Answer:
1500kg
Explanation:
Initial velocity(u)=0m/s
Final velocity(v)=20m/s
Time taken=5s
Acceleration=v-u/t
Acceleration=20-0/5=4m/s^2
Force=6000N
Mass=?
Mass=Force/acceleration
= 6000/4
=1500kg
Two trains each of length 100m are running on two parallel trucks .One train overtakes the other in 20s and one train crosses the other in 10s.Calculate the velocity of each train
Answer:
The velocity of one of the trains is 15 m/s
The velocity of the other train 5 m/s
Explanation:
The given parameters of the two trains and the motion of the trains are;
The length of each train, l = 100 m
The time it takes one train to overtake the other, Δt₁ = 20 s
The time it takes the one train to cross the other, Δt₂ = 10 s
Let 'v₁' represent the velocity of one of the trains, and let 'v₂' represent the velocity of the other train, we have;
When one train overtakes the other, the trains are moving in the same direction and the relative velocity of the overtaking train, v = v₁ - v₂
The distance the train travels when overtaking or crossing, d = 2 × l
∴ d = 2 × 100 m = 200 m
d = 200 m
Therefore, we get;
v = v₁ - v₂ = d/Δt₁ = (200 m)/(20 s) = 10 m/s
∴ v₁ - v₂ = 10 m/s [tex]{}[/tex] Equation (1)
When one train crosses the other train, the trains are moving in opposite directions on the different tracks, therefore, we have;
For the overtaking trains, v = v₁ + v₂ = d/Δt₂ = (200 m)/(10 s) = 20 m/s
∴ v₁ + v₂ = 20 m/s [tex]{}[/tex] Equation (2)
Adding equation (1) to equation (2) gives;
v₁ - v₂ + v₁ + v₂ = 2·v₁ = 10 m/s + 20 m/s = 30 m/s
∴ v₁ = 30 m/s/2 = 15 m/s
The velocity of one of the trains, v₁ = 15 m/s
From equation (2), we have;
v₁ + v₂ = 20 m/s
v₂ = 20 m/s - v₁
∴ v₂ = 20m/s - 15 m/s = 5 m/s
The velocity of the other train, v₂ = 5 m/s.
A 7.0 kg mass is lifted 4.0 m above the ground. Find the change in gravitational energy.
[tex]\mathfrak{\huge{\orange{\underline{\underline{AnSwEr:-}}}}}[/tex]
Actually Welcome to the concept of Graviatoonal Energy.
P = mgh
hence,
E = (7)*(9.8)*(4) = 274.4 joules
==> Energy = 274.4 J
The mirror is a opaque object. When light hits the mirror, a small amount is reflected and converted to thermal energy, while most of the light waves are
1. absorbed
2. transmitted
3. reflected
Answer:
3.When light incidents on a mirror , the most of the light waves are reflected.
Explanation:
What is mirror ?Mirror is a simple device that reflects light. It is an opaque object.It allows reflection but also absorb some amount of light waves.It also convert small amount of reflected rays in thermal energy.https://brainly.com/question/10507280
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Assignment
S
of
write the Symbol
Told, mercury and
Cooper, Iron,
Lead
Answer:
Check explanation
Explanation:
Gold - Au (Aurum)
Mercury - Hg (Hydrargyrum)
Copper - Cu (Cuprum)
Iron - Fe (Ferrum)
Lead - Pb (Plumbum)
These elements in the periodic table are some of the elements represented by letters not in line with their names.
This is because, these elements were known in ancient times and therefore, they are represented by letters from their ancient names.
How much gravitational potential energy has a boy whose mass is 50 kg and
who is standing on top of a 2.5 meter high wall?
a. none of these
b. 0735 j
c. 2115 j
d. 196
Answer:
Gravitational potential=mgh
=50×10×2.5
=1250J
option a
Two Brothers are playing soccer on the beach. One brother kicks the ball really hard and the ball lands in the water, about 50 meters from the beach. They wonder if the ball will float back to the beach.
Answer:
Due to wind and waves of water.
Explanation:
They wonder that the ball will float back to the beach because of the wind and the waves of the water. The wind blows towards the beach which moves the water in the form of waves towards the beach so if the ball lands in the water, it will floats on the surface of water and move towards the beach with the help of wind and waves of the sea. The ball floats on the water due to its lighter weight and lower density as compared to water.
PLSSSSS HELPPPPP HELPPPPP
When did whale ancestors begin living full time in the water?
a.
After they nursed under water
b.
After they lost their hind legs
c.
Before they evolved gills
d.
Before they began eating a carnivorous
diet
4. When a key on piano is pressed, a sound is heard. What produces this sound?
A. the vibrating key of the piano
B.
The Vibrating String Of Piano
C. the finger pressing the piano key
D. the air molecules inside the piano
Answer:
D
Explanation:
since we press the key , air molecules ate presented and sound wave is formed what we hear.
