Explicación:
La velocidad es el cambio de distancia con respecto al tiempo.
Velocidad = Δd / Δt
Δd es entonces un cambio de distancia
Δt es el cambio en el tiempo
Δd = d2 - d1
Δd = 100 cm - 10 cm
Δd = 90 cm
Convertir a metros
100 cm = 1 m
90cm = x
x = 90/100
x = 0,9 m
Por lo tanto, 90 cm = 0,9 m
Δt = t2 - t1
Δt = 12 s - 4 s
Δt = 8 s
Sustituye el valor obtenido en la fórmula de velocidad:
Velocidad = 0.9 / 8
Velocidad = 0,1125 m / s
Por lo tanto, su velocidad es de 0,1125 m / s.
A sprinter reaches a velocity of 2 m/s in just 1 second. At a constant rate of acceleration, how long does it take for her to double this velocity? What is her acceleration during this time period? Show you work and explain your answer.
Answer:
See the answer below
Explanation:
Acceleration is the ratio of velocity and time. Hence;
Acceleration of the sprinter = 2/1 = 2 m/s2.
When the acceleration is constant and the velocity is double:
acceleration = velocity/time
2 = 4/time,
time = 4/2 = 2 s
Hence, the time it will take for the velocity to double with constant acceleration is 2 s. The sprinter's acceleration during this period would be 2 m/s2.
Acceleration is the change in velocity with time. Hence, the time taken to double velocity is 2 seconds and the constant value of acceleration is 2m/s²
Acceleration is the change in velocity with time ;
Acceleration = (△velocity) ÷ time Velocity = 2m/s ; time = 1 secondAcceleration = (2 ÷ 1) = 2m/s²
Double the value of velocity = 2(2m/s) = 4m/s
At constant acceleration ; Acceleration = 2m/s²
Inputting the Values into the equation :
2 = 4 / time
(2 × time) = 4
Time = 4/2
Time = 2 seconds
Therefore, the time taken to double the velocity is 2 seconds
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Give three reasons why it’s important to give children opportunities to pretend play or have make-believe situations
Answer:
The first reason for children to have pretend play is that it allows the child to learn how to interact socially. The child is able to take turns, share responsibility, develop how people feel and react the situation. Another reason is that it helps the child develop their critical thinking skills. They may have to creatively solve a problem, or think what they may need in real life for the pretend play. It increases the child's ability to think through those types of situations. The final reason it is important for a child to have pretend play is that it helps develop their language skills. If the child is imitating a dad, mom, teacher, etc. they will attempt to use the same language that person uses. This helps the child connect new language abilities and skills.
Explanation:
Answer:
The top 3 reasons for encouraging children to pretend play and make-believe include:
1. To encourage imagination and creativity.
2. To support social and emotional development.
3. To improve language and communication skills.
what will most likely happen if a sound wave moves from the air through a solid
a. it will increase wavelength
b. it will decrease in speed
c. it will increase in speed
d. it will decrease in wavelength
Answer:
C. it will increase in speed
Explanation:
brainliest please? :))
If objects in free fall near the surface of Earth accelerate downward at 9.81 meters per second, why does a feather not accelerate at this rate when dropped near the surface of Earth? A. The feather's mass is too small. B. The air spaces in the feather interfere with gravity. C. Air friction acts on the feather. D. The shape of the feather propels it through the air.
Answer:
the answer of this question is B
The reason why the feather does not accelerate at this rate when dropped near the surface of Earth is because of Air friction acts on the feather.
The free-falling of an object is said to have an acceleration of 9.8 m/s/s, downward (on Earth).
The Gravity or its acceleration due to it is regarded as 9.81 meters per second square, on the earth surface, because of the size of Earth and the distance we are on its surface from its center.
In space, gravity are said to be constant.
Conclusively, due to air resistance, acceleration throughout a fall gets less than gravity because it affects the movement of the falling object by slowing it down.
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A person weighing 645 N climbs up a ladder to a height of 4.55 m. What is the
increase in gravitational potential energy?
Answer:
P.E = 2934.75
Explanation:
Potential energy can be defined as an energy possessed by an object or body due to its position.
