Answer:
94
Explanation :
Of these 118 elements, 94 occur naturally on Earth. Six of these occur in extreme trace quantities: technetium, atomic number 43; promethium, number 61; astatine, number 85; francium, number 87; neptunium, number 93; and plutonium, number 94.
source: Wikipedia
Calculating A cyclist's speed changes from
0 m/s to 15 m/s in 10 seconds. What is the
cyclist's average acceleration?
[tex]\\ \sf\longmapsto Acceleration=\dfrac{v-u}{t}[/tex]
[tex]\\ \sf\longmapsto Acceleration=\dfrac{15-0}{10}[/tex]
[tex]\\ \sf\longmapsto Acceleration=\dfrac{15}{10}[/tex]
[tex]\\ \sf\longmapsto Acceleration=1.5m/s^2[/tex]
Average acceleration is calculated using the following formula: Average Acceleration = Change in Velocity/ Time.
Acceleration is a fundamental concept in physics that measures the rate of change of an object's velocity with respect to time.
It quantifies how quickly an object's speed or direction of motion is changing.
Acceleration = Final velocity − Initial velocity/ Time
= 15 − 0/ 10
= 15/ 10
= 1.5 m/s²
Therefore, The cyclist's average acceleration is 1.5 m/s²
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What is the potential energy of a rock that weighs 10.0 kg and is sitting on top of a hill 100 meters high?l
Answer:
9800 J
Explanation:
P.E = mgh
m = massg = gravitational accelerationh = heightP.E = (10.0)(9.8)(100) = 9800 J
a system absorbs 35J of heat and in the process it does 11J of work if the initial internal energy is 205J a,what is the final internal energy b,the system follows a different thermodynamic path to the same final state and does 15J of work, what is the heat transferred ?
Answer:
[tex]a)uf = 205 + 35 - 11 \\ = 240 - 11 \\ = 229j \\ b)q(heat \: transferd) = 229 - 205 - 11 \\ = 24 - 11 \\ = 13j \\ thank \: you[/tex]
The heat transferred is
a) u f = 205+35-11
=240-11
= 229 j
b) q (heat transferred ) = 223-205-11
= 24-11
= 13 j
What is the difference between course and process in thermodynamics?
While a thermodynamic gadget passes thru an exchange in the state, a succession of states exceeded could be termed as a course of the device or direction of an alternate country. If the route of change of kingdom is completely distinctive, route of alternate of the nation may be termed as thermodynamic manner.
The technique is described via a direction, which is the non-stop collection of consecutive states via which the machine passes, consisting of the initial nation, the intermediate states, and the very last state. The process has a course along the course.
An asset whose price would not depend upon the course taken to attain that unique price is thought to as kingdom capabilities or point features. In contrast, those capabilities which do depend upon the direction from points are referred to as course features.
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Wich of the following quantities is not a vector
Answer:
A vector has magnitude (size) and direction. The length of the line shows its magnitude and the arrowhead points in the direction. We can add two vectors by joining them head-to-tail:
Explanation:
If I'm cold and want to warm up with an electric heater, which energy would I need in order to make the heater work?
a=light energy
b=electric energy
c=potential energy
d=mechanical energy
The answer would be B.) Electric Energy
Answer:
b.electric energy
we need electric energy to make the heater work.
Which is the cause of the suns magnetic properties ?
A) upward movement or super heated gases in the convection zone
B) uneven churning of plasma
C) rapid spinning of metals in the core
D) uniform clockwise rotation of charger particles
Answer:
Q:
What characteristic is shared by sunspots, solar flares, and coronal mass ejections? Select the two correct responses.
A:
They tend to occur during active periods of the solar cycle. & They are caused by outward fluctuations of the sun's magnetic field.
Q:Drag each item to the correct location.
A: sunspot: cooler area on suns surface where the magnettic field emerges
solar flare: intense burst of radiation coming from the rapid release of magnetic energy
coronal mass ejection: large bubble of plasma from the rapid release of magnetic energy
Q: Which is the cause of the sun's magnetic properties?
A: uneven churning of plasma
Explanation:
took quick check
good luck yall
The uneven churning of plasma is the cause of the sun's magnetic properties, therefore the correct answer is option B.
What is a magnetic field?A magnetic field could be understood as an area around a magnet, magnetic material, or an electric charge in which magnetic force is exerted.
For a simple bar magnet, N-pole and S-pole are the points on a magnet that have the strongest magnetic field. The magnetic field originates from the north pole and terminates in the south pole of a magnet.
The positively charged ions and negatively charged electrons that make up the plasma of the Sun move around a lot due to its high temperatures. Multiple intricate magnetic fields that twist and turn are produced by the moving plasma. A magnetic field is produced by the extremely hot plasma that escapes from the Sun as the solar wind.
Thus, The sun's magnetic properties are caused by uneven plasma churning, so option B is the correct answer.
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Read the PDF to help.
Explanation:
The answer is magnetic north pole
what is 342 m/s in kilometers per hour?
Answer: 1231.2 km/h
Explanation: 342 x 3.6 ( because 1 m/s equal 3.6 km/h)
Which equation correctly relates mechanical energy, thermal energy, and total
energy when there is friction present in the system?
A. Ethermal
Ethermal
=
ME
B. Ethermal = Etotal - ME
C. Ethermal = ME - Etotal
D. Ethermal = Etotal + ME
Answer:
B
This is because frictional energy is similar to thermal energy in a system. Therefore the thermal energy produced is equal to
A cup of sugar has a volume of 237ml . What is the mass of the cop of sugar if the density of sugar is 1.59g/ml?
Answer:
v=237ml m=? density(rho) = 1.59 g/ml
density = mass/volum
mass= (density)(volume)
m=(1.59)(237)
m=376.83g
fuse wire is alloy of copper and alluminium? true or false
[tex]\huge\mathfrak\green{True}[/tex]
what is meant by an acceleration of negative 2metre per second square
means that a body is in motion, and its velocity is measured in meters per second. And, that velocity is increasing by two meters per second, every second.
........................
Why heavy vehicles usually have low velocity but possess high kinetic energy
The kinetic energy is high because, the mass of the object is large and thus has a great momentum and its velocity low because it has a large mass.
We know that kinetic energy of an object K = 1/2mv² where m = mass of the object and v = velocity of the object and its momentum, p = mv
For a given value of kinetic energy, the mass of the object m = 2K/v². This implies that m ∝ 1/v².
So, as the mass of the object increases, its velocity decreases.
So. an object with large mass has low velocity while an object with small mass has high velocity.
Also, the kinetic energy, K = 1/2mv². So, K ∝ mv². So, if m is large and v is small, the product mv² is large and thus K = 1/2mv² is high.
So, the kinetic energy of heavy vehicles is high because, the mass of the object is large and thus has a great momentum and its velocity low because it has a large mass.
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18. A man weighing 1000 N runs up some stairs.
rising a vertical height of 5 m in 10 seconds.
a) What power does he develop?
Answer:
energy power
Explanation:
energy power
A car of 900 kg mass is moving at the velocity of 60 km/hr. It is
brought into rest at 50 metre distance by applying brake. Now,
calculate the force required to stop the car. [Ans: 2500 N] class 9
Answer:
2500N.
Explanation:
SEE THE IMAGE FOR SOLUTION
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HAVE A GREAT DAY
Explanation:
Force = mass × acceleration
Mass = 900kg
Acceleration = velocity ÷ time
Velocity = 60km/hr = 60 × 1000 ÷ 3600
Velocity = 60000 ÷ 3600
Velocity = 16.67m/s
To get the time
Velocity = Distance ÷ time
16.67 = 50 ÷ time
Cross multiply
16.67 × time = 50
time = 50 ÷ 16.67
time = 3 seconds
Acceleration = 16.67 ÷ 3
Acceleration = 5.56m/s²
Therefore, Force = 900 × 5.56
Force = 5004 Newton
In science, work is defined as:
force multiplied by the distance moved in a direction perpendicular to the force.
force multiplied by the distance moved in a direction parallel to the force.
the mass of an object multiplied by its acceleration.
the mass of an object multiplied by the force required to move it.
Answer:
Yes
Explanation: Thats exactly how it goes
7. A train is traveling with an initial velocity of 20.1 m/sec. If the brakes can apply a maximum
acceleration of -0.0500 m/sec”, how long will it take the train to stop?
The time that takes for the train that is traveling with an initial velocity of 20.1 m/s to stop is 402 seconds.
The time that will take for the train to stop can be calculated with the following kinematic equation:
[tex] v_{f} = v_{i} + at [/tex] (1)
Where:
[tex] v_{f}[/tex]: is the final velocity = 0 (when it stops)
[tex] v_{i}[/tex]: is the intial velocity = 20.1 m/s
a: is the acceleration = -0.0500 m/s²
t: is the time =?
By solving equation (1) for t, we have:
[tex] t = \frac{v_{f} - v_{i}}{a} = \frac{0 - 20.1 m/s}{-0.0500 m/s^{2}} = 402 s [/tex]
Therefore, it will take 402 seconds for the train to stop.
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What happens as a result of changing the number of protons in an atom?
O The atom becomes an ion of the same element
O The atom becomes an isotope of the same element.
O The atom becomes a different element.
O Nothing changes.
Answer:
the atom becomes an isotope of the same element
Explanation:
isotopes are elements with the same atomic number but different mass number
In which condition work up done opposes to frictional force
Answer:
When any work is done against friction then work done opposes to frictional force.
why is the base of the kettle made of plastic not metal?
Answer:
The metal base and the plastic housing are sealed together to complete the tea kettle body.
Explanation:
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which energy is found in water store in dam?
a.kinetic energy
b.potential energy
c.chemical energy
d.both a and b
Answer:
d. both a and b
Answer:
potential energy
4 kg of water was
added to a 1.2 kg iron
boiler. How much
heat must be
supplied to the boiler
to heat the water in it
from 16 °C to 90 °C
Given :
Mass =5kg
T
1
=20
∘
C,T
2
=100
∘
C
ΔT=100−20=80
∘
C
Q=m×C×ΔT
where C= specific heat capacity of water
=4200J/(kgK)
Q=5×4200×80
=1680000 Joule.
=1680KJ
Speed is measured by what SI units?
Answer:
Hi, There! The Correct Answer is Below!
unit of speed is the meter per second (m/s
Explanation:
Some Extra Information! :)
Speed is a measure of how fast something is travelling. The most common units of speed are metres per second (m/s), kilometres per hour (km/h) and miles per hour (mph). In a typical car journey the speed of the car will change. The distance divided by the time will calculate the average speed of the car.
___________________________________________________________
-DarkSpirit-
why cannot an athlete stop instantaneously when he reaches the end in after the race
Explanation:
because his lower body is in inertia of motion.
Hope it helps
i need help asap!!!!!!!!!!!!
Answer:
B. the boy is not lifting more than 1m up, as the question states
What does Δx stand for? What SI units are used to measure it?
Answer:
Displacement. Units of measure metre (m)
Explanation:
Delta x Δx stands for displacement, or change in position.
Write the importance of international bureau of weight and measures in the country
Answer:
International Bureau of Weights and Measures (BIPM) is an international organization founded to bring about the unification of measurement systems, to establish and preserve fundamental international standards and prototypes, to verify national standards, and to determine fundamental physical constants. The bureau was established by a convention signed in Paris on May 20, 1875, effective January 1876. In 1921 a modified convention was signed. The convention provides for a General Conference that meets every four years to consider required improvements or modifications in standards. An International Committee of Weights and Measures, composed of 18 scientists elected by the conference, meets annually to monitor worldwide uniformity in units of measure.
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fast help me I need help
Answer:
Pascal
it is derived of force and area
Answer:
none of the above
Explanation:
All of them are derived units
Convergent plate boundaries are when plates
collide
move past each other
move apart
Explanation:
Collide is your answer
have a good day.
when a burning stick of increase is moved fast in a circle a circle of red light is seen.
Answer:
The impression of the image on the retina lasts for about 1/16th of a second after the removal of the object. If a burning stick of incense is revolved at a rate of more than sixteen revolutions per second, we see a circle of red light due to persistence of vision.
Explanation: