what does Constant / Controlled Variable mean in science
Answer:
variable that doesnt change
Explanation:
contolled variable is that variable that does not change throughout the course of the experiment
A body is uniformly accelerated from rest to a final velocity of 100m/s in 10 seconds.Calculate the distance covered
Answer:
Solution s =ut + ½ at 2 = 0×10 + ½ × 10×10 2 = 1000/2=500 m
Explanation:
The body is accelerating from stationary to a velocity of 100 m/s within 10 seconds. Thus, the distance covered is 500 m.
What is acceleration?Acceleration of a moving body is the rate of change in its velocity. Acceleration is a vector quantity having both magnitude and direction. The change in magnitude or direction or both in velocity causes an acceleration in the moving body.
The relation between distance with the velocity, acceleration and time is given as :
s = ut + 1/2 at²
The initial velocity u = 0 here
v = 100 m/s
t = 10 seconds.
acceleration = 100 /10 = 10 m/s²
Then the distance covered is calculated as follows:
s = 1/2 at²
= 1/2 10 m/s²× 10²
= 500 m
Therefore, the distance covered by the body is 500 m.
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How long would it take a machine to do 5000 joules of work if the power rating of the machine is 100 watts?
A. 0.2 s
B. 10 s
C. 50 s
D. 5 000 s
Answer:
hope this he;ps
Explanation:
power = work ÷ time
time = work ÷ power
time = 5,000 J ÷ 100 W
time = 50 s
What objects have orbital paths? A. the sun and stars
B. meteors and asteroids C. the planets and moons
Answer:
The planets and moons.
Explanation:
Planets follow an elliptical path around the sun (kinda oval shaped). Moons do the same to planets.
If one knew the luminosity of a star and measured its apparent brightness, which expression would one use to calculate the distance to the star
The expression which one would use to calculate the distance to the star is distance = sq. root. of (luminosity/4pi*apparent brightness)
What is Distance?
This is a scalar quantity and refers to how much ground a body has covered.
In a situation where parameters such as luminosity of a star and measured its apparent brightness are known then the distance to the star will be:
Distance= √(luminosity/4pi*apparent brightness)
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what does the expression of the power consumed by an electric appliances by a DC current? What is this unit of this power in SI?
Explanation:
dc stands for direct current it won't hurt u if u get in contact with dc but ac will be threatening to life
si unit is same as in ac (alternate current) and it is ampere or amp
what unit of the energy does a power company charge a consumer for
Many people use microwave ovens to cook their food with is best
Answer:
microwave ovens are better for crispy foods microwaves are better for re heating food or microwave food
Explanation:
A strong permanent magnet is difficult to move along the aluminum plate, but the magnet does not stick to the plate. Why is it like that ?
Because of its crystal scructure, usually under normal circumstances aluminum is not magnetic. This is why the magnet does not stick to the plate. The aluminium material is referred to as a paragmetic material, it shares this classification with other metals such as Lithium and Magnesium.
A 400g mass object at rest is acted on by a 200 N net force for 12 seconds. What is it’s final velocity?
The answer is supposed to be 6000 m/s but I’m not sure how…
Explanation:
do we can say that the first step is finding the acceleration of the object. We do so by saying F = ma
so a = F/m
a = 500 m/s^2
we now have the time, acceleration and initial velocity.
so we can find the final velocity by using one of newtons equations which is: vf = vi + at
so:
vf = 0 + 500 × 12
vf = 6000
note that our initial velocity was zero since the object was initially at rest.
if you still have any doubt dont hesitate to ask for further help.
define physical balance
A physical balance is simply a weight measuring instrument. It is used to measure the weight of any unknown object with the help of the other object with known weight.
Explanation:
Hope it helps you!!Explain Atmospheric Pressure and Wind
There are pros and cons to both e-readers and paper books. Do you think the pros outweigh the cons more for modern electronic readers, or for good old-fashioned paper books? Maybe it simply comes down to personal preferences as opposed to rational decision-making. Which do you prefer? Which do you think is better? Explain.
E-books have made it easier to carry books across long distances and have made learning simpler.
E-books or paper books?In the twenty first century, we have seen a sudden budding of technology such as have never been. Part of this mordern technology is the introduction of electronic books in several formats such as pdf, epub etc.
These books can be read on computers, ipads, laptops, sart phone etc having the appropriate reader software. These ebooks unlike the paper books have eased the inconvienence associated with carrying paper books which are often bulky from place to place.
Several ebooks could be housed at once in a smartphone and carried in the pocket. This has made learning easier than ever. Thus, ebooks are better than paper books.
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1) potential energy+kinetic energy is equal to
A. Gravitational potential energy
B. Thermal energy
C. Chemical energy
D. Mechanical emergy
2) …….. is the study of the composition & properties of matter
A. Ecology
B. Biology
C. Chemistry
D. Model
E. Atoms
3) building blocks of matter are called…
A. Mass
B. RNA
C. Neutrons
D. Atoms
E. Protons
4)the force you apply to a machine is the..
