Answer:
Explanation:
Ff
The unit we use to measure speed is
Answer:
However, to mention a few, there are other units of speed such as meters per second, feet per second, light-years per millennium, and knots. Feet per second, but specially meters per second are usually used to measure speed of animals, humans, and free fall objects. Knots is used to measure the speed of ship and/or boats.
Explanation:
Unlike secondary pollutants,
pollutants are
released directly into the air by natural processes or by human
activities
Answer:
True
Explanation:
The force needed to stop an object in motion is called?
force called friction
The force applied to object to stop its motion is known as frictional force.
Newton's first law of motion states that an object in a state of rest or uniform motion in a straight line, we continue in that form unless it is acted upon by an external force. This reluctance of an object to move or stop moving is known as the object's inertia. This inertia depends on the mass of the object.
When an object is finally in motion, the friction, between the object and the surface on which it is moving tends to limit the motion.
Thus, to stop an object in motion, we increase the frictional force between the object and the surface on which the object is moving
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Noah Formula is in airplane which is flying at constant speed in a circular course of radius 5000 m., circling O'Hare Airport prior to landing. Noah observes that the plane completes each round trip in 400 seconds. What is the speed of the airplane? What is centripetal acceleration?
Answer:
(a). The speed of the airplane is 78.53 m/s.
(b). The centripetal acceleration 1.234 m/s².
Explanation:
Given that,
Radius = 5000 m
Time = 400 second
We need to calculate the speed of the airplane
Using formula of speed
[tex]v=\dfrac{d}{t}[/tex]
[tex]v= \dfrac{2\pi r}{t}[/tex]
Put the value into the formula
[tex]v=\dfrac{2\times\pi\times5000}{400}[/tex]
[tex]v=78.53\ m/s[/tex]
We need to calculate the centripetal acceleration
Using formula formula
[tex]a=\dfrac{v^2}{r}[/tex]
Put the value into the formula
[tex]a=\dfrac{78.53^2}{5000}[/tex]
[tex]a=1.234\ m/s^2[/tex]
Hence, (a). The speed of the airplane is 78.53 m/s.
(b). The centripetal acceleration 1.234 m/s².
A student leaves a pencil on a desk and the pencil stays in the same spot until another student picks it up. Which law would that be?
The first law
In Newtons first law it states that an object will not change its motion unless a force acts upon it.
Answer:1st law
Explanation:
How far will a 50 N crate be moved if 500 J of work are accomplished?
An electric current of 0.05 A passes through a circuit that has a resistance of
15 2. According to Ohm's law, what is the voltage of the circuit?
A. 15.1 V
B. 300 V
C. 0.003 V
D. 0.75 V
The voltage of the circuit will be 0.75 V.The potential difference between the circuit is known as the voltage.
What is ohm’s law?Ohm's law claims that the voltage across a conductor is directly proportional to the current flowing through it.
This current-voltage connection may be expressed mathematically as,
The Equation of Ohm's Law
[tex]\rm V=IR \\\\ V= 0.05 \times 15.2 \\\\\ \rm V=0.75 \ V[/tex]
The voltage of the circuit will be 0.75 V.
Hence option D is correct.
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Please help!! i will mark brainly
Answer:
The object sped up, moved at constant speed, then slowed down.
The image below shows the same egg in water (on the left) and in seawater (on the right). What must be true about these liquids?
a
The seawater is less dense than the plain water
b
The seawater is denser than the plain water
c
The plain water and the seawater have equal densities
d
It is impossible to tell which liquid is denser
Answer:
C
Explanation:
the correct answer is C
How does a transistor work?
i need three examples !
Answer:
A transistor works when the electrons and the holes start moving across the two junctions between the n-type and p-type silicon. ... By turning a small input current into a large output current, the transistor acts like an amplifier. But it also acts like a switch at the same time.
Explanation:
A thin plastic rod of length 2.5 m is rubbed all over with wool, and acquires a charge of 75 nC, distributed uniformly over its surface. Calculate the magnitude of the electric field due to the rod at a location 7 cm from the midpoint of the rod. Do the calculation two ways, first using the exact formula for a rod of any length, and second using the approximate formula for a long rod.
Answer:
find out the le
Explanation:
What is the wavelength of a wave with a frequency of 466 Hz and a speed of
343 m/s?
A. 1.35 m
B. 0.74 m
C. 1.6 x 105 m
D. 6.25 x 10-6 m
Answer:
The answer is option BExplanation:
The wavelength of a wave can be found by using the formula
[tex] \lambda = \frac{c}{f} \\ [/tex]
where
c is the speed of the wave
f is the frequency
From the question
c = 343 m/s
f = 466 Hz
We have
[tex] \lambda = \frac{343}{466} \\ = 0.73605150...[/tex]
We have the final answer as
0.74 mHope this helps you
Answer: B: 0.74 m
Explanation:
Hope this helps / I did this question.
What is the name of the system for conducting a scientific investigation?
1. Comparative analysis
2. Scientific Method
3. Evaluation Process
4. Trial by error
Answer:
i beleive it is 2
Explanation:
What did scientists create using scientific measurements?
Answer:
lines?
Explanation:
In recent years, assistive technologies have been developed to give people with disabilities equal access to resources. Apex
Answer:
as businesses became aware of the demand for equal access, they began t invest in research and development to meet the desires of their costumers.
Explanation:
just took the test, still failing :D
What speed should a spaceship of mass 5.21 x 107kg moving around a planet
only by the gravitational force be, if the distance between them is 6.27 x 108 m
and the mass of the planet is 4.76 x 1026 kg? Estimate G as 6.67 * 10-11 N (m/kg)
A. 7.12 x 103 m/s
B. 6.23 x 103 m/s
С. 4.25 x 103 m/s
D. 7.43 105 m/s
E. 7.25 x 103 m/s
Answer: A
Explanation:
The speed of the spaceship moving around a planet only by the gravitational force is 7.12 × 10³ m/s.
What is centrifugal force?A fictitious force that moves in a circle and is directed away from the center of the circle is called centrifugal force. When measurements are taken in an inertial frame of reference, the force does not exist. It only becomes relevant when we switch from a ground/inertial reference frame to a rotating reference frame.
The centrifugal force's unit is newton.
As the gravitational force is balanced by centrifugal force is orbital motion:
Gravitational force =centrifugal force
GMm/r² = mv²/r
v² = GM/r
v = √( GM/r)
= √(6.67×10⁻¹¹ ×4.76 ×10²⁶/6.27 ×10⁸)
= 7.12 × 10³ m/s.
Hence, The speed of the spaceship is 7.12 × 10³ m/s. Hence, option (A) is correct.
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Calculate the distance a baseball will travel if it moves at a speed of 30 m/s for 2.5 seconds.
Answer:
speed = 12 miles per second
= 12 mi/s
Explanation:
In addition to hot surface temperatures, which characteristic makes mercy different from earth
Answer:
has no air on it and no animals or plants live there.
Which statement about mass and inertia is not true?
A. Both mass and inertia play a role in Newton's first law.
B.Mass is a quantitative measurement of inertia.
C. The tendency of an object to remain at rest results from a property called inertia.
D.Newton's first law is sometimes called the relative inertia law.""
Answer:
D. Newton's first law is sometimes called the relative inertia law.
Explanation:
Newton's first law of motion states that an object at rest will stay at rest and that in motion will stay in motion with same speed and in the same direction unless an unbalanced force acts on it. It is also called the law inertia. Mass and inertia play a role in this law because mass is a quantity that mainly depends on inertia in that a body with more inertial will exhibit more mass.
A student ties a ball at the end of a string and whirls the string at a constant speed. If the radius of the circle along which the ball moves is 1.2 m and the acceleration is 7.5 m/s2what is the speed of the ball?
a = v ² / R
where a is acceleration, v is speed, and R is the radius. So
7.5 m/s² = v ² / (1.2 m)
v ² = (7.5 m/s²) / (1.2 m)
v ≈ 6.8 m/s
A cannonball is launched off a 100 m cliff horizontally with an initial velocity of 50 m/s. The goal is to have the cannonball travel a target distance of 400m. Based on this, will the cannonball reach the target distance?
A. Yes, the cannonball will hit its goal
B. More information is needed to determine the outcome
C. No, the cannonball will overshoot its goal
D. No, the cannonball will fall short of the goal
self note *9
Answer:
D. No, the cannonball will fall short of the goal
Explanation:
Based on the information given in the problem, No, the cannonball will fall short of the goal, therefore the correct answer is option D.
What are the three equations of motion?There are three equations of motion given by Newton,
v = u + at
S = ut + 1/2×a×t²
v² - u² = 2×a×s
As given in the problem a cannonball is launched off a 100 m cliff horizontally with an initial velocity of 50 m/s. The goal is to have the cannonball travel a target distance of 400 meters,
By using the second equation of motion in the vertical direction,
100 = ut + 0.5*9.81*t²
t = 4.51 seconds
The distance traveled by the cannonball in the horizontal direction at the same time = 4.51*50
=205 meters
Thus, based on the information given in the problem, No, the cannonball will fall short of the goal, therefore the correct answer is option D.
