Answer:
i think that the answer might be be C. one day. because it last about 4 to 6 hours
Objectives
Pecina
y
01:Posttest 01:Motion Along a Straight Line
eration
1. An elevator moving down passes its neighbor, an elevator moving up. Their speed relative to one another is 8 m/s. What is the velocity of each
elevator relative to someone standing on the first floor? Assume that the elevators are traveling at the same speed, and that the upward direction is
positive.
tant Acceleration
O Both elevators are moving at 8 m/s.
y Falling Objects
O One elevator is moving at 4 m/s; the other elevator is moving at -4 m/s.
O Both elevators are moving at 4 m/s.
tive Velocity
O One elevator is moving at 8 m/s; the other elevator is moving at -8 m/s.
Posttest
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ton's Laws of Motion
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Answer:
B
Explanation: Given that an elevator moving down passes its neighbor, an elevator moving up. Their speed relative to one another is 8 m/s. What is the velocity of each elevator relative to someone standing on the first floor? Assume that the elevators are traveling at the same speed, and that the upward direction is positive.
O Both elevators are moving at 8 m/s.
y Falling Objects
O One elevator is moving at 4 m/s; the other elevator is moving at -4 m/s.
O Both elevators are moving at 4 m/s.
tive Velocity
O One elevator is moving at 8 m/s; the other elevator is moving at -8 m/s.
Solution.
Since the upward direction is positive, the downward direction will be negative.
For their speed relative to one another to be 8 m/s, the individual velocity will be:
4 - ( - 4 ) = 8
Therefore, the correct answer is:
One elevator is moving at 4 m/s; the other elevator is moving at -4 m/s
Which is option B
Because the negative sign multiply by negative sign will give positive.
That is,
4 + 4 = 8
Define wheel and axle 4 example of wheel and axle
Answer:
A system of two co-axial cylindersof different diameters which rotate together is called wheel and axle example; the door knob , knob of the tap ,screw driver,water tap
What is the smallest organism?
do fish get thirsty????
How do y’all solve this
Answer:
you Subtract
Explanation:
A = 6
B = 6
C = 0
D = 5
9-3= 6
13-7=6
11-11=0
6-1=5
Simple hope it helps
PLEASE PLEASE PLEASE HELP
Answer:
Rain came along with lower temps
Explanation:
There was no rain on the warmer days
There were more clouds as the week went on
and the temp decreased during the week so rain came with lower temps is the only one that can be correct
write short note : power
Answer:
In physics, power is the amount of energy transferred or converted per unit time. In the International System of Units, the unit of power is the watt, equal to one joule per second. In older works, power is sometimes called activity. Power is a scalar quantity.
SI unit: watt (W)
Derivations from other quantities: P = E/t; P = F·v; P = V·I; P = τ·ω
In SI base units: kg⋅m2⋅s−3
Answer:
As a student, what are your insights about this lesson? Write an essay on your
toughts about the types of drugs/subtance of abuse, discussing its description and
effects
Tin is more active than lead.
O A. True O B. False
Answer:
It would be false
Explanation:
Lead is more reactive if thats what you mean
As shown, the two charges are 3 cm apart. What will happen to this force if the distance between the charges is doubled? Use proportional reasoning to find the answer and then check by moving the charges.
Answer:
if the distance between the two charges is doubled, the attraction or repulsion becomes weaker, decreasing to one-fourth of the original value. If the charges come 10 times closer, the size of the force increases by a factor of 100. The size of the force is proportional to the value of each charge.
When charges are 3 centimeters apart if the distance between the charges is doubled, the force between them is reduced by a factor of four.
What is Coulomb's Law?Coulomb's law can be stated as the product of the charges and the square of the distance between them determine the force of attraction or repulsion acting in a straight line between two electric charges.
F= k Q₁Q₂/r²
Where F is the force between two charges
As given in the problem, the two charges are 3 centimeters apart, then we have to find out what will happen to this force if the distance between the charges is doubled.
As per Coulomb's law, the force is inversely proportional to the square of the distance between charges.
Thus, the force between them is reduced by a factor of four.
Learn more about Coulomb's law from here, refer to the link;
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Two resistors of resistance 19 each are connected in series. A potential difference of 10 V is then
applied across the resistors. What is the resulting current through the resistors?
Two resistors of resistance 19 ohm each are connected in series.
In series combination, equivalent resistance = 19+19 = 38 ohm
Potential difference = 10 V
V/I = R
I ( current ) = V/R = 10 V / 38 ohm = 0.26 ampere
what will happen if you reverse the connction of the coil on a electro magnet I will give Brainliest
Answer:
Explanation: The poles of an electromagnet can even be reversed by reversing the flow of electricity. If a wire carrying an electric current is formed into a series of loops, the magnetic field can be concentrated within the loops. All of their little magnetic fields add together, creating a stronger magnetic field.
Which of the following statements describes the law of inertia?
O A. The force of friction on an object is proportional to the normal
force.
O B. Objects remain in the same state of motion unless a force acts on
them
O c. For every action force there is an equal and opposite reaction
force.
D. Net force is equal to mass times acceleration
Answer:
B. objects remain in the same state of motion unless a force acts on them
Explanation:
Sana nakatulong
Answer: B) objects remain in the same state of motion unless a force acts on them
Explanation:
Newton's Second Law states that The resultant force acting on an object is proportional to the rate of change of momentum.
The net force on a body = mass of object × acceleration of the object
The first option "Objects remain in the same state of motion unless a force acts on them" is an implication of the first law of motion .
The second option "For every action force there is an equal and opposite reaction force" is an implication of the third law of motion.
The last option from the given list "Net force is equal to mass times acceleration" is an implication of the second law of motion.
An aircraft lands at a speed of 180km/h
and stops in 2 minutes. The mass of the
aeroplane is 10,000kg. Find the length
of the distance of runway.
a. 18 km
b. 6 km
c. 4 km
d. 3 km
Which wave type could move in the empty space between the Sun and the Earth
Answer:
Electromagnetic waves
A motorcyclist is moving 24.5 m/s
away from a stationary siren, and
hears an 894 Hz sound. What is
the frequency of the siren when the
cyclist is stationary?
(Hint: 894 Hz is the Doppler-shifted
frequency)
(Speed of sound = 343 m/s)
(Unit = Hz)
w
Answer:962 hz
Explanation: got it right on acellus
The frequency of the siren when the cyclist is stationary will be 963 Hz.
What is frequency ?The frequency of a wave is the number of cycles per second.
FRom the doppler effect,
f =f'[ (V+Vs/V-Vo) ]
Here, doppler shifted frequency f' = 894 Hz, Source is stationary, Vs =0. Velocity of observer Vo = 24.5m/s and velocity of sound wave V = 343m/s
Substitute the value into the expression , we get
f = 894 x [(343/343 - 24.5)}
f = 963 Hz
Thus, the frequency of the siren when the cyclist is stationary is 963 Hz.
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An automatic clothing drier spins at 51.6 rev/min. If the radius of the drier drum is 30.5cm, how fast (in m/s) is the drier drum moving
Answer:
1.648 m/s
Explanation:
1 revolution equals 2pi radians.
Calculate the angular velocity by taking 2pi x v, then divide by 60 seconds.
To convert this to m/s, simply take this answer and multiply it by 0.305m (a.k.a. the radius of the circle).
1 revolution is equals 2pi radians. The drier will move 1.648 m/s.
Thus, v = 51.6 rev/ min.
1 revolution = 2 pi radians.
Angular velocity = 2 pi (v)/ 60
= 2 *3.14 * 51.6/ 60
= 5.404 rad/ seconds.
r = 30.5 cm = 0.305 m
v= ( 5.40) ( 0.305)
v= 1.648 m/s.
Thus, 1 revolution is equals 2pi radians. The drier will move 1.648 m/s.
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pedro uses a bar magnet to pick up a nail. He then
touches the tip of the nail to some staples.
Why do some of the staples stick to the nail?
The nail and the bar magnet are now both permanent
magnets.
The nail has become a temporary magnet, while the
bar magnet remains a permanent magnet.
O The nail has become a permanent magnet, while the
bar magnet has become a temporary magnet.
The nail and the bar magnet are now both temporary
magnets.
Answer:
B
Explanation:
bababooey
B) The nail has become a temporary magnet, while the bar magnet remains a permanent magnet.
What is single touch method of making a magnet?Single touch method is one of various ways of making a magnetic material like soft iron into a magnet.
In this method one end of the magnet (say north pole) is placed at one end of the iron piece and then rubbed over the bar from end to other, then lifted and brought back to first end.
According to the question,
The nail will stick to the bar magnet because it will become magnetized. The presence of the nearby north pole rearranges the magnetic domains inside the steel so that their south poles all point toward the north pole of the permanent magnet.
As a result, the other end of the nail becomes a north pole.
If you bring a bar magnet close to the first iron nail, you can lift the the first iron nail with the magnet and also it will attract and lift the second iron nail.
To attract or even lift the third magnet will depend on the distance.
Hence , the nail has become a temporary magnet, while the bar magnet remains a permanent magnet.
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if up is up and down is down isn't downside up , upside down
Answer:
No they arent because they are opposite to each other.
An object with a mass of 14 kg accelerates at a rate of 6.2 m/s^2. Calculate
the force required to produce this acceleration.
Answer:
86.8N is the correct answer
g One arm of a Michelson interferometer has a section of length 2.1 cm where the air can be evacuated. The dielectric constant of air is 1.00059. Find the number of fringes which will shift in the interference pattern of the interferometer when the air is evacuated for an interferometer illuminated with light of 663 nm wavelength.
Answer:
The answer is "12388.17"
Explanation:
[tex]l = 2.1 cm = 2.1 \times 10^{-2}\ m\\\\k = 1.00059\\\\\eta = \sqrt{k}= \sqrt{1.00059}\\\\\lambda = 663 nm = 663 \times 10^{-9}\ m[/tex]
Users now know that perhaps the number of fingers the shift is provided when a path difference [tex]\Delta d[/tex] are inserts between both the two arms
[tex]N = \frac{\Delta d}{\lambda}[/tex]
The optical pull-up in the arm is initially given by
[tex]d = 2\eta l[/tex]
Its new length of the different sense as the reflection coefficient adjustments between [tex]\eta[/tex] (air) and 1 so if we evacuate air from of the arm (vacuum).
The new length of a path is therefore
[tex]d'' = 2l[/tex]
Therefore, the different path
[tex]\Delta d=d-d''=2l(\eta -1)[/tex]
So, The fringe shifts number are
[tex]N= \frac{2l(\eta -1)}{\lambda}[/tex]
[tex]= \frac{2 \times 2.1 \times 10^{-2} (\sqrt{1.00059}-1)}{663 \times 10^{-9}}\\\\=12388.17[/tex]
Explain the importance of resistors in a circuit. Cite some instances to prove this example.
Which device helps safely transmit electricity from the power plant to your
home?
Answer:
A. Transformer
Explanation:
it’s correct
On a distance-time graph, what is shown when the curve is flat going from left to the right?
A. a negative speed
B. no speed
C. a positive speed
D. It does not mean anything.
Answer:
The aswers is C
Explanation:
A cardboard box has four forces acting upon it, as shown in the diagram below. What is the magnitude of the unknown force, Funknownacting on the box if the box is accelerating at 2.0 m/s 2 to the right?
(Answer choices)
A. 5N
B.6N
C.10 N
D. 11N
1. A temperature of 162 °F is equivalent to what temperature in kelvins?
(a) 373 K
(b) 288 K
(C) 345 K
(d) 201 K (e) 308 K
345k
Because the formula for our Fahrenheit is Kevin = 5 * (°Fahrenheit + 459.67)
9.
Potassium loses electrons when it reacts with oxygen. Which statement is true of potassium in this reaction? A. It reduces. B. It undergoes synthesis. C. It undergoes redox. D. It oxidizes.
Answer: d
Explanation:
Who knows how to do this?
Answer:
1) F = 8.789 10² N, 2) F = 1.5 10⁴ N
Explanation:
We can solve this exercise using Coulomb's law
F =[tex]k \frac{q_1q_2}{r^2}[/tex]
Knowing that charges of the same sign repel
let's apply this equation to our case
1) the charges are q = - 0.0025 C and the distance between them r = 8 m
we calculate
F = 9 10⁹ 0.0025 0.0025 /8²
F = 8.789 10² N
as the two charges are of the same sign the force is repulsive
2) q₁ = -0.004C and q₂ = -0.003 C with a distance of r = 3.0 m
we calculate
F = 9 10⁹ 0.004 0.003 / 3²
F = 1.5 10⁴ N
Yellow light has a frequency of 5.21 x 10^15 Hz. What is the wavelength of yellow light?
Answer: The yellow light with a frequency equal to 5.21 x 1014 Hz will have a wavelength of E) 576 nm
If moving charges create magnetic fields and all materials are made up of atoms that have moving charges, why are most things NOT magnetic?
Magnetism is the result of the "spin" of the electron and most of these cancel each other out in larger bodies thus most things not being magnetic.
According to Newton's law of cooling, the rate at which an object's temperature changes is directly proportional to the difference in temperature between the object and the surrounding medium. If T(t) represents the temperature of the object (CC) at time t (in hours), and T5 represents the constant temperature of the surrounding medium, then the differential equation best describing the rate of change in the temperature of the object is:
Answer:
dT(t)/dt = k[T5 - T(t)]
Explanation:
Since T(t) represents the temperature of the object and T5 represents the temperature of the surroundings, according to Newton's law of cooling, the rate at which an object's temperature changes is directly proportional to the difference in temperature between the object and the surrounding medium, that is dT(t)/dt ∝ T5 - T(t)
Introducing the constant of proportionality
dT(t)/dt = k[T5 - T(t)]
which is the desired differential equation
Answer:
dT/dt = k[T5 - T]
Explanation:
DT/dt represents rate of change in temperature for Celsius degrees per hour. Its proportional to the difference in temperature between the object and the Surrounding medium. This means either dT/Dt =k (T-TS) or dT/dt=k(TS-T) with k being some positive constant of proportionality which depends on the object.
We can see that dT/dt = k(T-T5) has temperature increasing when the temperature of the object T is greater than the surrounding medium (T5).
The equation dT/dt=k(T5-T) has the temperature increasing when the object (T) is less than the temperature of the surrounding medium. Therefore the differential equation best describing the rate of change in temperature of the object is dT/dt=k(T5-T) for some positive constant of proportionality k.