Answer:
the acceleration of the car is -5 m/s².
Explanation:
Given;
initial velocity of the car, u = 50 m/s
time of motion, t = 6 s
final velocity of the car, v = 20 m/s
The acceleration of the car is calculated as;
[tex]a = \frac{v-u}{t} \\\\a = \frac{20-50}{6} \\\\a = - 5 \ m/s^2[/tex]
Therefore, the acceleration of the car is -5 m/s².
How does physical fitness best reflect having a scientific foundation (connected to science)?Explain
Explanation:
Physical fitness is a state of health and well-being and, more specifically, the ability to perform aspects of sports, occupations and daily activities. Physical fitness is generally achieved through proper nutrition, moderate-vigorous physical exercise, and sufficient rest.
Physical fitness is generally achieved through exercise. Photo shows Rich Froning Jr. – four-time winner of "Fittest Man on Earth" title.
Before the industrial revolution, fitness was defined as the capacity to carry out the day’s activities without undue fatigue. However, with automation and changes in lifestyles physical fitness is now considered a measure of the body's ability to function efficiently and effectively in work and leisure activities, to be healthy, to resist hypokinetic diseases, and to meet emergency situations.
A 6 cm object is 8 cm from a convex lens that has a focal length of 2.7 cm. The image is 4 cm from the lens.
The height of the image is
cm ______
Answer:
3cm
Explanation:
The height of the image will be "3 cm".
Convex lensAccording to the question,
Size of object, u₀ = 6 cm
Distance of object, u = 8 cm
Focal length, f = 2.7 cm
Distance of image, v = 4 cm
Let,
Height of image be "[tex]v_i[/tex]".
We know the formula,
→ Magnification, M = [tex]\frac{Distance \ of \ image}{Distance \ of \ object}[/tex]
By substituting the values, we get
= [tex]\frac{4}{8}[/tex]
= 0.5
hence,
The image's height be:
→ M = [tex]\frac{Height \ of \ image \ (v_i)}{Height \ of \ object \ (u_0)}[/tex]
0.5 = [tex]\frac{v_i}{6}[/tex]
By applying cross-multiplication,
[tex]v_i[/tex] = 0.5 × 6
= 3 cm
Thus the response above is correct.
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Which of the following describes how energy is converted when a cat knocks a plant off of a counter?
A. The potential energy of the car is converted into kinetic energy.
B. The kinetic energy of the cat is converted into potential energy.
C. The potential energy of the plant is converted into kinetic energy.
D. The kinetic energy of the plant is converted into potential energy.
Answer:
c
Explanation:
tell me if im write
How long will it take a bear to run 45 meters if it is traveling at 10m/s
Part A: Multiple TRUE/FALSE
1. Which of the following statements about vectors and scalars are TRUE? List all that apply.
- A vector is a large quantity and a scalar is a small quantity.
- A scalar quantity has a magnitude and a vector quantity does not.
- A vector quantity is described with a direction and a scalar is not.
-Scalar quantities are path dependent quantities and vector quantities are not.
- A scalar quantity depends only upon the initial and final values of the quantity; this is not the case for vector quantities.
- The quantity 20 m/s, north is a speed and as such is a scalar quantity.
- The quantity 9.8 m/s/s is an acceleration value and as such is a vector quantity.
A vector quantity is described with a direction and a scalar is not.
Scalar quantities are path-dependent quantities and vector quantities are not.
Explanation:
Scalar quantity:
It is a physical quantity that only has magnitude.It is a 1-dimensional Its changes when magnitude changes.It can't be resolved.It is a path-dependent quantity.If any mathematical operation is applied between two or more scalar quantities will give a scalar.For example: mass, time, energy, etcVector quantity
It is a physical quantity that has magnitude and direction.It can be the 1-dimensional,2-dimensional, or 3-dimensional Any change in it changes its direction or magnitude or both.It can be resolved.It only depends on the initial and final values of quantities.If any mathematical operation is applied between two or more vector quantities will give a scalar or vector.For example: force, velocity, pressure, etc.So from this, we can conclude that the true statements out given statements in the question are:
A vector quantity is described with a direction and a scalar is not.
Scalar quantities are path-dependent quantities and vector quantities are not.
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A car is launched by a spring and goes to the top of a loop. Fill in the energy bar chart by drawing a vertical bar(s) in the correct position (both Initial & Final conditions).
Answer:
A) the initial point all energy is elastic potential and the final point all energy is kinetic
B) a bar graph the two bars have the same height and the sum of their height is the initial energy
C) two bars, one for the kinetic energy and the other for the gravitational potential energy.
