In which situation is maximum work considered to be done by a force?
A. The angle between the force and displacement is 180°.
B. The angle between the force and displacement is 90°.
C. The angle between the force and displacement is 60°.
D. The angle between the force and displacement is 45°.
E. The angle between the force and displacement is 0°.
Answer:
d
Explanation:
I really don't know how to explain
What do we mean when we say that momentumis a vector
Answer:
it has both magnitude and direction.
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
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
a way of transferring heat that occurs when the heat source and the heat sink are connected through matter
A. conduction
B. radiation
C. convection
D. combustion
Answer:
The answer is A conduction.
Explanation:
Answer:
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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
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:
Suppose your friend investigated the color of pea pods and concluded that green pods (G) were dominant over yellow pods (g).
Answer:
Terms in this set (25) Mendel crossed true-breeding plants having yellow peas with plants having green peas. The resulting plant had all yellow peas. An F1 cross resulted in 3/4ths of the plants having yellow peas and 1/4th of the plants having green peas.
Explanation:
Explain what must be true of component waves for reinforcement or interference to occur.
The answer is the component of waves must have same frequency and phase.
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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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.
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.
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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.
You swing your golf club such that it hits a ball with a force of 15 newtons. It makes contact with the ball for a distance of 0.01 m. What is the work on the ball?
Answer:
W = 0.15 J
Explanation:
Given that,
The force acting on the ball, F = 15 N
It makes contact with the ball for a distance of 0.01 m
We need to find the work done on the ball. The work done can be calculated as :
W = Fd
So,
W = (15 × 0.01) J
W = 0.15 J
So, the work done is 0.15 J.
What is the mass of an apple with a potential energy of 8 Joules that is on a shelf that is 4 meters high?
A; 32kg
B; 15Kg
C;4kg
D:2kg
The earliest form of soccer occurred in 1697b.c. by the ancient
A. Egyptian
B. Greeks
C. Chinese
D. Japanese
I’ll give brainly
Answer:
C. Chinese
Explanation:
The oldest recorded soccer-like game is the Chinese game of tsu-chu, allegedly invented by the emperor Huang-Ti in 1697 b.c. Records from Huang-Ti's time describe a game played with a leather ball stuffed with animal hair and cork. Two teams vied to kick it through goal posts.
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.
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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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.
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.
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:
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
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
This is an example of:
A model rocket is launched and is descending.
Question 1 options:
A. potential energy
B. kinetic energy
C. both
Answer:
C. both
Explanation:
kinetic energy bcs it's moving and gravitational potential energy for it's descend.
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.
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
The crane pull up the mass with 1150 N. Find the acceleration the
mass.m = 100kg
Kren tersebut menarik naik jisim itu dengan 1150 N. Cari daya
paduan pada jisim itu
[use gravitational acceleration, g = 9.81 m s?]
Answer:
-1.69 m/s²
Explanation:
We are told the crane pulls up the mass with a force of 1150 N.
This means it is in an opposite direction to gravity and thus acceleration(a) is negative.
Now, the gravity is acting downwards, thus, total force is;
F = mg - ma
1150 = 100(9.81 - a)
Divide both sides by 100 to get;
11.5 = 9.81 - a
a = 9.81 - 11.5
a = -1.69 m/s²
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
What kind of force does the magnet use move the nail
friction
push
pull
gravity
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: