Answer: D: plutonium-239
Explanation: Got it right on the quiz
The table below shows a list of radioisotopes and their half-lives.
A 2-columns table with 10 rows. Column 1 is labeled radioisotope. Column 2 is labeled half-life. Lithium-5, 3 × 10⁻²² seconds; polonium-211, 0.516 seconds; Barium-139, 82.7 minutes; uranium-240, 14.1 hours; Bismuth-210, 5.012 days; uranium 232, 68.9 years; carbon-14, 5730 years; plutonium-239, 24,065 years; beryllium-10, 1.6 × 10⁵ years; uranium-238, 4.5 times 10 to the 9 years.
The radioisotope that has the longest half-life is the best to use in powering planet and space exploration vehicles because they can travel farther. The radioisotope is the best to use is:
d) plutonium-239
Plutonium-239 has the longest half-life of all the radioisotopes listed, at 24,065 years. This means that it will take 24,065 years for half of the plutonium-239 in a sample to decay. This makes it a good choice for powering planet and space exploration vehicles because it will last for a long time.
The other radioisotopes listed have much shorter half-lives. Lithium-5 has a half-life of 3 × 10⁻²² seconds, polonium-211 has a half-life of 0.516 seconds, barium-139 has a half-life of 82.7 minutes, uranium-240 has a half-life of 14.1 hours, bismuth-210 has a half-life of 5.012 days, uranium-232 has a half-life of 68.9 years, carbon-14 has a half-life of 5,730 years, and beryllium-10 has a half-life of 1.6 × 10⁵ years.
So, the best radioisotope to use for powering planet and space exploration vehicles is plutonium-239. It has the longest half-life, which means that it will last for a long time and provide a steady source of power.
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A football player kicks a 0.94 kg football with a force of 2.4 N. Calculate the acceleration of the football as the player kicks the ball. Round your answer to the nearest tenth of a m/s2. The acceleration of the football is ____ m/s2.
Answer:
it's 2.6 just did it the other person is wrong.
Its 2.6 the other guy is right
i did the assignment
Pls 50 points right answer gets brainliest
Explain the meaning of thermal energy transfer and give specific examples of conduction, convection, and radiation.
Answer:
Thermal energy transfer involves the transfer of internal energy. The three types of thermal energy transfer are conduction, convection and radiation. ... Those are both good examples of convection, the movement of warm particles from warmer to cooler locations, Conduction is the transfer of thermal energy through direct contact. Convection is the transfer of thermal energy through the movement of a liquid or gas. Radiation is the transfer of thermal energy through thermal emission.
Explanation:
Hope this helps!
Answer:
thermal energy: the part of total internal energy that can be transferred (a portion of the kinetic energy)
heat is the thermal energy that flows from one substance to another due to a temperature difference.
Thermal energy is measured in temperature change.
Thermal energy transfer stops when thermal equilibrium is achieved (Both substances at the same temperature).
conduction: Transfer of thermal energy through a solid object like heat transferring up a metal spoon from a hot cup of coffee.
convection: the transfer of thermal energy due to the movement of a liquid or gas caused by differences in temperature. Only in a fluid (liquid or gas). Breezes, ocean currents.
radiation: Transfer energy with or without matter. Warming from the Sun, microwave oven.
what is the main function of photosynthesis
Answer:
to provide food to the plant also known as glucose
Someone help please ...
Answer:
Yes
Explanation:
A trait in which one allele for a gene contributes and the phenotype is an intermediate between the dominante
and recessive is what type of trait?
Identify the gas from it calculated molar mass. P = 103.2 kPa V = 225 mL T = 25.00 *C m= 0.375 g N2 Ar CO2 Kr O2 H2 Og Xe H2O He Ne
Answer:
Not sure yet but I will get back
Explanation:
Can someone plz help me with this one problem plz
(I’m marking brainliest)!!!!
Answer:
the best answer is c because when there is more ppl there are less resources
Hello, can anyone help me with this question?
Answer: a. [tex]11.9\times 10^{23}atoms[/tex] of carbon
b. [tex]35.7\times 10^{23}atoms[/tex] of hydrogen
c. [tex]5.96\times 10^{23}atoms[/tex] of oxygen
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar Mass}}=\frac{45.6g}{46.07g/mol}=0.989moles[/tex]
a) 1 mole of ethanol [tex](C_2H_5OH)[/tex] contains = [tex]2\times 6.023\times 10^{23}=12.05\times 10^{23}atoms[/tex] of carbon
Thus 0.989 moles ethanol [tex](C_2H_5OH)[/tex] contains = [tex]\frac{12.05\times 10^{23}}{1}\times 0.989=11.9\times 10^{23}atoms[/tex] of carbon
b) 1 mole of ethanol [tex](C_2H_5OH)[/tex] contains = [tex]6\times 6.023\times 10^{23}=36.14\times 10^{23}atoms[/tex] of hydrogen
Thus 0.989 moles ethanol [tex](C_2H_5OH)[/tex] contains = [tex]\frac{36.14\times 10^{23}}{1}\times 0.989=35.7\times 10^{23}atoms[/tex] of hydrogen
c) 1 mole of ethanol [tex](C_2H_5OH)[/tex] contains = [tex]6.023\times 10^{23}atoms[/tex] of oxygen
Thus 0.989 moles ethanol [tex](C_2H_5OH)[/tex] contains = [tex]\frac{6.023\times 10^{23}}{1}\times 0.989=5.96\times 10^{23}atoms[/tex] of oxygen
spheres are not perfect in space. But <> is in the cause of their shape.
Answer:
<> yes
Explanation:
4. How can acids and bases behave in terms of electrolytes/reactivity?
Answer:
Strong acids are strong electrolytes. Such acids ionize completely.
Weak acids and bases are weak electrolytes. Such bases and acids ionize only to a small extent.
Explanation:
Electrolytes are the substances that produce ions when they are dissolved in water. Electrolytes can be categorized as bases, acids, and salts.
Strong acids are strong electrolytes. Such acids ionize completely.
Weak acids and bases are weak electrolytes. Such bases and acids ionize only to a small extent.
A rock sample from the moon includes a mineral that contains small amounts of the radioactive isotope Potassium-40 and its daughter element Argon-40 (half-life of 1.3 billion years). This mineral would not form with any Argon-40. Consider a crystal with 7 atoms of Argon-40 for every 1 atom of Potassium-40. How many atoms of Potassium-40 were present when the crystal formed for each atom of Potassium-40 that exists today
Answer:
There were originally 8 atoms of Potassium-40.
Explanation:
The half-life of a radioactive material is the time taken for half the original material to decay or the time required for a quantity of the radioactive substance to reduce to half of its initial value.
If the original material formed without any Argon-40, it means that the atoms originally present were Potassium-40 atoms.
Presently, there are 7 Argon-40 atoms for every 1 of Potassium-40, we can deduce the number of half-lifes the Potassium-40 has undergone as follows :
After one half-life, (1/2) there will be one Potassium-40 atom for every Argon-40 atom.
After a second half life, 1/2 × 1/2 = 1/4: there will be one Potassium-40 atom for every three atoms of Argon-40.
After a third half-life, 1/4 × 1/2 = 1/8: there will be one Potassium-40 atom for every 7 atoms of Argon-40.
Since there are 1/8 atoms of Potassium-40 presently, there were originally 8 atoms of Potassium-40.
SOMEONE hELP ASAP
Which of the following statements about humans and biodiversity are TRUE?
Choose all that apply:
Humans benefit from biodiversity as a source of food, medicine, and raw materials.
Biodiverse ecosystems provide benefits to humans, such as cleaning water or pollination of crops.
Humans benefit from biodiversity but do not rely on biodiversity. Any natural materials that run out can be replaced by synthetic materials.
Humans are not affected by loss of biodiversity.
Answer:
Iiiiiiddddddkkkkkkkkkk
Explanation:
Answer:
second onw\e
Explanation:
NEED HELP QUICK PLS! :)
A Jeweler is making sapphire rings using 2 sapphires on every 1 ring. If the jeweler has 12 sapphires and 10 rings, what is the theoretical yield? (3 points)
O 5 sapphire rings
O 6 sapphire rings
O 10 sapphire rings
O 12 sapphire rings
3 (05 05 LC)
The theoretical yield is 6 sapphire rings.
What is Theoretical yield?This is the total product formed as a result of the complete conversion of
the reactants. In this scenario, the reactant is the 12 sapphires in which 2
of it is needed to produce one sapphire ring.
This however translates to the theoretical yield being 6 sapphire rings
which is gotten by:
2 sapphires = 1 ring
12 sapphires = x
Cross multiply
2x = 12
x= 12/2 = 6 sapphire rings.
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3) Explain why elements in the same group
similar properties
Answer:
The elements of the same group have the same number of valence electrons, that is why they have similar properties
if a car collides with a barrier and hit with a hundred 50 Newtons of force how much force does the barrier put in the car?
Answer: 50 Newtons
Explanation:
Due to newtons third law of motion for every action there is an equal and opposite reaction or in this case the equal and opposite amount of force applied so the same 50 N is applied on the car by the barrier
Why are the offsprings of asexually reproducing organisms genetically identical to their offspring
Answer:
wdym?
