Answer:
B vacuoles
Explanation:
Which of the following distinguishes the isotope uranium-238 from the isotope uranium-235?
A.number of neutrons in the nucleus
B.location on the periodic table
C.amount of negative charge
D.ability to form ions
Answer: A
Explanation:
Isotopes of different elements differ by the number of neutrons inside the nucleus.
The isotope of uranium-238 is different from the isotope uranium-235 by number of neutrons in the nucleus.
What is isotope?Isotopes are two or more types of atoms that have the same atomic number and position in the periodic table, and that differ in nucleon numbers due to different numbers of neutrons in their nuclei.
What is uranium-238?Uranium-238 is the most common isotope of uranium found in nature, with a relative abundance of 99%. It can be used for radiation shielding or as projectiles in armor-piercing weapons.
What is uranium-235?Uranium-235 is the only naturally occurring fissile isotope, which makes it widely used in nuclear power plants and nuclear weapons.
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What is TRUE about the use of drawings at a crime scene?
O A. Drawings are no longer used because photography is more precise.
OB. Only when a camera is not immediately available should a sketch be made.
O c.
It is common practice for investigators to make a sketch of a crime scene.
OD. Investigators are trained in how to make a quality finished sketch of a scene.
Answer:
A. Drawings are no longer used because photography is more precise.
Explanation:
It is common practice for investigators to make a sketch of a crime scene.
Creating sketches of crime scenes is a common practice among investigators, as it provides valuable visual documentation that complements photographs and written notes. While photography is an important tool for capturing detailed and precise information, sketches offer unique advantages that contribute to the overall understanding of the crime scene.
Sketches can provide a clear and organized representation of the spatial relationships, distances, and dimensions within the crime scene. They can accurately depict the layout of the area, the position of evidence, the location of key objects, and other relevant details that may not be fully captured by photographs alone.
Additionally, sketches allow investigators to emphasize specific features or elements that are essential to the case. This can aid in explaining the sequence of events, the movement of individuals or objects, and other dynamic aspects of the crime scene.
While digital photography is widely used today, sketches remain valuable for scenarios where a camera may not immediately be available, when capturing certain angles or perspectives is challenging, or when highlighting specific details is necessary.
Investigators are trained in creating accurate and detailed sketches that adhere to professional standards. This includes ensuring accurate measurements, using appropriate scale ratios, labeling key features, and maintaining object proportions. Sketched crime scene diagrams are often included in official investigative reports and court proceedings to provide a comprehensive visual representation of the crime scene, enhancing the communication of information among investigators, legal professionals, and jurors.
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After a neutral object loses 2 electrons, it will have a
net charge of
A) -2 elementary charges
B) +2 elementary charges
C) -3.2 x 10-19 elementary charge
D) +3.2 x 10-19 elementary charge
Answer:
the measured charge will be -2 elementary charges.
Explanation:
Kinetic energy and mass are ____ proportional.
Answer:
directly
Explanation:
Answer: Directly
Explanation:
How much work is done by a weightlifter who uses a force of 350 N to lift a weight 1.5 meters?
Answer:
525 j
Explanation:
Work = force * distance
350 N * 1.5 m =
Suppose that you wanted to travel to the next closest star to Earth. Proxima Centauri is the closest star to our solar system at a distance of 4.3 light years (40,208,000,000,000 km). Knowing that the space shuttle’s typical speed is 28,000 km/hr, how long would it take you to get there?
Answer:
1 436 000 000 hrs 163 814 .7 years
Explanation:
40208000000000 km / 28000 km/hr =
The Space shuttle's speed is 28,000 km/hr, and the time it will take to get you there is 1436000000 hours or 163814.7 years.
What is Proxima Centauri?Although Proxima Centauri cannot be seen normally with eyes, it is one of the most famous stars in the sky. This is because it is a member of the Alpha Centauri star system, which is the nearest stellar system to our sun and is home to three known stars.
Proxima, with a distance of 4.22 light-years from our sun, is thought to be the star in Alpha Centauri that is nearest to our sun of the three. For Proxima, astronomers have so far found two planets. It also produces large solar flares, and a strange radio signal may come from it.
According to the question :
The given distance is 4.3 light-years or,
Distance = 40,208,000,000,000 km
Given speed is 28,000 km/hr.
So the time it will take to get you up there is: Distance/speed
Time = 40,208,000,000,000 km/28,000 km/hr
Time = 1436000000 hours or,
Time = 163814.7 years
Hence, the time taken to get you there will be 163814.7 years.
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The spacecraft Magellan's fifth orbit around the Venus was at a mean altitude of 3.01 x 105 m. What was its period? Mean radius of Venus = 6.05 x 106 m. Mass of Venus = 4.87 x 1024 kg.
The period of the orbit of the spacecraft around Venus is 5187.3 seconds.
What did the period of motion of a an object?The period, T, of an object in circular motion is the time taken for one complete revolution.
The period, T, of the planetary body is given as:
[tex]T = 2\pi\sqrt{\frac{r^{3}}{Gm}}[/tex]
where;
r is the radius G is universal gravitational constant = 6.67 × 10^-11 Nm^2/kg^2m is the massSubstituting the values:
[tex]T = 2\pi\sqrt{\frac{(6.05 \times 10^{6})^{3}}{6.67 \times 10^{ - 11} \times 4.87 \times 10^{24}}} = 5187.8s[/tex]
Therefore, the period of the orbit of the spacecraft is 5187.3 seconds.
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As the wavelength of electromagnetic radiation increase
Answer:
the frequency and the radiation of radiation decreases.
Explanation:
1. What conclusions can you draw about how the sum of forces acting on an object affect its motion?
Answer:
The sum of all the forces acting on an object is the net force or resultant force. If all the forces cancel out, the resultant force is zero, else, the unbalanced force will cause acceleration of the object. Force is a vector and hence has both a direction and magnitude. For example, gravitational force (on earth) acts in downward direction and has a magnitude equal to mass of the object and acceleration due to gravity. Once we know all the forces that are acting on a body, we resolve all of them into components (typically horizontal and vertical) and take summation of forces in each direction. If such forces cancel out (in each direction), the object maintains its state of rest or constant motion. If however, forces do not cancel out, there is a net resultant force on the object that will cause acceleration of the object (as given by Newton's second law of motion).
Explanation:
If the error in the angle is 0.50, the error in sin 90° is
The error in the measurement of sin 90 degrees at the given error in angle is 0.001.
Error in measurementThe error in measurement is obtained from the difference between the actual measurement and the observed measurement.
The error of sin 90 degrees is calculated as follows;
Actual measurement = sin 90 = 1
Observed measurement = sin(90 - 0.5)
Observed measurement = sin(89.5) = 0.999
Error in measurement of sin 90 degreesError in measurement = Actual measurement - Observed measurement Error in measurement = 1 - 0.999
Error in measurement = 0.001
Thus, the error in the measurement of sin 90 degrees at the given error in angle is 0.001.
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Calculate the resistance of 1 km long copper wire of radius 1 mm.
(specific resistance of copper is 1.72 * 10^-8 ohm meter)
Length, l=1 km=1000 m
Radius, r=1 mm=10^−3 m
to find:the resistance.
solution:Specific resistance of copper:
ρ=1.72×10^−8
Area of cross-section:
A=π×r2=3.14×10^−6 m^2
Let the resistance be R.
As we know, R=ρ l/A
On substituting values:
R=1.72×10^−8×10^3/3.14×10^−6
=5.5 ohm
⇒ Resistance of the copper wire, is 5.5 ohm.
5.5 Ω
Explanation:
Given : l = 1 km = 1000 m, r = 1 mm = 10^-3 m,
[tex]a = \pi {r}^{2} [/tex]
[tex]= > 3.14 \times ( {10}^{ - 3} )^{2} \\ = > 3.14 \times {10}^{ - 6} \: {m}^{2} .[/tex]
[tex]specific \: \: resistance \: \: ρ \: \\ = > 1.72 \times {10}^{ - 8} Ω \: m[/tex]
Resistance (R) :-
[tex]R \: = ρ \times \frac{l}{a} \\ \\ = > \frac{(1.72 \times {10}^{ - 8} ) \times 1000}{3.14 \times {10}^{ - 6} } \\ \\ = > 5.5 \: Ω[/tex]
Hope it helps you!!define health psychology
Answer:
"Health psychology is a specialty area that focuses on how biology, psychology, behavior, and social factors influence health and illness."
-Verywell Mind
Hope I helped!
Explanation:
A natural disaster speech
What is longitudinal wave ?
Explanation:
Longitudinal waves are waves in which the vibration of the medium is parallel ("along") to the direction the wave travels and displacement of the medium is in the same (or opposite) direction of the wave propagationPLS HELP MEEEE
1. A large positive charge is placed very far away from a small negative charge. Which of the best explains the interaction between the two charges?
(Standard SPS10 c)
A. An attractive, weak force
B. A repulsion, strong force
C. A repulsive, weak force
D. An attractive, large force
Answer:
A. An attractive, weak force
Explanation:
I got it right
An attractive, weak force best explains the interaction between the two charges. The force between two charges is known as the Columb's force.
What is the charge?When the matter is put in an electromagnetic field, it has an electric charge, which causes it to experience a force. A positive or negative electric charge can exist.
Charges that are similar repel each other, whereas charges that are dissimilar attract each other. The term "neutral" refers to an item that has no net charge.
A large positive charge is placed very far away from a small negative charge. Due to the far distance, the force will be a weak force.
While due to the opposite polarity the charge is attractive in nature.
Hence an attractive, weak force best explains the interaction between the two charges
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In one or two sentences make and justify a claim about two aspects of the picture that illustrate behaviors of light.
We can make the claim that light can be reflected, which is justified by the reflection seen on the water as well as the colors seen in the photo.
How can we tell that light is being reflected?We can claim that light can and is being reflected in this image due to the reflection in the water as well as the colors. As the light traveling in the air collides with the water, it abruptly changes speed, causing a portion of these waves to be reflected back, thus creating a mirror image on the surface of the water. This is also the case with colors, which are caused by a material reflecting all but one wavelength of light.
Therefore, we can confirm that it is possible to make the claim that light can be reflected, which is justified by the reflection seen on the water as well as the colors seen in the photo.
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A cart of mass 4.0 kg is being pulled with a force of 24 N. The cart accelerates at 3.0 m s-2. What is the net force on the cart?
Answer:
waitt in comments... .................
A car with a mass of 1500 kg is traveling at a speed of 30 m/s what force must be applied to stop the car in 3 seconds
Answer:
15 000 N
Explanation:
Newtons Law 2. When a body is acted upon by a force, the time rate of change of its momentum equals the force.
F=ma
a=30m/s / 3s=10m/c²
F=1500kg*10m/c²=15 000 N
what do i ask hmmmm oh i know what is gravity?
Answer:
Gravity is the force that keeps us on our planet.
Explanation:
In space, the more mass you have, the more gravity you have. We all have gravity, however earth overpowers it.
How can a mutation during replication affect the DNA?
The DNA strands are broken.
The DNA strands are continuous.
The DNA strands are identical.
The DNA strands are different.
Answer:
D. The DNA strands are different
Explanation:
K12 and I took the test
Here is proof
A mutation during replication affect the DNA cause the DNA strands are different. hence option D is correct.