A. Efficiency
B. Input force
C. Output force
D. Resistance
5) friction within machinery increases efficiency
A. True
B. False
Please help<3
Explanation:
1) D.
the other answer options don't make any sense in that regard. these 2 forms of energy represent in total mechanical energy.
2) C. Chemistry
3) D. Atoms.
although, protons and neutrons are part of them.
4) B. Input force
5) B. False
friction causes energy to be diverted to doing unwanted and unnecessary things, like creating heat instead of movement.
How long does it take for a spaceship to get to the moon.
Answer:
about 3 days
It takes about 3 days for a spacecraft to reach the Moon. During that time a spacecraft travels at least 240,000 miles (386,400 kilometers) which is the distance between Earth and the Moon. The specific distance depends on the specific path chosen.
Explanation:
no explanation
Challenge question: An arrow is placed at 3 centimeters to the left of a converging lens. The image appears at 3 centimeters to the right of the lens. What is the focal length of this lens? (HINT: Place a dot to the right of the lens where the image of the tip of the arrow will appear. You will only be able to draw lines 1 and 2. Where does line 1 cross the principal axis if the image appears at 3 centimeters?)
The focal length of the converging lens based on the arrow placed 3 centimeters to the left and the imaged formed 3 cm to the right is 1.5 cm.
Focal length of the converging lensThe focal length of the converging lens is determined by applying the following converging lens formula.
1/f = 1/v + 1/u
where;
v is the image distance = 3 cmu is the object distance = 3 cmf is the focal length = ?1/f = 1/3 + 1/3
1/f = 2/3
f = 3/2
f = 1.5 cm
Thus, the focal length of the converging lens is 1.5 cm.
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The symbol equation for combustion of a hydrocarbon is shown below. What number will go before the oxygen reactant when this equation is balanced?
Answer:
5 Oxygen , 3 Carbon dioxide and 3 water
Answer: the answer is 5
Barton conducts an experiment using three metallic bars that might be magnets. the bars are labeled a, b, and c. the ends of each bar are numbered 1 or 2. 3 rectangles aligned horizontally end to end. the first has 1 a 2 on it. the second has 1 b 2 on it. the third has 1 c 2 on it. he places the end of one bar close to an end of a second bar and records his results in the table shown. a 3 column table with 3 rows. the first column is labeled end with entries a 1, a 2, b 2. the second column is labeled end with entries b 1, c 1, a 1. the last column is labeled result with entries attract, repel, attract. based on the data, which prediction should he expect to occur? a2 repels b1. c2 attracts b2. b1 repels c1. a1 attracts c2.
The prediction should the expect to occur will be C₂ attracts B₂. This is due to the fact that like charges repel while the unlike charges attract each other.
What is a magnet?A magnet is an iron piece or of other material with its constituent atoms arranged in such a way that it shows magnetism qualities,
Like charge attracting different iron-containing objects or engaging itself in a magnetic field.
The given metallic bars are A, B, and C. Every end of the magnet is denoted with the 1 and 2.
The denotation to the magnet is given as;
A₁A₂
B₁B₂
C₁C₂
He places the end of one bar close to an end of a second bar. The end of magnets C₂ and B₂ are of unlike charges. As we know that the unlike charges attract each other.
So that the C₂ and B₂ due to the unlike charge ends attract each other.
Hence the prediction should the expected to occur will be C₂ attracts B₂
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Answer:
b
Explanation:
so you dont have to read the long one
someone give me excuses for not having your pe kit
Questions #7 and 8:
Part 1 of 2: An ideal gas, initially at a volume of 6.22222 L and pressure of 9 kPa, undergoes isothermal expansion until its volume is 8 L and its pressure is 7 kPa. Calculate the work done by the gas during this process. Answer in units of J.
Part 2 of 2: Find the heat added to the gas during this process. Answer in units of J.
(a) The work done by the ideal gas during the isothermal exapnsion process is -3.556 J.
(b) The heat added to the gas during this process is 3.556 J.
Work done by the ideal gas
The work done by an ideal gas in isothermal expansion is change in pressure and volume of the gas. The change in the internal energy of the gas is zero.
The work done by the given ideal gas is calculated as follows;
W = ΔPV
where;
ΔP is change in pressure of the gasΔV is change in volume of the gasW = (P₂ - P₁)(V₂ - V₁)
W = (7kPa - 9kPa)(8L - 6.222L)
W = -3.556 kPa.L
1 kPa.L = 1 J
W = -3.556 J
Heat added to the processΔU = q + w
where;
ΔU is change in internal energy = 00 = q + (-3.556)
q = 3.556 J
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4. Find the number of electrons transferred between two points kept at a potential difference of 20 V if 40 J of work is done
Required answer :-
Number of electrons transferred are 1.25 × 10^19Given :-
V = 20 Volt W = 40 JWe know that,
↠ W = P × t
↠ W = V × I × t
↠ W = V × Q/t × t
↠ W = V × Q
On substituting values, we get
↠ 40 = 20 × Q
↠ Q = 40/20
↠ Q = 2 c
↠ ne = q
↠ n = q/e
↠ n = 2/ 1.6 × 10^- 19
↠ n = 1.25 × 10^19
Hence,
Number of electrons transferred are 1.25 × 10^19
Most newer homes are built with a circuit breaker that can
handle a maximum of 200 A of current. If a home is using
the maximum amount of current possible, which is flowing
every 2 seconds, how many coulombs of charge are flowing
into the house? Explain.
