Answer:
The idea behind space expansion is that after the big bang, the universe started infinitely expanding. It's also called metric expansion. Stephen Hawking's A Brief History of Time goes further into detail on this.
What is the conversation of energy
Answer:
The conservation of energy is a principle where according to which the energy of interacting bodies or particles in a closed system remains constant.
Explanation:
Answer:
a principle stating that energy cannot be created or destroyed, but can be altered from one form to another.
Part B: Explain why the cardboard would be a better item than the jump rope for
modeling the cell wall of a plant cell. (5 points)
The cardboard would be able to act as a better cell wall since it can act more closely to an actual cell wall. A cell wall has layers and covers the plant cells in order to protect it. The cardboard can cover it more with its layers rather than the jump rope.
The cardboard would be a better item than the jump rope because the cardboard would be able to act as a better cell wall since it can act more closely to an actual cell wall. The cardboard can cover it more with its layers rather than the jump rope.
What is a plant cell?A plant cell is a eukaryotic cell that contains a true nucleus and certain organelles to perform specific functions. However, some of the organelles present in plant cells are different from other eukaryotic cells.
What is the composition of a plant cell wall?The cell wall of a plant is made up of cellulose. Cellulose is a long, linear polymer of several glucose molecules.
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In a position vs time graph if the line is curved then the motion of the object may be
described as
Answer:
tge motion of the object is not constant or uniform
Answer: It may be speeding up or slowing down.
Explanation:
The 59 converted into binary is _____.
How do we convert number to binary?
Answer:
111011
Explanation:
59/2 = 29, remainder is 1
29/2 = 14, remainder is 1
14/2 = 7, remainder is 0
7/2 = 3, remainder is 1
3/2 = 1, remainder is 1
1/2 = 0, remainder is 1
The graph below shows the percentage of unstable nuclei remaining of a radioactive isotope.
Initially, there was 44g of the radioactive substance. How much of the substance is thereafter 60 minutes?
i have no clue, sorry. jus tryna get points
The lamps in circuit drawn below are all identical, Each of the cells have a potential difference of 1.5 volts What is the potential difference across the 3 cells that are joined in series
Answer:
4.5V
Explanation:
In a arrangement of cells, the cells could be joined end to end(series) or to a common junction (parallel).
When cells are joined in series, the total emf of the cell is the sum of the individual emf of all the cells.
Hence;
Total emf = 1.5V + 1.5V + 1.5 V = 4.5 Volts
Two persons are applying forces on two opposite sides of a moving cart.
The cart still moves with the same speed in the same direction. What
do you infer about the magnitudes and direction of the forces applied.
Answer:
the force is very strong between
Jerome has a tow truck, and he is in charge of moving several vehicles for the city. He wants to explain to his niece how towing vehicles relates to Newton's second law. Which statement should he use?
Answer:
Force = mass x acceleration
Explanation:
According to the Newton's second law, the net force acting on the object is proportional to the rate of change of momentum of the body.
So, Force is given by
F = m a
where, F is the force, m is the mass and a is the acceleration.
when the mass is more, the acceleration is less as the force applied by the truck is same.
The element radon is at the opposite end of the range, with the lowest specific heat of all naturally occurring elements. Radon's specific heat is 94 J/kg°C. If the
temperature of a 0.34 kg sample of radon is to be raised by 25°C, how much energy will have to be added to the radon?
Explanation:
Q = mc∆T
= (0.34 kg)(94 J/kg-°C)(25°C)
= 799 J
(5 pts) If the object can reach a speed of 2m/s, what
is its kinetic energy? (If you don't have a scaler,
estimate the mass of the object in kg)
KE= | mv2
Answer:
[tex] = \frac{1}{2} m {v}^{2} \\ = \frac{1}{2} \times m\times {2}^{2} \\ = 2m \: joules[/tex]
A car traveling at a speed of 30 m/s encounters an emergency and comes to a complete
stop (vf = 0 m/s). How much time will it take for the car to stop if its acceleration is -4 m/s2?
Answer:
Explanation:
Use the one-dimensional equation
[tex]v_f=v_0+at[/tex] which says that the final velocity of an object is equal to the object's initial velocity plus its acceleration times time. We are looking for time. That means the equation looks like this:
0 = 30 + (-4)t and
-30 = -4t so
t = 7.5 sec
The time taken for the car to stop if its acceleration is -4.0 m/s² is 7.5 seconds.
What is Equation of motion?
According to equation of motion, three motion equations commonly referred to as the rules of constant acceleration, exist for a uniform acceleration.
To derive the components such as displacement(s), velocity(initial =u and final = v), time(t), and acceleration(a), these equations are utilized.
The equations can be,
v=u + at or, v = u-atv²=u²+2as s= ut+1/2 at²As we have to Calculate the time :
The formula for the motion equation is
v = u - at
v - final velocity
u - initial velocity
a - acceleration
t - time
Here, v = 0 ,
u = 30 m/s
a = -4 m/s²
So substituting in, v = u - at
⇒0 = 30 - 4t
⇒4t = 30
⇒t = 30/4
t = 7.5 seconds
Therefore, the required time calculated is 7.5 seconds.
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Help quick physics area question
Answer: The area of brick in contact with the floor is 1539 [tex]cm^{3}[/tex].
Explanation:
Given: Length = 19 cm
Width = 9 cm
Height = 9 cm
As the brick is rectangular in shape. Hence, its area will be calculated as follows.
[tex]Area = length \times width \times height[/tex]
Substitute the values into above formula as follows.
[tex]Area = length \times width \times height\\= 19 cm \times 9 cm \times 9 cm\\= 1539 cm^{3}[/tex]
Thus, we can conclude that area of brick in contact with the floor is 1539 [tex]cm^{3}[/tex].
summary on scaler quantity
Answer:
A quantity which does not depend on direction is called a scalar quantity. Vector quantities have two characteristics, a magnitude and a direction. Scalar quantities have only a magnitude. When comparing two vector quantities of the same type, you have to compare both the magnitude and the direction.
I rarely share my notes. But these are my last year notes, so I can share with you. Click on the photo to view the answer.
Which diagram correctly represents the electric field lines between two small electrically charged spheres?
Answer:
hehe
Explanation:
The direction of electric field in the two small charged sphere can be outward if both are positive and inward if both are negative.
Direction of electric field in a charged sphereThe direction of electric field in a charged sphere can be inward or outward. The electric field will point inwards for a negatively charged sphere and outward for a positively charged sphere.
The type of charge at the center of the sphere will determine the direction of the electric field.
Thus, the direction of electric field in the two small charged sphere can be outward if both are positive and inward if both are negative.
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Amy put some salt in a weighing dish. Then she put the weighing dish on a sensitive balance to measure the mass of the salt. She removed the weighing dish from the balance and put it in several similar balances. She recorded the mass each time. Mass 1 Mass 2 Mass 3 Mass 4 Masse 5 5.608 g 5.607 g 5.608 g 5.608 g 5.609 g Amy forgot to subtract the mass of the empty weighing dish from her measurements, and she reported the mass of the salt as 5.608 grams. Amy's measurement of the salt's mass accurate because . Amy's measurement of the salt's mass precise because .
Answer:
Explanation:
i. Accuracy in measurement is a term that is used to describe the closeness of a measured value to its actual value. It relates the actual value to the measured values.
Therefore in the given question, Amy's measurement of the salt's mass is accurate because her final value is close to all the measured values.
ii. Precision in measurement is a term that is used to describe the closeness of different measured values to each other. It relates the keenness in the measured values.
Thus, Amy's measurements of the salt's mass is precise because the values of the masses are close to one another.
An object accelerating at 16 m/s/s doubles its mass and triples its net force acting on it. What will the new acceleration be? (Just number no units)
Answer:
24 m/s²
Explanation:
The given parameters are;
The initial acceleration of the object, a = 16 m/s²
Let 'm' represent the initial mass of the object
The initial force acting on the object, F = m × a
∴ F = 16 × m = 16·m
When the mass is doubled, we have;
The new mass of the object, m₂ = 2 × m = 2·m
When the net force acting on the object triples, we have;
The new net force acting on the object, F₂ = 3 × F = 3 × 16·m = 48·m
From F = m × a, we have;
a = F/m
∴ The new acceleration of the object, a₂ = F₂/m₂
From which, by plugging in the values, we have;
a₂ = 48·m/(2·m) = 24
The new acceleration of the object, a₂ = 24 m/s².
what is netwon first law of motion
Answer:
Newton’s first law of motion states that there must be a cause—which is a net external force—for there to be any change in velocity, either a change in magnitude or direction. An object sliding across a table or floor slows down due to the net force of friction acting on the object.
Explanation:
how does gravity maintain the the atmospheric layer around earth ?
Please explain in a very easy way
will mark as BRAINLIEST
Answer:
Our atmosphere is a mixture of gases that surround Earth. It is kept in place by the pull of Earth's gravity. If Earth was a much smaller planet, like Mercury or Pluto, its gravity would be to weak to hold a large atmosphere
Explanation:
Austin kicks a soccer ball with an initial velocity of 18.0 m/s at an angle of 35.0°. What are the horizontal and vertical components of the initial velocity?