What is DNA ?Deoxyribonucleic acid is a polymer composed of two polynucleotide chains that coil around each other to form a double helix. The polymer carries genetic instructions for the origin, functioning, development, and reproduction of all known organisms and viruses. DNA and ribonucleic acid (RNA) are examples of nucleic acids. Nucleic acids, together with proteins, lipids, and complex carbohydrates (polysaccharides), are one of the four basic macromolecule groups necessary for all known forms of life.
Because they are made up of simpler monomeric units called nucleotides, the two DNA strands are known as polynucleotides. Each nucleotide is made up of one of four nitrogen-containing nucleobases (cytosine, guanine [G], adenine [A], or thymine [T]), deoxyribose, and a phosphate group. Covalent bonds link the nucleotides together to form a chain.
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A plane mirror is used to
O A. create light energy.
OB. model wave movements.
OC. separate colors of light.
OD. reflect light.
What is wave motion ?
Explanation:
Literally wave motion is a motion which is like wave .It denotes to transfer of energy and momentum.It is denoted to transfer of matter between two mediums virtually not actually.Astronomers classify galaxies into three basic types: spiral, elliptical, and irregular. If the Sun and Earth were located on the edge of an elliptical galaxy, what would you expect to see when you look up in the sky at night
Most of the night sky would be dark with only a few stars if the solar system were moved on the edge of galaxy.
What we can see at night if sun and earth moved to the edge?If the Sun and Earth were moved on the edge of an elliptical galaxy, we can see most of dark and few stars in the sky at night because stars are present at large number at the center of galaxy and fewer at th edges.
So we can conclude that most of the night sky would be dark with only a few stars if the solar system were moved on the edge of galaxy.
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A 2510 kg car, moving at 23.0 m/s, runs into a car that has a mass of 1750 kg
and is moving at 12.3 m/s in the same direction. The cars stick together after
the collision. Assuming momentum is conserved, what is their final velocity?
A. 18.6 m/s
B. 16.4 m/s
C. 19.3 m/s
D. 21.1 m/s
By conservation of momentum,
(2510 kg) (23.0 m/s) + (1750 kg) (12.3 m/s) = (4260 kg) v
where v is the velocity of the combined cars.
Solve for v :
(4260 kg) v = 79 255 kg•m/s
v ≈ 18.6 m/s
what is 123° in radians
Answer:
2.14675
Explanation:
Formula: 123° × π/180 = 2.147rad
force and ___ work together cause objects to move or to stay in place
Answer:
frictional force
4.0 J of work are performed in stretching a spring with a spring constant of 2500 N/m. How much is the spring stretched?
[tex]energy = elastic \: potential[/tex]
[tex]4 = \frac{1}{2} kx {}^{2} [/tex]
[tex]4 = \frac{1}{2} (2500)x {}^{2} [/tex]
[tex]4 = 1250x {}^{2} [/tex]
[tex]x {}^{2} = \frac{4}{1250} = 0.0032 \: meters[/tex]
[tex]x = \sqrt{0.0032} = 0.05657 \: meters[/tex]
If 1.5 kilograms of water is to be heated from 20.0°C to 75°C to make a cup of
tea, how much heat must be added? The specific heat of water is 4.18 J/kg°C. *
Answer:
142428.358 J must be added per kg of water.
Explanation:
because the heat of the water is 4.18 J per kg of water then 75 degrees Celcius is 142,432 J then 142432.53750000108 - 4.18 = 142428.358 J for per kg of water.
What is meant by the phrase "a consistent method of measurement"?
• A. The same person performs all measurements.
• B. Variables are measured using the same method each time.
O C. All measurements are in non-Si units.
• D. You only take one measurement.
SUBMIT
Answer:
B same method
Explanation:
select and explain three features of the solar panel that maximises the final temperature of the water
Answer:
Irradiance (sunlight intensity or power), in Watts per square meter falling on a flat surface. ... Air Mass refers to “thickness” and clarity of the air through which the sunlight passes to reach the modules (sun angle affects this value). ... Cell temperature , which will differ from ambient air temperature