Answer:
B
Explanation:
the vibrating string of pianoSi un conductor tiene una longitud de 4 metros y una sección de 2 mm^2 calcule su resistencia, si su coeficiente de resistividad es de 0.10(Ωmm^2/m)
Answer:
R = 0.2 Ω
Explanation:
Para aplicar el concepto de resistencia de un conductor electrico, consideramos la siguiente formula:
R = ρ . l / S
Donde l es la longitud del conductor
S la superficie
y ρ el coeficiente de resistividad
Primero necestiamos hacer ciertas conversiones:
ρ = 0.10 ×10⁻⁶ (Ω . m²/m)
S = 2 mm² → 2 ×10⁻⁶ m²
R = 0.10 ×10⁻⁶ (Ω . m²/m) . 4m / 2 ×10⁻⁶ m²
Dentro de la formula simplificamos las unidades, los metros de ρ con la longitud y ambos m². De esa forma la unidad de R queda en Ω (ohmios).
Resolvemos:
R = 0.10 ×10⁻⁶ Ω . 4 / 2 ×10⁻⁶
R = 0.2 Ω
True or false: balanced forces are important for a hoverboard to float.
True
False
Answer:
True its got to be true
Explanation:
how else does a hoverboard float lol
Answer:
It's true
Explanation:
So true..
Who discovered natural magnet for the first time?
Which of the following could be included in your gamer's creed that would help keep gamers safe?
A. I will work hard and play harder. Games are my life.
B. I will use privacy features that gaming sites provide to ensure I do not share personal information with strangers.
C. I will do whatever I can to win games I play online.
D. I will share the game equally with my friends and family.
swered
Answer:
The answer is B. I will use privacy features that gaming sites provide to ensure I do not share personal information with strangers.
Explanation:
It keeps you safe online
Answer: the answer is b
Explanation:
The value of gravitational pull on the moon is 1.6 m/s/s. What is the weight of a 75 kg
astronaut on the moon?
Answer:
120N
Explanation:
Weight=mass x acceleration due to gravity (on the planet)
Mass of an astronaut is 75kg and value of acceleration due to gravity on moon is 1.6m/s2
Weight of astronaut on moon=mass of astronaut x value of acceleration due to gravity on moon
75kg x 1.6m/s2
=120N
A current of 0.225 A flows across an 85.5 Ohm resistor. How much voltage is being applied?
Answer:
19.24 volts
Explanation:
From Ohm's law,
Applying,
V = IR.................. Equation 1
Where V = Voltage applied, I = currentflowing across the resistor, R = Resistance
From the question,
Given: I = 0.225 A, R = 85.5 Ohm
Substitute these values into equation 1
V = (0.225×85.5)
V = 19.24 volts
Hence the Voltage applied is 19.24 Volt
Answer:
19.24
Explanation:
acellus
Standing on the surface of the earth you have a weight of 100 N. If you were to travel until you were 2
earth radii above the surface of the earth your weight would be?
b.) 11 N
c.) 25N
d.) 50 N
e.) about 100N
a.) 0N
Answer:
E
Explanation:
Question 1 (1 point)
All solid objects will deform when enough force is applied.
O True
False
Answer:
Solid objects will deform when adequate loads are applied to them; if the material is elastic, the object will return to its initial shape and size after removal. This is in contrast to plasticity, in which the object fails to do so and instead remains in its deformed state.
Explanation:
Answer:
It is false
Explanation:
because when it like a rolling ball it can deform no matter what unlesss you throw it at the ground really hard then it breaks but a soft or sometimes metal yeah it can deform but not all things solid deform.
what does it mean to "conserve money" or to "conserve resources"
Answer:
Conserve money means to save money. Conserve resources means the same thing but with resources; so conserve resources means to save resources.
Explanation:
I need help
With this
Answer:
dfvgxbcjnhmv,kbl
Explanation:
fvgbnhjmk
Direction: Write TRUE if the statement is correct, and FALSE if it is not
correct
3. When light strikes a black surface, it is reflected by the surface and
nothing is absorbed.
4. Mirrors are used in telescopes because they have the ability to reflect
5. Transmission in the passing of light through some materials
-----------------------------------------------------------------------------------------------------------------
When light strikes a black surface, it is reflected by the surface and
nothing is absorbed This would be False because black absorbs the light not reflect
Mirrors are used in telescopes because they have the ability to reflect
True? Telescopes designed with mirrors avoid the problems of refracting telescopes. Because the light is reflected from the front surface only, flaws and bubbles within the glass do not affect the path of the light
Transmission in the passing of light through some materials
False? Some materials allow much of the light that falls on them to be transmitted through the material without being reflected. Materials that allow the transmission of light waves through them are called optically transparent. ... Materials which do not allow the transmission of any light wave frequencies are called opaque.
Match each concept to the scientist who supported it.
Thomas Young
Light is a wave that has similar properties
as radio waves
Christiaan Huygens
Light is a wave made of electric and
magnetic fields.
