witch
gas giants and ice giants
asteroids and terrestrial planets
comets and ice giants
meteoroids and asteroids
Bodies composed primarily of frozen gases
Planets composed of lighter elements compounds
bodies composed primarily of metal and rock
Rocky and metallic bodies smaller than planets
hope it helps!
WHATS THE ANSWER HELP!!
5m I think,maybe, not a 100% sure die
Answer:
5m i think
Explanation:
WHATS THE ANSWER HELP!!
A solid weight 277.5g in air and 212.5g when totally immersed in the liquid of density 0.9 g/cm³.Calculate the density of solid.
help me Asap!!
Explanation:
Here is the answer,
Lets be BF
The density of solid is 3.842 g/cm³.
What is Density ?
Density is the measurement of how tightly a material is packed together. It is defined as the mass per unit volume.
Density Symbol: D or ρ Density Formula: ρ = m/V, where ρ is the density, m is the mass of the object and V is the volume of the object.
Weight in air = 277.5Weight in water = 212.5Displaced Weight = 277.5 - 212.5
= 65 gm
Density = 0.9 g/cm³
Mass = 65 gm
Volume = Mass / Density
= 65 / 0.9
= 72.22 cm³
Now,
Density of Solid = 277.5 / 72.22
= 3.842 g/cm³.
Hence , The density of solid is 3.842 g/cm³.
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Red: Distance = 3 x Time
Blue: Distance = 2 x Time
A student is asked to predict the time it would take for the blue marble to travel 4 meters. What is the time?
Why don't protons stick together?
Answer:
The protons must feel a repulsive force from the other neighboring protons. This is where the strong nuclear force comes in. ... If they can't get that close, the strong force is too weak to make them stick together, and other competing forces (usually the electromagnetic force) can influence the particles to move apart.^o^
Answer:
Because, they are of the same charge that is, + and +, + can't go with another +.
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Thank You!!
wavelength of the wave if its frequency is 12.0 hertz and its speed is 1.2 meters per second?
Answer:
0.1m
Explanation:
Given parameters:
Frequency = 12hz
Speed = 1.2m/s
Unknown:
Wavelength of the wave = ?
Solution:
The wavelength of the wave can be derived using the expression below;
V = f∧
V is the speed of the wave
f is the frequency of the wave
∧ is the wavelength
So;
∧ = [tex]\frac{Velocity}{frequency}[/tex]
Now, insert the parameters and solve;
∧ = [tex]\frac{1.2}{12}[/tex] = 0.1m
A student is cooking macaroni and cheese for dinner. The student places a pot on the stove, boils water in the pot, places noodles in the boiling water, and watches the noodles float and sink in the pot. Explain the types of heat transfer that are occurring as the student cooks the noodles.
Answer:
Conduction.
Convection.
Radiation.
Two wires of diameter 0.25 cm, one made of steel and the other made of brass are loaded as shown in Fig. The unloaded length of steel wire is 1.5 m and that of brass wire is 1.0 m. Compute the elongations of the steel and the brass wires. Given youngs modulus of steel = 2×10 ^−11 Pa and that of brass is 0.9×10 ^−11
Pa.
Explanation:
hope this will help u
Answer:
I'll take this one also
when is the cats average accelerstion from 12 to 24 seconds
FIRST ONE TO GET IT RIGHT WILL GET 25 POINTS
Answer:
8
Explanation:
im gonna say 8 because the peak of the line would be at 8 not to sure 0-0
Which sentence best explains the difference between potential energy and
kinetic energy?
A. Potential energy is related to an object's position, and kinetic
energy is related to its motion.
B. Potential energy is related to an object's motion, and kinetic
energy is related to its position.
C. Potential energy is related to an object's position, and kinetic
energy is related to the arrangement of its particles.
O D. Potential energy is related to an object's shape, and kinetic energy
is related to its position.
Answer:
C. Potential energy is related to an object's position, and kinetic
Explanation:
The energy contained in the small motions of the object's molecules can be broken up into a combination of microscopic kinetic energy and potential energy.
Answer:
c. potential energy is related to an object's position, and kinetic energy is related to its motion
Explanation:
In many situations, energy is lost to the work done by friction. But the law of conservation of energy says energy cannot be created or destroyed. So where does the "lost" energy go?
Answer:
Heat energy
Explanation:
The seemingly lost energy due to the work done by friction is lost to heat energy.
When we account for heat energy of the system, it is clearly seen that it is not lost as we perceive it.
The law of conservation of energy also suggests that energy is transformed and neither lost nor created. The work done by friction is transformed into heat energy of the system.3. When two liquids are mixed and a solid
forms as a reaction, the solid is called a
A. precipitate
B participant
C. percipitate
D. polypeptide
And why ?
Answer: A; Precipitate
Explanation:
The radio waves that travel through the air to our car/truck/home radios are just another type of light. Let's say that your favorite radio station is 87.9 on the FM dial. That means that those radio waves have a frequency of 87.9 MHz. (a) What are the wavelength and energy of those radio waves? (b) How fast would these radio waves travel through water?
Answer:
Explanation:
(a) Electromagnetic waves travels at the speed of light = 3.0 x [tex]10^{8}[/tex] m/s.
v = fλ
where v is the velocity of the wave, f is the frequency, and λ wavelength.
So that;
λ = [tex]\frac{v}{f}[/tex]
= [tex]\frac{3.0*10^{8} }{87.9*10^{6} }[/tex]
= 3.413 m
ii. Enegy of the wave can be determined by;
E = hf
where h is the Planck's constant and f the frequency of the wave.
E = 6.626 x [tex]10^{-34}[/tex] x 87.9 x [tex]10^{6}[/tex]
= 5.82 x [tex]10^{-26}[/tex] J
(b) Refractive index of water = [tex]\frac{velocity of light in air}{velocity of light in water}[/tex]
velocity of light in water = 1.33 x 3.0 x [tex]10^{8}[/tex]
= 3.99 x [tex]10^{8}[/tex] m/s
The diagram shows a sealed container, which
represents a closed system.
How would the system change if the container were
placed on a hot plate?
O Some kinetic energy would be produced.
O Some kinetic energy would be destroyed.
O The kinetic energy of the molecules would increase.
O The kinetic energy of the molecules would decrease.
Molecules
Answer:
The kinetic energy of the molecules would increase.
Explanation:
Answer:
C. The kinetic energy of the molecules would increase.
Explanation:
On Edge 2021
Kate gathered three boxes of the same size made of different materials: glass, clear plastic, and aluminum painted black. She placed them on a window sill in the sun for an hour and then measured the warmth of the air in each box. In this experiment, the time of an hour is a(n) _____.
A. Dependent Variable
B. Constant
C. Independent Variable
D. Control
In this experiment, the time of an hour is an independent variable, therefore the correct answer is option C
What is thermal energy?Thermal energy sometimes referred to as heat energy, may be described as the type of energy in which heat is transmitted from one body to another body as a result of their molecular motions.
As given in the problem Kate gathered three boxes of the same size made of different materials: glass, clear plastic, and aluminum painted black. She placed them on a window sill in the sun for an hour and then measured the warmth of the air in each box.
As stated, all three boxes were put on the window for the same amount of time—an hour—so since the time duration for the experiment was the same, it may be considered an independent variable.
Thus, In this experiment, the time of an hour is an independent variable, therefore the correct answer is option C.
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A force of 5N pushes a ball to the right, and a force of 7N pushes the ball to the left. How will the forces affect the ball’s motion?
answer:- external force is 2 N .
The force that impacts the ball motion is external force i.e. 2N.
Given that,
A force of 5N pushes a ball to the right. And a force of 7N pushes the ball to the left.Based on the above information, the calculation is as follows:
= 7N - 5N
= 2N
This 2N represents the external force.
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An escalator and an elevator can transport a person from one floor to the next. the escalator does it in 15 s and the elevator takes 10 s. Which does more work on the person? Which has the greater power output?
Answer:
The escalator does more work and the elevator has a greater power output.
Explanation:
The escalator does more work on the person because it is carrying them up. It also gives the person a chance to walk up the escalator making it a little more challenging than using just an elevator. The elevator has a greater power output because it can transport a person from one floor to another in just 10 seconds where as the escalator can do it in 15.
Hope this helps!
Energy Calculation 4. What is the gravitational potential energy of an object that has a mass of 100kg it is 10m off of the ground? The gravity on Earth is measured at 9.8N/kg
lonic compounds form because ______ attract.
Plz help I need this now! :)
Answer:
I believe it is either Metals or Nonmetals
Explanation:
Hope this helped, Have a Wonderful Day/Night!!
Sa ma ajute cineva va rog mult Ce cantitate de apă poate fi încălzită de la temperatura t 1 = 10 0 C la temperatura finală T 2 = 293, 15 K, dacă i se furnizează căldura de 41850 J ? Se dă căldura specifică a apei : c apă = 4185
Răspuns:
1000 kg
Explicaţie:
Date date
t1 = 10 ° C
t2 = 293,15K = până la grad = 293,15-273 = 20,15 ° C
= 20 ° C aproximativ
Q = 418kJ = 418000J
c = 4180J / kg ° C
m =? Kg
Necesar:
Masa m în kg
Pasul doi:
Formulă:
Q = c * m * Δt
Q = c * m * (t2 -t1)
m = Q / c * (t2-t1)
Calculati:
m = 418000/4180 * (20-10)
m = 100 * 10 kg
m = 1000 kg
At the first Democratic Party convention of 1860, fifty Southern delegates refused to vote and left the convention. voted to secede from the Union. nominated their own candidate. decided to become Republicans.
Answer:
A) refused to vote and left the convention.
Explanation:
At the first Democratic Party convention of 1860, fifty Southern delegates refused to vote and left the convention
Answer:
The answer is A
Explanation:
got it right edge 2021
A hiker leaves her camp and walks 3.5 km in a direction of 55° south of west to the lake. After a short rest at the lake, she hikes 2.7 km in a direction of 16° east of south to the scenic overlook.
What is the magnitude of the hiker’s resultant displacement? Round your answer to the nearest tenth.
km
What is the direction of the hiker’s resultant displacement? Round your answer to nearest whole degree.
° south of west
Answer:
The magnitude of the hiker’s resultant displacement is 5.6 km
The direction of the hiker’s resultant displacement is 77 degrees south west! Hope this helps!!!
what is force?what are the type of force?
Answer:
There are 2 types of forces, contact forces and act at a distance force. Forces. Every day you are using forces. Force is basically push and pull. When you push and pull you are applying a force to an object.The Four Fundamental Forces of Nature
Gravity.
The weak force.
Electromagnetism.
The strong force.
A block of mass 3 kg slides along a horizontal surface that has negligible friction except for one section, as shown above. The block arrives at the rough section with a speed of 5 m/s and leaves it 0.5 s later with a speed of 3 m/s.
Complete Question
The complete question is shown on the first uploaded image
Answer:
The value is [tex]F_f = 3 * -4[/tex]
Explanation:
From the question we are told that
The mass of the block is [tex]m = 3 \ kg[/tex]
The initial speed of the block before entering the rough section is [tex]u = 5 \ m/s[/tex]
The time taken is t = 0.5 s
The speed with which the block leaves the rough section is [tex]v = 3 \ m/s[/tex]
Generally from kinematic equation
[tex]v = u + at[/tex]
=> [tex]a = \frac{v - u }{t}[/tex]
=> [tex]a = \frac{3 - 5 }{0.5}[/tex]
=> [tex]a = - 4[/tex]
Generally the magnitude of the average frictional force is mathematically represented as
[tex]F_f = m * a[/tex]
=> [tex]F_f = 3 * -4[/tex]
=> [tex]F_f = -12 \ N[/tex]
The negative sign show that the force is acting in the opposite direction to the direction of motion of the block
The frictional force between the block and the horizontal surface is 12.1 N.
The given parameters;
mass of the block, m = 3 kginitial speed of block, u = 5 m/stime of motion, t = 0.5 sfinal speed, v = 3 m/sThe acceleration of the block is calculated as follows;
[tex]a = \frac{\Delta v}{t} \\\\a = \frac{5- 3}{0.5} \\\\a = 4 \ m/s^2[/tex]
The coefficient of friction between the block and the horizontal surface is calculated as;
[tex]\mu_k = \frac{a}{g} \\\\\mu_k = \frac{4}{9.8} \\\\\mu_k = 0.41[/tex]
The frictional force between the block and the horizontal surface is calculated as follows;
[tex]F_f = \mu_k F_n\\\\F_f = \mu_k mg\\\\F_f = 0.41 \times 3 \times 9.8\\\\F_f = 12 .1 \ N[/tex]
Thus, the frictional force between the block and the horizontal surface is 12.1 N.
"Your question is not complete, it seems to be missing the following information;"
A block of mass 3 kg slides along a horizontal surface that has negligible friction except for one section, as shown above. The block arrives at the rough section with a speed of 5 m/s and leaves it 0.5 s later with a speed of 3 m/s. What is the magnitude of the average frictional force exerted on the block by the rough section of the surface?
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When the velocity of a liquid flowing steadily in a tube increases what happens to the pressure
Bernoulli's Principle states that as the speed of a moving fluid increases, the pressure within the fluid decreases. The Bernoulli's Principle explains the behavior of an ideal fluid passing through a pipe or enclosed passageway such a pump.
By what factor will the Electrostatic Force between two charged objects change when the amount of charge on both objects doubles AND the distance between the two charged objects triples?
Answer:
F' = (4/9)F
Explanation:
The electrostatic force between two charged objects is given by Coulomb's Law:
F = kq₁q₂/r² -------------------- equation (1)
where,
F = Electrostatic Force
k = Coulomb's Constant
q₁ = magnitude of first charge
q₂ = magnitude of second charge
r = distance between charges
Now, when the charges and distance altered as follows:
q₁' = 2q₁
q₂' = 2q₂
r' = 3r
Then,
F' = kq₁'q₂'/r'²
F' = k(2q₁)(2q₂)/(3r)²
F' = (4/9)kq₁q₂/r²
using equation (1):
F' = (4/9)F
A driver travels 225 miles in 4 hours and 30 minutes. What was his average speed in mph?
Answer:
195 is it current pls tell