The symbol that represents the isotope that has a mass number of 238, and an atomic number of 92 is 238 subscript 92 upper u.
What is an isotope?Isotopes are any of two or more forms of an element where the atoms have the same number of protons, but a different number of neutrons within their nuclei.
This means that isotopes possess different mass numbers but the same atomic number.
According to this question, the mass number of an isotope of uranium is 238, and its atomic number is 92. This means that the symbol of this isotope is as follows: 238/92 U.
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Answer:
B. [tex]\frac{238}{92}[/tex] U
Explanation:
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What types of galaxies are these?
Answer:
the first one looks like a spiral galixy
the 2nd one looks like a lenticular galixy ?? (im pretty sure but not 100%)
the 3rd one looks like a elliptical galixy
Explanation:
Answer:
1. Spiral
2. Not sure but i think its irregular.
3. Elliptical
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A uniform metal bar 100cm long balances at 20cm mark when a mass of 1.5kg is attached at 0cm mark calculate the weight of the bar (take g=10n/kg)
Answer:
1.6 ml
Explanation:
The boom hoisting sheave must have pitch diameters of no less than.
Answer:
18 times
Explanation:
All sheaves used in the boom hoist reeving system must have a rope pitch diameter of not less than 18 times the nominal diameter of the rope used. The operating design factor for the boom hoist reeving system must be not less than five.
Please help me with theses questions ASAP.
Select the correct answer.
1. Which feature indicates that Mars resides in the inner region of the solar system?
A. It is the coldest planet in the solar system.
B. It has a rocky surface that one could firmly stand on.
C. It contains a faint system of 13 rings.
D. It holds more than 76 satellites.
2. Which two pieces of data indicate that Jupiter resides in the outer region of the solar system?
A. It is primarily composed of hydrogen and helium.
B. It contains one natural satellite, the Moon.
C. It is the hottest planet in the solar system.
D. Its surface gases form into colorful bands.
E. It has a metal surface upon which one can stand.
3.Which statement accurately describes a similarity between Earth and Venus?
A. Both planets have an atmosphere primarily composed of oxygen.
B. Both planets show evidence of volcanic activity.
C. Both planets have retrograde rotation (clockwise, as viewed from above).
D. Both planets contain liquid water at their surface
4. Sort the sentences based on whether the attributes they describe belong to planets or an object that isn’t a planet.
A. The object orbits the sun.
B. The object is a satelite
C. The regions surrounding the object are free from debris.
D. The object is triangular in shape.
5. Match each attribute to the appropriate planet.
Venus
Jupiter
Earth
Mercury
densest planet in the solar system
hottest planet in the solar system
largest planet in the solar system
smallest planet in the solar system
What was the most impactful thing you took away from yesterdays event?
GIVE ME AN EXAMPLE OF BEING NERVOUS
Answer:
BEFORE A ROLLER COASTER
Explanation:
If a brick has a density of 3.75g/mL and a mass of 20.25g, what is its volume
Answer:
5.4mL
Explanation:
20.25g divided by 3.75g/mL= 5.4mL
QUESTION 1
What is the voltage (V) of a small appliance if the
current (I) is 12 A and the resistance (R) is 10 !?
Answer:
QUESTION 2
What is the resistance (R) if the current (I) is 15 A and
the voltage (V) is 230 V?
Answer:
QUESTION 3
Find the current (I) if the voltage (V) is 230 V and the
resistance (R) is 20 !.
Answer:
QUESTION 4
Find the voltage (V) if the resistance (R) is 25 ! and the
current (I) is 5 A.
Answer:
QUESTION 5
What is the resistance (R) if the current (I) is 25 A and
the voltage (V) is 230 V?
Answer:
QUESTION 6
Find the current (I) if the voltage (V) is 230 V and the
resistance (R) is 50 !.
Answer:
QUESTION 7
Find the voltage (V) if the resistance (R) is 35 ! and the
current (I) is 4 A.