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Please help me
1. Rank the following items from MOST
inertia to LEAST inertia: Chick Fil A
Biscuit, Feather, Elephant, a 1st grader.
Answer:firt answer corrcect who answerd
Explanation:
Feather, Biscuit, a 1st grader, Elephant is order of LEAST inertia to MOST inertia.
What is inertia?
Inertia is the resistance of an object to any change in motion. Inertia is proportional the mass of the object: in fact, as we experience in common situations, the larger the mass of an object, the more difficult it is to change its motion.
Inertia of an object is its inherited property. It is the measure of its mass. It is clear that the inertia of an object depends directly on its mass. Mass of an object is the amount of matter contained in it. It is same at every location.
Given that in the case four thing Biscuit, Feather, Elephant, a 1st grader out of which Feather, Biscuit, a 1st grader, Elephant is order of LEAST inertia to MOST inertia.
Feather, Biscuit, a 1st grader, Elephant is order of LEAST inertia to MOST inertia.
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Where is mercury naturally found?
wellll that would be in earth crust
Answer:
in space
Explanation:
its a planet
A 80.0kg football player running at 12.5 m/s North runs into a 120.kg player running South. The 120.kg player grabs the other one so they move together at -4.50m/s. What was the velocity of the 120.kg player?
Answer:
p=-540kg•m/s
Explanation:
because I used a calc
2. The Himalayas in central Asia are the tallest mountains in the world. But fossils of seashells can be found high in these mountains, far from any ocean.
How do you think they got there?
Answer:
The sea level could have been much higher in the past.
Explanation:
The tectonic plates shifted and the mountain rose from there.
They are trapped throughout the rock whereas the seashells have been on the floor of a modest seafloor.
These same containers dropped down on the base of the silt level or sheet, as well as those layering finally became rock.Few more million generations previously, the Indian civilization or the subcontinent crashed well with the continents of Asia, making the Himalayan mountains rock which thus previously were such a sea level.
Thus the above response is appropriate.
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a hypothesis is
a- an experiment
b - a question
c - an educated guess ( an ' inference ;)
d - a conclusion
Answer:
D a conclusion
Explanation:
The definition of hypothesis is a supposition or proposed explanation made on the basis of limited evidence as a starting point for further investigation
Q7 Describe two types of atomic change that produce electromagnetic
waves.
scientific findings that prove the strong nuclear force exsist
Answer: The strong nuclear force is one of the four fundamental forces in nature; the other three are gravity, electromagnetism and the weak force. As its name implies, the strong force is the strongest force of the four. It is responsible for binding together the fundamental particles of matter to form larger particles
A piece of copper with a volume of 100cm3 has a mass of 890 g. Explain how you could use this information to find out how much mass would be in 13cm3 of copper.
plz help this q. is due today
Answer:
115.7g
Explanation:
Given parameters:
Volume of copper = 100cm³
Mass of copper = 890g
Unknown:
Mass of 13cm³ copper = ?
Solution:
We know that the two materials are both made up of copper. Since we know the mass and volume of the first one, let us solve for the density. Using the density of the first one, we can determine the mass of the second one by the given volume.
Density is an intrinsic property of matter. It has the same value for every given substance.
It is expressed as mass per volume of a substance;
Density = [tex]\frac{mass}{volume}[/tex]
Input the parameters and solve;
Density = [tex]\frac{890}{100}[/tex] = 8.9g/cm³
Now to find the mass of the 13cm³ copper;
Mass = density x volume
Mass = 8.9 x 13 = 115.7g
At $0.095/kwh, what does it cost to leave a 25 w porch light on day and night for a year?
Answer:
It will cost $20.81
Explanation:
Cost of Electricity
The rate of the cost of electricity is usually expressed in $/KWH because the consumption of electricity is measured in Kilowatts-hour.
If a 25W porch light is on day and night for a full year, the electricity consumption is:
25W*24 H/Day*365 Day/year* 1 year=219,000 WH
converting to KWH: 219,000 WH = 219,000 /1000 KWH = 219 KWH
The rate is $0.095/KWH, thus:
The cost of electricity is 219 KWH*$0.095/KWH= $20.81
It will cost $20.81