Mathematically, potential energy is given by the formula;
[tex] P.E = mgh[/tex]
Where, P.E represents potential energy measured in Joules.
m represents the mass of an object.
g represents acceleration due to gravity measured in meters per seconds square.
h represents the height measured in meters.
Given the following data;
Weight =645
Height = 4.55
[tex] P.E = mgh[/tex]
But we know that weight = mg = 645N
Substituting into the equation, we have;
[tex] P.E = 645 * 4.55 [/tex]
[tex] P.E = 2934.75 J[/tex]
Potential energy, P.E = 2934.75 Joules.
A ball is thrown up into the air. When it falls half-way back, what kind of energy does it have?
Answer:
it's gravitational potential energy would have converted to kinetic energy half way back when it's falls
Please Help!
A girl preformed 50 j of work lifting a heavy box it took her 5 seconds to life the box. What was her power?
A. 45 W
B. 50 W
C. 10 W
D. 250 W
Explanation:
Power is change in energy over time.
P = (50 J) / (5 s)
P = 10 W
Answer: C
Explanation:
For this problem, we must divide.
50 ÷ 5 = 10
The answer to the question is 10
An object has an acceleration of 18.2 m/s/s. If the net force experienced by the object is
decreased by a factor of 3.9, then the new acceleration would be ___m/s/s. Enter a numerical
answer.
Answer:
46.2m/s²
Explanation:
Given parameters:
Acceleration = 18.2m/s²
Original force = F
Decrease factor = 3.9
Unknown:
New acceleration = ?
Solution:
Let the original force = F
new force = [tex]\frac{F}{0.39}[/tex]
Original acceleration = 18.2m/s²
new acceleration = ?
According to newton's second law of motion;
Force = mass x acceleration
So,
mass = [tex]\frac{Force}{Acceleration}[/tex]
So; initial mass = final mass
[tex]\frac{F }{18.2}[/tex] = [tex]\frac{\frac{F}{0.39} }{acceleration}[/tex]
[tex]\frac{F}{0.39}[/tex] x 18.2 = F x acceleration
Acceleration = 46.2m/s²
Where are nonmetals located in the periodic table?
along the bottom
along the upper right side
along the upper left side
in the middle
Answer:
along the upper right side
Explanation:
cause metals are on upper left side
What is the process of erosion?
Answer:
Erosion is the geological process in which earthen materials are worn away and transported by natural forces such as wind or water.
Explanation:
Destructive waves erode through four main processes; Hydraulic Action, Compression, Abrasion and Attrition.
Answer:
Below! ;)
Explanation:
Lots of people have the idea that erosion is where something is eroded away, and EVEN I thought that once, but erosion is the process in which parts of land are moved to a different province. Erosion can sometimes also bring in invacious species.
Hope this helps!
Have a nice day!
If you find my answer helpful
Pls consider marking my answer as Brainliest! It would mean a lot!
1. A ball is dropped from the top of a cliff that is 38 meters tall. Calculate
the ball's impact velocity.
20 points
O +744.8
+27.29
+372.4
+19.30
Answer:
+27.29
Explanation:
To solve this problem we must use the following equation of kinematics.
[tex]v_{f}^{2} =v_{o}^{2}+2*g*x[/tex]
where:
Vf = final velocity [m/s]
Vo = initial velocity = 0 ( the ball is dropped)
g = gravity acceleration = 9.81 [m/s²]
x = distance = 38 [m]
Vf² = 0 + (2*9.81*38)
[tex]v_{f}=\sqrt{2*9.81*38} \\ v_{f} = 27.3 [m/s][/tex]
It takes a car 28 hours to travel 2,009 miles. What is the average speed of the car
A) 71 mph
B) 71.5 mph
C) 75 mph
D) 71.75 mph
Answer:
D 71.75
Explanation:
divide 2,009 miles by 28 hours
LeBron James runs 260 meters East, then realized he dropped is basketball. He turns around and walks 54 meters West until he finds his ball. It takes him 45 seconds for the full trip. How far away is he from where he started?