James Clerk Maxwell
Light is a wave because this property can
explain interference.
Heinrich Hertz
Light is a wave because it bends when it
hits barriers and openings.
Isaac Newton
Light is made of particles because it travels
only in straight paths.
Answer:
1. Heinrich Hertz.
2. James Clerk Maxwell.
3. Thomas Young.
4. Christiaan Huygens.
5. Isaac Newton.
Explanation:
Light wave can be defined as an electromagnetic wave that do not require a medium of propagation for it to travel through a vacuum of space where no particles exist.
However, the various definitions of light according to early scientists include the following;
1. Heinrich Hertz: Light is a wave that has similar properties as radio waves. Heinrich Rudolf Hertz was a German physicist born on the 22nd of February, 1857 in Hamburg, Germany. The unit of frequency ("Hertz") of an electromagnetic wave was named after him.
2. James Clerk Maxwell: Light is a wave made of electric and magnetic fields. James Clerk Maxwell was a Scottish physicist born on the 13th of June, 1831 in Edinburgh, United Kingdom. He was famously known for his work in the formulation of the classical theory of electromagnetic radiation.
3. Thomas Young: Light is a wave because this property can explain interference.
4. Christiaan Huygens: Light is a wave because it bends when it hits barriers and openings.
5. Isaac Newton: Light is made of particles because it travels only in straight paths.
Answer:
See image
Explanation:
Light wave can be defined as an electromagnetic wave that do not require a medium of propagation for it to travel through a vacuum of space where no particles exist.
However, the various definitions of light according to early scientists include the following;
1. Heinrich Hertz: Light is a wave that has similar properties as radio waves. Heinrich Rudolf Hertz was a German physicist born on the 22nd of February, 1857 in Hamburg, Germany. The unit of frequency ("Hertz") of an electromagnetic wave was named after him.
2. James Clerk Maxwell: Light is a wave made of electric and magnetic fields. James Clerk Maxwell was a Scottish physicist born on the 13th of June, 1831 in Edinburgh, United Kingdom. He was famously known for his work in the formulation of the classical theory of electromagnetic radiation.
3. Thomas Young: Light is a wave because this property can explain interference.
4. Christiaan Huygens: Light is a wave because it bends when it hits barriers and openings.
5. Isaac Newton: Light is made of particles because it travels only in straight paths.
Where is an object's center of gravity?
The center of gravity (CG) location is the average location of all the weights of an object. The center of gravity is the balance point of an object, also expressed as the point where all the mass appears to be located.
The location of the body's center of gravity is where its mass is concentrated. The human body's center of gravity is a fictitious position where the gravitational force is claimed to appear to act (COG). It is where the body's overall bulk seems to be concentrated.
What is an object's center of gravity?The center of gravity of an object is the point at which its weight is most evenly distributed. Any object's travel through space may be completely explained in terms of how its center of gravity moves from one location to another and, if it is free to spin, how it rotates around that center of gravity.
Therefore, In physics, the center of gravity is a hypothetical location within a solid where, for the sake of convenience in some computations, the body's whole weight may be assumed to be concentrated.
Learn more about center of gravity here:
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The SI unit for pressure is the
Answer:
The SI unit of pressure is Pascal .
A magnetic material would always be what to a magnet
Answer:
attractive/magnetic
mark me brainliestt :))
What is electrical resistance and types of electrical resistance
Answer:
Electrical Resistance is a measure of the opposition to current flow in an electrical circuit
Types: variable resistance and set resistance
Explanation:
1 7 points If you take less time to perform a task, you have less power output. O True O False
True
The rate at which work is done is referred to as power. A task done quite quickly is described as having a relatively large power. The same task that is done more slowly is described as being of less power. Both tasks require he same amount of work but they have a different power.
A student practicing for a track meet ran 250 m in 30 sec
Answer:
v= 8.3 m/ s^-1
Explanation:
S=vt
v= S/t
v= 250 m/ 30 s
v= 8.3 m/ s^-1
R=70
R-40
M
120V
R, 90
W
Answer:
please type full question. Does not mean what you are trying to saying.5. How do you represent the strength of a force in a free-body diagram?
How can you stay safe on the Internet?
A. Create a screen name that includes your first and last name.
B. Do not talk to people you know online.
C. Do not share any personal information.
D. Share your parents' information.
Answer:
I believe the answer is C.
Explanation: Hope this helps and have a great day! :)
10
5 points
What is the power of a small motor that can do 2500 J of work in 25 seconds?
0.01 Watts
100 Watts
1000 Watts
62500 Watts
Answer:
100 Watts
Explanation:
Energy can be defined as the ability (capacity) to do work.
Given the following data;
Energy = 2500 J
Time = 25 seconds
To find the power of the motor;
Power = energy/time
Substituting into the formula, we have;
Power = 2500/25
Power = 100 Watts