Explanation:
A) For this exercise we must use the energy conservation relations
starting point. When the spring is compressed
Em₀ = K_e = ½ k x²
end point, at the bottom of the loop
Em_f = K = ½ m v²
energy is conserved
Em₀ = Em_f
½ k x² = ½ m v²
v = [tex]\sqrt{ \frac{k}{m} }[/tex] x
In a bar graph the initial point all energy is elastic potential and the final point all energy is kinetic
B) intermediate point in a quarter of the radius
In this case we use the lower part of the loop as the starting point and the quarter part of the bow as the end point.
Em₀ = K
Em_f = K + U = ½ m v² + m g R
in a bar graph the two bars have the same height and the sum of their height is the initial energy
C) End point highest part of the loop
starting point, bottom of loop
Emo = K = ½ m v₀²
from part A of the exercise we saw that it is equal to the elastic energy of the spring
final point. Highest part of the loop
Emf = K + U
Em_f = ½ m [tex]v_{f}^2[/tex] + mg (2R)
where R is the radius of the loop
Em₀ = Em_f
1/2 m v₀² = 1/2 m v_{f}^2+ mg 2R
v₀² = v_f^2 + 4gR
In a bar graph there are two bars, one for the kinetic energy and the other for the gravitational potential energy. The sum of the heights of these bars is the initial energy, so the energy is transformed but not created or destroyed in the process.
What is Newton's 2nd law dealing with acceleration
Answer:
Newton's second law of motion pertains to the behavior of objects for which all existing forces are not balanced. The second law states that the acceleration of an object is dependent upon two variables - the net force acting upon the object and the mass of the object. The acceleration of an object depends directly upon the net force acting upon the object, and inversely upon the mass of the object.
Explanation:
Why might a PC monitor be covered with dust?
After gaining electrons from the cloth, can the polythene rod attract small pieces of paper?
Answer:
The attractive forces between the dust particles and Television Screen is due to static electricity. The free dust particles have some residual charge due to force of friction from air or colliding dust particles while the television screen has an opposite charge. They attract and dust settles on it.If a polythene rod is rubbed with cloth, the rod can lift small pieces of paper. This can be explained by stating that the rod becomes charged. A charged object will attract a neutral object until it touches and then it is repelled.Explanation:
pls pls help me out AHH, what is not true about MEIOSIS?
A. The chromosomes in the daughter cells half the number from the parent cell.
B. The chromosomes in the daughter cells are the same number as the parents cell.
C. The only cells that will undergo meiosis will become sperm or egg cells used for reproduction.
D. The shuffling of genes happens in meiosis.
Answer:
B.
Explanation:
This is not true as the number of chromosomes in the daughter cells are half the number in the parent's cells
Examine the cross-sectional slice of a stem of a mint plant. Which statement most specifically describes mint?
The available options are:
Mint is a dicot.
Mint is a monocot.
Mint is an angiosperm.
Mint is a bulb plant.
Answer:
Mint is a dicot.
Explanation:
Given the fact that Mint is considered to be a member of Lamiaceae, an angiosperm plant which is characterized by typically having leaves that consist of reticulate vacation and appears like veins in structure. It also has a seed that contains two cotyledons.
Hence, it is considered a DICOT PLANT due to these characteristics. The botanical name of Mint is referred to as Mentha arvensis.
Answer: A
Explanation:
Which will ensure laboratory safety during the experiment? Check all that apply. using beaker tongs to handle the hot beaker reading the thermometer accurately checking the beaker for chips prior to heating on the hot plate using a beaker instead of an Erlenmeyer flask turning off the hot plate after use
Answer: • using beaker tongs to handle the hot beaker.
• checking the beaker for chips prior to heating on the hot plate.
• Turning off the hot plate after use
Explanation:
The options that will ensure laboratory safety during the experiment will be:
• using beaker tongs to handle the hot beaker.
• checking the beaker for chips prior to heating on the hot plate.
• Turning off the hot plate after use.
We should note that the beaker tongs are simply used in the holding of the beakers that have hot liquids in them. Also, it s vital for the hot plate to be turned off after its use so as to prevent accident.
Using beaker tongs to handle the hot beaker reading the thermometer accurately checking the beaker for chips prior to heating on the hot plate ensure laboratory safety throughout the experiment:
What is an experiment?An experiment is a technique used to prove or disprove a theory, or to test the efficiency or probability of something that has never been done before.
Experiments reveal cause-and-effect relationships by illustrating what happens when a specific component is changed.
The following options will ensure laboratory safety throughout the experiment:
1.Handling the heated beaker using beaker tongs.
2.Inspecting the beaker for chips before heating it on the hot plate.
3.After using the hot plate, turn it off.
Hence all the given options are correct.
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frequency of sound determines its _____ measured in _____.
amplitude: amplitude of sound wave determines its _____ measured in _____.
Answer:
Loudness of sound is determined by its amplitude.
Loudness of sound is determined by its amplitude.The intensity or loudness of a sound depends upon the extent to which the sounding body vibrates, i.e., the amplitude of vibration. A sound is louder as the amplitude of vibration is greater, and the intensity decreases as the distance from the source increases.
Beryllium has a charge of +2, and bromine has a charge of –1. Which is the best name for the ionic bond that forms between them? beryllium bromide beryllium bromine bromine berylliumide bromide berylliumide
Answer:
Beryllium bromide
Explanation:
There exists 2 elements in the question
Beryllium Be with valence of +2, and it's a metal
Bromine Br with a valence of -1, and is a non - metal.
Both of them combine together forming an ionic bond:
Be + Br(2) -> BeBr(2)
In naming the compound, we would say that since the first is a metal, beryllium, and the second being a halogen, bromine. We name it by calling the first name together with the last name and changing the last name of the non metal from -ine to -ide.
So we have, Beryllium Bromide.
Answer: A. Beryllium Bromide
Explanation:
Got it right on edge 2023
Aponte a alternativa correta que faz a relação entre energias renováveis e sustentabilidade - O investimento em energia renovável ajuda o meio ambiente e a diminuição dos gases de efeito estufa e destruição da natureza -Não a relação entre esses dois conceitos, pois o desenvolvimento sustentável esta ligado a produção de materiais recicláveis -O desenvolvimento sustentável esta agregado ao desenvolvimento econômico e não com energias renováveis -A produção de carros elétricos só vai aumentar a poluição do ar
Answer:
letra a
Explanation:
Which of the following quantities is a vector?
A. 400 gallons per minute
B. 312 days
C. 1056 grams
D. 3 feet per second north
Answer:
D
Explanation:
vectors have direction!
The Gulf Stream is an ocean current that runs from the southern tip of Florida up the eastern coast of the U.S. And ends in the North Atlantic. How would this Northern flowing stream affect the coast of Europe?
Answer:
The Northern flowing stream will affect the coast of Europe by making climate of Western Europe and Northern Europe to be warmer than other areas that are located around the same latitude and this is simply because of the North Atlantic Current
Explanation:
The Northern flowing stream will affect the coast of Europe because the North Atlantic current causes the Gulf stream to be split into two ( 2 ) and the Northern stream which is a warm stream crossing over to Northern Europe. The Gulf stream makes climate of Western Europe and Northern Europe to be warmer than other areas that are located around the same latitude and this is simply because of the North Atlantic Current
If a wave is traveling at a certain speed and it's frequency is doubled,what happens to the wavelength of that water
Answer:
If the frequency is doubled the wavelength is only half as long.If you put your fingertip in a pool of water and repeatedly move it up and down,you will create circular water waves.
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The driver of a 1.5 x 10^3 kg car is traveling cast at 10 ms and increases its speed to 30 m/s east over 15 seconds. What is the initial and final momentum of the body? What is the net force acting on it?
Answer:
See explanations below
Explanation:
Force = m(v-u)/t
mass m = 1.5*10^3kg = 1500kg
v = 30m/s
u = 10m/s
Time t = 15secs
F = 1500(30-10)/15
F = 1500(20)/15
F = 100 * 20
F = 2000N
Force acting on it is 2000N
momentum = mass * velocity
final momentum = 1500 * 30
final momentum = 45000kgm/s
initial momentum = 1500 * 10
initial momentum = 15000kgm/s
The initial momentum, Final momentum and net force acting on the body are 15000 kgm/s, 45000 kgm/s, and 2000 N respectively.
To solve for initial momentum, Final momentum, and average force, we use the formulas below.
⇒ Formulas
M = mu................. Equation 1M' = mv................... Equation 2F = M'-M/t................ Equation 3⇒ Where:
M = Initial momentum of the carM' = Final momentum of the caru = Initial velocity'v = Final velocityt = timeF = net force acting on the car.From the question,
⇒ For The Initial momentum
m = 1.5×10³ kgu = 10 m/s east⇒ Substitute these values into equation 1
M = 1.5×10³×10M = 15000 kgm/sAlso for Final momentum,
⇒ Given:
v = 30 m/s⇒ Substitute into equation 2
M' = 1.5×10³×30M' = 45000 kgm/sAnd finally for net force,
⇒ Given:
t = 15 seconds⇒ substitute into equation 3
F = (45000-15000)/15F = 30000/15F = 2000 NHence,The initial momentum, Final momentum and net force acting on the body are 15000 kgm/s, 45000 kgm/s and 2000 N respectively.