Answer:
206 meters East
Explanation:
Assuming that the starting point of Lebron James 0. He ran from point 0 to 260 meters in the Eastern direction. His displacement is now 260 meters to the East.
He then turned from the Eastern to the Western direction - opposing directions - and then walked 54 meters to find his ball. His displacement from the starting point will now be:
260 - 54 = 206 meters in the Eastern direction.
What wave is the safest of all the waves in the electromagnetic spectrum? Explain why.
Answer:
Radio waves.
Explanation:
Radio waves are at the far left of the EMS with a low frequency. Higher frequencies, such as Gama rays, cause more harm than the lower frequencies
On a wall, there are several 1 - 4 mm elongated drops with a large bloody rectangular patch in the center. The rectangle's long side faces toward the bottom of the wall. Running through the pattern are four smear lines about 0.5 - 1 cm apart and perpendicular to the bottom of the wall. No other marks are found on the other walls. Which best explains the sequence of events?
A. The victim was hit in the head with a blunt object, his face hit the wall, and his hand slid down along the wall as he collapsed.
B. The victim was shot with a gun and collapsed on the floor beneath.
C. The victim's throat was cut and he collapsed on the floor.
D. The victim was stabbed and cut multiple times before collapsing on the floor.
Answer: this might be wrong but my answer is A.
Explanation: it said "Running through the pattern are four smear lines about 0.5 - 1 cm apart and perpendicular to the bottom of the wall." and "perpendicular" is like not that big and not that small and A is "and his hand slid down along the wall as he collapsed." so I think it is A.
A car traveled 3000 m at a constant speed of 20 m/s. How long did it take to travel this distance?
Answer:
t = 150 [s]
Explanation:
To solve this problem we must take into account that the car travels at a constant speed, that is, there is no acceleration or it is equal to zero, therefore we can use the following equation of kinematics.
X = Xo + (v*t)
where:
x = final point [m]
Xo = initial point [m]
v = constant velocity = 20 [m/s]
t = time [s]
X - Xo = the distance traveled = 3000 [m]
3000 = 20*t
t = 150 [s]
Which receives the most solar radiation?
A the polar zones
B the oceans
C the tempetra zones
D the equator
Which receives the most solar radiation?
A the polar zones
B the oceans
C the tempetra zones
D the equator ✅
2 points
Make the following conversion: 0.95km to cm Hint: don't forget king
henry.......
*
95,000 cm
0.000095 cm
9,500 cm
95 cm
Answer:
95000cm
Explanation:
Given parameter:
0.95km
Problem;
Convert km to cm;
Solution:
100cm = 1m
1000m = 1km
So,
100,000cm = 1km
1km = 100,000cm
0.95km = 0.95 x 100000 = 95000cm
Rebecca is pushing her motorcycle down the road to a repair shop with a certain net force. If the net force is doubled, by how much does the acceleration change?
Answer:
If the net force is doubled the acceleration change in the same proportion, that is to say, it is doubled too.
Explanation:
We have that:
[tex] F = ma [/tex]
From the equation above we see that the acceleration is directly proportional to the force, so hence if the force is doubled:
[tex] F_{1} = ma_{1} [/tex]
[tex] 2F_{1} = ma_{2} \rightarrow a_{2} = 2\frac{F_{1}}{m} = 2a_{1} [/tex]
Therefore, If the net force is doubled the acceleration change in the same proportion, that is to say, it is doubled too.
I hope it helps you!
give five examples of renewable energy resource
Answer:
solar energy, wind energy, geothermal energy, hydropower, and Bioenergy
Answer:solar energy, wind energy, geothermal energy, hydropower, and Bioenergy
Explanation:let me know if that helped
Convert the following from °C to K: For example, 0°C = 273 K, and -100°C = 173 K.
50°C
10°C
17°C
-40°C
Explanation:
To convert from °C to K, we use the expression below;
tK = t°C + 273
tK = temperature in Kelvin
t°C = temperature in celcius
A. 50°C;
tK = 50 + 273 = 323K
B. 10°C;
tK = 10 + 273 = 283K
C. 17°C;
tK = 17 + 273 = 290K
D, -40°C
tK = -40 + 273 = 233K
A mischievous cat sees a flowerpot sitting at rest on a windowsill. If it takes 1.2 s for the flowerpot to fall from the window, how high up was the window?