Explanation:
If some methane gas at 115 kPa and 33C is allowed to expand to 15.0dm^3 from 8.00 dm^3 when the temperature changed to 51.2 C. What pressure will the same amount of gas exert?
Answer:
228.4 kPa
Explanation:
From thw question,
PV/T = P'V'/T'..................... Equation 1
Where P = Inital pressure, T = Initial Temperature, V = Initial Volume, P' = fInal Pressure, V' = Final volume, T' = Final Temperature.
Make P' the subject of the equation
P' = PVT'/TV'...................... Equation 2
Given: P = 115 kPa, V = 15.0 dm³, T = 33°C = (33+273) K = 306 K, T' = 51.2°C = 51.2+273 = 324.2 K, V' = 8.00 dm³
Substitute these values into equation 2
P' = (115×15×324.2)/(306×8)
P' = 228.4 kPa.
did anyone do the phase change gizmo ever please give it to me i am not in the mood to try haha
Answer:
I'm going to give it a shot, but I'm not totally sure what you're talking about
LOSPICNOMEWTROS SON INSTRUMENTOS EMPLEADOS PARA CALCULAR DENSIDADES DE SUSTANCIAS LIQUIDAS. SE REALIZO UN EXPERIMENTO PARA DETERMINAR LA DENSIDAD DE UNA SUSTANCIA DESCONOCIDA EN EL LABORATORIO ENCONTRANDO LOS SIGUIENTES VALORES (Picnómetro vacío 8,5g) (Picnómetro lleno 25g) (Capacidad Picnómetro 25mL) . CUAL ES LA DENSIDAD DE LA SOLUCIÓN
Answer:
0.66g/mL
Explanation:
La densidad es una propiedad de la materia definida como la masa de una sustancia en un determinado volumen.
En este problema, podemos hallar la densidad sabiendo que la diferencia de masas del pic vacío y el pic lleno es la masa de la solución y que el volumen que ocupa es de 25mL:
Masa solución:
25g - 8.5g = 16.5g
Así, la densidad será:
16.5g / 25mL =
0.66g/mLTemperature measures _____________.
A. how much heat an object can produce
B. what the weather will be
C. the total energy in an object
D. the average speed of the particles in a material
Answer:
C
Explanation:
Temperature is the amount of energy an object has in it's thermal energy stores
Santee Cooper is stocking lakes Marion and Moultrie with 109,000 sterile grass carp. The grass carp, which eat hydrilla (Invasive species), are the most effective and least Intrusive means to control the weed. What type of control are they using?
A Invasive
B biological
C.chemical
D physical
Answer:
biological
Explanation:
i took the test and got it right
A 55 kg person on Earth has the __________mass on the moon.
Answer:
89.1 N
Explanation:
W = m gm = 55.0 x 1.62 = 89.1 N
Behavioral therapy began with _______________.
A. Ivan Pavlov
B. B.F. Skinner
C. John Watson
D. Erik Erikson
Answer:
B
Explanation:
Behaviour therapy was popularized by the U.S. psychologist B.F. Skinner, who worked with mental patients in a Massachusetts state hospital.
What is concentration of hydrogen ion a given acid if its PH value is 9?
How many moles are present in 29.4g of Aluminum (AI)? *
Answer:
588 mole
29.4
+29.4
5 8. 8g
hydrogen + copper(II) oxide= copper + steam, which substance is oxidized. explain your answers
What is the formula for the Ideal Gas Law and what does each variable represent?
Answer:
PV=nRT
Explanation:
P= Pressure
V= Volume
n= amount of substance (usually moles)
R= Ideal Gas Constant (8.314 J/mol*K
T= Temperature
Identify the element that matches this orbital diagram
Answer:
Nitrogen
Explanation:
The electron configuration of nitrogen is:
1s2 2s2 2p3
which satisfies the diagram.
Why does the spoon handle look broken where it enters the surface of the water?
Answer:
The spoon appears to be broken because of refraction. Refraction happens when light travels from one medium to another and changes speed and bends. This also causes objects to look different sizes and shapes when they are submerged in water.
Explanation:
To solve this, we must know the concept behind refraction. Therefore, due to refraction, the spoon handle look broken where it enters the surface of the water.
What is refraction?Refraction is the bending of a wave as it travels through different media. The two materials' different densities are what lead to the bending. Anytime a light beam enters a material with a differing refractive index at an angle, it refracts. This increase in speed causes a shift in direction.
Due of refraction, the spoon seems to be shattered. When light moves from one medium to another, its speed and direction shift, causing refraction. When items are submerged in water, this also makes them appear to be of varied sizes and forms.
Therefore, due to refraction, the spoon handle look broken where it enters the surface of the water.
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