Answer:
QUESTION 8
What is the resistance (R) if the current (I) is 15 A and
the voltage (V) is 24 V?
Answer:
check the attachments for the solution
Electromagnetic radiation includes only visible light waves.
true or false
The entire electromagnetic spectrum, from the lowest to the highest frequency (longest to shortest wavelength), includes all radio waves (e.g., commercial radio and television, microwaves, radar), infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays.
False, There is other things aswell
(ii) The ball has a time of flight of 3.5s before landing The green is a vertical
distance of 7.5 m above the point at which the ball was hit, as shown. The green
is about seventy metres away from where the ball is hít.
flight of ball
green
ball hit at this point
17.5m
7 Om
Deduce whether, if air resistance is ignored, the ball could land on the green
after a flight time of 3,5s.
If air resistance is ignored, the ball could land on the green after a flight time of 3.5s.
Vertical velocity of the ball
The vertical velocity of the ball is calculated as follows;
[tex]h = v_yt - \frac{1}{2} gt^2\\\\7.5 = (3.5)v_y - \frac{1}{2}(9.8)(3.5)^2\\\\ 7.5 = 3.5v_y - 60.025\\\\3.5v_y = 67.525\\\\v_y = 19.29 \ m/s[/tex]
Horizontal velocity of the ballX = Vxt
Vx = (X)/t
Vx = (70)/3.5
Vx = 20 m/s
Resultant initial velocityv = √(Vy² + Vx²)
v = √(19.29² + 20²)
v = 27.79 m/s
Angle of projectiontanθ = (Vy)/(Vx)
tanθ = (19.29)/(20)
tanθ = 0.9645
θ = 43.96⁰
check if time of flight will be equal to 3.5 s or moreThe time of flight is calculated as follows;
[tex]T = \frac{2u \times sin(\theta)}{g} \\\\T = \frac{2 \times 27.79 \times sin(43.96)}{9.8} \\\\T = 3.9 \ s[/tex]
Check if the range of ball will 70 m or moreX = VxT
X = 20 x 3.9
X = 78 m
The ball will land on green which is at 70 m after 3.5s.
Thus, if air resistance is ignored, the ball could land on the green after a flight time of 3.5s.
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Do the data support or refute the hypothesis? be sure to explain your answer and include how the variables changed in the experiment.
Do the data support or refute the hypothesis, normally, the data for the first part of the experiment support the first hypothesis.
What is a hypothesis test?Hypothesis testing refers to the formal procedures used by statisticians to accept or reject these hypotheses. When trying to make decisions, it is convenient to formulate assumptions or conjectures about the populations of interest, which consist of considerations about their parameters.
As a result of this, we can see that from the complete text, there is a set of data which is used to show the force that is applied to a cart that causes the acceleration of the cart to increase which supports Newton's second law.
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Answer:
The data support the hypothesis. As the number of half-lives increased, the number of radioactive atoms decreased. With each half-life, approximately half of the radioactive atoms in a sample decayed to a stable isotope.
Explanation:
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Four resistors (67 ohm, 83 ohm, 433 ohm, and 309 ohm in that order) are connected in series to a 7.92 V battery of negligible internal resistance. What is the voltage difference across the second resistor
Answer:
.737 v
Explanation:
Since they are in series....they all have the same current running through them.....find the total resistance to calculate the current:
R = 67 + 83 + 433 + 309 = 892 ohm
V/R = current = 7.92 / 892 = 8.87 mAmps
Now the voltage across ecah resistor is I R
for the second one 8.87 ma * 83 ohm = V = .737 V
Why is the moon’s force of gravity less than that of the earth?
Why is the moon’s force of gravity less than that of the earth?
Answer:-Since the moon has a smaller mass than the earth, the moon has less gravity than the earth. Gravity is related to mass.
Larger mass = larger gravity
Smaller mass = lesser gravity
Moon has small mass, therefore less gravity.