Given that,
Initial speed of a cat is 0 because it was at rest.
If it takes 1.2 s for the flowerpot to fall from the window, we need to find the height reached by the cat.
Using second equation of motion to find it as follows :
[tex]d=ut+\dfrac{1}{2}at^2[/tex]
Put u = 0 and a = g
[tex]d=\dfrac{1}{2}gt^2\\\\d=\dfrac{1}{2}\times 9.8\times (1.2)^2\\\\d=7.05\ m[/tex]
So, it will move to a height of 7.05 m.
how does friction affect the speed
Answer:
Friction drag force causes objects to slow down as they move through a fluid, such as air or water. ... As an object's speed increases, the drag force from the fluid increases exponentially.
Answer:
Friction slows down an object using its rough surface
Explanation:
Friction is the force between objects. friction moves in the opposite direction which slows it down, it is very helpful when you want to stop a moving object
which of these is not a point source pollution
1. nitrates found in a river
2. someone dumping used oil in their backyard
3. factory smokestack
4. leaking oil tanker
2. Essential Question - What is the smallest particle of sugar (glucose - C6 H12 O6) that is still sugar? Element or Molecule and explain why
PLeasseee help me!!
Answer:
Molecule
Explanation:
A molecule is the smallest particle of sugar (glucose - C6H12O6) or any other substance because a molecule possess all properties of that particular substance.
Molecules are responsible for all the chemical and physical properties of a substance, so molecules decided the properties of sugar as well. If the molecule will be broken, it will lose its properties. Sugar is composed of molecules that include 6 atoms of carbon, 12 atoms of hydrogen, and 6 atoms of oxygen.
Hence, the correct answer is "Molecule".
A penny is dropped from the top of a 240.0 m building and is in
free fall. How long will it take
the penny to hit the ground?
O 24.5 sec
3.5 sec
7 sec
O 5 sec
Answer:
It would take 5
18.3
Explanation:
It depends on how fast it comes and the timing
A balloon has a mass of 104g and a volume of 7 cm. What is its density?
54 S
13.2
cm
14.868
Cm
0.07
cm
Answer:
14.868
Density equals mass divided by volume
On a aircraft carrier, a fighter jet goes from rest to a velocity of 250 mph (miles per hour) when it takes off. It does this in 3 seconds. What is it acceleration ?
Answer:
37.25m/s
Explanation:
Acceleration is the change in velocity of an object with respect to time.
Acceleration = velocity/time
Given
Velocity = 250mi/hr
Convert to m/s
1mile = 1609.344m
1hr = 3600s
250mi/hr = 250mi * 1609.344/1 * 3600
250mi/hr = 402366/3600
250mi/hr = 111.76m/s
Time = 3 seconds
Get the acceleration:
Acceleration = 111.76/3
Acceleration = 37.25m/s
Hence the acceleration is 37.25m/s
J.J. Thomson discovered the electron in 1897. In 1904, he proposed a model of an atom, describing that there was an equal distribution of negative and positive charges throughout the atom. In 1909, Ernest Rutherford tested J.J. Thomson’s model by shooting positive particles at gold foil. Based on Thomson's model, it was predicted that the particles would fly through the foil with a small amount deflected back. Analyzing the results, Rutherford discovered that more of the particles bounced back than expected. Which of the following best explains how the results of Rutherford’s experiment affected Thomson’s widely-accepted atomic model?
Answer:
the answer is b : Rutherford’s results supported parts of Thomson's model, but also provided new data and interpretations.
Explanation:
i read that and read the answers this is only logical one
A 12 volt battery is connected to two resistors in series. The first resistor has a resitance value of 5 Ohms and the current through the circuit is 1.5 Amps. What is the value of the second resistor? a. 9 Ohms b. 1.5 Ohms c. 5 Ohms d. 3 Ohms
Answer:
D. 3 Ohms
Explanation: