Answer:
64 km/h
Explanation:
a truck of mass 2 500 kg travelling at the speed of 20 ms–1 to the right collide head-on with another car of mass 1 000 kg. If both the truck and the car stop after collision, what is the velocity of the car before the collision?
Answer:
50 m/s opposite direction to the motion of the truck
Explanation:
From the question,
Applying the law of conservation of momentum
mu+m'u' = V(m+m')...….. Equation 1
Where m = mass of the truck, u = initial velocity of the truck, m' = mass of the car, u' = initial velocity of the car, V = Final velocity after collision
Given: m = 2500 kg, u = 20 m/s, m' = 1000 kg, V = 0 m/s (both car stop after collision)
Substitute these values into equation 1
2500(20)+1000(u') = 0(2500+1000)
2500(20)+1000(u') = 0
Solve for u'
u' = -[2500(20)]/1000
u' = -50 m/s
The negative sign shows that the car travels in opposite direction to the truck
Hence the car initial velocity before collision is 50 m/s in opposite direction to the motion of the truck
What type of planets does the asteroid belt orbit?
Answer:
Main Asteroid Belt: The majority of known asteroids orbit within the asteroid belt between Mars and Jupiter, generally with not very elongated orbits. The belt is estimated to contain between 1.1 and 1.9 million asteroids larger than 1 kilometer (0.6 mile) in diameter, and millions of smaller ones.
Explanation:
Hi!Most of these objects, called planetoids or asteroids meaning "star-like" orbit between Mars and Jupiter in a grouping known as the Main Asteroid Belt.
Which of the following statements is true of gravity?
A. Gravity decreases rapidly as the distance between two objects increases, especially when considering distances between objects in space
B. Gravity is affected by the weight of two objects that attract each other and the distance between them.
C. Both A and B are correct.
D. Neither A or B is correct.
help plz .............
Answer: l
Explanatiok
jiki
can someone help me answer the questions 1-6 please ?!
Answer:
1- when carbon dioxide concentrations rise, air temperatures go up, and more water vapor evaporates into the atmosphere—which then amplifies greenhouse heating
2-Human activities emit 60 or more times the amount of carbon dioxide released by volcanoes each year. ... In fact, several individual U.S. states emit more carbon dioxide in a year than all the volcanoes on the planet combined do. On the scale of carbon dioxide emissions, human sources far outweigh volcanoes
3-Human activities such as the burning of oil, coal and gas, as well as deforestation are the primary cause of the increased carbon dioxide concentrations in the atmosphere.
4-rising maximum temperatures.
rising minimum temperatures.
rising sea levels
your choice u can write this too (Increased heat, drought and insect outbreaks, all linked to climate change, have increased wildfires. Declining water supplies, reduced agricultural yields, health impacts in cities due to heat, and flooding and erosion in coastal areas are additional concerns)
5-It leads to a decrease of ozone, which protects the Earth from the Sun's heat. ... It includes greenhouse gases, which trap heat in the Earth's atmosphere again u can write this aswell(Global warming is primarily caused by emissions of too much carbon dioxide (CO2) and other heat-trapping gases into the atmosphere when we burn fossil fuels to generate electricity, drive our cars, and power our lives. These heat-trapping gases spread worldwide and remain in the atmosphere for decades to centuries)
6-CO2 levels are determined by the imbalance between carbon sequestration (burial in sediments, capture by plants), and carbon emissions (rock weathering and volcanic activity). Imbalances in this system created a downward trend in CO2 levels, leading to a glaciation period around 300 million years ago.
Explanation:
what happens inside of a star?
Answer:
In the centre of a star, the temperature and pressure are so high that four protons can fuse to form helium, in a series of steps.
Explanation:
Arrange these source charges in order from least to greatest magnitude.
A. A, B, C, D
B. B, D, C, A
C. C, A, B, D
D. D, B, A, C
Answer:
option c is the right answer
Answer:
D, B, A, C
Explanation:
The more lines, the greater the charge.
What do we mean when we say that momentumis a vector
Answer:
it has both magnitude and direction.
Explanation:
Identify the relationship between kinetic energy and gravitational potential energy for the cyclist at each position
Answer:
follows are the responses to the given question:
Explanation:
The kinetic energy of every object moving. [tex]PK=m \times v^2[/tex] any entity lifted against the strength of gravity stores elastic potential of gravity.
[tex]PE = height \times mass \times g[/tex]
Its total power of an independent device stays constant underneath the Mass conservation on Energy and it is, the kinetic energy plus potential energy is just like a fixed [tex](KE+PE=Standard)[/tex]. So, if KE improves, it is valid that PE declines.
If the PE is now at least then KE has been at the highest. It is also valid that KE is reduced as PE is increased as well as the maximum PE, the minimum KE.
What kind of force does the magnet use move the nail
friction
push
pull
gravity
A train whistle is 580 Hz when
stationary. It is moving away from
you at 18.8 m/s. What frequency
do you hear?
(Speed of sound = 343 m/s)
(Unit = Hz)
HELP PLS!!
Answer:
Did you find the answer for this?
Explanation:
Answer:
550Hz
Explanation:
When does a metal atom stop reacting
Answer:
When a metal element reacts with a non-metal element an ionic compound is formed. An understanding of the way the elements are bonded allows us to explain their typical properties.
Reactions between metals and non-metals include:
sodium + chlorine → sodium chloride
magnesium + oxygen → magnesium oxide
calcium + chlorine → calcium chloride
Explanation:
In all of these reactions, the metal atoms give electrons to the non-metal atoms. The metal atoms become positive ions and the non-metal atoms become negative ions.
A metal atom often stop reacting when it has lost all of its outer electrons.
Metal atoms often have few electrons in their outer shell.
Non-metal atoms does have plenty of electrons in their outer shell.
A Metal atoms lose the electron, or electrons, when in their highest energy level and tend to be positively charged ions.
Non-metal atoms often gain an electron, or electrons, so as to be negatively charged ions.
The loss or gain of valence electrons make ions to work with the octet rule and become more stable.
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What happens to a digital signal sent using electromagnetic waves as it travels farther from its source?
Answer:
Please find the answer in the explanation
Explanation:
What happens to a digital signal sent using electromagnetic waves as it travels farther from its source?
Solution.
To transmit a signal, the analogue signal is first modulated and converted to digital signals.
The digital signals transmitted through electromagnetic waves like radio wave or microwave can experience attenuation over a long distance as they tend to pass through tissues and wall.
The frequency and the intensity of wave continue to decrease as the wave tend to propagate through the wall and tissues.
To correct this, there must be a device to amplify the signal at the strategic points.
After this, the signal will be demodulated back to the analogue signal.
Therefore, attenuation may occur as the signal tend to pass through the tissues and office walls.
Answer:
The signal becomes weaker and more difficult to detect
Explanation:
got it right on my quiz
A sound wave enters a new medium where sound travels faster. How does this affect the frequency and wavelength of the sound?
OA The frequency increases and the wavelength decreases.
OB. The frequency decreases and the wavelength increases.
Ос. . The frequency stays the same and the wavelength increases.
OD. The frequency stays the same and the wavelength decreases.
O E. Neither the frequency nor the wavelength is affected.
When a sound enters a new medium where the sound travels faster, it means the vibration of particles is high, and the wavelength of the waves increases which means the speed of the wave has increased. The frequency on the other hand will remain constant.
The bottom of the hockey stick is called a?
Answer:
Blade Heel.
Explanation:
Brainliest please!!!
Conservation of momentum
Answer:
8.6 m/s
Explanation:
From the question,
applying law of conservation of momentum
Total momentum before collision = Total momentum after collsion
mu+m'u' = mv+m'v'....................... Equation 1
make v' the susbject of the equation
v' = (mu+m'u'-mv)/m'.................. Euqation 2
Where m = mass of the ball, m' = mass of the can, u = initial velocity of the ball, u' = initial velocity of the can, v = Final velocity of the ball, v' = final velocity of the can.
Given: m = 1.2 kg, m' = 0.7 kg, u = 14 m/s , u' = 0 m/s (at rest), v = 9 m/s.
Substitute these values into equation 2
v' = [(1.2×14)+(0.7×0)-(1.2×9)]/0.7
v' = (16.8-10.8)/0.7
v' = 6/0.7
v' = 8.6 m/s
If an engine does 400 J of work in 5 s, how much power was generated?
A.8W
B.8000W
C.800W
D.80w
Answer:
the answer is c
Explanation:
I NEED HELP PLEASE !!!!
Find the impulse that acts on the object during the time interval 10s to 20s
Answer:
I guess it's force hope this answer helps
as velocity _________ kinetic energy ____________ and potential energy _____________
Answer:
Kinetic energy increases and potential energy decreases
Explanation:
Because kinetic energy is proportional to the square of the velocity, when velocity is doubled, kinetic energy is quadrupled. Kinetic energy K=mv^2/2. Kinetic energy is the energy of movement or change. Potential energy is the energy a system has as a result of being able to undergo some change. ... As an object falls its potential energy decreases, while its kinetic energy increases. The decrease in potential energy is exactly equal to the increase in kinetic energy.
The simple activities like walking, jumping and falling involves kinetic energy. Here as the velocity increases kinetic energy increases and the potential energy decreases.
What is kinetic energy?The measure of the work that an object does by virtue of its motion is known as the kinetic energy. It is transformed between the objects and can be transformed into other forms of energy. It is a scalar quantity.
Every moving object and particle have kinetic energy. The kinetic energy of the particle is dependent on the mass and velocity of the particle. If the velocity is doubled, then the kinetic energy is quadrupled.
The equation of kinetic energy is:
Kinetic energy = 1/2 × m × v²
The energy stored by an object due to its position is called the potential energy. It is found to be maximum at a particular height. So it decreases with the increase of velocity.