Vhich type of reaction is modeled by this chemical equation?
PLi + CaCl2 - 2LICI + Ca
Answer:
Double-replacement
Explanation:
2Li + CaCl2 → 2LiCl + Ca O
D. Double-replacement
Which statement describes one of the main principles of Dalton's atomic theory? Elements of the same atom are identical. O Atoms of the same element are different. O Elements of the same atom are different. Atoms of the same element are identical.
Dalton's atomic theory is related to the characteristics of atom. The statement describes one of the main principles of Dalton's atomic theory is atoms of same element are identical.
What is Dalton's atomic theory?The Dalton's theory states that All matter is composed of extremely small particles called atoms and Atoms of a given element are identical in size, mass, and other properties. Atoms of different element are different.
Hence, the statement describes one of the main principles of Dalton's atomic theory is atoms of same element are identical.
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Food must often stay warm prior to being served but also not be damaged by the heating process. Which of these components of the electromagnetic spectrum would be high enough in associated energy to warm food without having ionizing impacts on the components of the food itself? Select ALL that apply.
The electromagnetic spectrum which is high enough to warm food without having ionizing impacts include:
MicrowavesInfraredWhat is Ionization?This involves an atom or a molecule gaining or losing electrons to form charged ion.
The electromagnetic spectrum wit long wavelengths will have enough energy to warm it without ionizing impacts and they are mentioned above.
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The following equation, N2 + 3 H2 —>2 NH3 ,describes a
(1) physical change
(3) mixture
(2) chemical change
(4) element
A uniform magnetic field b is perpendicular to the plane of a circular loop
A uniform magnetic field is perpendicular to the plane of a circular loop. The rate must the magnitude of change to induce a 10 A current in the loop.
What is uniform magnetic field?The magnetic field which doesn't change with respect to time is called the uniform magnetic field.
The resistance of the loop is related to the length of the wire as
R=ρ L/ A
Diameter of wire is 10 cm formed from wire of diameter 2.5 mm and resistivity is 1.69×10⁻⁸ Ω⋅m.
Substituting the values into the above equation, we get
R = {(1.69×10−8Ω⋅m) × π(0.10m)} / {π(2.5×10−3m)2/4}
R =1.1×10−3Ω
Current is related to emf as
i=∣ε∣/R
=∣dΦB/dt∣ / R
=(πl2/R) ∣ dB/dt ∣.
Substituting the given values from the question, we have rate of change of magnetic field
∣dB / dt∣ = πr2iR
∣dB / dt∣ = π(0.05m)2(10A)(1.1×10−3Ω)
∣dB / dt∣ =1.4T/s
Therefore, the rate must the magnitude of change to induce a 10 A current in the loop is 1.4T/s.
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How much heat energy is required to raise the temperature of 1 kilogram of steel by 10°C?
from
∆H=MC∆T
but M=1Kg=1000g
∆T=10°C
C=0.466J/g°C
∆H=(1000×0.466×10)Joule
=4660J
explanation
When heat energy is added to a substance, the temperature will change by a certain amount. The relationship between heat energy and temperature is different for every material, and the specific heat is a value that describes how they relate.
heat energy = (mass of substance)(specific heat)(change in temperature)
Q = mc∆T
Q = heat energy (Joules, J)
m = mass of a substance (kg)
c = specific heat (units J/kg∙K)
∆ is a symbol meaning "the change in"
∆T = change in temperature (Kelvins, K
What is the momentum of a 8kg ball rolling at 25 m/s?
Answer:
200
Explanation:
P = M x V
P = 8 x 25
P = 200
Question 25 of 25
How do changes in light wavelengths support the most widely accepted
ideas about the universe?
O A. Galaxies are moving away from Earth, as shown by the shift of
their light toward the red end of the spectrum.
B. Galaxies are moving toward Earth, as shown by the shift of their
light toward the blue end of the spectrum.
OC. Galaxies are moving away from Earth, as shown by the shift of
their light toward the blue end of the spectrum.
OD. Galaxies are moving toward Earth, as shown by the shift of their
light toward the red end of the spectrum.
The changes in light wavelengths support the most widely accepted
ideas about the universe is Light from other galaxies shifts toward the red end of the spectrum, which shows that the galaxies are moving away from Earth. The correct option is A.
Universe is the whole cosmic system of matter and energy. The Earth, the Sun, the Moon, the planets, the stars along with the ,dust , gases, rocks forms the universe.
As the universe is expanding more and more, the galaxies are shifting their way apart.
According to Doppler's Effect, wavelength and frequency of a wave will changes with respect to an observer If the observer moves closer, the spectrum will shift towards blue end and if it moves away, the spectrum will shift towards the red end.
When spectrums of distant galaxies were observed to be shifting towards red light, also known as Red shifting. This shows that the Big Bang theory is true that universe is expanding.
Thus, the correct option is A.
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A figure skater goes into a spin with her arms outstretched. She then pulls her arms in against her body. If she is initially rotating at 2rev / s , what is her final rotational speed? Assume that by pulling in her arms she reduces her rotational inertia from 2kg - m ^ 2 to 1.5kg - m ^ 2
For a figure skater goes into a spin with her arms outstretched. She then pulls her arms against her body. If she is initially rotating at 2rev / s is mathematically given as
Wf= 6rev / s
what is her final rotational speed?
Generally, the equation for the conservation angular momentum is mathematically given as
I1Wf=I2Wf
2kg - m ^ 2 X 2rev / s = 1.5kg - m ^ 2 X W2
Wf= 2/1.5(2)
Wf= 6rev / s
In conclusion, her final rotational speed is
Wf= 6rev / s
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Nancy ran a distance of 5km in 30 minutes. What is her speed in meters(m) per hour)h)
The speed of Nancy who ran a distance of 5 km in 30 minutes is 10000 meters(m) per hour(h).
What is the rate of speed?
The rate of speed is the rate at which the total distance is travelled in the time taken. Rate of speed can be given as,
[tex]s=\dfrac{d}{t}[/tex]
Here, (d) is the distance travelled by the object and (t) is the time taken but the object to cover that distance.
Nancy ran a distance of 5 km in 30 minutes. There are 60 minutes in one hour. Thus, the time in hour for which Nancy ran is,
[tex]t=\dfrac{30}{60}\\t=0.5\rm\; hr[/tex]
The meters in 5 kilometers is,
[tex]d=5\times1000\\d=5000\rm\; m[/tex]
She ran 5000 kilometers in 0.5 hours. Thus, the speed of her is,
[tex]s=\dfrac{5000}{0.5}\\s=10000\rm\; km/hr[/tex]
Thus, the speed of Nancy who ran a distance of 5 km in 30 minutes is 10000 meters(m) per hour(h).
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A gravitational field is generated by any object that has–
Answer:
Mass.
Explanation:
A car has a kinetic energy of 4.32 x 10J when traveling at a speed of 23 m/s. What is its mass?
Answer
0.163 kg
Explanation:
[tex]\sf Kinetic \ Energy = \dfrac{1}{2} \ x \ mass \ x \ velocity^2[/tex]
Here we are provided with:
1) Kinetic Energy = 4.32 x 10 Joules ≈ 43.2 Joules
2) Speed/Velocity = 23 m/s
Now, solve for mass:
[tex]\rightarrow \sf \dfrac{1}{2} \ x \ mass \ x \ velocity^2 = Kinetic \ Energy[/tex]
[tex]\rightarrow \sf \dfrac{1}{2} \ x \ mass \ x \ (23)^2 =43.2[/tex]
[tex]\rightarrow \sf mass= \dfrac{43.2 (2)}{23^2}[/tex]
[tex]\rightarrow \sf mass= 0.163 \ kg[/tex]
Can someone please answer this, ill give you brainliest Would be very appreciated.
What property/properties of water allowed the water to stick to the penny?
Solution's:
Cohesion.Surface Tension.Explanation:
By these properties, the water molecules gets attracted to the other molecules. Hence, this makes the water get stick to the penny.
Answer:
cohesion and surface tension
Explanation:
The properties of cohesion as well as surface tension, possessed by water, made the water stick to the penny.
An object attached to one end of a spring makes 20 vibrations in 10 seconds. Its angular frequency is: 0. 79 rad/s 1. 57 rad/s 2. 0 rad/s 6. 3 rad/s 12. 6 rad/s
Angular frequency in radian per second for 20 vibrations in 10 seconds is 12.6 rad/s
What is Angular frequency?Angular frequency is the number of vibrations in radian per second.
The total number of vibrations n is 20 and the time taken for these vibrations is 10 s
The frequency of the vibrations will be
f = 20 / 10 = 2 Hz
Angular frequency is related to the frequency as
ω = 2πf
ω=2π × 2
ω = 12.6 rad/s
Thus, the angular frequency is 12.6 rad/s.
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The Renaissance astronomer who wrote the pioneering book that suggested the Earth probably orbits the Sun (instead of the other way around) was: Group of answer choices Eratosthenes Copernicus Newton Ptolemy
The Renaissance astronomer who wrote the pioneering book that suggested the Earth probably orbits the Sun was Copernicus.
Who is an astronaut?An astronaut observes and performs the experiments based on the universe.
The astronomer observes the universe and its components closely using telescope being on the Earth. While the astronaut goes into space to look in closely.
The astronomer who gave the observation that Earth is orbiting around the Sun was Nicolaus Copernicus.
Thus, the correct option is Copernicus.
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You are still able to hear sounds coming from a room when the door is open only a tiny crack due to…?
Answer:
Sound waves are able to go throught some objects.
Explanation:
1150 kg car is on a 8.70 degree hill. What’s the x component of the normal force
Answer:
The x - component of the normal force is equal to 1706.45 N.
Explanation:
To solve the problem, and since there is no additional information, we can safely assume that the x-axis is parallalel to the hill surface and the y-axis is perpendicular to the x-axis. Knowing that, we can calculate the components of the normal force (or weight for this case), using the following formulas:
[tex]N
x
=W∗Sin(α)=mg∗Sin(α)[/tex]
[tex]N
y
=W∗Cos(α)=mg∗Cos(α)[/tex]
Now, using the given information, we have:
[tex]mass=m=1150Kg[/tex]
[tex]a=8.70[/tex]
[tex]g=9.81 \frac{m}{ {s}^{2} } [/tex]
Calculating, we have:
[tex]N_{x}=mg*Sin(\alpha)[/tex]
[tex] \: \: \: \: \: \: \: \: \: N_{x}=1150Kg*9.81\frac{m}{s^{2}}*Sin(8.70\°)[/tex]
[tex]N
x =11281.5
s
2
Kg.m
∗Sin(8.70\°) = \\ \\ 1706.45
s
2
Kg.m
=1706.45.23N[/tex]
Hence, we have that the x-component of the normal force is equal to 1706.45 N.
Answer:
zero
Explanation:
fx=
Which object represents a negatively charged particle? which object represents a positively charged molecule? which object represents an uncharged molecule? which object will not move when in an electric field?
The answers to your questions are as written below:
The objects that represents a negatively charged particle is : Image B The object that represents a positively charged molecule is : Image A The object that represents an uncharged molecule is : Image C The object the will not move when in an electric fied is : Image C Different types of charges moleculesA negatively charged molecule move inwards when placed in an electric field while positively charged molecule placed in a electric field will move outwards the electric field.
A neutral/uncharged molecule will remains still when placd in an elctric field due to the absence of charges.
Hence we can concude that the answers to your questions are as listed above.
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attached below is the missing image