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An arrow is fired at 5.20 m s−1 at an angle of 22.0° above the horizontal. Find the horizontal component of the initial velocity, expressing your answer in m s−1 to 2d.P.\
Answer:
[tex]4.82ms^{-1}[/tex]
Explanation:
We are given that
Initial velocity, u=5.20m/s
[tex]\theta=22^{\circ}[/tex]
We have to find the horizontal component of the initial velocity.
We know that
Horizontal component of velocity=[tex]ucos\theta[/tex]
Using the formula
Horizontal component of the initial velocity=[tex]5.2cos22^{\circ}[/tex]
Horizontal component of the initial velocity=[tex]5.2\times 0.9272[/tex]
Horizontal component of the initial velocity=[tex]4.82ms^{-1}[/tex]
Hence, the horizontal component of the initial velocity=[tex]4.82ms^{-1}[/tex]
Match the type of boundary with it's characteristic
Answer:
Transform= not destroyed or created
Divergent= crust created
Convergent= crust destroyed
Explanation:
The plates move in the opposite or away from each other at a transforming plate boundary. The two platform borders are not produced or destroyed in this case. As both plates converge on each other and thus destroy the plates for converging plate boundaries. When the plate is divergent, both plates shift away from each other by opening up and solidification for a new crust.
Answer:
Transform= not destroyed or created
Divergent= crust created
Convergent= crust destroyed
Explanation:
3. Waves in a lake are 6.0 m apart and pass a person on a raft every 2.0 s.
What is the speed of the waves?
The speed of wave is 3m/s
What is a Wave Equation ?It is a linear second order partial differential equation which describe the propagation of oscillation at a fixed speed in some quantity .
Since , f = 1/t
f = 1/2 = 0.5 Hz
from wave equation
v(speed) = frequency * wavelength
v(speed ) = 0.5 * 6
v(Speed) = 3 m/s
Hence , The speed of wave is 3m/s
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Can you find the net force of one vertical force and one horizontal force, such as in the picture below? Yes or no, and why?
Answer:
jwuwhisbuebeu said that good morning and private s the
Answer:
the answer to this question is a⁵/c²
Please help me on these 2 questions!! I'm counting on you guys
Answer:
b and you mom is cute so it's nice I'm here for points
2) Which tricks do you use to reduce pressure in everyday activities?
Answer:
Explanation:
Increase activity and exercise more. ...
Lose weight if you're overweight. ...
Cut back on sugar and refined carbohydrates. ...
Eat more potassium and less sodium. ...
Eat less processed food.
Flies could be prey to predator plants, too what plant snacks on this fly?
Answer:
A Venus Fly trap
Explanation:
Insectivorous plants like pitcher plant and venus fly trap snack on flies or insects.
InsectivorousPlants which feed on insects are the insectivorous plants.These plants have special structures like leaves which help in trapping insects.The insects die in the enzymes and acidic juices so produced by the plant. The insects provide nourishment to these plants.
Therefore, insectivorous plants like pitcher plant and venus fly trap snack on flies or insects.
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Which way do the players on the court rotate during a game? What happens if the players serve out of order?
Answer:
Explanation:
on volleyballit's clockwise and What Would Happen If Someone Served Out Of Order? If the wrong player on your team serves because it's not their turn, the point and the possession of the serve will go to your opponents.
The frequency of a sound wave corresponds to its
What’s I called when a HORIZONTAL VELOCITY DIVIDED BY VELOCITY.
An airplane is flying in a horizontal circle at a speed of 100 m/s. The 80.0 kg pilot does not want the centripetal acceleration to exceed 7.00 times free-fall acceleration.
Answer:
The force will be "5,488". A further solution is provided below.
Explanation:
The given values are:
speed,
v = 100m/s
mass,
m = 80 kg
acceleration,
a = 7
Now,
Radius will be:
⇒ [tex]r=\frac{v^2}{ac}[/tex]
⇒ [tex]=\frac{(100)^2}{7\times 9.8}[/tex]
⇒ [tex]=\frac{10000}{68.6}[/tex]
⇒ [tex]=145.77[/tex]
Force will be:
⇒ [tex]F=m\times ac[/tex]
⇒ [tex]=80\times 68.6[/tex]
⇒ [tex]=5488[/tex]
30. A force is exerted on a box and an equal and opposite force is exerted by
the box. What explains this?
a conservation of energy
b Newton's first law of motion
c Newton's second law of motion
d Newton's third law of motion
Newtons third law of motion
Explanation:
According to Newtons third law of motion: Every action has an equal and opposite reaction.