To know more about Kinetic energy, visit;
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A car travels 52 mph for 6 minutes, 46 mph for 3 minutes, 40 mph for the remaining time during a 30 minute journey. find the total distance travelled
Answer:
21.5 miles
Explanation:
Distance = Speed * time
Distance traveled in first 6 minutes = 52 * [tex]\frac{6}{60}[/tex] = 5.2 miles
Distance traveled in next 3 minutes = 46 *[tex]\frac{3}{60}[/tex] = 2.3 miles
Remaining minutes = 30 - 6 -3 = 21 minutes
Distance traveled in 21 minutes = 40 * [tex]\frac{21}{60}[/tex] = 14 miles
Total distance traveled = 5.2 + 2.3 + 14 = 21.5 miles
Four forces are acting on the block in the diagram. One of the forces is unknown. If the block is in equilibrium, what is the correct unknown force?
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A tuba creates a 4th harmonic of
frequency 116.5 Hz. When the first
valve is pushed, it opens an extra bit
of tubing 0.721 m long. What is the
new frequency of the 4th harmonic?
(Hint Find the original length.)
(Speed of sound = 343 m/s)
(Unit = Hz)
Answer:
93.54 Hz
Explanation:
✓From the question, Number of harmonic frequency is 4
✓ the frequency (f₄ )= 116.5 Hz
✓harmonic frequency can be calculated using below expresion
fₙ = [ (nv)/4L]..........eqn(1)
v = speed of sound= 343 m/s
n = number of given harmonic frequency
L = Length of the rope
Using above expresion ,and substitute the values at (n=4) which is 4th harmonic frequency to find the " initial Lenght of the rope
fₙ = [ (nv)/4L]
f₄ = 4× 343 /4L
f₄ = 343 /L
L= 343 /f₄
But f₄= 116.5 Hz
L= 343/116.5= 2.944m
Hence, initial Lenght of the rope= 2.944m
We can determine the frequency of new length as ( initial Lenght of the rope + tubing Lenght)
= ( 2.944m + 0.721m )
= 3.667m
Hence, new length= 3.667m
To find the new frequency of the 4th harmonic we will use eqn(2)
f₄ = v/l ...............eqn(2)
From equation (2) If we substitute the values we have
f₄ = (343/3.667)
= 93.54 Hz
Hence, the the new frequency of the 4th harmonic is
93.54 Hz
Answer: 103.3?
Explanation:
A dog and a cat sit on a merry-go-round. The dog sits 0.3 m from the center. The cat sits 1.5 m from the center. The whole merry-go round rotates with an angular speed of 5 rad/s. Which animal, if either, is experiencing a higher velocity? Which animal, if either, is experience a higher angular speed?
Answer:
hope that pic helps!! let me know!!
Explanation:
or this expert answers from expert
Wind is:
A) Electricity
B) A type of sound
C) A type of precipitation
D) The movement of air molecules
Answer:
d
Explanation:
ignore this part djnddjkd
all of the following describe the motion of an object except
mass
speed
velocity
acceleration
A car with a mass of 1400 kg moves along the ice with a constant velocity of 18.0 m/s. What is the car’s momentum?
Answer:
M= mv= 1400 x 18= 25200 kg x m/s
A city that is far inland is
typically cooler and drier than a city near the Gulf of Mexico.
Disagree or agree?
Why?
Answer:
In Texas, a city that is far inland is typically cooler and drier than a city near the Gulf of Mexico. Alaska is surrounded by cold water, so the state experiences more hurricanes than most areas of the United States. Ocean currents move cold water from the tropics to the poles where the water warms.
Pls I need help
Boom pah pah
Which statements best describe displacement? Check all that apply.
Displacement is measured along the path an object travels.
Displacement is a measurement that includes direction.
Displacement is the difference between a starting point and an ending point.
Displacement is how far an object travels from starting point to ending point.
Displacement is measured as a straight line between a starting point and an ending point.
Pls help,Will mark brainliest if correct :)
Answer:
the last one, the third one, and the first one.
Answer:
Displacement is a measurement that includes direction, displacement is the difference between a starting point and an ending point, and displacement is measured as a straight line between a starting point and an ending point.
Explanation:
A wind turbine has a total input power of 2 500 kW.
The efficiency of the wind turbine is 20%.
What is the useful output power of the turbine?
Answer:
Output power = 500 KW
Explanation:
Given the following data;
Efficiency = 20%
Input power = 2500 KW
To find the output power;
[tex] Efficiency = \frac {Out-put \; power}{In-put \; power} * 100 [/tex]
Substituting into the equation, we have;
LET Output power = OP
[tex] 20 = \frac {OP}{2500} * 100 [/tex]
Cross-multiplying, we have;
[tex] 20 * 2500 = OP * 100 [/tex]
[tex] 50000 = OP * 100 [/tex]
[tex] OP = \frac {50000}{100} [/tex]
Output power = 500 KW