Answer:
Vx = 14.74 m/s.
Vy = 10.32 m/s
Explanation:
Applying,
Vx = Vcos∅................ Equation 1
Where Vx = Horizontal component of the initial velocity, V = Intial Velocity, ∅ = Angle to the horizontal
From the question,
GIven: V = 18.0 m/s, ∅ = 35.0°
Substitute into equation 1
Vx = 18(cos35.0°)
Vx = 18(0.819)
Vx = 14.74 m/s.
Also for vertical component,
Vy = Vsin∅................... Equation 2
Where Vy = vertical component of the initial velocity
Substituting the values above into equation 2
Therefore,
Vy = 18(sin35°)
Vy = 10.32 m/s
What is the net force on the object represented by the FBD below?
Explanation:
hope you understood fella
I WILL MARK U BRAINLIEST IF YOU ANSWER
BLUEBLACK COLOR IS FORMED WHEN STARCH AND IODINE IS MIXED .
Porque deja de funcionar una estufa electrica cuando la electricidad es excesiva??
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a relative density bottle has a mass of 29.2 g when empty its mass is 116.2 g when it is full of liquid or diesel and when full of water it's mass is 129.2 g calculate the relative density of diesel
Answer:
0.87
Explanation:
Given :
Mass of bottle = 29.2 g
Mass when filled with diesel = 116.2 g
Mass when filled with water = 129.2 g
The mass of water = (Mass when filled with water - mass of bottle)
Mass of water = 129.2 - 29.2 = 100 g
Mass of diesel = (Mass when filled with diesel - mass of bottle)
Mass of diesel = 116.2 - 29.2 = 87
Relative density of diesel = mass of diesel / mass of equal volume of water
Relative density = 87 / 100 = 0.87
Your little sister (mass 25 kg) is sitting in her little red wagon (mass 8.5 kg) at rest. You begin pulling her forward, accelerating her with a constant force for 2.35 s to a speed of 1.8 m/s. Calculate the Impulse you imparted to the
wagon and its passenger
As the wagon is been pulled forward with a constant force, the impulse Impulse imparted to the wagon and the little girl is 60.3kg.m/s
Given the data in the question;
Mass of little sister; [tex]m_s =25kg[/tex]Mass of wagon; [tex]m_w = 8.5kg[/tex] time; [tex]t = 2.35s[/tex]Since the wagon was originally at rest, Initial velocity; [tex]u = 0m/s[/tex]Final velocity; [tex]v = 1.8m/s[/tex]Impulse is the force applied for certain amount of time which results in change in momentum.
[tex]I = M( v-u )[/tex]
To determine the impulse you imparted to the wagon and its passenger.
Total mass[tex]M = ( m_s + m_w) = ( 25kg + 8.5kg ) = 33.5kg[/tex]
So, we substitute our given values into the equation
[tex]I = 33.5kg(\ 1.8m/s\ -\ 0m/s\ )\\\\I = 33.5kg \ *\ 1.8m/s \\\\I = 60.3kg.m/s[/tex]
Therefore, as the wagon is been pulled forward with a constant force, the impulse Impulse imparted to the wagon and the little girl is 60.3kg.m/s
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A professional driver raced 400 meters in 8.56 seconds. If the driver started at rest and had a constant acceleration throughout the race, What was the acceleration of the car?
Answer:
10.92 m/s²
Explanation:
Applying,
s = ut+at²/2.................... Equation 1
Where s = distance. u = initial velocity, t = time, a = acceleration.
From the question,
Given: s = 400 meters, t = 8.56 seconds, u = 0 meters/seconds (Starts from rest)
Substitute these values into equation 1
400 = 0(8.56)+a(8.56²)/2
400 = 73.2736a/2
73.2736a = 800
a = 800/73.2736
a = 10.92 m/s²
If you lift a 80 N book 50 cm off the floor, how much work did you do?
1. 0
2. 4000 J
3. 40 J
4. 1.6 J
A man pushes a couch a distance of 0.75 m. If 450 J of work is done, what is the magnitude of the force applied?
1. 16.9 J
2. 45
3. 1350 J
4. 2700 J
Aslaam 3lekm m3akm yaseen my 8nat alninkm
an unforgettable day
Physical characteristics can be transmitted from generation, from parents to offspring. The passage of genetic Instructions from one generation to anther is known as which of the following?
A. Heredity
B. Chromosomes
C. DNA
D. Genes
Answer:
A. HeredityExplanation:
Heredity is defined as the passage of genetic instructions from one generation to the next.
Which is used to name an ionic compound?
Answer:
An ionic compound is named first by its cation and then by its anion. The cation has the same name as its element.
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Answer:
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