The coulombs of charge which are flowing into the house is 400 coulombs.
What is Electric charge?This is the physical property of matter that causes it to experience a force when placed in an electromagnetic field and its unit is Coulomb.
Electric charge(Q) = It where I is current and t is time
Q = It
= 200A × 2s
= 400 coulombs
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How does surface type affect speed?
Answer:
Slick and smooth surfaces mediate friction to a low, allowing an object to speed across it with low resistance.
Explanation:
How to prepare for physics ATP exam o'levels?
Spend time on this subject. Physics may have some concepts which are difficult for students to understand in some cases. A key example is electricity and magnetism. Spend extra time on topics you find difficult and most of all, remember to do PAST PAPERS. These will be your light in the dark, your teachers, your friends. Continue to do them, and remember to leave one unsolved before your examinations. This will orient your mind for the examination and let you achieve the maximum marks possible.
Hello people ~
When a comb rubbed with dry hair attracts pieces of paper. This is because the______
(a) comb polarizes the piece of paper
(b)comb induces a net dipole moment opposite to the direction of field
(c)electric field due to the comb is uniform
(d) comb induces a net dipole moment perpendicular to the direction of field
[tex]\bold{Heya!}[/tex]
Answer :-(b) comb induces a net dipole moment opposite to the direction of field.
Explanation :-When a comb rubbed with dry hair it's attracts pieces of piece of paper. This is because the comb that induces of the dipole net that of the moment thatopposite of the field. And, This happens the field dueing to charge of the comb induces of the dipole moment in the paper of the molecules in the dielectric.
Hopefully This Helps ! ~
#LearnWithBrainly
[tex]\underline{Answer :}[/tex]
Jaceysan ~
Answer:
Option B
Explanation:
When a comb is rubbed with dry hair it induces some charge or its get charged either positive or negative
As paper remains in neutral hence it attracts the paper
Hence option B is correct
Which force is responsible for holding the nucleus together via gluons.
Plants cause weathering, too. a seed that falls into a crack in a rock may grow there. growing roots may push on and enlarge the crack, what is this process called question 3 options: chemical weathering mechanical weathering root-pry pedalfer
The process which involves plants to cause weathering to a seed that falls into a crack in a rock therefore, breaking apart the rock is called Mechanical weathering.
Mechanical weatheringThis is defined as the set of weathering processes that break apart rocks into particles (sediment) through physical processes. The most common form of mechanical weathering is the freeze-thaw cycle. Water seeps into holes and cracks in rocks then the water freezes and expands, therefore making the holes larger eventually making the rock split apart.
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Answer:
root-pry
Explanation:
i took the test
If a rock on a cliff starts with 3,000 J of GPE and 0 J of KE and ends with 0 J of GPE and 5,000 J of KE, what law of physics would this violate?
The law of physics that this scenario would violate is the law of conservation of energy.
What is the law of conservation of energy?The law of conservation of energy states that energy possessed by an object or physical body can neither be created nor destroyed but can only be transformed from one form to another.
This ultimately implies that, the energy possessed by the rock at the beginning must be equal to the energy possessed by the rock at the end in accordance with the law of conservation of energy.
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Name all the energy transfers that occur to make a solar-powered traffic light work (name what generates the energy, and what kind of energy it turns to):
The students changed the release distance of the sphere during their investigation. Which statements best describe the purpose for increasing the release distance between the trials? Select all that apply.
A. to indicate balanced forces are acting on the spheres
B. to determine the types of forces acting on the spheres
C. to measure the strength of the force acting on the spheres
D. to change the direction of the force acting on the spheres
E. to observe the effect of unbalanced forces acting on the spheres
Since unbalanced forces acts on the spheres, the aim of increasing the release distance of the spheres is to observe the effect of unbalanced forces acting on the spheres.
What is an experiment?An experiment is a study whose objective is to study cause and effect relationships. In this case, the students had to increase the distance at which the spheres was released.
The aim of increasing the release distance of the spheres is to observe the effect of unbalanced forces acting on the spheres.
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Heat Capacity is a measure of the heat required to raise the temperature
of 1g of a substance by 1°C.
So...
True or False:
Water has a very high heat capacity, which means it resists changing
temperature when heat is added or removed.
A
True
B
False
Answer: i would say true uwu
Explanation:hope this helps!
....Max-